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Original question:

PCA9555: the status of I/Os is input & pull-high while power on without I2C commands.

PCA9555: What are the status of I/Os while power on with I2C set output initial?

Wilson Chang72
Prodigy 40 points
Part Number: PCA9555

Hi team


We use PCA9555 for LED control,


sometimes, we cloud find the I/Os (P00-P07 & P10-P13) are low (about 0.1V) while power on with I2C set output initial.


somtimess, we cloud find the status of  I/Os (P00-P07 & P10-P13) are different, P06 & P07 are low (about 0.1V), others are high (about 3.2V), while power on with I2C set output initial.


How can we keep the status of  I/Os are high while power on with I2C set output initial?


Thanks.