Hi Team,
As per TCA6408A-Q1 datasheet Page 29 under “Power Supply Recommendations”, do design need to follow power up pattern/ reset pattern to bring the IO expander out of reset as shown in Fig 36,37. What issues it can create if doesn't follow power up/reset sequence.
In my customer application they will not have access to the unit power supply as it is battery operated and installed in remote section.
Regards, Shinu.