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BQ79616-Q1: Low-power measurement cycle duration

Simon Oettle
Prodigy 20 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616

Hello,

I am wondering how quick the BQ79616 (or BQ79612 variant) can wake up from sleep, take all cell measurements, send them to external MCU.

All I found in your datasheet is the time it takes to wake up from sleep and go from active to sleep, but I am a bit confused with the parameter tAFE_SETTLE. Does this parameter mean I have to wait the analog front end settling time until I can do measurements after waking up? If so, what does the stated tSU(SLP2ACT) mean?

Kindest regards,

Simon Oettle

  • 0
    TI__Genius 17370 points

    Hi Simon,

    For a single device (time depends on how many devices are stacked in daisy chain), and it will be different if you mean from shutdown or sleep. From shutdown you need to consider tsu(wake_shut) + afe_settle + time to transmit the commands to start ADC and then read back and receive depending on # of data bytes to read whereas sleep you just need to consider tsu(slp2act) + afe_settle +  time for commands...

    Regards,

    Taylor                                                                                                                                                                

  • 0
    Prodigy 20 points

    Hi Taylor,

    If I have understood correctly, the BQ is already considered "active" during AFE settle time after waking up from sleep and therefore draws as much current as in active mode during AFE settle time. Is this correct?

    Regards,

    Simon

  • 0 in reply to Simon Oettle
    TI__Genius 17370 points

    Hi Simon,

    Not sure I understand what you mean exactly, but any time after sleep 2 active tone or wake up is considered active mode as opposed to sleep/shutdown state. So afe settle would occur initially after transition to active mode.

    Regards,

    Taylor