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Is it possible to take control of VBUS_EN_SNK pin from software using i2c on STUSB4500?

RHo.1
Associate II

‎2021-01-11 08:44 AM

 
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4 REPLIES 4
Winfred LU
ST Employee

‎2021-01-11 09:48 PM

GPIO pin can be used for application specific purpose.

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RHo.1
Associate II
In response to Winfred LU

‎2021-01-12 08:35 AM

Thanks for the reply @Winfred LU​. The GPIO pin is already being utilized elsewhere in my application.

I want VBUS_EN_SINK pin to act as an on/off switch.

Software control from main mcu using i2c would allow me to override and take control of it... is this possible?

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Winfred LU
ST Employee
In response to RHo.1

‎2021-01-12 05:48 PM

Not possible as far as i understand.

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RHo.1
Associate II

‎2021-01-13 12:50 AM

I might have a hack for this...

  1. enable Power Above 5v Only.
  2. explicitly tell STUSB4500 to negotiate PDO1... and ignore PDO2 & PDO3.

@Winfred LU​ Will the above sequence work to disable power? If yes... can this be performed dynamically?

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