topic Re: FS8530 Vpre Not Output in PowerQUICC Processors

FS8530 Vpre Not Output

jhhan — Tue, 06 Aug 2024 07:47:33 GMT

HI~

Now I use FS8530 PMIC
VBOS => VPRE => VBoost => BUCK1/BUCK2/BUCk3/LDO1/LDO2
The power supply operates normally with the WakeUP 1 signal.
I have a problem.
When powered off, change the PMIC to GotoStandby.
However, if the Wakeup1 signal occurs due to quick power application,

the Vpre power is not output. (Most normal working)
Current register settings changes, do not solve the problem.
I would appreciate it if you could let me know if there is a solution.

Re: FS8530 Vpre Not Output

guoweisun — Wed, 07 Aug 2024 07:37:00 GMT

Please help and check whether you match below red circled conditions to turn on Vpre:

guoweisun_0-1723016202950.png

Re: FS8530 Vpre Not Output

jhhan — Wed, 07 Aug 2024 08:23:48 GMT

Thank you for your quick response.

1. Wake1 = '1' DBG = '0' , I think go to Next

2. VSUP > VSUP_uvh: OK

VBOS > VBOS_uvh : OK

I don't know the condition that FS_READY '1'

Psync is '0' when measured with an oscilloscope.

The OTP setting is shown in the attached figure.

Re: FS8530 Vpre Not Output

jhhan — Wed, 07 Aug 2024 08:24:19 GMT

attached figure

Re: FS8530 Vpre Not Output

guoweisun — Fri, 09 Aug 2024 03:05:31 GMT

FS_READY '1' means A synchronization between Main and Fail safe state machines, which is indeed VSUP > VSUP_UVH and WAKE1
or WAKE2 > WAKE12VIH, and LBIST has been executed