Hi,
Here is the datasheet shows ICC:
customer's test result is much higher that that, see 40uA, even 270uA.
their test process is as: before MCU's standby, the set TCA9539's IO as input. as datasheet described, IO should be hi-Z input. then cut off IIC. test ICC by current meter at PIN24 Vcc.
is that same as you did? why it's so different? thank you!
best regards
Yuan