Ground (0 V) connection of GND power supply. Your I2C control source must also share a common ground with the board.
XSHUT This pin is a low-level effective shutdown input; By default, the board pulls it up to VDD to enable the sensor. Drive the pin to a low level to put the sensor into hardware standby mode. This input does not perform level conversion.
SDA level conversion I2C data line: HIGH for VIN, LOW for 0 V
VDD stabilizes 2.8 V output. Almost 150 mA can be used to power external components. If you want to bypass the internal voltage regulator, you can use this pin as a 2.8 V input and disconnect the VIN.
VIN This is the main 2.6 V to 5.5 V power connection. The SCL and SDA level shifters pull the I2C line up to this level.
SCL level shift I2C clock line: HIGH is VIN, LOW is 0 V
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