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Function: Use one ADC to collect 16 analog signals
Analog signal input: C0-C15 16 channels
Analog output: DIG
Channel control: S0-S3
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’t 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. 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”).
2V to 6V operation
“On” resistance: 70 Ohms @ 4.5V
6ns break-before-make @ 4.5V
Wide operating temperature range: -55C to 125C
Thomas
2025-03-03 11:34:54
For me these are an interesting tinker toy so bearing that in mind, I have not found any defects in them to start with. They appear well made to decent specs and tolerances and no soldering issues were noted. These are CMOS therefore low power consumption and low power leakage when in use. There is an enable control line which when driven high will disable all outputs. I've not coded this for testing but is pretty straightforward.
Mike W.
2025-02-18 18:45:41
Well made multiplexer breakout module, I have a lot of sensors that I am working with and needed to be able to break them out a bit more so that I could actually fit everything into my device. Overall this works outstanding once you are able to determine the right way to read it. This will not come with instructions so it's best to lookup the data sheet by searching for the specific part number: CD74HC4067. Overall great module and board.
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