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Original question:

BQ76942: MOSFET Driver Fails

BQ76942: Exit Deep Sleep Config

Sean Chan1
Prodigy 150 points
Part Number: BQ76942

Hi Matt,

For BQ76942, when I want to exit Deep sleep mode, I just need to send exit cmd  or pull up reset-shut pin for about 500us, then I config the alarm enable bits and disable sleep. Everything runs good.

But when I shift to BQ7694202, I have found after I pull up reset-shut pin for about 500us, setting alarm enable bits fails, and I can not read the correct current value, while the voltage and temperature value is true. And at this moment the voltage of the battery is about 28.5V.

Besides CRC, Is there any difference between BQ76942 and BQ7694202?

And how to guarantee the robustness of operation of BQ7694202?

  • 0
    TI__Guru* 81034 points

    Hi Sean,

    The only difference between the BQ76942 and the BQ7694202 is that the REG1 regulator is enabled to 3.3V and CRC is enabled. They should be identical for entering and exiting DEEPSLEEP. I just tested exiting DEEPSLEEP on my board with the BQ7694202 and it works okay.

    Are you sure you are waiting long enough after exiting DEEPSLEEP before reading the measurements?

    Best regards,

    Matt