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BQ25121 Reset and OTP

Kavin Muthuvelu83
Prodigy 70 points
Other Parts Discussed in Thread: BQ25121

Hi,

We were designing a wearable with BQ25121. The device outputs 2.5V at startup and is then programmed to 3.0V on the run.

In case we reset the device with MR#, or the device gets down when the battery is completely drained, does the device needs to be re-programmed to output 3V on next power up/ start up after reset?. In datasheet, was the default OTP setting refer to default register setting to 2.5V, that is programmed at factory?..Please let us know

  • 0
    TI__Genius 12485 points
    Kavin,

    I believe there is some confusion on the reset function. The reset through /MR pin will pull-down the Reset line which if connected to your MCU, will cause it to reset. We will hold the value until altered over I2C. It is not a reset to our device but a reset to your MCU if desired. Yes the 2.5V is programmed at our factory.


    Regards,
    Gautham
  • 0 in reply to Gautham
    Prodigy 70 points

    Hi Gautham,

    Thanks for the clarification.

    Can you let us know the occurrences when the I2C register setting for desired output (3.0V) rather than factory programmed setting, will be lost.

    Regards

    kavin