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BQ40Z50: query about power accuracy

Lidong Yu
Intellectual 1756 points
Part Number: BQ40Z50
Other Parts Discussed in Thread: GPCCHEM, GPCRB

Hello:
      I am using TI’s BQ40Z50 chip for a notebook computer. I have followed the steps on the official website to perform room temperature and low temperature LOG data, and I have also performed fuel gauge Golden Learning, and the learning is successful, Update Status = 0x0E. However, in actual use, customers reported that my power accuracy could not meet the requirements, such as the charging that the RSOC jumped from 0 to 3% at the beginning of charging, and there was a dropped from 46% to 45% once during the charging process.
I saw TI’s instructions say that users can send batteries to TI’s custom ID, and need to contact TI’s FAE first. How can I contact to get help? My customer needs to work in three temperatures of 0°C, room temperature25°C, and high temperature 45°C, and the power cannot have a jump of more than 2%，And no battery is allowed to fall back during the charging process。
Thank you!

  • 0
    TI__Intellectual 2146 points

    Hi Lidong,

    It's likely not an issue with the cell characterization, unless the GPCCHEM tool reported a mismatch of more than around 3% deviation. For better device accuracy in more extreme temperature ranges, use our GPCRB tool. That should alleviate some of the jumps and drops that you're seeing. You may also want to look into the smoothing functionality of the device to prevent those jumps and drops.

  • 0 in reply to Albert Anwar
    TI__Intellectual 1756 points

    i was used to use GPCPB tool test it.

    1 But when i use 0.2C in the learning process when discharge, and the customer is using 0.5C -0.2C, is this cause 3% jump/

    2 i enable smooth=1, but DSC_0_SMOOTH_OK=0. should i change DSC_0_SMOOTH_OK=1?

    3 is the setting of registers "term smooth start cell V delta" and "erm smooth final cell V delta" been valid when DSG_ 0_ SMOOTH_ When OK = 1?

  • 0 in reply to Lidong Yu
    TI__Intellectual 2146 points

    Hi Lidong,

    1. Are you referring to the 3% jump when charging? If so then it's certainly possible.

    2. Setting DSG_0_SMOOTH_OK will depend on your application. If you are worried about jumps during discharge it may be a good idea to set it.

    3. These are both registers you would need to set when enabling discharge smoothing. The values for these again depend on your application.