VR5510 restart when receive stdby request

[brian_w]

Hi all,

I use vr5510 and s32g2.

The FS status is NORMAL_FS, the FLT_ERR_CNT is 0, and the Main state machine is in normal mode.

I config the STBY_TIMER_EN and TIMING_WINDOW_STDBY of vr5510 to zero. The standby watchdog of vr5510 is closed. The time limit of I2C request and STBY pin request is also closed.

Then I config the STBY_REQ to 1 and pull low the STBY pin.

After 100ms, VR5510 will pull down PGOOD, RESET_B and STBY_PGOOD.

This means vr5510 does not enter standby mode, but restart.

How should I solve this problem?

[Yang_C]

Hi Brian,

Have you resolved your issue?

Recently I am trying to set the VR5510 to standby mode by S32G399 too. I have the same configuration as yours and when i set the STBY_REQ high via I2C, PMIC reset happens. 

Hope you can give me some advice.

Looking forward to your reply, thanks.

Yang

[brian_w]

Hi Jozef,

thanks for your kindly replay, I'll follow your suggestion and see the result.

thanks again.

[JozefKozon · Accepted solution]

Hi Brian,

please note, that entering Standby mode is not possible in Debug mode. Please make sure that you are not in Debug mode. Either by connecting the VDDOTP to GND or writing DBG_EXIT bit = 1. To disable the Stanby timer it is sufficient to set the STBY_TIMER_EN to 0. By setting the TIMER_STBY_WINDOW [3:0] to 0x0000, you have set it to 16ms. Please try to set there some different value to see if the restart will happen again in 100ms or after longer time value. Please try e.g. 0x0110. This will set the TIMER_STBY_WINDOW [3:0] to 8192ms=8.2s. 

With Best Regards,

Jozef