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TPS659037: Is the I2C interface required to use the PMIC with AM571x processor?

David M. Alter
Guru 61235 points
Part Number: TPS659037

A customer is using TPS659037 with AM571x processor.  Assuming they are not using the ADC or GPIO on the PMIC nor the DVS, does the I2C interface (e.g. I2C1) need to be connected to the processor?  Are there configuration settings that must be modified by the processor via I2C in order for things to work correctly?

Thanks and regards,

David

  • 0
    TI__Genius 10000 points
    David,

    The user guide of the TPS659037 and AM57xx: www.ti.com/.../sliu011

    If they are not using the ADC, those pins can be grounded. The user guide describes how each GPIO is configured by default. For the GPIOs, they are not configured as I2C1, so you do not need to connect them to the processor.

    Thanks,
    Nastasha
  • 0 in reply to Nastasha
    TI__Guru 61235 points
    Thank you for your response Natasha. The question wasn't so much what to do with the unused ADC and GPIO pins, but rather does the user need to connect the I2C to the processor? Is there something that must be done via I2C in order for the PMIC to function correctly with the AM571x, or is there something other than the ADC, GPIO, and DVS that cannot be used without the PMIC connection?

    Thank you,
    David
  • 0 in reply to David M. Alter
    TI__Genius 10000 points
    David,

    Without I2C, the device will power up, but the usage of the device is limited. You will not be able to receive interrupts (such as short circuit detection), or information from any GPIOs. You will also not be able to change any voltages, generate a warm reset, etc. If you do not require any communication between the processor and PMIC (other than power), then you may not need I2C.

    Thanks,
    Nastasha