CD74HC4067 16-Channel Analog Multiplexer Module for Arduino

CD74HC4067 Analog Multiplexer Description

This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This chip is like a rotary switch – itinternally routes the common pin (COM in the schematic, SIG on the board) toone of 16 channel pins (CHANxx). It works with both digital and analog signals(the voltage can’t be higher than vCC), and the connections function in either direction.To control it, connect 4 digital outputs to the chip’s address selectpins (S0-S3), and send it the binary address of the channel you want (see the data sheet for details).This allows you to connect up to 16 sensors to yoursystem using only 5 pins! 

Since the mux/demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices For example,you could use ito connect the TX pins of 16
devices to one RX pin on your microcontroller.You can then select any one of those 16 devices to listen to. If you wanttwo-way communications, you can add a second board to route your microcontroller’s TX line to 16 device’s RX lines. By using multiple boards,you can create similar arrangements for I2C, SPI, etc.

The internal switches are bidirectional, support voltages between groundand vCC,have low “on” resistance and low“off’ leakage,and to preventcrosstalk, perform“break-before-make”switching.The board also breaks outthe chip’s “enable”pin,which when driven high, will completely disconnect the common pin (all switches”off”).

CD74HC4067 Analog Multiplexer Features

• 2V to 6V operation
• “On” resistance: 70 Ohms at 4.5V
• 6s break-before-make at 4. 5V
• Wide operating temperature range：-55℃ to 125℃
• Function: gathering all the way ADC 16 analog signals
• Use CD74HC4067 16-channel analog signal switch
• Analog Input: C0-C15 16 channels
• Analog output: DIG
• Channel Control: S0-S3