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BQ76942EVM: "no free adapter are available on this device" Windows 11 Pro

Jason Aiello
Prodigy 20 points
Part Number: BQ76942EVM
Other Parts Discussed in Thread: BQSTUDIO, , BQ76942, EV2400

Tool/software:

Hello,

I purchased 2 development kits (bq76942evm) and can't get either to connect. I am running the latest bqstudio on a windows 11 pro machine and am getting the following error message. "no free adapters are available on this device"

I can see the device enumerate in device manager.

The Jumpers are J12 and J15 are steered to uc_SCL and uc_SDA.

D14, D15, and D16 are all lit and I am powering the device with 36V accross cell10 and Bat-. 

I measure 5V at Vbus and 3.3V at TP44. 

Can you please advise?

Thank you 
Jason

  • 0
    Prodigy 20 points

    Can someone please provide some guidance on this issue? :-)

  • 0 in reply to Jason Aiello
    TI__Expert 5645 points

    Hi Jason, 

    Apologies for the delay on getting back to you. Support queue is very high right now and responses are taking longer than usual. 

    Can you confirm that you are using a working BQ2400 as an adapter? Below snipped shows the BQ2300

    You can refer to the Section 2 BQ76942 EVM Quick Start Guide of the EVM User Guide as a guide (https://www.ti.com/lit/ug/sluuc32a/sluuc32a.pdf). 

  • 0 in reply to Arelis Guerrero
    Prodigy 20 points

    The BQ76942EVM has the EV2400 circuit on board as far as I understand it..

    Also, I did purchase a separate EV2400 to support interfacing to my design once it comes to fruition. When I plug the EV2400 in and try using bqstudio it also does not see the adapter and it and reports the same error.

  • 0 in reply to Jason Aiello
    TI__Expert 5645 points

    Hi Jason, 

    Correct, the BQ76942EVM does include the EV2400 pre-programmed on board, but some customers like to use the external one or a different controller. Please double check you are following all the steps on the User Guide mentioned above, and that the HW is configured correctly accordingly to the guide. 

    The "no free adapter error" happen when the EV2400 is not being detected by the machine. You mentioned you tried multiple EVMs, which makes me thing there might be something else going on. As you have a different EV2400, can you please try to update the firmware to the latest version https://www.ti.com/tool/EV2400 . You can try versions 0.28 or 0.32. 

    Also, just to remove any issues with your operating system and PC, can you try the EV2400 on a Windows X as well with the latest firmware. 

    In addition, are you able to see any communication out of the EV2400 when you open the GUI?  I want to make sure the I2C signals are being output correctly, so if you can capture that with a logic analyzer or a scope it'll be very helpful.  

    Regards, 

    Arelis G. Guerrero