• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 477 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76PL455EVM-GUI-SW: Unable to open COM port

Robert Westerlund
Prodigy 10 points
Part Number: BQ76PL455EVM-GUI-SW
Other Parts Discussed in Thread: BQ76PL455A-Q1, BQ76PL455EVM, BQ79616

I have a brand new BQ76PL455EVM board that I cannot connect to my computer. I am using the BQ76PL455A-Q1_GUI software, but I receive an error message: "Unable to open COM port." I have tried the following:

Changing the COM port in Windows and reinstalling the drivers.

Testing with different terminal programs, but I get no response.

The D22 LED is on, SW2 is set to single mode, and I have measured the following voltages at the test points:

VIO = 4.98V

VDIG = 5.29V

VREF = 2.49V

V5VAO = 5.27V

VP1 = 5.3V

CHP = 2.62V

VM = -5.17V

WAKEUP = 0V

When testing the board, I have utilized a 24V power supply connected between BAT16 and BAT0. Is there anything I might have overlooked or anything else that can be tested before I need to consider purchasing a new board?

  • 0
    TI__Expert 7000 points

    Hi Robert,

    in-depth support is very limited for PL455 as it is a much older part. I would recommend switching to BQ79616 as it has better current consumption, ADC accuracy, and cell balancing improvements. With that said, for the PL455 EVM, was FT_PROG used to program the FTDI cable? Because VM = -5V, the IC did wake up from a wake ping, so this is either a cord problem or a computer problem.

    Regards,

    David

  • 0 in reply to David Ray
    Prodigy 10 points

    I am aware that the PL455 is an older chip, but I need to connect to an old system that uses PL455 slaves. I have investigated FT_prog but found no information in the PL455 EVM guide indicating that any settings need to be changed. I have also reviewed the FT_prog manual and cannot see what would need to be changed there either

    .

  • 0 in reply to Robert Westerlund
    TI__Expert 7000 points

    Hi Robert,

    To confirm that communication is occurring, I recommend monitoring RX and TX of the EVM with an oscilloscope or logic analyzer.

    If communication is occurring, then it should be determined if the IC is responding to the communication.

    If communication is not occurring, then this would be an issue between the FTDI cable and your computer.

    If this is an issue between the FTDI cable and your computer, I recommend reinstalling the GUI. 

    If reinstalling the GUI does not work, then it would need to be determined why the GUI is unable to send commands to the FTDI cable.

    If the IC is not responding to commands, then we need to look at what commands are specifically being sent.

    Regards,

    David