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BQ34z100-g1 alert signal not working after disconnecting and reconnecting battery

Alexandru Marcus
Prodigy 35 points
Other Parts Discussed in Thread: BQ34Z100

Dear Sir / Madam,

 

We are using the alert signal to turn off our load when the battery voltage drops below a set level.

Only the BATLOW register is used to trigger the alert signal.

Alert configuration 0x1000

LED configuration 0x00

Cell BL set volt threshold 2750

Cell BL set volt time 2

Cell BL clear volt threshold 3500

The gauge works until we remove the battery. After reconnecting the battery alert signal is gone.

Cycling the battery, resetting the device, recalibrating, sending different commands does not help.

The only method that worked was writing the standard firmware and then overwriting it with a saved golden image.

The battery is not connected during shipping. Is there a simpler way to activate the Alert signal without rewriting the Firmware?

Thanks,

Marcus

  • 0
    TI__Guru 73830 points
    I found the ALERT output to return to the active (low) state after power is returned to the device. Can you send an srec file from the device and I wil try your setup.
  • 0 in reply to ThomasCosby
    Prodigy 35 points

    I found a way to turn the Alert signal on P2 on again after disconnecting the battery.

    Writing 0x02 to LED_Comm Configuration, followed by reset command and then 0x00 to LED_Comm Configuration and the Alert signal is active again on P2.

    It could be that P2 is not set as output and switching to 4LED configuration and restarting sets the 4pins as output.

    I am currently using bq34z100_G1_v0_16_build_17 firmware for testing the device.

    I will try the firmware shipped with the device and others that I can download.

    As soon as new bugs are found I will update my post together with solutions if I find any.