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BQ76952EVM: not connecting to the evm software

Anjan Prasad
Prodigy 150 points
Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQ76952, BQSTUDIO, BQ7718

When starting the EVM for the first time, I gave 48V between B- and VC16.  The cell simulator and I2c shunts are present. The red led at the fuse is blinking. the software is not detecting the EVM. What could have possibly gone wrong. I followed the procedure in the guide.

Please suggest

  • 0
    TI__Guru 54715 points

    Hi Anjan,

    If the red LED at the fuse is blinking it sounds like the voltage is unstable to the OV protectors, possibly on some of the inputs.  Be sure there is nothing conductive under the EVM board which could be making intermittent contact.  Be sure the cell simulator shunts are in place, see Figure 2-1 of the EVM user guide.

    The BQ76952 should still talk even with OV.  Check for intermittent connection to the board such as a loose wire in the terminal block or if the screw is tightened on the wire insulation.  I would not expect poor connection to cause intermittent OV indication however.

    You might proceed with the device selection manually in BQStudio to check to see if the adapter is detected, see figure 3-2.

    You might check the voltage to the BAT test point, see the board drawing, and after power application check that the part is on by observing about 1.8V at TP10 REG18 above the WAKE switch.  If BAT voltage is present and REG18 is not, try the WAKE switch.  

    If voltage is present and the interface is shown in BQStudio, but the part won't talk, check the shunt connection or for loose shunts on the board.  Be sure the surface mount headers have not been broken loose from the board from damage. 

  • 0 in reply to WM5295
    Prodigy 150 points

    Hai

    Thank you for the response.

    As you said, I double checked the shunts on the EVM, they appeared fine to me. The voltage at REG18 is read as 1.2V.

    The issue is the EVM is not talking to the BQStudio. It is not detected in the studio and if I manually select the device and proceed the software is shutting down.

    What must have went wrong?

  • 0 in reply to Anjan Prasad
    TI__Guru 54715 points

    Hi Anjan,

    The board would seem damaged. You might check power and the voltage distribution across the cell simulator resistors at the input terminal blocks. the red fuse light could be from one of the BQ7718 sensing a high cell voltage which is not expected from your voltage description and the appearance that all cell simulator shunts are installed. You might check with the schematic in the EVM user guide to see what is activating the FUSE LED.

    The 1.2V on REG18 is abnormal.  The BQ76952 can also activate the fuse, it is not know if it could do so with such a low voltage.

    If there is no mechanical damage some sort of overvoltage is a likely cause of electronic damage.