Function of PWR_BTN_SNS in SABRE-SDP

[ko-hey]

Hi all

I have a question about function of PWR_BTN_SNS in SABRE-SDP.

Could you tell me following question ?

Q1.

In the circuit diagram of SABR-SDP, I think that MX6_ONOFF and PWR_BTN_SNS will be low at the same time when SW1 is pushed.

Are these two signals necessary for returning from DSM ? Or is it only PWR_BTN_SNS ?

Q2.

For the above confirmation, could you verify the operation after removing R22 of SABR - SDP ?

Q3.

It seems that PWR_BTN_SNS is operated with active low.

How long time are required for the input Low section ?

Ko-hey

[igorpadykov · Accepted solution]

Hi Ko-hey

1. both signals can be used for returning from DSM

2. sorry I have not equipment for removing R22 of SABRE - SDP

3.>How long time are required for the input Low section ?

PWR_BTN_SNS is connected to EIM_D29 and configured as GPIO.
GPIO can be configured to produce interrupt on falling edge. So
" Low section" using your wording, can be =0.

Best regards
igor
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[ko-hey]

Hi igorpadykov‌

> 1. both signals can be used for returning from DSM

It's possible to recover with either one signal.

Am I correct ?

Ko-hey

[igorpadykov]

Hi Ko-hey

yes this is correct.

Best regards
igor

[ko-hey]

Hi igorpadykov

According to your answer, i.MX6 can wakeup from MX6_ONOFF or PWR_BTN_SNS signal.

In that case, i.MX6 can wakeup from ONOFF button only because MX6_ONOFF connects only ONOFF pin.

Why does user need PWR_BTN_SNS PWR_BTN_SNS ?

Ko-hey

[igorpadykov]

 i.MX6 can wakeup from any unmasked interrupt.

Best regards
igor

[ko-hey]

Hi igorpadykov‌

Sorry, your comment make me confuse.

In that case, why does PWR_BTN_SNS need ?

The PMIC_STBY_REQ can't make any unmasked interrupt so i.MX6 need PWR_BTN_SNS for wakeup from standby with PMIC_STBY_REQ.

Am I correct ?

Ko-hey

[igorpadykov]

Hi Ko-hey

>why does PWR_BTN_SNS need ?

any unmasked interrupt can wake processor from low power mode.

Both PWR_BTN_SNS and ONOFF can wake.

>The PMIC_STBY_REQ can't make any unmasked interrupt so

>i.MX6 need PWR_BTN_SNS for wakeup from standby with PMIC_STBY_REQ.

>Am I correct ?

for PMIC_STBY_REQ behaviour please check sect.18.5.3.3 STOP mode i.MX6DQ Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

So processor control PMIC_STBY_REQ signal when it enter/exit from low power modes.

To exit from low power mode processor should receive unmasked interrupt (from

PWR_BTN_SNS, ONOFF or other interrupt source).

Best regards
igor

[ko-hey]

Hi igorpadykov‌

Thank you for reply.

I understand that either PWR_BTN_SNS or ONOFF is necessary.

Do user have any SW setting for operating by ONOFF button ?

I guess I need something for make any unmasked interrupt by ONOFF behavior.

Ko-hey

[igorpadykov]

Hi Ko-hey

for new questions/issues please create new threads.

Best regards
igor

[ko-hey]

Hi igorpadykov‌

I made a new thread as below.

https://community.nxp.com/message/1081684 

Could you follow it ?

Ko-hey