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TPS65217CEVM: TPS65217CEVM:

Part Number: TPS65217CEVM

I have a project refer to Beagle Bone green wireless PMIC is TPS65217C MCU is AM335X, from now on, measure the power on sequence find WEAKUP signal measure is normal Lo, check specification this signal is normal hi, but my project show is normal Lo, I had check the schematic & component is same as EVM board, I didn't have any idea for debug, anyone could help me for this issue. the PMIC order No. is TPS65217CRSLT

  • Hi Mickey,
    please let me confirm I understand your setup correctly:
    You are using a beagle-board and a stand-alone TPS65217CEVM to power it.
    You wonder about the WAKEUP signal and whether it should be high or low?
    This pin is an active-low, open-drain output. The EVM has a pull-up resitor R13 to V3P3. Please verify V3P3 is supplied.
    Please also refer to section 8.3.4 of the datasheet and respective reverence herein:
    The nWAKEUP pin is an open-drain, active-low output that is used to signal a wakeup event to the system host.
    This pin is pulled low whenever the device is in the OFF or SLEEP state and detects a wakeup event as
    described in the Device Functional Modes section. The nWAKEUP pin is delayed for 50 ms over the power-up
    event and stays low for 50 ms after the PWR_EN pin has been asserted. If the PWR_EN pin is not asserted
    within 5 s of the power-up event, the device shuts down and goes to the OFF state. In the ACTIVE state, the
    nWAKEUP pin is always high.
    --> does the Beagle-board assert the PWR_EN within 5s?
    I hope this answers your query, please let us know if I misinterpreted your issue.
    Best regards,
    Frank
  • The power-on sequence between the processor and the PMIC is a low-level digital handshake. The most important steps are listed below:

    1) AC, USB, or BAT power applied (Push-button press required for BAT wake-up)
    2) SYS and LDO1 rails turn on
    3) PMIC pulls nWAKEUP low
    4) Processor sets PMIC_POWR_EN high (PWR_EN pin on the PMIC)
    5) all PMIC rails come up
    6) PMIC sets PGOOD high

    NOTE: if any of these events do not occur within the allotted time, then a timer will expire and the PMIC will sequence down to turn off the processor.