AM2634-Q1: Questions about ESM and error pin.

Will Gao

Part Number: AM2634-Q1

Hi experts,

I have two questions about ESM:

1. The behavior of error pin under PWM mode: if the device is in normal operational mode the error pin will toggle with a configured frequency and width, but if the device was detected with some failure, the error pin will stop toggling and will maintain the state (no matter if it is 1 or 0) before the failure, right?

2. In customer design, the error pin will connect to external PMIC or SBC. They want to know the reset output of PMIC or SBC should connect to whether PORz or WARMRST pin? Do we have any recommendation? Since in ESM description, the error pin's state will be re-asserted in PORz reset but not WARMRST reset.

Regards,

Will

over 3 years ago

0 Kowshik Gudimetla over 3 years ago

TI__Genius 15435 points

Hi Will Gao

I'm looking into this query, will come back before tomorrow EOD.

Thanks

+1 Kowshik Gudimetla over 3 years ago in reply to Kowshik Gudimetla

TI__Genius 15435 points

Hi Will Gao

Regarding your 1st query, yes your understanding is correct. The ESM pin continues the PWM patterns if the error is cleared, if it's not cleared after a period of time then an external controller must intervene. You can find this in TRM page 1332 too

2. It is always recommended to connect the PORz (Cold Reset) the SoC when the SoC is stuck in an un-recoverable state. Doing a warm reset might not reset the SoC there by not resulting in the recovery.

Hope this helps.

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AM2634-Q1: Questions about ESM and error pin.