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TMS320F28379D: LAUNCHXL-F28379D schematics do not match with the launchpad

Gobind Singh
Intellectual 720 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hi,

We have a launchpad with TMS320F28379D controller. I have configured the PLL and wanted to check the clock frequency on XCLKOUT/GPIO73. As per the schematics in SPRUI77C, page 16, GPIO73 is available on J9 connector at pin 37. But when I configured the GPIO as XCLKOUT and probed on the Oscilloscope, I did not see any waveform. It was just a continuous low. 

After that, I randomly changed the pull up disable (GPCPUD) registers for different pins and found that pin 37 of J9 connector is actually to connected to GPIO70 instead of GPIO73. 

Then I thought I might have gone wrong with the pin counts. Since as per the schematics, pin 1 is ground, I thought of finding out pin 1 on the board using DMM. But I found that none of the corner pins are ground. This makes me believe that the schematics of this launchpad is a whole mess. Could you please help me out on this?

Thank you.

Gobind Singh

  • 0
    TI__Mastermind 45606 points

    Hi Gobind Singh,

    The schematic is correct, but there is an error in the board's silkscreen. The pin 1 indicator should be on the other side of the connector. You can review the gerber/design files for this board within C2000ware to better understand what I mean:

    C:\ti\c2000\C2000Ware_2_00_00_02\boards\LaunchPads\LAUNCHXL_F28379D\R2.0

    Gobind Singh said:
    Then I thought I might have gone wrong with the pin counts. Since as per the schematics, pin 1 is ground, I thought of finding out pin 1 on the board using DMM. But I found that none of the corner pins are ground. This makes me believe that the schematics of this launchpad is a whole mess. Could you please help me out on this?

    Each contact at the 4 corners of the connector are metal holds only. This is described in the connector's datasheet/drawings (PN: 'DF40C-60DP-0.4V(51)') .

    I'll ensure this gets reported internally and either gets documented or fixed in the future.

    Thank,

    Kevin