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BQ34Z100-R2: MCU requirements to handle BQ34Z100-R2+BQ76972

SAERO
Prodigy 196 points
Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ76972, TIDA-010030, BQ7718, BQ76200, BQ34Z100

Tool/software:

Hello,
We are planning to use BQ34Z100-R2+BQ76972. Is MCU mandatory on BMS for this kind of setup to work? If yes, what are the tasks the MCU must handle? We want to choose low power MCUs for this and wondering what are the options that are available with CAN interface.

 
TIDA-010030 uses a external FET driver. Is it required for BQ76972? We are planning to skip using BQ76200 and BQ7718 from this. Is that okay?

Thank you!

  • 0
    TI__Genius 12775 points

    Hi,

    An MCU is required to configure the gauge. The MCU is not needed for gauge the SOC of the battery. The BQ34z100 does not support CAN communication.

    I am unfamiliar with the BQ76972, I will assign this thread to someone from the mointor team to answer that questions.

    Regards,

    Evan

  • 0 in reply to Evan
    Prodigy 196 points
    Evan said:
    An MCU is required to configure the gauge. The MCU is not needed for gauge the SOC of the battery. The BQ34z100 does not support CAN communication.

    Can only BQ34Z100 I2C be used as main interface for communication? I think the BQ76972 needs OTP done for this? 
    Possible to elaborate on what configurations MCU needs to handle? 

  • 0 in reply to SAERO
    TI__Genius 16770 points

    Hi,

    The BQ76972 can operate as a standalone monitor and protector and does have integrated high side FET drivers. The only caveat to this is that you will need to write the OTP of the BQ76972 on the production line to allow it to act in standalone mode with the settings that you want. An MCU to configure the BQ76972's settings on startup is the typical solution that we see.

    I'll let the gauge team comment on the BQ34Z100's capabilities.

    Regards,

    Max Verboncoeur

  • 0 in reply to Maxwell Verboncoeur
    Prodigy 196 points
    Maxwell Verboncoeur said:
    An MCU to configure the BQ76972's settings on startup

    What is considered as startup? WAKE from shutdown mode or sleep? I assume AFE will keep monitoring in sleep?
    Thank you!

  • 0 in reply to SAERO
    TI__Genius 16770 points

    Hi,

    Any wake from shutdown mode is considered startup. Correct, the AFE continues to monitor at a lower rate during sleep mode to reduce power consumption.

    Regards,

    Max Verboncoeur

  • 0 in reply to Maxwell Verboncoeur
    TI__Genius 12775 points

    Hi,

    Regarding the BQ34z100, You can communicate with this gauge via I2C or HDQ. 

    Regards,

    Evan