Hello,
I have a question for LOGIC controlled GPO behavior when using VOUT_UV_FAULT as an input, especially before and during power-up sequence of monitored rail.
Now one LOGIC controlled GPO is configured as Active High with NOT RAIL1(VOUT_UV_FAULT) condition.
Could you see the below figure that explains my question?
1)
At first, the GPO output is HIGH right after UCD9090A powering up and it keeps HIGH before and during RAIL 1 power-up sequence.
After RAIL 1 voltage going over UV condition once, it starts to detect UV condition.
2)
After GPO goes low because of detecting UV_FAULT condition, OPERATION goes LOW to restart sequence.
In this case, GPIO keeps LOW before and during RAIL 1 power-up sequence till RAIL1 voltage reaches over UV condition.
3)
OPERATION goes to LOW without UV_FAULT condition.
In this case, GPO keeps HIGH before/during/after RAIL1 power-up sequence.
From this test, the behavior of LOGIC controlled GPO with “NOT VOUT_UV_FAULT” input before and during power-up of monitored rail looks like the below.
1) Right after UCD9090A powering up, it is always HIGH
2) After once monitored rail reach over UV condition, it keeps the status of the GPO at the last OPERAION falling edge timing.
Is this assumption correct? Is this behavior, especially 2), intended?
Regards,
Oba
