TPS65381A-Q1: Disable Regulators on demand to Shutdown MCU

Sakti Kumar Padhy

Part Number: TPS65381A-Q1
Other Parts Discussed in Thread: TMS570LC4357

Hello,

we are using a Custom PCB where we are using MCU(TMS570LC4357) and PMIC(TPS65381Q1). I want to disable the Voltage Regulators in PMIC to shutdown the MCU.

I can see that the PMIC can move to STANDBY MODE and disable the Regulators only in these cases: -

1. When IGN and CANWU is disconnected and Register SAFETY_FUNC_CFG bit IGN_PWRL is made 0 from any STATE.

2. In case of Faults like VDD3/5_OT, VBATP_UV, LOCKL, BG_ERR, AVDD_VMON_ERR, DVDD_OV from any STATE.

3. In case of Development Error Count Error is more than Power Down Threshold from SAFE State.

Any other method to disable the Regulators in PMIC on command so as to shutdown the MCU on demand.

Kind Regards

over 3 years ago

0 Alex Saenz over 3 years ago

TI__Expert 6700 points

Hello Sakti,

We have assigned this ticket to the appropriate engineer and he should be getting back to you soon.

Regards,
Alex

0 Layne J over 3 years ago in reply to Alex Saenz

TI__Genius 12735 points

Hello,

The best way to disable the device is bringing the CANWU and/or IGN pins low and clearing the power latch for CANWU and IGN as needed. Is there a specific reason for wanting to do this?

Best regards,

Layne J

0 Sakti Kumar Padhy over 3 years ago in reply to Layne J

Prodigy 161 points

Hello Layne,

Thank You for the reply. I wanted to shutdown the MCU by disabling the Voltage Regulator in PMIC even when the IGN Pin is High.

Let me know if this is possible as the only alternate way to move the PMIC to Standby Mode that I can observe is by introducing faults and following the path (ACTIVE -> SAFE -> STANDBY).

Best Regards,

Sakti

0 Alex Saenz over 3 years ago in reply to Sakti Kumar Padhy

TI__Expert 6700 points

Sakti,

Layne should be able to respond to you in the next day or so.

Regards,

Alex

+1 Layne J over 3 years ago in reply to Alex Saenz

TI__Genius 12735 points

Hi Sakti,

It is possible to turn off the VDD5 and VSOUT1 regulators using the VDD5_EN and VSOUT1_EN bits in the SENS_CTRL register. If you need to turn off all of the regulators then you will need to use the IGN or CANWU pins to do so. This could be done with some external logic that could be controlled by the MCU if desired but we do not have any other repeatable mechanisms within our device to turn it off other than the IGN and CANWU pins.

Best regards,

Layne J

Power management

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TPS65381A-Q1: Disable Regulators on demand to Shutdown MCU