PMIC_ON_REQ is Open drain or not

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PMIC_ON_REQ is Open drain or not

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ko-hey
Senior Contributor II

Hi all

I want to know whether PMIC_ON_REQ is open drain or not.

I would like to control PWRON of PMIC in two ways from another device.

One is PMIC_ON_REQ and the other is other external device.

According to the SDB schematic, PWRON is connected with PMIC_ON_REQ and PMIC_PWRON.

I think the PMIC_PWRON is Open drain so there is no problem.

However, there is no description that whether PMIC_ON_REQ is Open drain or not.

Is the PMIC_ON_REQ also Open drain ?

If yes, please let me know where I can find the description.

Ko-hey

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

yes it is open-drain please refer to part of datasheet

1.jpg

Best regards

igor

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

yes it is open-drain please refer to part of datasheet

1.jpg

Best regards

igor

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otsl
Contributor I

I have a similar question regarding the PMIC_ON_REQ configuration on the i.MX7D Sabre board.

It seems to be the same (PMIC PWRON is driven by both i.MX7D PMIC_ON_REQ as well as an open-drain PMIC_PWRON signal from a supervisor IC).

Is the PMIC_ON_REQ on the i.MX7D also open-drain? I ask, because it is not specified in the datasheet, and in the hardware development guide for the i.MX7D it says that PMIC_ON_REQ is a push-pull output:

otsl_0-1611693950340.png

If this is true, then whenever the supervisor IC pulls PMIC_PWRON low, it would be in contention with the i.MX7D push-pull output.  Can you please clarify this?

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Yuri
NXP TechSupport
NXP TechSupport
Spoiler
 

@otsl 
Hello,

  the issue was already discussed in 

  https://community.nxp.com/t5/i-MX-Processors/about-PMIC-ON-REQ-pin-on-i-MX7-Dual/m-p/1153390

 

Regards,
Yuri.

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ko-hey
Senior Contributor II

Hi Igor

The datasheet which you showed is for i.MX6D/Q. But I use i.MX6SoloX.

Is it same as i.MX6SoloX ?

Ko-hey

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

yes. i.MX6SoloX was developed from i.MX6Solo.

Best regards

igor

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ko-hey
Senior Contributor II

Hi Igor

Thanks.

Can I request the description to NXP by TIC ?

Ko-hey

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ko-hey

if you have special reasons, please escalate this through local fae channel.

Note you will have to submit customer project info and (probably)

have valid NDA with nxp.

Best regards

igor

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ko-hey
Senior Contributor II

Hi Igor

Thanks you !

Ko-hey

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