The I2C multiplexer allows the connecting of multiple I2C devices with the same address onto a single I2C bus.
Whilst you can get the same I2C multiplexer IC (TCA9548A) on generic breakout boards, the pHAT creates a compact solution which is great for remote monitoring and graphing when coupled with a Raspberry Pi Zero W (can be used with any model of Pi).
For each multiplexed output there are 4 pins:
- SDAx (data)
- SCLx (data)
- GND (ground)
- V (power)
The EEPROM automatically loads the correct i2c-mux overlay and turns it into 8 individual I2C busses (/dev/i2c-3 to /dev/i2c-10) allowing direct communication with the I2C devices as normal (i2cdetect / i2cget / i2cset / Python SMBUS, etc).
Note: The "V" output can be altered from the default 3.3 volts to 5 volts by cutting the PCB trace between V and 3v3 and bridging V to 5v. The 3.3v supply is taken directly from the Pi 3v3 rail so care should be taken not to overload it.
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