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TPS65217 Full Power Cycle through I2C

Dan Cristy
Intellectual 2615 points

Hi Team -

We are looking to run a full power cycle through I2C, using  the SEQDWN bit. For power up, it says to "contact the factory."

If we were to use the SEQDWN bit to run the full power cycle, what else needs to be done for automatic start up?

Thank you,

Dan

  • 0
    TI__Expert 3740 points
    Daniel,

    When you do an actual power down, you don't do a full power down with the SEQDWN bit you are just simulating one, the registers are set back to their default value. So one would need to reprogram the memory in order for the device to boot up with a custom power up sequence. The SEQDWN bit is meant to help test alternate sequencing.

    Janice
  • 0 in reply to Janice Escobar
    TI__Intellectual 2615 points
    Hi Janice -

    Thanks for the quick response, I appreciate it.

    It sounds like we may not be taking the best approach to this then. If the customer wants to execute a full power cycle of the device, through I2C, what would your recommendation be to do this?

    I know that you can pull RESET pin low, so the customer was leaning towards connecting a GPIO and resetting the logic to do it through software.

    What are your thoughts?

    Thank you,
    Dan
  • 0 in reply to Dan Cristy
    TI__Expert 3740 points
    Dan,

    Do you have back up battery power in this application? You can either set the off bit in register A to 1 and pull PWR_EN low. That will force the device to OFF mode where it will wait for a wake up condition in order to move to WAIT_PWR_EN state, where it gives you five seconds to reassert the PWR_EN pin high. You can also do what you mentioned with the GPIO and the nRESET pin.

    Janice