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BQ40Z50-R2: BQ40Z50 External RESET Function Inquiry

Tom Tsao
Expert 1850 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

Tool/software:

Dear TI Support Team,

We would like to inquire about the RESET function of the BQ40Z50.

  1. Does the BQ40Z50 support an external trigger function for RESET? We are concerned that if the firmware crashes, we will be unable to control CFET and DFET via the Gauge. Therefore, we are considering implementing an external RESET function to reset the BQ40Z50 when it becomes unresponsive. Could this function be achieved through the SHUTDN pin, or do you have any recommendations for implementing this feature?

  2. Is the detection of the SHUTDN pin based on firmware?

We appreciate your support and look forward to your guidance.

Best regards,

  • 0
    TI__Mastermind 28470 points

    Hi Tom,

    The detection of the high-to-low transition for this functionality is reliant on the firmware. Are you actively seeing firmware crashes on this device?

    Regards,

    Anthony

  • 0 in reply to Anthony
    Expert 1850 points

    Hi Anothony,

    We are not currently seeing any firmware crashes on this device. Since this battery product is used in the human body, they are making all worst-case considerations. In the event of a BQ40Z50 failure, they hope to have a hardware circuit that can either reset the BQ40Z50 when it crashes or ensure that the MOSFET is disconnected. Could you provide some circuit recommendations for this?

    Thanks!

  • 0 in reply to Tom Tsao
    TI__Mastermind 28470 points

    Hi Tom,

    If there were to be a firmware crash and a reset needed to be completed, this would have to be done by completing a power on reset where the device is fully removed from the power connection. Our typical recommendation for this would be to remove the cells from the system.

    Regards,

    Anthony

  • 0 in reply to Anthony
    Expert 1850 points

    Hi Anthony,

    Does this mean removing the power from the BAT pin?

    Thanks!

  • 0 in reply to Tom Tsao
    TI__Mastermind 28470 points

    Hi Tom,

    Yes, this means removing power from BAT, along with power to the VCC and PBI pins since these are also power connections.

    Regards,

    Anthony