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BQ25756EVM: Device ACK Error

Dattatreya Roy
Prodigy 70 points
Part Number: BQ25756EVM
Other Parts Discussed in Thread: BQSTUDIO, , EV2400

Tool/software:

Hello,

I am trying to connect the BQ25756EVM to the BQstudio GUI using EV2400 board. When I am trying to read the registers it is giving a "Device ACK error" (attached screenshot). I have followed all the setup steps mentioned in the user guide and have also tried the following -

- Manual and immediate update modes

- Both D6(6B) and D4(6A) I2C addresses

- Updated the EV2400 firmware to latest version v0.28.

I am also not sure about the following -

- Should I connect a voltage source/electronic load to the board as well? I haven't connected a voltage source on J1 as the voltage source should be turned off before connecting EV2400 as per the user manual.

- I did not remove the JP13 jumper before connecting the EV2400 board in the first few attempts but now I have removed it and it is showing the same error. Would the board get damaged if JP13 is not removed?

Can somebody help me solve this error?

Best regards,

Datta

  • 0
    TI__Expert 6145 points

    Hi Datta,

    Thanks for working with this. I2C will not work without power to the EVM. Connect the EV2400, remove JP13 to disable charge, then power on the board. I do not believe that leaving JP13 installed will damage the board.

    One other thing that I have found while using the EV2400 with BQStudio: Connect the EV2400 to the computer via USB prior to opening the BQStudio application. Otherwise, following all other steps properly will always result in a device ack error.

    Let me know if this answer helps solve the problem.

    Best,
    Michael