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TMS320F28069M: Did I kill my Launchpad?

user6227936
Prodigy 30 points

Part Number: TMS320F28069M

Hello!

I tried to Let LED D9 turn on when GPIO19 is set to HIGH. My Launchpad was powered by the USB-Port while trying it. It Worked for about half a second and then turned of

Now when I connect the USB-Cable to power the Board it just starts to whine a little bit and then the LEDs on the Board get very dim and finally seem to turn off.

This does not happen when JP2 is removed. Did I Short something out by accident and killed the Board?

I did use the 5V Pin on the Board as my High-Signal and connected it to GPIO19. 

Thanks and a happy new year to all!

  • 0
    TI__Guru* 95315 points

    By feeding 5v to GPIO19 pin, you violated the VIH(max) requirement stated in the datasheet. It is conceivable that the I/O buffer of the pin (and possibly something else on the chip) is damaged. Is the MCU (or U1) hot to touch? 

    Clarify what you mean by "whine a bit". 

    This does not happen when JP2 is removed.

    I didn’t understand the above. Are you saying everything works fine when JP2 is removed?

  • 0 in reply to Hareesh Janakiraman
    Prodigy 30 points

    Thank you for your replay!

    Complex boards as the TI-Launchpads are new to me. I've only worked with an Arduino Uno. 

    Hareesh J said:
    Are you saying everything works fine when JP2 is removed?

    Sorry, I didn't make myself clear here. The Board is listed in Windows Device Manager, but ich can't program it with new code. I assume by removing JP2 the power to the MCU is disconnected and only the XDS100 Serial Port is communicating with my windows machine. When I reconnect JP2 the board start to behave strangely. The "whining" sounds a little bit like "coil whining" you can get from cheap power supplies.

    Hareesh J said:
    Is the MCU (or U1) hot to touch?

    Yes the MCU is getting warm to the touch. I suppose it is damaged in some way, right?

    Hareesh J said:
    By feeding 5v to GPIO19 pin, you violated the VIH(max) requirement stated in the datasheet

    I've looked in this datasheet and could not find a max value für VIN, so I assumed that 5 V is no problem. That was clearly an error on my side!

    I've searched for the MCU datasheet (here) and it states an input voltage of 3.3 V (max 4.6 V). So it should be okay to use the 3.3 V pin on the launchpad as my high signal, right?

  • 0 in reply to user6227936
    TI__Guru* 95315 points

    So, with a board that was working fine, you are now unable to establish a connection with CCS, correct? The "whining sound" and the fact that you fed 5v to an I/O pin and the IC is warm to the touch indicates that the IC and/or other components on the board is damaged.

    VIH(max) is VDDIO + 0.3v, not 4.6v

  • 0 in reply to Hareesh Janakiraman
    Prodigy 30 points

    Hareesh J said:
    So, with a board that was working fine, you are now unable to establish a connection with CCS, correct?

    Yes

    Hareesh J said:
    The "whining sound" and the fact that you fed 5v to an I/O pin and the IC is warm to the touch indicates that the IC and/or other components on the board is damaged.

    I thought so.

    Tank you for your Help!