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TPS659037 custom power sequence

Keith Nicholas
Mastermind 46870 points
Other Parts Discussed in Thread: TPS659037, TPS65086

Hello,

Is it possible to use the TPS659037 for custom voltage/sequence configurations by using I2C commands to overwrite the OTP reset values before the rails are enabled?  Or does the part always enable the output rails at power-on-reset before the user can update voltage levels over I2C?

Thanks,
Keith N.
AFA OH/wPA

  • 0
    TI__Genius 16410 points
    Hi Keith,

    It's not possible to write a custom sequence to the device using I2C. The device always uses the pre-programmed power-up sequence and boot voltages, there is no way to overwrite that. Only after the device is booted up and in the ON state can you start writing to the device to change its dynamic settings.

    Regards,
    Karl
  • 0
    TI__Genius 13567 points
    It's possible for the TPS65086 to do this. It has I2C available as soon as VSYS has power and a 3.3V always-on LDO to power the MCU. The TPS65086 is designed to support an "embedded controller" (MCU) that does system management instead of the main application processor.
  • 0 in reply to Ahmad_Rashed
    TI__Mastermind 46870 points

    Thank you!

    The TPS65086 was under consideration as well, but at this point, I think the decision has been made to just use separate POL's with an embedded MCU to control sequencing.

    I will definitely keep this part in mind for the next power system that needs custom sequencing.

    Regards,
    Keith