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BQ40Z80: Temperature mode disabling regarding

Mohan Raj
Prodigy 200 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO

Hello Team ,

I am using Bq40z80 for my custom board , there is no temperature sensor , so i just made the Temperature enable configuration as 0 and Temperature mode made it as 0.

Let me know with this configuration is there any other condition will fail in my BQ bpard. understood that OTD won't detect as part of safety alert.

Could you please help me to understand more drawback with this configuration.

Regards

Sachu

  • 0
    TI__Guru** 102355 points

    Hello Sachu,

    If you are doing any high rate discharges or charging with your battery that causes the cell temperature to change, not having TS connections to the cells will lead to accuracy issues with the SOC, RemCap, FCC, etc. If the discharges are low and the battery is almost always at the same temperature as ambient temperature so the gauge uses the internal temperature sensor it should be okay to do this configuration with no TS inputs for cell temperatures.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Hello wyatt ,

    Thanks for your reply. As per your suggestion the no TS configuration will only affect the accuracy issue.

    i just changed the TS configuration , and trying to read the remaining capacity through the bqstudio , getting the response as 0x0000.

    let me know why i am getting the remianing capapcity value as 0 . when i am changing  TS2 Enable configuration  the remining cpapcity reported as zero.

    Could you please help me to find out the exact issue.

    3225.cell_export.gg.csv

  • 0 in reply to Mohan Raj
    Prodigy 200 points

    The full charge capacity and remianing capacity all the parameters went zero , only the chnage temperature mode changed to zero

  • 0 in reply to Mohan Raj
    TI__Guru** 102355 points

    Hello Mohan,

    You cannot change the gauge to use a TS pin that is not connected, it will report -273 degC which will force all gauging results (RemCap, FCC, SOC, etc) to 0 since the gauge is calculating an extremely high resistance for the cells due to the incorrect temperature input selection you have made. IF you are not using TS pins you must use the internal sensor.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Hello Wyatt,

    Thanks for your reply , can you please tell me how can I configure internal sensor , if I am not using the TS pin in order to avoid the the gauging result report zero.

    please tell me  which configuration I need to change in bqstudio for selecting internal temperature

    please help me

  • 0 in reply to Mohan Raj
    TI__Guru** 102355 points

    Hello Mohan,

    All information can be found in the TRM, please disable all TS inputs except TS int: Settings:Temperature Enable[TS4][TS3][TS2][TS1][TSInt].

    Using the internal temperature sensor will still lead to issues with gauging if the TS internal sensor isn't close to the actual battery temperature.

    Sincerely,

    Wyatt Keller