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bq34z100 Sleep Mode

Lois Gray96
Prodigy 175 points
Other Parts Discussed in Thread: BQ34Z100

Four questions about bq34z100 in Sleep (not Full Sleep) mode:

1. How often is auto-calibration done, and does data flash get written on each auto-cal?

2.  Is it possible to increase the time betwee auto-calibrations, and if so, how can I do this?

3. Is it possible to completely turn off the auto-calibration in sleep mode, and if so, how can I do this?

4. If auto-cal is turned off, is it possible to force a calibration through the I2C (after gauge has been woken)?  How?

  • 0
    TI__Guru 73830 points

    Lois,

    The CC Offset will get written to flash when it is updated by autocal. I am not aware of a method disabling autocal form occurring in Sleep mode. You can run a CC Offset calibration using MAC commands. Search for the SLUA640 document on the TI website.

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 175 points

    Hello Thomas,

    Thanks for quick reply and slua640 is useful info.  Would it be possible to get information on how often the flash is written automatically or what triggers an autocal in both Sleep and Full Sleep modes?  My concern is that flash is only specified for 20000 writes (from datasheet minimum) and we have had instances of other fuel gauges (not this type) failing due to excessive autocal writes.

    Regards

    Lois

     

  • 0 in reply to Lois Gray96
    TI__Guru 73830 points

    Lois,

    The flash memory is updated after lifetime parameters are changed, Ra and Qmax parameters are updated, calibration parameters have changed. The device should only run autocal and update the flash if the Vsr > Deadband. They also have a time requirement that prevents it from running if it has updated within the past 10 hours.

    Tom