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BQ76942: Power management forum

Lon Schneider
Prodigy 200 points
Part Number: BQ76942
Other Parts Discussed in Thread: BQSTUDIO, , EV2400,

We have an 8S1P application which does not require a fuel gauge. The pack will only provide Pack + and Pack – to the host. I chose the bq7694202 to autonomously provide protection functions without the need for a uC or gauge to run it. But I’ll need to program the AFE and test the pack.  I understand that an Interface Adapter (other than the EV2400)  is needed in order to use bqStudio with the bq76942.  Is that correct? 

 

If so, is there an existing Interface Adapter board available from TI?  To be awarded the project we are to build 10 packs for evaluation, in a short time.  Creating an Interface Adaptor board at this phase involves time and risk, so I’m investigating options.

 I noted versions of FW on the website. On the EVM, Is the uC programmed with the FW for I2C or SPI?

Thank you,

Lon

  • 0
    TI__Mastermind 25556 points

    Hello Lon,

    To interface with the BQStudio GUI, you need the EV2400. We do have an Evaluation board available to purchase at ti.com which you could use to communicate with BQStudio, it has the EV2400 integrated on the board. 

    I am not sure what FW on the website you are referring to. Please see the table below for device comparison. 


    The BQ7694202 is I2C based and has CRC enabled. It also has the REG1 LDO set to 3.3V by default which typically customers use REG1 to power the MCU.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 200 points

    Hello Jose,

    I have a bq76942EVM. It includes a USB to USB -C interface cable. It sounds like with an EV2400, connecting it to J3 with the regular 4 lead  EV2400 cable allows communicating and programming the bq76942 without the need for a the on-board uC. Is that correct?  Please confirm. That would be a great relief if that is the case. 

    The FW I found was in a folder named sloc701, containing versions for SPI or I2C on MPS430 or STM32 uC's.  From your response, it appears that I don't need a uC to program or communicate with the AFW, so have no need for either FW.

    Thank you,

    Lon.  

  • 0 in reply to Lon Schneider
    Prodigy 200 points

    Correction:: That should have been J13.  and AFE,  

  • 0 in reply to Lon Schneider
    TI__Mastermind 25556 points

    Hello Lon,

    Please see below, this is all you need to power the BQ76942EVM board and talk to BQStudio. Also the BQ76942EVM User's Guide should describe the setup and connections. 

    Lon Schneider said:
    It sounds like with an EV2400, connecting it to J3 with the regular 4 lead  EV2400 cable allows communicating and programming the bq76942 without the need for a the on-board uC. Is that correct? 

    Using the external EV2400 is another option. But, I would not use it since it is a bit redundant because we already have the EV2400 integrated. But, if you would like to use the external EV2400, simply disconnect the J15 and J12 headers and use the J13 to connect in the I2C connector from the EV2400.

    As for the "SLUC701A.ZIP", this is not a FW. This is a starting software example code for users to start implementing their code for production. The code is provided in SPI and I2C. We recommend I2C because you can send multiple I2C bytes (blocks), and this is convenient when reading the voltage measurements per say. This is explained in the BQ769x2 Software Development Guide.  

    Regards,
    Jose Couso