SparkFun Analog/Digital MUX Breakout -
CD74HC4067
B OB-09 056 ROH S
6
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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 (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:
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