Microchip-Tech-RN4870-V-RM140

RN4870/71  

Bluetooth

®

Low Energy Module  

Features  

• Qualified

 

for Bluetooth SIG v5.0 Core Specification  

• Certified

 

to FCC, ISED, CE, KCC, NCC and SRRC  

• On-Board

 

Bluetooth Low Energy (BLE) Stack  

• ASCII

 

Command Interface API Over UART  

• Scripting

 

Engine for Hostless Operation  

• Compact

 

Form Factor – The RN4870/71 family  

comes in four different sizes, from 6 mm x 8 mm  

to 12 mm x 22 mm:  

– RN4870:

 

12 mm x 22 mm  

– RN4871:

 

9 mm x 11.5 mm  

– RN4870U:

 

12 mm x 15 mm  

– RN4871U:

 

6 mm x 8 mm  

• Beacon

 

Private Service for Beacon Services  

• UART

 

Transparent Service for Serial Data  

Applications  

• Remote

 

Configuration Over-the-Air  

Operational  

• Operating

 

Voltage: 1.9V to 3.6V (3.3V typical)  

•

T

e

mperature

 

Range:  

– -20°C

 

to +70°C (Normal)  

– -40°C

 

to +85°C (Industrial)  

• Supports

 

UART  

• Up

 

to Three Pulse-Width Modulation (PWM)  

Outputs (only for RN4870)  

Antenna Options  

• Chip

 

Antenna Range based on Open Air  

Measurements and Phone Module Connection:  

RF/Analog Features  

– RN4870:

 

Up to 50m  

– RN4871:

 

Up to 10m  

• ISM

 

Band 2.402 to 2.480 GHz Operation  

• Channels:

 

0-39  

• External

 

Antenna Connection via RF Pad  

(RN4870U/RN4871U)  

• RX

 

Sensitivity: -90 dBm  

• TX

 

Power: 0 dBm  

• RSSI

 

Monitor  

Applications  

MAC/Baseband/Higher Layer Features  

• Health/Medical

 

Devices  

• Sports

 

Activity/Fitness Meters  

• Beacon

 

Applications  

• Secure

 

AES128 Encryption  

• GA

P

,

 

G

ATT, SM, L2CAP and Integrated Public  

Profiles  

• Customer

 

Can Create up to Five Public and Four  

Private Services  

• Software

 

Configurable Role as Peripheral or  

Central and Client or Server  

• Internet

 

of Things (IoT) Sensor

T

a

g  

• Remote

 

Control  

• Wearable

 

Smart Devices and Accessories  

• Smart

 

Energy/Smart Home  

• Industrial

 

Control  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 1  

RN4870/71  

Table of Contents  

1.0 Device Overview ………………………………………………………………………………………………………………………………………………………… 3  

2.0 Specification

s

.

………………………………………………………………………………………………………………………………………………………….. 11  

3.0 Interface Pins …………………………………………………………………………………………………………………………………………………………… 13  

4.0 Physical Dimensions and Attributes…………………………………………………………………………………………………………………………….. 15  

5.0 Application Reference Circuit

s

.

…………………………………………………………………………………………………………………………………… 25  

6.0 ASCII Command API ………………………………………………………………………………………………………………………………………………… 29  

7.0 Supported Services…………………………………………………………………………………………………………………………………………………… 31  

8.0 Antenna Characteristic

s

.

……………………………………………………………………………………………………………………………………………. 33  

9.0 Timing Characteristics……………………………………………………………………………………………………………………………………………….. 35  

10.0 Ordering Information ……………………………………………………………………………………………………………………………………………….. 37  

11.0 Regulatory Approval………………………………………………………………………………………………………………………………………………… 39  

Appendix A: Revision History……………………………………………………………………………………………………………………………………………

46  

The Microchip Website …………………………………………………………………………………………………………………………………………………… 48  

Customer Change Notification Service

 

…………………………………………………………………………………………………………………………….. 48  

Customer Support …………………………………………………………………………………………………………………………………………………………. 48  

Product Identification System ………………………………………………………………………………………………………………………………………….. 50  

TO OUR VALUED CUSTOMERS  

It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip  

products.

T

o

t

his end, we will continue to improve our publications to better suit your needs. Our publications will be refined and  

enhanced as new volumes and updates are introduced.  

If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via  

E-mail at

. We welcome your feedback.  

Most Current Data Sheet  

To

o

btain the most up-to-date version of this data sheet, please register at our Worldwide Website at:  

Y

o

u can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.  

The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).  

Errata  

An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current  

devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision  

of silicon and revision of document to which it applies.  

To

d

etermine if an errata sheet exists for a particular device, please check with one of the following:  

•

•

Microchip’s Worldwide Website;

Y

o

ur local Microchip sales office (see last page)  

When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are  

using.  

Customer Notification System  

Register on our website at

to receive the most current information on all of our products.  

DS50002489G-page 2  



2016-2023 Microchip Technology Inc.  

RN4870/71  

T

a

ble 1-1

shows the various options for packaging and  

features available in the RN4870/71 family.

T

a

ble 1-2  

provides the description of the pin functions for all the  

modules in the RN4870/71 family.

Figure 1-1

through  

Figure 1-4

show the pinouts for the different modules.  

1.0  

1.1  

DEVICE OVERVIEW  

Overview  

The RN4870/71 BLE module integrates Bluetooth 5.0  

baseband controller, on-board Bluetooth stack, digital  

and analog I/Os and RF power amplifier into one  

solution.  

TABLE 1-1:  

RN4870/71 FAMILY  

On-Board  

Number of  

Operating  

Temperature Range  

Part Number

(

1

)  

Shielding  

Dimensions  

Antenna  

Pins  

RN4870-V/RMXXX  

RN4870U-V/RMXXX  

RN4871-V/RMXXX  

RN4871U-V/RMXXX  

RN4870-I/RMXXX  

RN4871-I/RMXXX  

Y

e

s  

No  

Yes  

No  

33  

30  

16  

17  

33  

16  

12 mm x 22 mm  

12 mm x 15 mm  

9 mm x 11.5 mm  

6 mm x 8 mm  

-20°C to +70°C  

-20°C to +70°C  

-20°C to +70°C  

-20°C to +70°C  

-40°C to +85°C  

-40°C to +85°C  

Y

e

s  

No  

Yes  

No  

Yes  

Yes  

Y

e

s  

Y

e

s  

12 mm x 22 mm  

9 mm x 11.5 mm  

Note 1:

 

The last three digits in P/N indicate the firmware version. At the time of publication, the latest firmware  

version is 1.28. Ensure to check the product webpage for the latest part number and firmware version.  

TABLE 1-2:  

PIN DESCRIPTION  

RN4870U RN4870 RN4871U RN4871  

Name  

Type  

Description  

—

—

1

1

2

—

—

12  

11  

10  

—

—

13  

14  

—

GND  

GND  

Power Ground

 

reference.  

Power Ground

 

reference.  

Power Ground

 

reference.  

3

GND  

2

4

VBAT  

BK_IN  

Power Positive

 

supply input. Range: 1.9V ~ 3.6

V

.  

—

—

Power Buck

 

power supply input,  

Can be connected to the VBAT pin,  

Connect to 10 µF low-ESR ceramic capacitor,  

Voltage range: 1.9V to 3.6V.  

3

4

5

6

5

6

7

8

—

—

—

—

—

—

—

—

P2_2  

D I/O

 

GPIO,  

PWM1 (only for RN4870),  

Default: Input; pulled high.  

VDD_IO Power

 

I/O positive supply. Do not connect.  

Ensure VDD_IO and MCU I/O voltage are  

compatible.  

VDD_IO Power

 

I/O positive supply. Do not connect.  

Ensure VDD_IO and MCU I/O voltage are  

compatible.  

ULPC_O Power

 

1.2V ULPC LDO output,  

Used for diagnostic purposes,  

Do not connect

to any pin or device,  

For measurement, connect a bypass 1 µF  

capacitor to ground.  

7

8

9

—

—

—

—

P2_3  

D I/O

 

GPIO,  

PWM2 (only for RN4870),  

Default: Input; pulled high.  

10  

BK_O  

Power 1.55V

 

Buck power supply output for diagnostic  

purpose.  

Do not connect.  

Legend:

Pin Type Abbreviations:

 

A = Analog

 

D = Digital

 

I/O = Input/Output

 

I/p = Input

 

O/p = Output  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 3  

RN4870/71  

TABLE 1-2:  

PIN DESCRIPTION (CONTINUED)  

RN4870U RN4870 RN4871U RN4871  

Name  

Type  

Description  

—

—

13  

6

P1_6  

D

Configurable pin. Refer to

Section 1.2 “Module  

Configuration”

for details. When connected to host  

MCU, set the pin connected to pin P1_6 in either  

high-impedance or drive pin low during firmware  

start-up (approximately 22 msec).  

—

9

—

11  

14  

15  

5

P1_7  

P2_7  

D

Configurable pin. Refer to

Section 1.2 “Module  

Configuration”

for details.  

15  

D O/p

 

UART_TX_IND output pin. Provides indication if  

RN4870 is transmitting to host MCU over UAR

T

.  

Pulled low before UART TX begins and pulled high  

after UART TX is over.  

10  

12  

—

—

P1_1  

D I/O

 

GPIO; default: Input; pulled high,  

A I/p

 

AD9,  

Configured as the BLEDK_STATUS1_IND pin by  

default.  

11  

12  

13  

13  

14  

15  

2

3

8

3

4

P1_2  

P1_3  

P0_0  

D I/O

 

GPIO; default: Input; pulled high,  

A I/p

 

AD10; I

2

C SCL pin.  

D I/O

 

GPIO; default: Input; pulled high,  

AD11; I

2

C SDA pin.  

11  

D I/O

 

GPIO; default: Input; pulled high,  

AD0,  

Configured as the UART_CTS pin by default.  

14  

16  

—

—

P1_0  

D I/O

 

GPIO; default: Input; pulled high,  

AD8,  

Configured as the BLEDK_STATUS2_IND pin by  

default.  

15  

16  

17  

18  

6

9

P3_6  

P2_0  

D I/O

 

GPIO; default: Input; pulled high (only for RN4870),  

Configured as the UART_RTS pin by default.  

16  

16  

D I/p

 

System configuration input;  

1

: Application mode  

0

:

T

e

st mode/Flash update/EEPROM configuration  

Default: Input; pulled high.  

17  

18  

19  

20  

21  

22  

19  

20  

21  

22  

23  

24  

—

—

7

—

—

10  

7

P2_4  

NC  

D I/O

 

GPIO; default: Input; pulled high.  

—

No connection.  

RST_N  

D I/p

 

Module Reset; active-low; Internally pulled high.  

5

UART_RX D

 

I/p UART

 

data input.  

UART_TX D

 

O/p UART

 

data output.  

4

8

—

—

P3_1  

P3_2  

P3_3  

P3_4  

D I/O

 

GPIO; default: Input; pulled high,  

Configured as RSSI_IND pin by default;  

SPI NCS Bus.  

23  

24  

25  

25  

26  

27  

—

—

—

—

—

—

D I/p

 

GPIO; default: Input; pulled high,  

Configured as the LINK_DROP pin by default;  

SPI MISO pin.  

D I/p

 

GPIO; default: Input; pulled high,  

Configured as the UART RX indication pin by default;  

SPI MOSI pin.  

D I/p

 

GPIO; default: Input; pulled high,  

Configured as the PAIRING_KEY pin by default;  

SPI SCLK pin.  

Legend:

Pin Type Abbreviations:

 

A = Analog

 

D = Digital

 

I/O = Input/Output

 

I/p = Input

 

O/p = Output  

DS50002489G-page 4  



2016-2023 Microchip Technology Inc.  

RN4870/71  

TABLE 1-2:  

PIN DESCRIPTION (CONTINUED)  

RN4870U RN4870 RN4871U RN4871  

Name  

Type  

Description  

26  

27  

28  

28  

29  

30  

—

—

9

—

—

12  

P3_5  

D I/O

 

GPIO; default: Input; pulled high,  

A I/p

 

LED1; provides indication whether the module is  

on/off.  

P0_7  

P0_2  

D I/O

 

GPIO; default: Input; pulled high,  

Configured to the LOW_BATTERY_INDICATOR pin  

by default.  

D I/O

 

AD2,  

LED0: Provides indication whether the module is in  

On/Off mode.  

29  

—

30  

31  

32  

—

17  

—

1

2

GND  

GND  

Power Ground

 

reference.  

Power Ground

 

reference.  

—

—

BT_RF  

A I/O

 

External antenna connection (50 Ohms). Only for  

RN4870U and RN4871U. No connection for RN4871.  

—

33  

—

—

GND  

Power Ground

 

reference.  

Legend:

Pin Type Abbreviations:

 

A = Analog

 

D = Digital

 

I/O = Input/Output

 

I/p = Input

 

O/p = Output  

FIGURE 1-1:  

PIN DIAGRAM – RN4870U  

Top View  

Bottom View  

GND  

VBAT  

1

1

2

30 BT_RF  

30  

TP-3 VCC_RF  

TP-1 VCC_PA  

TP-3  

P2_2  

GND  

3

4

5

6

7

8

9

29  

28  

27  

26  

25  

24  

TP-1  

VDD_IO  

VDD_IO  

P0_2/LED  

P0_7  

ULPC_O  

P2_3  

P3_5  

P3_4  

BK_O  

P3_3  

P2_7/TX_IND  

23 P3_2  

TP-2  

TP-2 CLDO_O  

P1_1

10  

P1_2 11  

P1_3 12  

P3_1  

22  

21

UART_TX  

UART_RX  

20  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 5  

RN4870/71  

FIGURE 1-2:  

PIN DIAGRAM – RN4870  

Top View  

Bottom View  

1

2

GND  

GND  

GND  

33  

33  

1

32 GND  

GND  

VBAT  

3

4

5

6

7

8

9

TP-3 VCC_RF  

TP-1 VCC_PA  

TP-3  

P2_2  

31 GND  

TP-1  

VDD_IO  

VDD_IO  

ULPC_O  

P2_3  

30 P0_2/LED  

29 P0_7  

28 P3_5  

27 P3_4  

BK_O 10  

26  

P3_3  

P2_7/TX_IND 11  

P1_1 12  

25 P3_2  

TP-2  

TP-2 CLDO_O  

24 P3_1  

13  

P1_2  

23 UART_TX  

22 UART_RX  

P1_3 14  

FIGURE 1-3:  

PIN DIAGRAM – RN4871U  

Bottom View  

Top View  

1

UART_RX 5  

17  

17 GND  

TP-1  

TP-2 TP-4  

TP-1 CLDO_O  

P3_6  

6

RST_N 7  

P0_0 8  

P2_0  

16  

TP-4 ULPC_O  

TP-5 BK_O  

VCC_RF TP-2  

VCC_PA TP-3  

15 P2_7  

14 P1_7  

TP-5  

9

P0_2  

TP-3  

DS50002489G-page 6  



2016-2023 Microchip Technology Inc.  

RN4870/71  

FIGURE 1-4:  

PIN DIAGRAM – RN4871  

7RSꢉ9LHZ  

%RWWRPꢉ9LHZ  

1&  

ꢃ

16  

ꢃꢄ 3ꢇBꢋ  

ꢃꢁ 3ꢇBꢅ  

ꢃꢀ 9%$7  

ꢃꢂ *1′  

ꢃꢇ 3ꢋBꢇ  

TP-3  

TP-2  

TP-4  

TP-5  

73ꢊꢂꢉ9&&B3$  

73ꢊꢇꢉ9&&B5)  

73ꢊꢀꢉ8/3&B2  

*1′ ꢇ  

3ꢃBꢇ ꢂ  

3ꢃBꢂ ꢀ  

3ꢃBꢅ ꢁ  

%.B2ꢉ73ꢊꢃ  

TP-1  

&/’2B2ꢉ73ꢊꢁ  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 7  

RN4870/71  

T

a

ble 1-5

shows the status of the module as indicated  

by the Status 1 and Status 2 indication pins.

T

a

ble 1-6  

shows the details of test pads that are present on the  

bottom side of the module, used for diagnostic  

purposes during testing.

Figure 1-5

shows all the key  

elements of the module.  

1.2  

Module Configuration  

The GPIO pins of the RN4870 and RN4871 modules  

can be configured for different functions using the  

ASCII command interface.

T

a

ble 1-3

shows the various  

pins in the RN4870/71 module that are available for  

configuration and their default configuration settings.  

T

a

ble 1-4

provides details on each available function.  

TABLE 1-3:  

Pin Name  

P0_7  

CONFIGURABLE PINS AND DEFAULT FUNCTIONS IN THE RN4870 AND RN4871  

Available in  

Default Function  

RN4870  

RN4871  

x

x

—

—

—

—

—

—

—

—

—

—

x

Low Battery Indication  

Status 2  

P1_0  

P1_1  

P2_2  

P2_4  

P3_1  

P3_2  

P3_3  

P3_4  

P3_5  

P1_2  

P1_3  

P1_6  

P1_7  

x

Status 1  

x

None  

x

None  

x

RSSI Indication  

Link Drop  

UART RX Indication  

Pairing Key  

None  

x

x

x

x

x

None  

x

x

None  

—

—

x

UART RX Indication  

None  

x

TABLE 1-4:  

CONFIGURABLE FUNCTIONS AND DESCRIPTIONS  

Function Name  

Description  

Low Battery Indication  

Pin output goes low when the V

DD

is below a specified level.

T

o

s

et the threshold  

level, change the EEPROM settings.  

Status 1  

Use this indication pin along with the Status 2 pin to indicate the current status of  

the module. Refer to

T

a

ble 1-5

for details of the status indication.  

Status 2  

Use this indication pin along with the Status 1 pin to indicate the current status of  

the module. Refer to

T

a

ble 1-5

for details of the status indication.  

RSSI Indication  

Use this indication pin to indicate the quality of the link based on the RSSI level.  

If the RSSI level is lower than the specified threshold value, then the RSSI  

indication pin goes low. Set the threshold for the RSSI link quality in EEPROM.  

Link Drop  

When the RN4870/71 is connected to a remote device, the host MCU can use  

the Link Drop pin to force the module to disconnect the link and enter Shutdown  

state. The pin needs to be pulled low for at least 10 ms.  

UART RX Indication  

Use this pin to enable communication with the UART when the module is in Low-  

Power mode. When

not

in Low-Power mode, the module runs on a 16 MHz  

clock. If Low-Power mode is enabled on the module by using the command,  

SO,1

, the module runs on a 32 kHz clock, thus reducing power consumption.  

However, in Low-Power mode, the host MCU

cannot

communicate with the  

module via the UART since the UART is

not

operational. If the user intends to  

provide data or commands via UART in the Low-Power mode, then the UART  

RX Indication pin must be pulled low and the user needs to wait for at least five  

milliseconds before sending the data. Pulling the UART RX Indication pin low  

allows the module to operate the 16 MHz clock and to enable UAR

T

.  

DS50002489G-page 8  



2016-2023 Microchip Technology Inc.  

RN4870/71  

TABLE 1-4:  

CONFIGURABLE FUNCTIONS AND DESCRIPTIONS (CONTINUED)  

Function Name  

Description  

Pairing Key  

When the RN4870/71 is connected to a remote device, the host MCU can use  

the Pairing Key pin to force the module to disconnect the link and go back to  

Standby state. The pin must be pulled down for at least 160 ms.  

RF Active Indication  

Use this indication pin to indicate that the module is currently performing an  

active transmission and receiving BLE data.  

TABLE 1-5:  

STATUS INDICATION PINS  

Status 1  

Status 2  

State  

High  

High  

Low  

Low  

High  

Low  

Low  

High  

Power-on  

Standby state  

Connection established  

Data session open (Transparent UART)  

TABLE 1-6:  

RN4870U  

TEST POINTS ON THE BOTTOM SIDE  

RN4870  

RN4871U  

RN4871  

Symbol  

Description  

TP-1  

TP-2  

TP-3  

—

TP-1  

TP-2  

TP-3  

—

TP-3  

TP-1  

TP-2  

TP-4  

TP-5  

TP-3  

TP-5  

TP-2  

TP-4  

TP-1  

VCC_PA  

1.55V RF PA LDO  

CLDO_O 1.2V

 

CLDO Output  

VCC_RF  

ULPC_O  

BK_O  

1.2V RF LDO Output  

1.2V ULPC LDO Output  

1.55V Buck Reg Output  

—

—

FIGURE 1-5:  

BLOCK DIAGRAM OF THE RN4870/71  

RN4870/RN4871  

Antenna  

SPI  

Host  

Controller  

(Ext. MCU)  

Matching  

UART  

BT_RF  

8051 (16 MHz)  

®

Bluetooth  

BLE  

2

I C  

Baseband  

32 KB ROM  

and RF  

32 MHz  

Crystal  

IOT  

Peripheral  

Device  

PWM  

24 KB SRAM  

Flash 256 KB  

ADC-12b  

DMA, WD

T

,  

NMI, IRQ  

Event  

Counter  

PMU/MM  

Peripherals  

Band Gap  

AES 128  

MCU  

T

e

mp.  

Sensor  

LDOs  

512B  

Ret-RAM  

32 kHz  

ROSC  

POR  

RTC  

VBAT  

BAT  

DC-DC  

Detect  

Converter  

GPIO PORT  

0 ~ 3  

LDO  

*

Always On (AON)  

*GPIO Pad on Module  

MCU/GPIO/LED  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 9  

RN4870/71  

NOTES:  

DS50002489G-page 10  



2016-2023 Microchip Technology Inc.  

RN4870/71  

2.0  

SPECIFICATIONS  

T

a

ble 2-1

 

provides the general specifications for the  

module.

T

a

ble 2-2

,

T

a

ble 2-3

and

T

a

ble 2-4

provide the  

electrical characteristics and the current consumption  

of the module.  

TABLE 2-1:  

GENERAL SPECIFICATIONS  

Specification  

Description  

Standard Compliance  

Bluetooth

®

5.0  

Frequency Band  

2.402 to 2.480 GHz  

GFSK  

Modulation Method  

Maximum Data Rate (Transparent UART)  

10 kbps (iOS

®

9)  

Antenna  

Ceramic  

Interface  

UAR

T

,

A

IO, PIO  

1.9V to 3.6V  

-90 dBm  

Operating Range  

Sensitivity  

RF TX Power  

0 dBm  

Operating

T

e

mperature Range for RN4870-I and RN4871-I Modules  

Operating

T

e

mperature Range for RN4870-V and RN4871-V Modules  

Storage

T

e

mperature Range  

-40°C to +85°C  

-20°C to +70°C  

-40°C to +125°C  

10% to 90%  

10% to 90%  

2

Operating Relative Humidity Range  

Storage Relative Humidity Range  

Moisture Sensitivity Level  

TABLE 2-2:  

ELECTRICAL CHARACTERISTICS  

Parameter  

Min.  

Typ.  

Max.  

Units  

Supply Voltage (V

DD

)  

I/O Voltage Levels  

1.9  

—

3.6  

V

V

IL

Input Logic Levels Low  

V

IH

Input Logic Levels High  

V

OL

Output Logic Levels Low  

V

OH

Output Logic Levels High  

Reset  

V

SS  

0.7 V

DD  

V

SS  

—

—

—

—

0.3 V

DD  

V

DD  

V

V

V

V

0.2 V

DD  

V

DD  

0.8 V

DD  

Reset Low Duration  

63  

—

—

ns  

Input and Tri-State Current with  

Pull-up Resistance  

34  

29  

48  

47  

74  

86  

k



 

k

  

Pull-Down Resistance  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 11  

RN4870/71  

(

1

)  

TABLE 2-3:  

CURRENT CONSUMPTION  

Parameter  

Min.  

Typ.  

Max.  

Units  

Supply Current  

TX Mode Peak Current at V

DD

= 3V, TX = 0 dBm, Buck Mode  

RX Mode Peak Current at V

DD

= 3V, Buck Mode  

Low-Power Mode Current

(

2

)  

—

—

—

1

10 at +25°C

 

13 at +75°C/+85°C  

10 at +25°C

 

13 at +75°C/+85°C  

mA  

mA  

µA  

60 at +25°C  

—

—

Shutdown Low-Power Mode  

2.9  

µA  

Note 1:

 

The current measurements are characterized across a sample of the RN4870/71 module at room  

temperature (+25°C), unless otherwise noted.  

2:

For more details on Low-Power mode, refer to the

“RN4870/71 Bluetooth

®

Low Energy Module User’s  

Guide”

(DS50002466).  

TABLE 2-4:  

CURRENT CONSUMPTION DURING APPLICATION MODE  

Interval  

Test Mode  

Average Current Consumption  

(ms)  

20  

50  

1.061 mA  

505 µA  

298 µA  

113 µA  

89 µA  

Advertising

(

1

,

2

,

3

)  

100  

500  

1000  

18.75  

50  

2.23 mA  

2.13 mA  

2.10 mA  

83 µA  

Connected

(

1

,

2

,

4

)  

100  

500  

1000  

80 µA  

Note 1:

 

These measurements are done at an operating temperature of +25°C at 3.3V and are characterized  

across a sample of the RN4870/71 module.  

2:

Measurements taken with Version 1.18 firmware loaded onto the module.  

3:

The advertising packet data payload is approximately 15 bytes in length.  

4:

The amount of data being transmitted between two peer devices can affect the average current measured.  

The average current measurements are done with only the necessary Bluetooth

®

packets being  

exchanged to keep the connection active at the stated interval.  

DS50002489G-page 12  



2016-2023 Microchip Technology Inc.  

RN4870/71  

Figure 3-1

also shows the basic UART connections to  

the host MCU.  

3.0  

INTERFACE PINS  

Figure 3-1

 

shows the power scheme using a 3.3V  

low-dropout regulator to the RN487X and a host MCU.  

This scheme ensures that the same voltage is used for  

both the module and the MCU.  

Figure 3-2

 

shows the recommended connections for  

running the RN4870/71 on a coin cell battery.  

FIGURE 3-1:  

POWER SCHEME  

RN4870/71/70U  

Reset IC  

Note 1:

 

Ensure VDD_IO and MCU V

DD

voltages are compatible.  

2:

Control and Indication ports are configurable.  

3:

T

o

i

mplement low-power operation, enable the UART_RX_IND  

pin and connect to ground.  

System Configurator  

RN4871U  

Reset IC  

Reset  

Note 1:

 

Ensure VDD_IO and MCU V

DD

voltages are compatible.  

2:

Control and Indication ports are configurable.  

3:

10 µF (X5R) and 330 Ohm resistor are required for RN487X.  

4:

BK_IN connects to VBAT for RN4871U.  

System Configurator  

5:

T

o

i

mplement low-power operation, enable the UART_RX_IND  

pin and connect to ground.  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 13  

RN4870/71  

FIGURE 3-2:  

RN4870/71 COIN CELL POWER SCHEME  

RN4870/71  

Reset IC  

Reset  

Note 1:

 

Application includes ADC, PWM (RN4870) and I

2

C bus interface.  

2:

BK_IN connection is needed only for RN4871U.  

3:

T

o

i

mplement low-power operation, enable the UART_RX_IND pin and connect to ground.  

The Configuration pins on the RN4870 can also be  

configured through a Windows

®

based User Interface  

(UI) configuration tool, BLEDK3.  

DS50002489G-page 14  



2016-2023 Microchip Technology Inc.  

RN4870/71  

areas under the antenna must

not

contain any top,  

inner layer or bottom copper, as shown in

Figure 4-3

. A  

low-impedance ground plane ensures the best radio  

performance (best range, lowest noise).

Figure 4-3  

also shows a minimum ground plane area to the left  

and right side of the module for best antenna  

performance. The ground plane can be extended  

beyond the minimum recommended as required for  

host PCB EMC noise reduction. For best range  

performance, keep all external metal at least 30 mm  

away from the ceramic chip antenna.  

4.0  

4.1  

PHYSICAL DIMENSIONS AND  

ATTRIBUTES  

RN4870 Module  

Figure 4-1

shows the physical dimensions of the RN4870  

module.

Figure 4-2

 

illustrates the recommended PCB  

layout and

Figure 4-3

 

shows the recommended  

mounting details.  

Ensure that there is

no

top copper layer near the test  

pin area, indicated by the shaded

keep out areas

, as  

shown in

Figure 4-2

. When laying out the host PCB, the  

FIGURE 4-1:  

RN4870 MODULE DIMENSIONS  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 15  

RN4870/71  

FIGURE 4-2:  

RN4870 RECOMMENDED PCB FOOTPRINT  

FIGURE 4-3:  

RECOMMENDED MOUNTING DETAILS  

DS50002489G-page 16  



2016-2023 Microchip Technology Inc.  

RN4870/71  

external antenna, such as a PCB trace antenna, a com-  

ponent (chip) antenna or through a host PCB 50 Ohm  

microstrip trace. This trace can be extended to include  

passive parts for antenna attenuation padding,  

impedance matching or to provide test posts. It is recom-  

mended that the microstrip trace be as short as possible  

for minimum loss and best impedance matching. If the  

microstrip trace is longer, a 50 Ohm impedance is  

recommended.  

4.2  

RN4870U Module  

Figure 4-4

 

shows the physical dimensions of the  

RN4870U module.

Figure 4-5

 

illustrates the  

recommended PCB layout and

Figure 4-6

shows the  

recommended mounting details.  

A low-impedance ground plane ensures the best radio  

performance (best range, lowest noise). Pin 30 (BT_RF)  

is a 50 Ohm connection that can be connected to an  

FIGURE 4-4:  

RN4870U MODULE DIMENSIONS  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 17  

RN4870/71  

FIGURE 4-5:  

RN4870U RECOMMENDED PCB FOOTPRINT  

FIGURE 4-6:  

RN4870U RECOMMENDED PCB MOUNTING  

DS50002489G-page 18  



2016-2023 Microchip Technology Inc.  

RN4870/71  

inner layer or bottom copper, as shown in

Figure 4-9

. A  

low-impedance ground plane ensures the best radio  

performance (best range, lowest noise).

Figure 4-9  

also shows a space area around the antenna section  

for best antenna performance. The ground plane can  

be extended beyond the minimum recommended as  

required for host PCB EMC noise reduction. For best  

range performance, keep all external metal at least  

30 mm away from the ceramic chip antenna.  

4.3  

RN4871 Module  

Figure 4-7

shows the physical dimensions of the RN4871  

module.

Figure 4-8

 

illustrates the recommended PCB  

layout and

Figure 4-9

 

shows the recommended  

mounting details.  

Ensure that there is

no

top copper layer near the test  

pin area, indicated by the shaded

keep out areas

, as  

shown in

Figure 4-8

. When laying out the host PCB, the  

areas under the antenna must

not

contain any top,  

FIGURE 4-7:  

RN4871 MODULE DIMENSIONS  

Bottom View  

Top View

 

Side View  

11.5  

11.5  

11.14  

9.54  

Shield  

mounting hole  

7.5  

6.7  

7.5  

6.7  

7.18  

6.7  

16  

1

16  

TP-3  

TP-2  

TP-4  

TP-5  

TP-3  

TP-2  

TP-4  

TP-5  

6.01  

4.85  

5.5  

4.3  

3.1  

1.9  

5.5  

4.3  

3.1  

1.9  

4.75  

4.11  

3.68  

TP-1  

TP-1  

1.2  

2.38  

0.0  

Shield  

mounting  

0.70  

0.00  

hole  

0.0  

0.0  

Shield  

mounting hole  

Test Point Positions  

Pad Positions  

1.0  

Dimensions are in millimeters

ꢀ

 

Tolerances:  

0.7  

0.5  

0.7  

PCB

7KLFNQHVV

: +/-0.06mm  

Pad Detail  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 19  

RN4870/71  

FIGURE 4-8:  

RN4871 RECOMMENDED PCB FOOTPRINT  

Top View  

11.5  

Keep Out Area  

0.5  

1.5  

7.0  

7.5  

6.7  

5.5  

4.6  

4.3  

0.7  

3.1  

1.9  

1.2  

1.5  

Keep Out Area  

0.0  

Dimensions are in millimeters  

FIGURE 4-9:  

RN4871 RECOMMENDED PCB MOUNTING SUGGESTION  

DS50002489G-page 20  



2016-2023 Microchip Technology Inc.  

RN4870/71  

A low-impedance ground plane ensures the best radio  

performance (best range, lowest noise). Pin 1 (BT_RF)  

is a 50 Ohm connection that can be connected to an  

external antenna, such as a PCB trace antenna, a  

component (chip) antenna or through a host PCB  

50 Ohm microstrip trace. This trace can be extended to  

include passive parts for antenna attenuation padding,  

impedance matching or to provide test posts. It is  

recommended that the microstrip trace to be as short  

as possible for minimum loss and best impedance  

matching. If the microstrip trace is longer, a 50 Ohm  

impedance is recommended.  

4.4  

RN4871U Module  

Figure 4-10

 

shows the physical dimensions of the  

RN4871U module.

Figure 4-11

 

illustrates the recom-  

mended PCB layout. It is highly recommended to lay  

out the host PCB as suggested in

Figure 4-12

.  

Figure 4-13

 

shows the recommended placement for  

the module on the host PCB board. For optimal  

transmission and reception sensitivity, place the  

module at the edge of the board.  

FIGURE 4-10:  

RN4871U MODULE DIMENSIONS  

Side View  

Top View  

Bottom View  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 21  

RN4870/71  

FIGURE 4-11:  

RN4871U RECOMMENDED PCB FOOTPRINT  

FIGURE 4-12:  

RN4871U RECOMMENDED PCB MOUNTING  

DS50002489G-page 22  



2016-2023 Microchip Technology Inc.  

RN4870/71  

FIGURE 4-13:  

RECOMMENDATIONS FOR PLACEMENT OF THE MODULE ON HOST PCB BOARD  

Best  

Acceptable  

Acceptable  

Lowest  

Performance  

4.5  

Soldering Recommendations  

The RN4870/71 Bluetooth module is assembled using  

standard lead-free reflow profile, IPC/JEDEC J-STD-020.  

The module can be soldered to the host PCB using  

standard leaded and lead-free solder reflow profiles.  

To

a

void damaging the module, the following  

recommendations are given:  

• Microchip

 

T

e

chnology Application Note,

AN233  

“Solder Reflow Recommendation”

(DS00233)  

provides solder reflow recommendations  

• Do

 

not

exceed Peak

T

e

mperature (T

P

) of 250°C  

• Refer

 

to the solder paste data sheet for specific  

reflow profile recommendations  

• Use

 

no-clean flux solder paste  

• Do

 

not

wash as moisture can be trapped under  

the shield  

• Use

 

only one flow; if the PCB requires multiple  

flows, apply the module on the final flow  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 23  

RN4870/71  

NOTES:  

DS50002489G-page 24  



2016-2023 Microchip Technology Inc.  

RN4870/71  

5.2  

Reference Circuit  

5.0  

5.1  

APPLICATION REFERENCE  

CIRCUITS  

Figure 5-2

 

through

Figure 5-5

 

show the reference  

circuits for various modules under the RN4870/71 family.  

In the circuits, the power input range is 1.9V ~ 3.6V. A  

battery reverse protection circuit is recommended in  

case a battery power input is used. Note that the  

VDD_IO is the same as the power input. In case of an  

LED connection, the power input must be greater than  

3.0

V

.

F

or the RN4870U, an RF antenna matching circuit  

must also be included, as shown in

Figure 5-3

.  

External Configuration and  

Programming  

The RN4870/71 module can be configured and firm-  

ware programmed using an external configuration and  

programming tool.

Figure 5-1

 

shows the mandatory  

connections required between the module and the  

external programming header. It is recommended to  

include these pin connections on the host PCB for  

development. For accessing the various configuration  

and indication pins, use

T

a

ble 1-2

,

T

a

ble 1-3

,

T

a

ble 1-4  

and

T

a

ble 1-5

.  

FIGURE 5-1:  

EXTERNAL PROGRAMMING HEADER CONFIGURATIONS  

RN4870/71  

1

1

1

1

1

P2_0  

VBAT  

RXD  

TXD  

P2_0  

VBAT  

RXD  

TXD  

GND  

GND  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 25  

RN4870/71  

FIGURE 5-2:  

RN4870 REFERENCE CIRCUIT  

1

2

33  

32  

GND  

GND  

GND  

GND  

Reverse Voltage Protection  

Power Input  

Q1  

GND  

J1  

1

VCC  

C1  

GND  

STS2301  

3

4

5

6

7

LED Option  

GND  

VBAT  

P2_2  

VDD_IO  

VDD_IO  

ULPC_O  

P2_3  

BK_O  

P2_7/TX_IND  

P1_1  

VCC  

LD1  

2

P2_2  

31  

30  

29  

28  

27  

26  

25  

24  

23  

22  

GND  

P0_2  

P0_7  

P3_5  

P3_4  

P3_3  

P3_2  

P3_1  

R1  

U1  

RN4870  

P0_2  

P0_7  

P3_5  

P3_4  

P3_3  

P3_2  

P3_1  

P0_2  

330  

8

9

P2_3  

GND  

GND  

GND  

10

ȝ

F

6

.3

V

X

5R  

10  

11  

12  

13  

14  

P2_7  

P1_1  

P1_2  

P1_3  

Configurable I/O  

P0_0  

P2_4  

P2_7  

P3_1  

P3_2  

P3_3  

P3_4  

P3_5  

P3_6  

UART_TX  

UART_RX  

UART Interface  

P0_7  

P1_0  

P1_1  

P1_2  

P1_3  

P2_2  

P2_3  

P1_2/SCL  

P1_3/SDA  

UART_TX  

UART_RX  

Configuration Interface  

P2_0  

J2  

VCC  

VCC  

1

2

3

4

5

R2  

UART_RX  

UART_TX  

4.7k  

P2_0  

Low  

MODE  

U2  

VCC  

RST  

Test Mode  

APP Mode  

1

V

OUT  

VDD  

V

SS  

MCP111-195  

3

2

GND  

High  

FIGURE 5-3:  

RN4870U REFERENCE CIRCUIT  

ANT1  

Antenna Matching  

Reverse Voltage Protection  

Power Input  

L1  

Q1  

1

n

H  

C3  

C4  

J1  

1

VCC  

C1  

GND  

STS2301  

1

2

3

4

5

6

7

8

9

30  

GND  

VBAT  

P2_2  

VDD_IO  

VDD_IO  

ULPC_O  

P2_3  

BK_O  

P2_7/TX_IND  

P1_1  

BT_RF  

2

P2_2  

29  

28  

27  

26  

25  

24  

23  

22  

21  

20  

GND  

P0_2  

P0_7  

P3_5  

P3_4  

P3_3  

P3_2  

P3_1  

U1  

RN4870U  

P0_2  

P0_7  

P3_5  

P3_4  

P3_3  

P3_2  

P3_1  

UART_TX  

UART_RX  

GND  

GND  

P2_3  

GND  

GND  

GND  

10

ȝ

F

6

.3

V

X

5R  

LED Option  

VCC  

P2_7  

P1_1  

P1_2  

P1_3  

LD1  

10  

11  

12  

R1  

P0_2  

P1_2/SCL  

P1_3/SDA  

UART_TX  

UART_RX  

330  

Configuration Interface  

P2_0  

UART Interface  

Configurable I/O  

J2  

VCC  

P0_0  

P2_4  

P2_7  

P3_1  

P3_2  

P3_3  

P3_4  

P3_5  

P3_6  

VCC  

1

2

3

4

5

P0_7  

P1_0  

P1_1  

P1_2  

P1_3  

P2_2  

P2_3  

R2  

UART_RX  

UART_TX  

4.7k  

P2_0  

Low  

MODE  

U2  

VCC  

3

Test Mode  

APP Mode  

RST  

1

V

OUT  

VDD  

V

SS  

MCP111-195  

GND  

2

High  

DS50002489G-page 26  



2016-2023 Microchip Technology Inc.  

RN4870/71  

FIGURE 5-4:  

RN4871 REFERENCE CIRCUIT  

Configuration Interface  

P2_0  

J2  

GND  

VCC  

1

2

3

4

5

Reverse Voltage Protection  

Power Input  

UART_RX  

UART_TX  

Q1  

P1_7  

P1_6  

UART_RX  

UART_TX  

5

6

7

8

16  

15  

14  

13  

P2_0  

P2_7  

P1_7  

P1_6  

UART_RX  

UART_TX  

P2_0  

P2_7  

VBAT  

GND  

VCC  

U1  

RN4871  

J1  

STS2301  

1

2

C1  

GND  

UART Interface  

VCC  

R2  

GND  

GND  

GND  

GND  

4.7k  

Configurable I/O  

10 μF

 

6.3V X5R  

P0_0  

P0_2  

P1_2  

P1_3  

P1_6  

P1_7  

P2_0  

P2_7  

P3_6  

U2  

P2_0  

Low  

MODE  

VCC  

1

RST  

V

OUT  

3

VCC  

LED Option  

VDD  

Test Mode  

APP Mode  

2

LD1  

V

SS  

MCP111-195  

R1  

P0_2  

High  

330  

FIGURE 5-5:  

RN4871U REFERENCE CIRCUIT  

VCC  

R2  

VCC  

Configuration Interface  

4.7k  

LED Option  

P2_0  

Low  

MODE  

P2_0  

LD1  

J2  

Test Mode  

APP Mode  

R1  

U2  

VCC  

P0_2  

1

2

3

4

5

VCC  

RST  

1

2

V

OUT  

330  

3

High  

VDD  

UART_RX  

UART_TX  

V

SS  

MCP111-195  

Reverse Voltage Protection  

Power Input  

Q1  

UART_RX  

UART_TX  

J1  

VCC  

C1  

STS2301  

GND  

1

2

UART Interface  

10  

11  

12  

13  

4

3

2

1

BK_I  

VBAT  

GND  

P1_6  

UART_TX  

P1_3  

P1_2  

BT_RF  

U1  

P1_3  

P1_2  

RN4871U  

GND  

GND  

GND  

10 μF

 

6.3V X5R  

ANT1  

Antenna Matching  

GND  

L1  

Configurable I/O  

P1_6  

1nH  

C3  

C4  

P0_0  

P1_7  

P2_0  

P2_7  

P3_6  

P0_2  

P1_2  

P1_3  

P1_6  

GND  

GND  

GND  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 27  

RN4870/71  

of a Reset IC, which acts as an

Open-Drain

with a Delay  

≤

10 ms, and is triggered at a 1.8V power supply.  

5.3  

Power Drop Protection  

To

p

revent any problems that may arise when the power  

supply goes below 1.9V, a power supply drop protection  

circuit is recommended. Essentially, this circuit consists  

Figure 5-6

 

shows  

protection circuit.  

a recommended power drop  

FIGURE 5-6:  

POWER DROP PROTECTION CIRCUIT  

VBAT  

RN4870/71  

Reset IC  

OUT  

VDD  

RST_N  

DS50002489G-page 28  



2016-2023 Microchip Technology Inc.  

RN4870/71  

• GATT

 

Services  

6.0  

ASCII COMMAND API  

– Create/delete

 

public services/characteristics  

– Read/write

 

characteristic values  

– Set

 

notification for characteristics  

• GAP

 

Role  

The RN4870/71 command Application Programming  

Interfaces (APIs) are documented in the

“RN4870/71  

Bluetooth

®

Low Energy Module User’s Guide”  

(DS50002466).  

– Central,

 

Peripheral, Observer and  

Broadcaster  

The following are the available command options and  

their categories:  

• Advertising  

• Connection  

– Start/stop  

– Establish

 

connection  

– Disconnect  

– Set

 

custom advertisement content  

– Set

 

scan response content  

– Set

 

beacon content  

– Bond/unbond

 

current connection  

– Start/stop

 

scan for other devices  

– Add/delete

 

peer devices to white list  

– Read

 

RSSI values  

– Stop

 

connection process  

• I/O  

• Private

 

Service  

– Create/delete

 

private services/characteristics  

– Read/write

 

characteristic values  

– Set

 

notification for characteristics  

• Transparent

 

UART  

– Read/write

 

I

2

C  

– Enable/disable  

– Change

 

settings in the EEPROM  

– Configure

 

pin functions  

– Configure

 

GPIO mask  

– Set/get

 

GPIO states  

– Read

 

and write analog data  

– PWM

 

control (only for RN4870)  

• System  

– Peripheral

 

side configuration  

– Central

 

side configuration  

• Remote

 

configuration of the module  

• Read

 

individual device information or profile  

settings  

– Reboot  

– Factory

 

default  

– Enter

 

and Exit Command mode  

– Enter

 

Low-Power mode  

• Scripting  

– Enter

 

Script mode  

– Declare

 

event handler  

– Execute

 

current script  

– List

 

current script  

– Clear

 

script  

– Define

 

user function  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 29  

RN4870/71  

NOTES:  

DS50002489G-page 30  



2016-2023 Microchip Technology Inc.  

RN4870/71  

Private services are

not

registered with the Bluetooth  

SIG, and therefore,

not

inter-operable with other  

Bluetooth Low Energy devices unless the device  

implements the private service. An example of a built-  

in private service is the Transparent UAR

T

.

F

or an  

example on how to create a custom service using the  

RN4870, refer to

“RN4870/71 Bluetooth

®

Low Energy  

Module User’s Guide”

(DS50002466).  

7.0  

SUPPORTED SERVICES  

The RN4870 supports two built-in GATT services:  

• Device

 

information public service  

• UART

 

transparent private service, which handles  

data streaming function  

In addition to the above predefined private services, the  

RN4870 provides the ability to create private services.  

If the services are supported on both end points of a  

Bluetooth Low Energy connection, such as Central and  

Peripheral devices, data can be exchanged. For  

example, two RN4870 modules can define a custom  

(private) service with their own unique characteristics.  

Data can be exchanged easily via Command API.  

RN4870 allows custom-defined services for up to five  

public and four private services. Each custom-defined  

service allows up to eight custom-defined characteris-  

tics. All service definitions are saved in on-board  

Nonvolatile Memory (NVM), where the user must set up  

the module only once.  



2016-202G Microchip Technology Inc.  

DS50002489G-page 31  

RN4870/71  

NOTES:  

DS50002489G-page 32  



2016-202G Microchip Technology Inc.  

RN4870/71  

8.0  

ANTENNA CHARACTERISTICS  

The RN4870 and RN4871 modules contain an integral  

ceramic chip antenna.

Figure 8-1

and

Figure 8-2

show  

the antenna performance on the modules.  

FIGURE 8-1:  

RN4870 ANTENNA PERFORMANCE  

Parameter  

Values  

Frequency  

Max Gain  

Efficiency  

2450 MHz  

1.63 dBi  

71.55%  

Antenna Description  

Manufacturer Part Number  

Manufacturer  

Yageo Corporation  

ANT ANT3216A063R2400A  

PIFA 2.4GHz L3 2W1.6  

ANT3216A063R2400A  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 33  

RN4870/71  

FIGURE 8-2:  

RN4871 ANTENNA PERFORMANCE  

Parameter  

Values  

Frequency  

Max Gain  

Efficiency  

2442 MHz  

0.1 dBi  

42.7%  

Antenna Description  

Manufacturer Part Number  

Manufacturer  

ANT AANT3216LL00R2400A  

PIFA 2.4GHz L3 2W1.6  

ANT3216LL00R2400A  

Yageo Corporation  

DS50002489G-page 34  



2016-2023 Microchip Technology Inc.  

RN4870/71  

when RN4870/71 is ready to talk to the MCU after  

Reset, the module provides a UART response indicat-  

ing that the Reset is complete. For more details, refer  

to the

“RN4870/71 Bluetooth

®

Low Energy Module  

User’s Guide”

(DS50002466).  

9.0  

TIMING CHARACTERISTICS  

Figure 9-1

shows the timing diagram for the RN4870/  

71 module when it is reset in the

T

e

st mode and Appli-  

cation mode.

Figure 9-2

shows the timing diagram for  

the module when it is powered on. In Application mode,  

FIGURE 9-1:  

TIMING DIAGRAM OF RN4870/71 UART READY AFTER RESET (IN TEST AND  

APPLICATION MODE)  

Ext  

Reset  

UART Ready  

for MCU  

1mS  

Test Mode  

Process  

P2_0=0  

UART Ready  

for MCU  

Application  

Mode  

Process  

Status pin/UART  

Report Command  

P2_0=1  

25mS  

46mS  

68mS  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 35  

RN4870/71  

FIGURE 9-2:  

TIMING DIAGRAM OF RN4870/71 UART WHEN POWERED ON (IN TEST AND  

APPLICATION MODE)  

VBAT  

UART Ready  

for MCU  

P2_0=0  

25mS  

Test Mode  

Process  

UART Ready  

for MCU  

Status pin/UART  

Report Command  

P2_0=1  

Application  

Mode  

Process  

46mS  

68mS  

The table below shows the error rate for various UART  

baud rates for the RN4870/71 module. The system  

clock is running at 16 MHz.  

TABLE 9-1:  

ERROR RATE FOR VARIOUS BAUD RATES ON THE RN4870/71  

Set Baud Rate  

Measured Baud Rate  

Error  

921600  

460800  

307200  

230400  

115200  

57600  

38400  

19200  

9600  

941176  

457143  

307692  

231884  

115942  

57971  

38095  

19048  

9524  

-2.12%  

0.79%  

-0.16%  

-0.64%  

-0.64%  

-0.64%  

0.79%  

0.79%  

0.79%  

DS50002489G-page 36  



2016-2023 Microchip Technology Inc.  

RN4870/71  

10.0 ORDERING

 

INFORMATION  

The table below provides ordering information for the  

RN4870/71 module.  

TABLE 10-1:

 

ORDERING INFORMATION  

Operating Temperature  

Range  

Part Number

(

1

)  

Antenna  

Shielding  

Number of Pins  

RN4870-V/RMXXX  

RN4870U-V/RMXXX  

RN4871-V/RMXXX  

RN4871U-V/RMXXX  

RN4870-I/RMXXX  

RN4871-I/RMXXX  

On-Board  

External  

Yes  

No  

33  

30  

16  

17  

33  

16  

-20°C to +70°C  

-20°C to +70°C  

-20°C to +70°C  

-20°C to +70°C  

-40°C to +85°C  

-40°C to +85°C  

On-Board  

External  

Yes  

No  

On-Board  

On-Board  

Yes  

Yes  

Note 1:

 

The last three digits in the P/N indicate the firmware version. At the time of publication, the latest firmware  

version is 1.30. Ensure to check product webpage for the latest part number and firmware version.  

Note:  

Go to

for current pricing and a list of distributors carrying Microchip products.  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 37  

RN4870/71  

NOTES:  

DS50002489G-page 38  



2016-2023 Microchip Technology Inc.  

RN4870/71  

11.1.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

11.0 REGULATORY

 

APPROVAL  

The RN4870 module has received the regulatory  

approval for the following countries:  

The RN4870 module has been labeled with its own  

FCC ID number, and if the FCC ID is not visible when  

the module is installed inside another device, then the  

outside of the finished product into which the module is  

installed must also display a label referring to the  

enclosed module. This exterior label can use wording  

as follows:  

• United

 

States/FCC ID: A8TBM70ABCDEFGH  

• Canada/ISED  

– IC:

 

12246A-BM70BLES1F2  

– HVIN:

 

BM70BLES1F2  

• Europe/CE  

• Japan/MIC:

 

202-SMD069  

For the RN4870 module:  

• Korea/KCC:

 

MSIP-CRM-mcp-BM70BLES1FC2  

•

T

a

iwan/NCC

 

No: CCAN15LP0501T3  

• China/SRRC:

 

CMIIT ID: 2016DJ5729  

Contains Transmitter Module  

FCC ID: A8TBM70ABCDEFGH  

or  

The RN4871 module has received the regulatory  

approval for the following countries:  

Contains FCC ID: A8TBM70ABCDEFGH  

• United

 

States/FCC ID: A8TBM71S2  

• Canada/ISED  

– IC:

 

12246A-BM71S2  

– HVIN:

 

BM71BLES1FC2  

• Europe/CE  

This device complies with Part 15 of the FCC Rules.  

Operation is subject to the following two conditions:  

(1) this device may not cause harmful interference,  

and (2) this device must accept any interference  

received, including interference that may cause  

undesired operation.  

• Japan/MIC:

 

005-101150  

• Korea/KCC:

 

MSIP-CRM-mcp-BM71BLES1FC2  

•

T

a

iwan/NCC

 

No: CCAN16LP0011T7  

• China/SRRC:

 

CMIIT ID: 2016DJ5890  

• Brazil/ANATEL:

 

02699-19-08759  

Due to the limited size of the RN4871, the FCC Identifier  

(FCC ID) is not displayed on the module. Therefore, the  

FCC ID must be placed on the outside of the finished  

product into which the module is installed and must  

also display a label referring to the enclosed module.  

This exterior label can use wording as follows:  

11.1 United

 

States  

For the RN4871 module:  

The RN4870/71 module has received Federal Communi-  

cations Commission (FCC) CFR47

T

e

lecommunications,  

Part 15 Subpart C “Intentional Radiators” single modular  

approval in accordance with Part 15.212 Modular  

Transmitter approval. Single modular transmitter  

approval is defined as a complete RF transmission sub-  

assembly, designed to be incorporated into another  

device, that must demonstrate compliance with FCC rules  

and policies independent of any host. A transmitter with a  

modular grant can be installed in different end-use  

products (referred to as a host, host product or host  

device) by the grantee or other equipment manufacturer,  

then the host product may not require additional testing,  

or equipment authorization for the transmitter function  

provided by that specific module or limited module device.  

Contains Transmitter Module  

FCC ID: A8TBM71S2  

or  

Contains FCC ID: A8TBM71S2  

This device complies with Part 15 of the FCC Rules.  

Operation is subject to the following two conditions:  

(1) this device may not cause harmful interference,  

and (2) this device must accept any interference  

received, including interference that may cause  

undesired operation.  

A host product itself is required to comply with all other  

applicable FCC equipment authorization regulations,  

requirements and equipment functions that are not  

associated with the transmitter module portion. For  

example, compliance must be demonstrated: to regula-  

tions for other transmitter components within a host  

product; to requirements for unintentional radiators  

(Part 15 Subpart B), such as digital devices, computer  

peripherals, radio receivers, etc.; and to additional  

authorization requirements for the non-transmitter  

functions on the transmitter module (i.e., Verification or  

Declaration of Conformity) as appropriate (e.g.,  

Bluetooth and Wi-Fi

®

transmitter modules may also  

contain digital logic functions).  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 39  

RN4870/71  

A user’s manual for the product should include the  

following statement:  

11.1.3  

APPROVED ANTENNAS  

To

m

aintain modular approval in the United States, only  

the antenna types that have been tested shall be used.  

It is permissible to use different antenna, provided it is  

the same antenna type, antenna gain (equal to or less  

than) with similar in-band and out-of band characteristics  

(refer to specification sheet for cutoff frequencies).  

This equipment has been tested and found to comply  

with the limits for a Class B digital device, pursuant to  

Part 15 of the FCC Rules. These limits are designed  

to provide reasonable protection against harmful  

interference in a residential installation. This equip-  

ment generates, uses and can radiate radio  

frequency energy, and if not installed and used in  

accordance with the instructions, may cause harmful  

interference to radio communications. However,  

there is no guarantee that interference will not occur  

in a particular installation. If this equipment does  

cause harmful interference to radio or television  

reception, which can be determined by turning the  

equipment off and on, the user is encouraged to try to  

correct the interference by one or more of the  

following measures:  

For RN4870, the approval is received using the  

antenna listed in

Figure 8-1

.  

For RN4871, the approval is received using the  

antenna listed in

Figure 8-2

.  

11.1.4  

HELPFUL WEBSITES  

Federal Communications Commission (FCC):  

FCC Office of Engineering and

T

e

chnology (OET)  

Laboratory Division Knowledge Database (KDB):  

• Reorient

 

or relocate the receiving antenna.  

• Increase

 

the separation between the equipment  

and receiver.  

11.2 Canada  

• Connect

 

the equipment into an outlet on a circuit  

different from that to which the receiver is  

connected.  

The RN4870/71 module has been certified for use in  

Canada under Innovation, Science and Economic  

Development Canada (ISED, formerly Industry  

Canada) Radio Standards Procedure (RSP) RSP-100,  

Radio Standards Specification (RSS) RSS-247 and  

RSS-Gen. Modular approval permits the installation of  

a module in a host device without the need to recertify  

the device.  

• Consult

 

the dealer or an experienced radio/TV  

technician for help.  

Additional information on labeling and user information  

requirements for Part 15 devices can be found in KDB  

Publication 784748, available at the FCC Office of  

Engineering and

T

e

chnology (OET) Laboratory  

Division Knowledge Database (KDB):  

11.2.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

.  

Labeling requirements for the host product (from  

RSP-100, Issue 12, Section 5): The host product shall  

be properly labeled to identify the module within the  

host device.  

11.1.2  

RF EXPOSURE  

All transmitters regulated by FCC must comply with RF  

exposure requirements. KDB Publication 447498  

General RF Exposure Guidance provides guidance in  

determining whether proposed or existing transmitting  

facilities, operations or devices comply with limits for  

human exposure to Radio Frequency (RF) fields adopted  

by the Federal Communications Commission (FCC).  

On the RN4871, due to the limited module size, the IC  

identifier is displayed in the data sheet only and it  

cannot be displayed on the module label.  

The Innovation, Science and Economic Development  

Canada certification label of a module shall be clearly  

visible at all times when installed in the host device;  

otherwise, the host device must be labeled to display  

the Innovation, Science and Economic Development  

Canada certification number of the module, preceded  

by the word, “Contains”, or similar wording expressing  

the same meaning, as follows:  

Output power listed is conducted. This grant is valid  

only when the module is sold to OEM integrators and  

must be installed by the OEM or OEM integrators. This  

transmitter is restricted for use with the specific  

antenna(s) tested in this application for Certification  

and must not be co-located or operating in conjunction  

with any other antenna or transmitters within a host  

device, except in accordance with FCC multitransmitter  

product procedures. This module is approved for  

installation into mobile or/and portable host platforms.  

For the RN4870 module:  

Contains IC: 12246A-BM70BLES1F2  

For the RN4871 module:  

Contains IC: 12246A-BM71S2  

DS50002489G-page 40  



2016-2023 Microchip Technology Inc.  

RN4870/71  

User Manual Notice for License-Exempt Radio Appara-  

tus (from Section 8.4, RSS-Gen, Issue 5, March 2019):  

User manuals for license-exempt radio apparatus shall  

contain the following or equivalent notice in a conspic-  

uous location in the user manual or alternatively, on the  

device or both:  

11.2.2  

RF EXPOSURE  

All transmitters regulated by the Innovation, Science and  

Economic Development Canada (ISED) must comply  

with RF exposure requirements listed in RSS-102 – Radio  

Frequency (RF) Exposure Compliance of Radio  

Communication Apparatus (all frequency bands).  

This device contains license-exempt transmit-  

ter(s)/receiver(s) that comply with Innovation,  

Science and Economic Development Canada’s  

license-exempt RSS(s). Operation is subject to  

the following two conditions:  

This transmitter is restricted for use with a specific  

antenna tested in this application for certification, and  

must not be co-located or operating in conjunction with  

any other antenna or transmitters within a host device,  

except in accordance with Innovation, Science and  

Economic Development Canada multitransmitter  

guidelines.  

1. This

 

device may not cause interference.  

2. This

 

device must accept any interference,  

including interference that may cause  

undesired operation of the device.  

The installation of the transmitter must ensure compliance  

is demonstrated according to the ISED SAR procedures.  

L’émetteur/récepteur exempt de licence contenu  

dans le présent appareil est conforme aux  

CNR d’Innovation,

 

Sciences et Développement  

économique Canada applicables aux appareils  

radio exempts de licence. L’exploitation est  

autorisée aux deux conditions suivantes:  

11.2.3  

APPROVED ANTENNAS  

For RN4870, the approval is received using the  

antenna listed in

Figure 8-1

.  

For RN4871, the approval is received using the  

antenna listed in

Figure 8-2

.  

1. L’appareil

 

ne doit pas produire de brouillage.  

11.2.4  

HELPFUL WEBSITES  

2. L’appareil

 

doit accepter tout brouillage  

radioélectrique subi, même si le brouillage  

est susceptible d’en compromettre le  

fonctionnement.  

.  

11.3 Europe  

Transmitter Antenna

 

(from Section 6.8 RSS-GEN,  

Issue 5,

 

March 2019): User manuals for transmitters  

shall display the following notice in a conspicuous  

location:  

The RN4870/4871 module is Radio Equipment  

Directive (RED) assessed, CE marked, and has been  

manufactured and tested with the intention of being  

integrated into a final product.  

This radio transmitter [IC: 12246A-BM70BLES1F2  

and IC: 12246A-BM71S2] has been approved by  

Innovation, Science and Economic Development  

Canada to operate with the antenna types listed  

below, with the maximum permissible gain indi-  

cated. Antenna types not included in this list that  

have a gain greater than the maximum gain  

indicated for any type listed are strictly prohibited  

for use with this device.  

The RN4870/71 module has been tested to RED 2014/  

53/EU Essential Requirements mentioned in the  

following European Compliance table.  

TABLE 11-1:

 

EUROPEAN COMPLIANCE  

Certification  

Safety  

Standards  

EN 62368  

Article  

3.1(a)  

Health  

EN 62311  

Le présent émetteur radio  

Electromagnetic  

Compatibility (EMC)  

EN 301 489-1  

EN 301 489-17  

EN300 328  

3.1(b)  

3.2  

[IC: 12246A-BM70BLES1F2 and IC: 12246A-  

BM71S2] a été approuvé par Innovation, Sciences  

et Développement économique Canada pour  

fonctionner avec les types d’antenne énumérés  

cidessous et ayant un gain admissible maximal.  

Les types d’antenne non inclus dans cette liste, et  

dont le gain est supérieur au gain maximal indiqué  

pour tout type figurant sur la liste, sont strictement  

interdits pour l’exploitation de l’émetteur.  

Radio  

Immediately following the above notice, the manufac-  

turer shall provide a list of all antenna types approved  

for use with the transmitter, indicating the maximum  

permissible antenna gain (in dBi) and required  

impedance for each.  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 41  

RN4870/71  

The ETSI provides guidance on modular devices in  

“Guide to the application of harmonised standards  

covering Article 3.1(b) and Article 3.2 of the Directive  

2014/53/EU RED to multi-radio and combined radio  

and non-radio equipment”

document available at:  

11.3.4  

HELPFUL WEBSITES  

A document that can be used as a starting point in  

understanding the use of Short Range Devices (SRD) in  

Europe is the European Radio Communications Com-  

mittee (ERC) Recommendation 70-03 E, which can be  

downloaded from the European Radio Communications  

.  

Note:  

To

m

aintain conformance to the standards  

listed in the preceding European Compli-  

ance table, the module shall be installed in  

accordance with the installation instructions  

in this data sheet and shall not be modified.  

When integrating a radio module into a  

completed product, the integrator becomes  

the manufacturer of the final product and is  

therefore responsible for demonstrating  

compliance of the final product with the  

essential requirements against the RED.  

Additional helpful websites are:  

• Radio

 

Equipment Directive (2014/53/EU):  

• European

 

Conference of Postal and  

T

e

lecommunications Administrations (CEPT):  

• European

 

T

e

lecommunications Standards  

Institute (ETSI):

• The

 

Radio Equipment Directive Compliance  

Association (REDCA):

11.3.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

11.4 Japan  

The label on the final product which contains the  

RN4870/71 module must follow CE marking  

requirements.  

The RN4870/71 module has received type certification,  

and is labeled with its own technical conformity mark  

and certification number, as required, to conform to the  

technical standards regulated by the Ministry of Internal  

Affairs and Communications (MIC) of Japan pursuant  

to the Radio Act of Japan.  

11.3.2  

CONFORMITY ASSESSMENT  

From ETSI Guidance Note EG 203367, Section 6.1,  

non-radio products are combined with a radio product:  

Integration of this module into a final product does not  

require additional radio certification, provided installa-  

tion instructions are followed and no modifications of  

the module are allowed. Additional testing may be  

required:  

• If

 

the manufacturer of the combined equipment  

installs the radio product in a host non-radio  

product in equivalent assessment conditions  

(i.e., host equivalent to the one used for the  

assessment of the radio product) and according  

to the installation instructions for the radio  

product, then no additional assessment of the  

combined equipment against Article 3.2 of the  

RED is required.  

• If

 

the host product is subject to electrical appliance  

safety (for example, powered from an AC mains),  

the host product may require Product Safety  

Electrical Appliance and Material (PSE) testing.  

The integrator should contact their conformance  

laboratory to determine if this testing is required.  

11.3.3  

APPROVED ANTENNAS  

• There

 

is a voluntary Electromagnetic Compatibility  

(EMC) test for the host product administered by  

VCCII:

.  

For RN4870, the approval is received using the antenna  

listed in

Figure 8-1

.  

For RN4871, the approval is received using the antenna  

listed in

Figure 8-2

.  

11.4.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

11.3.3.1  

Simplified EU Declaration of  

Conformity  

The label on the final product which contains the  

RN4870/71 module must follow Japan marking  

requirements. The integrator of the module should refer  

to the labeling requirements for Japan available at the  

Ministry of Internal Affairs and Communications (MIC)  

website.  

Hereby, Microchip

T

e

chnology Inc. declares that the  

radio equipment type RN4870/71 is in compliance  

with Directive 2014/53/EU.  

The full text of the EU declaration of conformity for this  

product is available at:  

(available under

Documents > Certifications

).  

DS50002489G-page 42  



2016-2023 Microchip Technology Inc.  

RN4870/71  

The RN4870 module is labeled with its own technical  

conformity mark and certification number. The final  

product in which this module is being used must have  

a label referring to the type of certified module inside:  

Due to the limited size of the RN4871, the KC mark is  

not displayed on the module. Therefore, the final  

product requires the KC mark and certificate number of  

the module:  

Contains transmitter module with certificate number:  

11.5.2  

HELPFUL WEBSITES  

Due to the limited size of the RN4871, the technical  

conformity mark and certification number are not dis-  

played on the module. Therefore, the final product in  

which this module is being used must have a label  

referring to the type of certified module inside:  

Korea Communications Commission (KCC):  

National Radio Research Agency (RRA):  

Contains transmitter module with certificate number:  

11.6 Taiwan  

The RN4870/71 module has received compliance  

approval in accordance with the

T

e

lecommunications  

Act. Customers seeking to use the compliance  

approval in their product should contact Microchip  

T

e

chnology sales or distribution partners to obtain a  

Letter of Authority.  

Integration of this module into a final product does not  

require additional radio certification, provided installa-  

tion instructions are followed and no modifications of  

the module are allowed.  

11.4.2  

HELPFUL WEBSITES  

Ministry of Internal Affairs and Communications (MIC):  

Association of Radio Industries and Businesses (ARIB):  

11.6.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

11.5 Korea  

The RN4870 module is labeled with its own NCC ID  

number, and if the NCC ID is not visible when the  

module is installed inside another device, then the out-  

side of the device must also display a label referring to  

the enclosed module. This exterior label can use  

wording such as the following:  

The RN4870/71 module has received certification of  

conformity in accordance with the Radio Waves Act.  

Integration of this module into a final product does not  

require additional radio certification, provided installa-  

tion instructions are followed and no modifications of  

the module are allowed.  

11.5.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

Due to the limited size of the RN4871, the NCC ID is  

not displayed on the module. Therefore, the outside of  

the device must also display a label referring to the  

enclosed module. This exterior label can use wording  

such as the following:  

The label on the final product, which contains the  

RN4870/71 module, must follow KC marking require-  

ments. The integrator of the module should refer to the  

labeling requirements for Korea available on the Korea  

Communications Commission (KCC) website.  

The RN4870 module is labeled with its own KC mark.  

The final product requires the KC mark and certificate  

number of the module:  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 43  

RN4870/71  

The user’s manual should contain the below warning  

(for RF device) in traditional Chinese:  

11.8 Brazil  

The RN4871 stereo audio modules have received  

compliance approval in accordance with the

T

e

lecom-  

munications Act of the Federal Republic of Brazil  

National

T

e

lecommunications Agency (ANATEL).  

Customers seeking to use the compliance approval in  

their product must contact Microchip

T

e

chnology Inc.  

sales or distribution partners to obtain a Letter of  

Authority.  

注意

!

 

依據 低功率電波輻射性電機管理辦法  

第十二條 經型式認證合格之低功率射頻電機，  

非經許可，  

公司、商號或使用者均不得擅自變更頻率、加大  

功率或變更原設計  

The end product (host) manual must include the following  

statement:  

之特性及功能。  

第十四條 低功率射頻電機之使用不得影響飛航安  

全及干擾合法通信；  

經發現有干擾現象時，應立即停用，並改善至無  

干擾時方得繼續使用。  

Modelo: RN4871  

前項合法通信，指依電信規定作業之無線電信。  

低功率射頻電機須忍受合法通信或工業、科學及  

醫療用電波輻射性  

電機設備之干擾。  

02699-19-08759  

11.6.2  

HELPFUL WEBSITES  

“Este equipamento não tem direito à proteção contra  

interferência prejudicial e não pode causar interferência  

em sistemas devidamente autorizados”.  

National Communications Commission (NCC):  

11.7 China  

Este producto contém a placa Modelo RN4871  

código de homologação ANATEL 02699-19-08759.  

The RN4870/71 module has received certification of  

conformity in accordance with the China MIIT Notice  

2014-01 of State Radio Regulation Committee (SRRC)  

certification scheme. Integration of this module into a  

final product does not require additional radio certifica-  

tion, provided installation instructions are followed and  

no modifications of the module are allowed.  

11.9 UKCA

 

(UK Conformity Assessed)  

The RN4870/71 module is a UK conformity assessed  

radio module that meets all the essential requirements  

according to CE RED requirements.  

Refer to the SRRC certificate available in:  

or for expiry date:  

11.9.1  

LABELING REQUIREMENTS FOR  

MODULE AND USER’S  

REQUIREMENTS  

The label on the final product that contains the  

RN4870/71 module must follow the UKCA marking  

requirements.  

11.7.1  

LABELING AND USER  

INFORMATION REQUIREMENTS  

The RN4870 module is labeled with its own CMIT ID as  

follows:  

The RN4871 module is labeled with its own CMIT ID as  

follows:  

DS50002489G-page 44  



2016-2023 Microchip Technology Inc.  

RN4870/71  

utility is available. For further regulatory certification  

utility and documentation, contact your local Microchip  

T

e

chnology sales office.  

11.11 Other

 

Regulatory Information  

• For

 

information about other country jurisdictions  

not covered here, refer to:  

• Should

 

other regulatory jurisdiction certification be  

required by the customer, or the customer needs  

to recertify the module for other reasons, contact  

Microchip for the required utilities and  

documentation.  

The UKCA mark above is printed on the module itself  

or on the packing label.  

Additional details for the label requirement are avail-  

able at:  

.  

11.9.2  

UKCA DECLARATION OF  

CONFORMITY  

Hereby, Microchip

T

e

chnology Inc. declares that the  

radio equipment type RN4870/71 is in compliance with  

the Radio Equipment Regulations 2017.  

The full text of the UKCA declaration of conformity for  

this product is available (under

Documents > Certifica-  

tions

) at:  

11.9.3  

APPROVED ANTENNAS  

For RN4870, the approval is received using the  

antenna listed in

Figure 8-1

.  

For RN4871, the approval is received using the  

antenna listed in

Figure 8-2

.  

11.9.4  

HELPFUL WEBSITES  

For more information on the UKCA regulatory approv-  

als, refer to the

11.10 Other

 

Regulatory Jurisdictions  

Should other regulatory jurisdiction certification be  

required by the customer, or the customer needs to  

recertify the module for other reasons, a certification  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 45  

RN4870/71  

Revision F (June 2022)  

APPENDIX A:

 

REVISION HISTORY  

TABLE F-1:  

Section  

MAJOR SECTION UPDATES  

Revision A (April 2016)  

Update Description  

This is the initial release of this document.  

11.9 “UKCA (UK Con-  

formity Assessed)”  

Added UKCA regulatory  

approval information  

Revision B (October 2017)  

• Added

 

the new parts, RN4870-I/RMXXX and  

RN4871-I/RMXXX, released with increased  

operating temperature range.  

Revision G (March 2023)  

• Updated

 

(included Voltage Monitor/Reset IC on  

the reference circuit)

Figure 5-2

,

Figure 5-3

,  

Figure 5-4

and

Figure 5-5  

• Updated

 

Features section and removed  

Description section on page 1.  

• Updated

 

T

a

ble 1-1

,

T

a

ble 1-2

,

T

a

ble 1-4

and  

T

a

ble 10-1

.  

• Revised

 

T

a

ble 2-1

through

T

a

ble 2-4

.  

• Updated

 

Figure 1-4

,

Figure 3-1

,

Figure 3-2

and  

Figure 4-7

.  

• Added

 

Section 11.7 “China”

to

Section 11.0  

“Regulatory Approval”

.  

• Updated

 

T

a

ble 10-1

and

“Product Identification  

System”

.  

Revision C (December 2017)  

• Updated

 

T

a

ble 2-1

to correct information for the  

operating temperature range.  

Revision D (April 2019)  

• Updated

 

Bluetooth version from 4.2 to 5.0.  

• Updated

 

Features

and

Antenna Options

.  

• Updated

 

Figure 5-2

,

Figure 5-3

,

Figure 5-4

and  

Figure 5-5

.  

• Updated

 

Figure 9-1

and

Figure 9-2

(P2_0 = 1).  

• Updated

 

Section 7.0 “Supported Services”

.  

• Updated

 

Section 11.2 “Canada”

and  

Section 11.3 “Europe”

.  

Revision E (February 2021)  

• Added

 

new description for VDD_IO pins in  

T

a

ble 1-2

.  

• Added

 

labeling information of Brazil for RN4871  

module.  

• Added

 

Section 11.1.3 “Approved Antennas”

,  

Section 11.2.3 “Approved Antennas”

and  

Section 11.8 “Brazil”

.  

• Updated

 

Section 11.2.1 “Labeling and User  

Information Requirements”

,

Section 11.3  

“Europe”

and

Section 11.7 “China”

.  

DS50002489G-page 46  



2016-2023 Microchip Technology Inc.  

RN4870/71  

NOTES:  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 47  

RN4870/71  

THE MICROCHIP WEBSITE  

CUSTOMER SUPPORT  

. This website is used as a means  

to make files and information easily available to  

customers. Accessible by using your favorite Internet  

browser, the website contains the following information:  

Users of Microchip products can receive assistance  

through several channels:  

• Distributor

 

or Representative  

• Local

 

Sales Office  

• Field

 

Application Engineer (FAE)  

•

T

e

chnical

 

Support  

•

Product Support

– Data sheets and errata,  

application notes and sample programs, design  

resources, user’s guides and hardware support  

documents, latest software releases and archived  

software  

Customers  

should  

contact  

their  

distributor,  

representative or Field Application Engineer (FAE) for  

support. Local sales offices are also available to help  

customers. A listing of sales offices and locations is  

included in the back of this document.  

•

General Technical Support

– Frequently Asked  

Questions (FAQ), technical support requests,  

online discussion groups, Microchip consultant  

program member listing  

•

Business of Microchip

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CUSTOMER CHANGE NOTIFICATION  

SERVICE  

Microchip’s customer notification service helps keep  

customers current on Microchip products. Subscribers  

will receive e-mail notification whenever there are  

changes, updates, revisions or errata related to a  

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. Under “Support”, click on  

“Customer Change Notification” and follow the  

registration instructions.  

DS50002489G-page 48  



2016-2023 Microchip Technology Inc.  

RN4870/71  

NOTES:  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 49  

RN4870/71  

PRODUCT IDENTIFICATION SYSTEM  

To

o

rder or obtain information, for example, on pricing or delivery, refer to the factory or the listed sales office.  

V

PART NO.  

Device  

RM  

XXX  

Example:  

RN4870-V/RM118: Various

 

temperature  

Temperature  

Range  

Package  

Firmware  

Revision  

Number  

RN4870-I/RM128: Industrial

 

temperature  

Device:  

RN4870:  

RN4870U: External

 

Antenna  

RN4871: Ceramic

 

Chip Antenna  

RN4871U: External

 

Antenna  

Ceramic Chip Antenna  

Note 1:  

T

a

pe and Reel identifier only appears in the  

catalog part number description. This  

Temperature  

Range:  

V

I

=

=

-20



C to +70



C (Various)  

-40



C to +85



C (Industrial)  

identifier is used for ordering purposes and  

is

not

printed on the device package. Check  

with your Microchip Sales Office for package  

availability with the

T

a

pe and Reel option.  

Package:  

RM  

=

Radio Module  

DS50002489G-page 50  



2016-2023 Microchip Technology Inc.  

RN4870/71  

NOTES:  



2016-2023 Microchip Technology Inc.  

DS50002489G-page 51  

RN4870/71  

DS50002489G-page 52  



2016-2023 Microchip Technology Inc.  

Note the following details of the code protection feature on Microchip products:  

•

Microchip products meet the specifications contained in their particular Microchip Data Sheet.  

•

Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and  

under normal conditions.  

•

•

Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of  

Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.  

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not  

mean that we are guaranteeing the product is “unbreakable” Code protection is constantly evolving. Microchip is committed to  

continuously improving the code protection features of our products.  

This publication and the information herein may be used only  

with Microchip products, including to design, test, and integrate  

Microchip products with your application. Use of this informa-  

tion in any other manner violates these terms. Information  

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.  

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AVR logo, AVR Freaks, BesTime, BitCloud, CryptoMemory,  

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T

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