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Linux/TPS65217: How to stop PMIC from searching for the Power source. (Turn On Device only on Push Button)

Part Number: TPS65217


Tool/software: Linux

Hi,

I'm facing an issue with the PMIC TPS65217,

When only USB is connected to the beaglebone black, and Push Button is pressed then device shutdown and power is cut. (OFF Mode)

When only AC Power Source is connected to the beaglebone black, and Push Button is pressed then device shutdown and power is cut. (OFF Mode)

When USB and AC Power Source both are connected, then the device shuts down and after 1Second it will start powering up again. (OFF Mode & then it is waking up)

I want to know is there any way by which I can stop the PMIC from searching for the power sources connected ?

Can I make only PushButton event as the only wake-up event ?

  • Hi Moses,

    thank you for your interest. I have forwarded your request to our product expert, to look at it.

    Thank you
    Kevin
  • Moses,

    I believe you are running into an issue that is described clearly in the TPS65217 datasheet on page 28:

    "The linear charger periodically applies a 10-mA current source to the BAT pin to check for the presence of a
    battery. This current application causes the BAT terminal to float up to > 3 V, which may interfere with AC
    removal detection and the ability to switch from the AC to the USB input. For this reason, it is not recommended
    to use both the AC and USB inputs when the battery is absent."

    You can try shorting the BAT_SENSE pin to the BAT pins on the Beagle Bone Black board to resolve the issue. If this does not help, then there is nothing that can be done without using an actual battery.

    There is no way to use the Push Button as the only wake-up event. The Push-Button input is designed to ONLY be a wake-up event when a battery is inserted. Forcing the end user to press the push-button instead of automatically waking up saves battery power.