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BQ27742EVM: BQ27742-G1

kavya medandi
Prodigy 170 points
Part Number: BQ27742EVM
Other Parts Discussed in Thread: BQSTUDIO, EV2400, , MSP430F413, USB2ANY

Hi,

I recently purchased BQ27742EVM board for connecting to MSP430F13 controller. I directly connected HDQ from EVM to pin on MSP430. I'm trying to communicate through commands. But I'm seeing only Reset pulse, Presence, invalid command:0x00, data:0x00 on logic analyzer. In EVM doc it is mentioned that fuel gauge default state is I2C. We have to bring into HDQ using bqstudio and interface in between with EV2400. I don't have EV2400 and bqstudio with me. I want to communicate with fuel gauge board using controller for HDQ protocol. How to make EVM board work into HDQ mode without bqstudio software.

Thanks in advance.

Kavya.

sluuax8.pdf

  • 0
    TI__Genius 11770 points

    Hello Kavya,

    The command to send the gauge into HDQ mode must be done via I2C. For most people, they flash new gauges in the factory with their configuration via I2C, then send the command to switch to HDQ mode once it is done programming. Does your MSP430 have I2C pins you could use to send the device into I2C mode? BQstudio/EV2400 are not required to make this switch; they only make it easier. Let me know if you have any questions about doing this manually.

    thanks,

    Alex M.

  • 0 in reply to Alexander Mazany
    Prodigy 170 points

    Hi Alex,

    I'm currently using MSP430F413 controller. It is not having I2C pins. Can you suggest me any alternate procedure to work with same controller and fuel gauge.

    Thank you,

    Kavya M.

  • 0 in reply to kavya medandi
    TI__Genius 11770 points

    Hello Kavya,

    I searched a bit and found this on the MSP E2E forum. I believe it is a guide on how to implement a software I2C. Maybe this could work for you? Otherwise, you could try asking the MSP group directly.

    On our end, it will need to happen through I2C, how that gets done is up to you. There are some other possibilities like USB2ANY or using some other standalone board with I2C functionality. Of course, if you were going to buy an adaptor of some kind it may as well be the EV2400. I think the SW I2C idea has the most potential, but since I am not very familiar with those devices I can't help much with it.

    thanks,

    Alex M.