Other Parts Discussed in Thread: TCA9406
Hi
I am using a I2C LT which is connects processor I2C bus to TCA9538 PW I/O expander IC .Processor 12C side is 1.8V and TCA9538PW side is 3.3.The power to the IC TCA9538PW is provided through a Switch .By default the I2C line is connected to the I/O ex pander(and pullup on this lines is also connected ) but power is not connected to the IC by default .The power pin of the IC is reading 0.4 V even if the power line is completely disconnected the 0.4V is appearing between power pin and GND pin of the IC