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BQ34110: Usecase to control charger chip based on temperature algorithm

shashank pathak
Prodigy 40 points
Part Number: BQ34110
Other Parts Discussed in Thread: BQ25620, TIDA-01182

Hi All,

we are planning to use BQ34110 Guage IC in one of our project.

I was referring to datasheet and reference manual of BQ34110 but it is not clear from that whether the guage IC can be used to control the charging of a battery cell. There are many things related to monitoring part and status reporting that the chip support but how the pins VEN, ALERT1 and ALERT2 can be used to control any charging IC is not clear.

We might be using  BQ25620 as the charging IC.

Is it possible to connect thermistor to BQ34110 and use JEITA from it to control the charging IC BQ25620?

Please advice if there is any application note or reference available regarding the usecase.

Regards,

Shashank.

  • +1
    TI__Genius 12215 points

        Alert pins can be used to control ON and OFF of the Charge FET, but since you are asking using JEITA configuration to control charger, looks you would expect to control the charging voltage and charging current analogically, the best to implement such control is to have host to read the ChargingVoltage and ChargingCurrent from bq34110, then send the desired charging voltage and charging current command to bq34110. You can reference the block diagram of TIDA-01182 in https://www.ti.com/lit/ug/tiducl1/tiducl1.pdf

        

  • 0 in reply to Steven Yao
    Prodigy 40 points

    Thanks Steven.

    That helps a lot.

    I was also looking for reference example code for BQ34110 and BQ26620 but could not find it. Can you please guide me on this?

    Any reference note mentioning which registers should be used and how to write/read them using I2C would be also helpful.

  • 0 in reply to shashank pathak
    TI__Genius 12215 points

        There may not be such coincident file matching your expectation, however, the operation at gauge side is all similar, just read required charging voltage and charge current from the registers named as is, the difference may lies in how to control charger, you can find some document on how to control bq26620 register to control the actual charging voltage and charging current. I think this information shall also available in the charger's datasheet