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BQ27Z561-R2: bq27z561-R2-What are the implications of disabling the guage while the devices sleeps? Other options to minimize discharge.

craig
Intellectual 510 points
Part Number: BQ27Z561-R2

Tool/software:

Hello, 

Currently implementing a low power design utilizing the bq27z561-r2 guage. Due to power savings the hardware teams desires to disable the gauge while sleeping. The device will be sleep 99% of the time, with potential for 100% sleep during storage.

Targeting a sub 5uA of sleep mode current. 

sub 100mA for wake state

What are the implications of disabling the guage while in sleep mode? Any other options to consider (I know the guauge has sleep capabilities)?

Would it be possible to update the discharge/capacity given a computed sleep discharge estimated from pre-measured sleep current and time in sleep mode?




Thanks,

Craig

  • 0
    TI__Mastermind 24931 points

    Hello Craig, 

    Sending the gauge into sleep mode during normal operation should be fine. I would not recommend to completely turn off the gauge during normal operation. The gauge has low power modes integrated for this purpose, when there is a current greater than the sleep current, the gauge can wake from these low power modes automatically. 

    Regards, 

    Robert. 

  • 0 in reply to Jonny
    Intellectual 510 points

    Robert, 

    Can you elucidate further-What are the implications beyond missed discharge while off? 

  • 0 in reply to craig
    TI__Mastermind 24931 points

    Hello Craig, 

    If the gauge is off and there is some discharge, then the gauge will not track this passed charge and there will be an SoC jump when the gauge turns on. 

    Regards, 

    Robert.