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BQ25792: BQ25792: From write SDRV_CTRL field to 0b10 to ship FET is turned off, how long does it take ?

Star Xu
Genius 9645 points
Part Number: BQ25792

Hi 

The customer design with BQ25792, the circuit has a ship FET, and the field SFET_PRESENT in REG14 has been set to 1. The field SDRV_DLY in REG11 =1, so don't add 10s delay.

My question is, from MCU write SDRV_CTRL field  to 0b10, to ship FET is turn off, how long does it take ?  Once the write successfully, the ship FET is turned off, and the MCU is power down.

Is there enough time for this I2C write instruction to completed execute successfully? 

Waiting for your reply.

Thanks

Star

  • 0
    TI__Guru*** 143880 points

    Hi Star,

    Yes.  The turn off delay is longer than the I2C transaction. I do not have an exact time because it is difficult to measure due to not being able to place a scope probe on SDRV and the turn off delay of the FET itself.

    Regards,

    Jeff