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BQ769X0EVM with EV2300: unable to detect a connected device

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Hello,


I tried to connect via I2c to the BQ76920EVM and BQ76940EVM boards through the EV2300 interface, but I always get the "unable to detect a connected device" error from the bq76940 evaluation software.

Since it's mentioned that the EV2400 has got problems when using bqStudio to evaluate the fuel gauge, I ordered the EV2300.

I have tried using Windows 7 64 bit and Windows 7 32 bit. Both with .NET 4 installed.

  • The EV2300 drivers have been installed prior to connecting the EV2300 interface.
  • I have removed the shunts connecting the AFE to the fuel gauge (bq78350).
  • I have left the pull-up SCL&SDA shunts on, since I'm using the EV2300.
  • The switches are closed.
  • The EV2300 usb cable is plugged in the PC.
  • The I2C cable is connected both to the bq769x0EVM and the EV2300.
  • The bq769x0EVM is powered with a 18V source connected to the "BATT" terminals. A red led is lighted.
  • I have pressed and released the bq769x0EVM BOOT switch.
  • Upon starting the bq76940 evaluation software the above error message appears.

I'm confident I didn't miss any steps, and I even installed Windows 7 32 bit to rule out any EV2300 driver issue I might be having on Win 7 64 bit. I don't really know how to debug the issue. Both the bq76920evm and the bq76940evm show the same exact error (the only difference being the applied voltage).

I searched the forums because I presumed not to be the only one having this problem, but apparently I am.

What should I do now to debug the issue? The bq76940 evaluation software prints out nothing in the command line.

Thanks in advance.


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