DS3231 AT24C32 Precision Clock Module

DS3231 AT24C32 Precision Clock Module For Raspberry Pi(3.3V/5V)

Introduction

DS3231 is a low-cost, high-precision I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. It features a battery input for maintaining precise timing during power loss. The integrated crystal enhances long-term accuracy and reduces production line components. The DS3231 is available in a 16-pin 300mil SO package and operates across supplier and industrial temperature ranges.

Besides its high timing accuracy, the DS3231 offers additional functions, enhancing system host options. It integrates a highly accurate digital temperature sensor accessible via the I2C interface. The temperature sensor’s accuracy is within ±3°C. On-chip control circuitry enables automatic power detection and manages power switching between the main and backup sources. In case of main power failure, the device maintains accurate timing and temperature without performance loss. Upon main power restoration, the on-chip reset function restarts the system if the voltage returns within the microprocessor’s allowable range.

Parameters

• Size: 39mm (length)* 23mm (width)* 14mm (height)
• Weight: 5.2g
• Working voltage: 3.3-5.5V
• Clock chip: High-precision clock chip DS3231
• Clock accuracy: within 0-40 °C, accuracy is 2ppm, annual error is about 1 minute
• With 2 calendar alarm clocks
• Programmable square wave output
• Real-time clock generates time in seconds, minutes, hours, days of the week, date,month and year, and provides leap year compensation valid until 2100
• The chip comes with a temperature sensor with an accuracy of ±3°C.
• Storage chip:AT24C32(storage capacity 32K)
• IC bus interface, the maximum transmission speed is 400KHz (when the working voltage is 5V)
• can be cascaded with other IIC devices, 24C32 address can be modified by short-circuit A0/A1 /A2, the default the address is 0x57
• with battery CR2032, to ensure that the clock still moves normally after the system  is powered off
• Packaging: single anti-static packaging

Pin Description

Diagram