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TPS65218: Power up problem

Xiao Zhu2
Expert 3215 points
Part Number: TPS65218

Hello Team

My customer is using TPS65218.  Attached is their schematic. 

Question： if the customer want to only go to default state（each output is the default set, how to set up the PWR_EN, PB and AC_DET?

 if no change and I2C write, the ouput will disable. How to go to active mode at the condition of the schematic set?

Schematic1 (2).pdf

  • 0
    TI__Genius 9615 points
    Hello Xiao,
    Just to clarify, is your customer experiencing issues with the default configuration?
    Please see flow-chart on page 47 of the datasheet:
    PWR_EN should be high ... correct (as long as the 3.3V is supplied by an external source.
    PB should be low ... but seems to be pulled high?
    AC_DET should be low ... correct
    nWAKEUP should be low ... but seems to be pulled high?

    Please double-check these configurations. I also assigned this thread to the product expert for further support.

    Best regards,
    Frank
  • 0 in reply to Frank Dehmelt
    TI__Expert 4155 points
    Hello Xiao,

    I have double checked this and I believe your schematic is correct.

    PWR_EN = high
    AC_DET = low
    PB = high

    This will turn the device on with all of the default values as determined by their OTP as soon as power is connected. The only exception is DCDC3 & 4 which are programmed to 1.35V & 3.3V respectively using the 12.1kohms (so I am assuming this is using DDR3L memory).

    Thanks,
    Nick