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STPMIC1 - PONKEYn POWER_ON POWER_DOWN trigger

SYEH
Associate II

For STPMIC1, when it is powered on by asserting the PONKEYn signal low, what would happen if the PONKEYn remains asserted low even after the initial POWER_ON trigger? Would it subsequently trigger a POWER_DOWN if PONKEYn long press turn off is activated? Or is the PONKEYn event triggered only when there is a HIGH to LOW edge transition (edge trigger) ?

Thanks.

Steven

1 ACCEPTED SOLUTION

Accepted Solutions
Olivier GALLIEN
ST Employee

Hi @SYEH​ 

In that case STPMIC1 will not trig a POWER DOWN. You need another HIGH to LOW edge transition to start the Long Key Press timer.

Hope it help,

Olivier

Olivier GALLIEN
In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

View solution in original post

4 REPLIES 4
Olivier GALLIEN
ST Employee

Hi @SYEH​ 

In that case STPMIC1 will not trig a POWER DOWN. You need another HIGH to LOW edge transition to start the Long Key Press timer.

Hope it help,

Olivier

Olivier GALLIEN
In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

Hi Olivier,

Thanks for the reply. Understood.

Is that the same for the WAKEUP pin? As in the WAKEUP POWER_ON event will only trigger from LOW to HIGH edge transition, and does not require to stay HIGH after the initial trigger?

Thanks.

Steven.

Yes WAKEUP pin is edge sensitive. Except in the situation explain in DataSheet Figure 58. Turn-on condition before VIN_POR_Rise.

Olivier

Olivier GALLIEN
In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.
SYEH
Associate II

Hi Olivier,

Thanks for the response. Much appreciated.

All clear now.

Cheers.

Steven