CJMCU-16 analog switch module Analog / Digital MUX Breakout CD74HC4067
Description:
This is a breakout board for the very handy 16-Channel Analog / Digital
Multiplexer / Demultiplexer CD74HC4067 This chip is like a rotary
switch - it internally routes the common pin (COM in the schematic, SIG
on the board) to one of. 16
channel pins (CHANxx). It works with both digital and analog signals
(the voltage can not be higher than VCC), and the connections function
in either direction. To control it, connect 4 digital outputs to the
chip's address select pins ( S0-S3), and send it the binary address of the channel you want (see
the datasheet for details). This allows you to connect up to 16 sensors
to your system 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 it to 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
want two-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 ground
and VCC, have low "on" resistance and low "off" leakage, and to prevent
crosstalk, perform "break-before-make" switching. The board also breaks
out the chip's "enable "pin, which when driven high, will completely disconnect the common pin (all switches" off ").
Features:
2V to 6V operation
"On" resistance: 70 Ohms @ 4.5V
6ns break-before-make @ 4.5V
Wide operating temperature range: -55C to 125C
