Other Parts Discussed in Thread: UCD9090, LM77
Hi Experts
could UCD9090 do power down sequence?
My customer check it on Sequence off dependencies. but it doesn't work
best
regards
brian
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Hi Experts
could UCD9090 do power down sequence?
My customer check it on Sequence off dependencies. but it doesn't work
best
regards
brian
Hi
Please follow this user guide to understand how to use UCD.
Regards
Yihe
Hi Yihe
turn off parameter doesn't work after my customer follow the slides
another question is could he use GPI to sequence off ? for active high/low
Best
regards
brian
Hi
You have to configure the fault response to shutdown. Pleas read the slide thoroughly
You can enable PIN SELECTED RAIL STATE to use GPI to turn on or turn off the power sequence.
Regards
Yihe
Hi Yihe
my customer turn rail#2-10 ON/OFF config to operation only. that can be shut down but the voltage can't recover.
even they restart the system.
is it relate to fault response ?
and I will sent you customer code by e mail.
BRs
brian
Hi
First remove the turn off dependency of LM77_OT
2nd. based on your settings, the only way to turn on the system is to have
LM75BD_INT = LOW and LM77_OT = HIGH.
Please ensure this.
Regards
Yihe
Hi Yihe
thx for your reply . our customer complete the system restart already .
but they face another issue about the power rail sequence
you can find the slide to explain this question and code as below
OS6870-P48M_U12_UCD9090_V02_20230704.xml
OS6870-UCD9090 Power Sequence.pptx
BRs
Brian
Hi
The reason is that you have the shutdown immediately set for the fault response of each rail.
So the dependencies does not matter if it is immediately off.
based on the capture, you want that all rails are off when the 12V loses its power
what you need to do is to add the rest rails as the fault shutdown slaves of 12V and check all the rail to be off.
Regards
Yihe
Hi Yihe
thx for your kindly help
everything have been solved in customer side.
BRs
Brian