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BQ76PL455A-Q1: "Unable to connect port". Device manager and 12V battery connected as well as TMS570 example code ran before hand (as is)

Elda Potter
Intellectual 440 points
Part Number: BQ76PL455A-Q1

Dear Sir/Madam:

Please share strategy to use GUI I have read the BQ GUI documents and still have not fully understood.

Details: Modifications were made for TMS570 as listed in TIDM-TMS570BMS guide which were remove R8 and R9, connect pin 38 to nhet002 and pin 39 to nhet00.

However the GUI does not run, there is an error message "Unable to connect to port".

The BQ board is connected to a 12V at TOP and BQ Board J3 is connected to TMS57004 J1 and J2 as listed in TIDM-TMS570BMS guide. However I did not connect the BQ board J6 connector to TMS57004 because if J6 is a thermistor there is no cause to connect. Also, the 16 cell batteries were not connected yet.

What steps must I take to get the BQ GUI working? Given the setup description above and the quick start guide in TIDM-TMS570BMS what am I missing to get this to work?

Please if there is any further information you require to better answer this question.

  • 0
    TI__Genius 11480 points
    Hi Elda,

    I believe that there is a mistake in the documentation for J6. The modifications you have made seem correct. Next, you must connect the TMS570 to the white UART header, as you would with a normal PL455 EVM (connections are documented in the example code). You must also have the cells powering the PL455, otherwise there will be no response and the GUI will not open.
  • 0 in reply to David Wiest Jr
    Intellectual 440 points

    Hi Mr. Weist, 

    When I connected the  TMS570 to the white UART header and connected the cells to power the PL455 I recieved this error. 
    Also if it is suspected that one of the R pins (that is, pin 38 and pin 39) is damaged how may that be verified? 

    Elda

  • 0 in reply to Elda Potter
    TI__Genius 11480 points
    Hi Elda,

    I think if one of those pins are damaged, then you certainly could see an incorrect CRC.

    You may be able to use an ohm-meter or continuity function to detect a gross short. If you have access to a thermal camera, you may be able to see increased current consumption in the form of higher temperature than a good unit.

    Of course, if you have a separate launchpad the easiest way to diagnose it is a swap test with a new launchpad.