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RTOS/BQ76PL455A-Q1: bq76PL455A-Q1

elham mirzaei
Prodigy 190 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A

Tool/software: TI-RTOS

Hi David,
I face problem while trying to start with the serial communication of the board.I just used this reference attach and connect the VIO to the 3.3 v of MCU supply.Also connect the same ground to both ,but when I power the board and try to use your GUI ,the Serial Com is recolonized but there is an error which declared ''Unable to open COM PORT''.I checked the resistors and capacitor on my board,the voltage is 3.3 on VIO as it is on my MCU,TX and RX.I also make a birgde betweeen the MCU and PC and run my code but I can not see anything in Tera term.I8037.bq76PL455A-Q1 Bridge Reference Schematic.PDF can not understand the problem .I would be thankful if you can get the point
Kind Regards
Elham

  • 0
    TI__Genius 11480 points
    Hi Elham,

    Can you confirm that the latest version of the FTDI cable is installed?

    Can you use a logic analyzer or scope to see if there is any communication on TX/RX?

    Out of curiosity, where did you find that schematic? This is the version we have released on the web: www.ti.com/.../tidrr08.pdf

    Are you powering the part with ~12V? The part will not work without that power
  • 0 in reply to David Wiest Jr
    Prodigy 190 points

    Hi Dave,

    Actually I do not use the FTDI cable.Instead I am connecting it to my micro controller and pull up the VIO to the power of 3.3 of MCU with the same ground.I provide a bridge with PC in between and just send some data from MCU to the IC. and read the data in a terminal emulator program.at the same time I tried to open the GUI but it couldn't open. So I used the scope and check the signal over RX of bqpl455,and I found the digital signal there.So I'm sure RX of IC is reading data from MCU,I also powered  it with 12 v.The next step is to initialize all the registers and try to transmit data from Ic but but I don't know if the IC is already in sleep mode and for the start I need to use wake up pin to move it to the IDLE state?

    I found it here in FORUMS,So I need to change my hardware  according to the new one?

    Moreover I was wondering the baud rate of 250000 which is recommended in the datasheet is not none those standard ones.Is it any problem to choose the nearest standard one to 250 k?

    Kind Regards

    Elham