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Trouble-shooting the THS7303EVM

Karen
Intellectual 940 points
Other Parts Discussed in Thread: THS7303

I have your THS7303EVM and I am having a problem getting data from the I2C lines.  Do you have any suggestions for trouble-shooting?

  • 0
    TI__Intellectual 940 points

    The communication between the computer and the EVM over USB is not truly "plug and play” so the system must be powered up in sequence for proper communication. Here is what needs to occur:

     

    a) Make sure the computer program (THS73x3 EVM Control program) is closed.

    b) Make sure there is NO power applied to the EVM (both 3.3V and the VA (THS7303) power).

    c) Ensure the USB cable is plugged into both the computer and the EVM.

    d) Apply both 3.3V and the VA power to the THS73x3 EVM.

    e) The USB ACTIVE LED (D2) must be lit Yellow. For the Yellow LED to light on power-up, the 5V power supply must be turned on after the 3.3V supply. If it is not lit, then there is an EEPROM communication problem between U2 and U3. This must be corrected before going any further.

    f) Configure the I2C address jumpers (JP1 and JP2) for the desired I2C addressing. With the jumpers removed, the 2 LSB will be 00.

    g) With D2 lit, now start the computer program (THS73x3 EVM Control).

    h) Configure the program as desired making sure the address of the THS73x3 matches with the Jumper settings JP1 and JP2. By default, 00 will match the EVM with the jumpers removed.

    i) Once configured, pressing the Execute button writes the code to the EVM which sends the proper I2C codes to the THS73x3. The computer program should show the "green" light which means it has confirmed proper communication to the THS73x3.

     

    Note that if the EVM power is removed for any reason, the computer program MUST be closed before proper communication can occur again and you must go back to the first step above.