Powertrain and Electrification Analog DriversのトピックRe: restart pmic

restart pmic

liyw — Mon, 18 Nov 2024 12:40:57 GMT

Test Request and Observation:

I have a test request where I need to frequently restart the MCU (Microcontroller Unit).

During the testing process, I observed that the PMIC (Power Management Integrated Circuit) FS84 entered the DEEP-FS mode. This may be due to frequent feeding of the Watchdog Timer (WD) trigger.

Issue Encountered:

When I restart the MCU, the PMIC does not restart. Therefore, I hope to restart the MCU by first restarting the PMIC.

Question:

However, I don't know how to restart the PMIC FS84 using an SPI (Serial Peripheral Interface) command.

Re: restart pmic

TomasVaverka — Tue, 19 Nov 2024 09:53:01 GMT

Hi,

Here is a summary when the FS84 enters the DEEP-FS mode.

In your case I suppose that the FLT_ERR_CNT reached its limit due to incorrect WD refresh.

The following methods can be used to exit the DEEP-FS mode.

BRs, Tomas

Re: restart pmic

liyw — Tue, 19 Nov 2024 10:14:35 GMT

Hi,

TomasVaverka, Thank you for your answer.
Via testing, I know the cause of entered DEEP-FS mode is a bad refresh of WD. However, resetting the MCU is my purpose, so I don't want the PMIC to enter DEEP-FS mode.
1. how do I feed the watchdog? Currently, I feed the watchdog when the MCU starts.
2.how do I stop PMIC fault detection?

Re: restart pmic

TomasVaverka — Tue, 19 Nov 2024 10:31:02 GMT

Hi,

BRs, Tomas

Re: restart pmic

liyw — Wed, 20 Nov 2024 01:39:39 GMT

hi,

Tomas,

When I want to restart the MCU, the PMIC has entered the normal phase, not INIT_FS, and I cannot wait too long for the next good watchdog (WD) reset.

So I cannot disable the watchdog timer. I hope to reset the MCU without triggering any errors. How should I do this?

Re: restart pmic

liyw — Fri, 22 Nov 2024 09:51:56 GMT

Thank you to Tomas,

The FLT_ERR_CNT reached its limit due to an incorrect watchdog (WD) refresh. Here's how I plan to address it:

1.When the MCU starts, I will check if the PMIC has initialized. If it has, I will not feed the WD until a close window time. If the PMIC has not initialized, I will feed the WD immediately.
2.When I restart the MCU, I will check if the watchdog refresh time exceeds the close window. If it does, I will refresh the WD immediately.
3.By using this method, I will resolve the issue of incorrect WD refresh errors.

Re: restart pmic

quangvuanh — Mon, 30 Dec 2024 10:23:18 GMT

Hi Liyw, are you using SBC FS8X software driver provided by NXP?

Re: restart pmic

liyw — Tue, 31 Dec 2024 09:33:10 GMT

yes

Re: restart pmic

quangvuanh — Tue, 31 Dec 2024 09:58:16 GMT

Hi, I am not sure what software version that you are using with the snippet you provided.
By the way, based on the information you shared I think you should force the device into INIT_FS on every reset event, by setting this bit GOTO_INITFS in FS_SAFE_IOs register.

Can you please also let me know what version of the driver that you are using?