During my board power-up cycle, I like to use the ADUCM320 as the power sequencer controller. During the initial power-sequence stages, the ADUCM320 AVDD3/4 and PVDD power rails will be shutdown. My questions are:
1) Could the ADUCM320 digital I/Os properly function without the AVDD and PVDD?
2) Can I use PORT 5 as a digital I/O without AVDD and PVDD?
3) Could I damage the ADUCM320 when operating without the AVDD and PVDD?
I'm currently trying to implement the power-sequence function with the ADUCM320. I'm getting strange digital I/O levels such as 2V for high instead of 3.3V. I've also seen a strange crosstalk between PORT 5 pins...