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BQ25150: Can BQ25150 be used as gauge to achieve SOC 1% accuracy requirement?

Zach Zhu
Intellectual 1960 points
Part Number: BQ25150


Tool/software:

Hi expert,

Hope you are going well.

My customer wants to know if BQ25150 can be used as gauge to achieve SOC 1% accuracy requirement? If the answer is yes, then no fuel gauge is needed in the system. 

Thank you!

BR,

Zach

  • 0
    TI__Mastermind 18510 points

    Hi Zach,

    The BQ25150's ADC can be used for state of charge estimation. Please review the below literature for description of this implementation. I don't know that it can achieve the 1% SOC accuracy as required.

    State of Charge Estimation 

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    TI__Intellectual 1960 points

    Hi Juan,

    Hope you are going well.

    • Could you pls give some advice on how to improve SOC measurement accuracy?
    • Do we have ARM-based configuration files for RD reference? Do we have demo code based on Nordic device?

    BR,

    Zach

  • 0 in reply to Zach Zhu
    TI__Mastermind 18510 points

    Hi Zach,

    Unfortunately there are limitations to the accuracy of the SoC estimation due to the limited hardware on the BQ25150 ADC. The lack of coulomb counting and current integration hardware means that there is only so much approximation that can be done for the SoC. More precise measurements require a discrete gauge with dedicated hardware.

    With regards to software files, we do have driver files for the BQ2515x which can serve as a starting point for other code development. Aside from Linux drivers, we don't have any code specific to this device. If the customer is running a Linux Kernel on their processor they may be able to integrate this directly into their system.

    https://www.ti.com/tool/BQ2515XSW-LINUX 

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    TI__Intellectual 1960 points

    Hi Juan,

    Hope you are going well. I have other questions needed for your help.

    • Will voltage of VDD drop if it outputs 8~9mA
    • If there is no input, BQ25150 can't now exit ship mode, right?

    BR,

    Zach

  • 0 in reply to Zach Zhu
    TI__Mastermind 18510 points

    Hi Zach,

    Zach Zhu said:
    Will voltage of VDD drop if it outputs 8~9mA

    VDD should be able to handle current loads of <10mA DC current.

    Zach Zhu said:
    If there is no input, BQ25150 can't now exit ship mode, right?

    By input I believe you mean at the IN pin. The BQ25150 can exit ship mode via /MR press if battery is sufficiently charged. 

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    TI__Intellectual 1960 points

    Hi Juan,

    Thanks for your prompt reply！

    Ship Mode latches off the device and BAT FET until VIN > VUVLO or the MR button is depressed for tWAKE2 and released.

    Based on description above, there are two ways to exit ship mode. Ship mode can be exited even without Input for IN put. Can ship mode be exited using I2C?

    BR,

    Zach

  • 0 in reply to Zach Zhu
    TI__Mastermind 18510 points

    Hi Zach,

    The listed ways are the only two for exiting shipmode (via VIN or via /MR Press). There isn't a way to exit via I2C, I2C is disabled when the device is in shipmode.

    Best Regards,

    Juan Ospina