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BQ34Z100: Schematic review

Samo Smodiš
Prodigy 190 points

Part Number: BQ34Z100
Other Parts Discussed in Thread: BQ76952, BQ25756, TPS26750, BQSTUDIO, USB2ANY

Hi everyone!

I would greatly appreciate a schematic review from TI experts for the BQ34Z100 Fuel gauge IC. 

The application is a BMS + USB PD Charger on the same PCB. The BMS IC is BQ76952 and the charger is BQ25756 + TPS26750.

Application requirements:

  • Must accept a li-ion battery pack 13s2p 32.5~54.6 V.
  • Must be able to charge the pack with max USB-PD of 240W.
  • Must be able to source all USB-PD up to 240W.
  • Must be able to communicate with external MCU via CAN.
  • Charging must be enabled only in the temperature range of 0~60°C.
  • Minimal cell balancing current of 40mA.

The circuit is designed such that there is a MCU which communicates to the BMS IC BQ76952, fuel gauge BQ34Z100 and USB PD TPS26750 via I2C to monitor the state of ICs and set their registers.
This MCU also communicates to an external MCU via isolated CAN to give status information.
I have debug connectors for the MCU, the BMS I2C bus and the charger I2C bus.
I plan to use the USB2ANY adapter during development to connect to the BMS BQ76852 IC and charger BQ25756 + TPS26750 ICs to monitor the state and configure the registers with the BQStudio software.

Please let me know your comments related to the BQ34Z100 or any other aspect of the design. I will appreciate everything that can help me improve.

I am attaching a PDF of the schematic and a .zip of the Altium project.

Thank you all for the help and comments!

Samo

260105 SCH v01.pdf 

260105 BMS V01 TI e2e.zip 

  • 0
    TI__Mastermind 49305 points

    Hello,

    This question has been assigned within the team and will be reviewed and followed up with a application engineer when possible.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 31845 points

    Hi,

    Regarding only the BQ34z100.

    There is no thermistor on the TS pin. Ideally the thermistor should be placed on the cells.

    SCL/SDA lines need pull ups (they are probably somewhere off the schematic.

    Assigning this thread to BMP to help review the BQ76952.

    Regards,

    Diego

  • 0 in reply to Diego
    Prodigy 190 points

    Hi Diego,

    Thank you for your comments!

    Is a thermistor necessary for the functionality of the fuel gauge? I have two thermistors in the battery pack, one is connected to the BQ76952 IC and the other is connected to the BQ25756 charger IC to adjust the charging current based on the temperature.

    That you for pointing out the pull-ups, yes they are on another schematic sheet.

    Regards,

    Samo