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bq34z100G1 question

Doug Baker
Genius 3420 points
Other Parts Discussed in Thread: BQSTUDIO

I have a bq34z100G1 EVM kit hooked up to a 12 V battery pack that I miss calibrated the voltage by a factor of 10.  I am using the latest version of bqstudio and I can communicate with the bq34z EVM with no problem. 

I should have put in 13000 mV when I calibrated the voltage I put in 1300 mV by mistake.  I am not able to change any flash values because I assume the part thinks the voltage is too low (1.3 volts).   I did try to re calibrate the voltage but I get an error "Calibration - Failed to enter calibration mode with command 0x2D" when I try to calibrate anything including the voltage or temperature etc.

Any advice to fix this? 

Thanks,

Doug

  • 0
    TI__Mastermind 25955 points
    Hi Doug,

    The fastest way to fix this is to start fresh. Program the device with a SREC you have saved prior to putting in the incorrect value.

    If that SREC doesn't exist, please program the device with the default SREC, found here: www.ti.com/.../sluc580

    If the battery will never reach a state of < 3 V, set Flash Update OK Cell Volt = 0 to prevent this from occurring again during development.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Genius 3420 points

    After re flashing the firmware, I can now change the data flash values. 

    When I try to do the calibration, the instructions say to measure the voltage from BAT+ to BAT- and enter the value.  The voltage I measure there is 13.19 volts since the BQ is across a battery pack.  The calibration does not allow me to enter 13190 mv.  I get an error that the voltage value is out of range.

    It is my understanding that I need to enter the values for the  pack even through the pack is 4S 5P

    Doug