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BQ27510-G3 golden file generation for dual cell Li-ion battery

Kavya MV
Prodigy 60 points
Other Parts Discussed in Thread: BQ27510, BQ27510EVM
Hi,
We are using BQ27510DRZR-G3 to monitor dual cell battery. Please find the schematics attached for your reference.
We want to generate the golden file using BQ27510 EVM. Kindly suggest the modifications required on the EVM.
Please find the battery specifications below:
Maximum Voltage: 8.4V
Capacity: 2000mAh
  • 0
    TI__Guru* 76230 points

    Hi kavya

    -C474 should be 0.47uF

    -can you explain what you are  trying to do with the SN74LVC1G34DRLR buffer? The pin BI/TOUT is used to determine when a battery is inserted or removed and also serves as a bias for the thermistor.

    -You have your gpout pulled pulled up to 3.3 V. is that a requirement of your host?

    -The gauge is a 1s gauge and support cells with voltages of  up to 4.4V. How do you plan to use it with an 8.4V dual cell?

    -See link below on how to generate golden image.

    http://www.ti.com/lit/pdf/slua544

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 60 points

    Hi Onyx,

    Please find my response inline

    -C474 should be 0.47uF
    [Kavya]: Will be implemented

    -can you explain what you are trying to do with the SN74LVC1G34DRLR buffer? The pin BI/TOUT is used to determine when a battery is inserted or removed and also serves as a bias for the thermistor.
    [Kavya]: SN74LVC1G34DRLR is used for level translating "BAT_INSERT" to 3.3V.

    -You have your gpout pulled pulled up to 3.3 V. is that a requirement of your host?
    [Kavya]: Yes

    -The gauge is a 1s gauge and support cells with voltages of up to 4.4V. How do you plan to use it with an 8.4V dual cell?
    [Kavya]: We have used a voltage divider with unity gain operational amplifier (TLV27L1IDBVR) to buffer the output of resistive voltage divider. We refered SLUA387 application note.

    We want the hardware changes required on the BQ27510EVM to connect a dual cell battery.

    Thanks,
    Kavya M V

  • 0 in reply to Kavya MV
    TI__Guru* 76230 points
    Hi Kavya,
    Why does the customer need to level translate the 2.5V which the gauge sees when a battery is not inserted? What's the reasoning behind adding the level translator? The gauge will be looking for 2,5V and not 3.3V.

    You will have to do the same to the evm, i.e add the unity gain opamp to use the EVM with a dual cell battery.

    thanks
    Onyx