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TPS6590376 power on request

Logan Lin
Intellectual 340 points

HI Sirs

 

Our customer found out that when they insert the DC-jack, the PMIC will turn on automatically,

 

But their schematic is the same as EVM board, POWERHOLD pin is pull low, and PWRON connect to a switch shorts to GND.

 

So I’m confused about this situation, is the firmware can control the power on request?

  • 0
    TI__Genius 16410 points
    Hi Logan,

    We are already discussing by e-mail, but I want to put the answer here for other people who might search this.

    There are 4 ways to turn on the PMIC, listed in the ON request section of the datasheet.
    www.ti.com/.../detailed_description

    The customer should check that none of these are being met. I recommend measuring POWERHOLD and PWRON/RPWRON if possible.
    Note that an RC on PWRON pin could cause a delay so that PWRON is low while 3.3V is applied to the PMIC.

    For the interrupts, the customer can read the INTx_STATUS registers to see if there are any pending interrupts. If there are, check Table 5-6 in the datasheet to see if any of those could be generating the ON request.
    www.ti.com/.../detailed_description

    Regards,
    Karl