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BQ35100: SOH mode questions

Takeshi Sasaki
Expert 4480 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO

Hi team,

Could you give me comment on following customer questions? The customer tries to use BQ35100 to monitor the rest of the battery life, and when the battery reaches to the end of the life, BQ35100 sends alarm signal to the host controller. For such use case, the primary battery will be Li-MnO2 and CR type.

Q1. When the battery discharges rarely because the battery operates only when the main supply goes shutdown, can SOH mode be used to estimate the rest of battery life? Or should coulomb counting be used instead?

Q2. For the output of alarm, the customer assumes it is determined after checking the lookup table inside the chip if it is normal or fault. For that case, does the customer need to calibrate the determination threshold of the alarm depending on the battery materials and supplies by themselves? If so, could you tell me how to do that?

Best regards,

Takeshi Sasaki

  • 0
    TI__Guru** 105740 points

    Hello Takeshi,

    1)

    If they are planning to use Li-MnO2 the mode that works best for that chemistry is SOH mode, but you can use either.

    2)

    The output of the alert interrupt can be configured using chapter 8 of the TRM. You will need to configure thresholds in bqStudio depending on then you want the alert to be set. Once you upload the battery chemistry and calibrate the gauge you wont need to calibrate the threshold, just input it with bqStudio.

    Sincerely,

    Wyatt Keller