Hi Team
My customer Zhuzhou is using PCA9557 and met some problem for reset function.
I've read the previous discussion for PCA9557 and there're 3 ways to reset the device:
1. keep VCC low longer than 100ms and Power on less than 10ms, I've tried many time and failed to reset the device;
2. Reset pin keep low longer than 400ns, still failed;
3. 9 clock pulses, succeed, but I don't know why it worked, any explanation or potential risk by using this way?
And it seems we don't have TCA9557 to replace PCA part, any recommendations?
