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Original question:

BQ40Z80: BQ40Z80 communication failed

BQ40Z80: shutdown

fullymax_0807
Prodigy 30 points
Part Number: BQ40Z80

Hello. Can BQ40Z80 enter/exit shutdown mode frequently?

I want to send shutdown instruction to BQ40Z80 when the MCU goes into hibernation. This will happen very frequently.

Thank you!

  • 0
    TI__Guru 52115 points

    After the bq40z80 goes into the SHUTMODE, it will not perform current, voltage and temperature measurement anymore. Besides, 

    to wake up the device, a voltage must apply to the PACK pin.

    I would suggest you check first whether the SLEEP mode can meet your requirements.

    Aso, check more details mentioned in the TRM about the SHUTDOWN mode.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Prodigy 30 points

    SLEEP mode cannot satisfy the power requirement.  When bq40z80 in SLEEP mode, the MCU will also sleep, without reading the current, voltage and temperature.

    Besides,  the circuit has the function of activating devices.  When the MCU is awakened, it activates the bq40z80  through a voltage.

    The device will "shutdown->wake up -> shutdown->wake up" and so on . I'm not sure  if  this operation is risky for the bq40z80.

  • 0 in reply to fullymax_0807
    TI__Guru 52115 points

    BQ40z80 tracks the battery even in the SLEEP mode.  The scenario you mentioned is not the common case.  Usually, the gauge device is sent to SHUTDOWN mode before shipping.

    The BQ40Z80 device goes through a full reset when exiting from SHUTDOWN mode, which means the device will reinitialize.

    I think you can have a try and see what happens.

    Andy