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Query related TMS320F2811 DSP controller

Amtech
Genius 4585 points
Other Parts Discussed in Thread: TMS320F2811

Dear Sir,

We are using TMS320F2811 DSP controller. We are in field of power electronics product like AC Drive and others. We are using this controller since last 15 years in our different different products.

Three years ago we developed control board using this DSP for power supply product and dispatched to customer. From that date to today these products are packed at customer end. During these time humidity of environment is higher. (near about 90% RH). Before one month ago, installation and commissioning completed and power up the products but out of that 35 nos of DSP based control boards( out of 115 nos ) are not start. After analysis we found that DSP of that boards are damage. And we replace with new DSP, boards are working OK. None of the other components are changed. All the control boards are coated with weather protected process. So what could be reason behind this?? any one have idea about this?

Waiting for your prompt reply.

Thank you.

  • 0
    Guru 192875 points
    Hi,

    ESD can play a spoil sport here. Any chances of miss-handling the boards while packing/assembling? Do you place any stickers on the chip for firmware version etc...?

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Genius 4585 points
    Hi,
    Thank you for your reply.
    Control board is fix in module (enclosed) before testing and than after dispatched. so there is no any chance related ESD and miss-handling. there is no any sticker on the chip for firmware version.
    Is there any other condition for damage DSP?
  • 0 in reply to Amtech
    Guru 192875 points
    There doesn't seem to be any other way to damage the mcu. Yes, the only reason can be the distributor. Is he an authorized distributor for Texas Instruments?
  • 0
    TI__Expert 5690 points
    Dear Sir,

    As long as the devices were not heated for soldering after the exposure to high humidity there should not be a problem with the devices, particularly if they were conformal coated as you indicate.

    There is the possibility of other problems with the board or poor solder joints in the original assembly that would also have been fixed by replacing the F2811. You might check if simply removing the conformal coating causes the boards to work. Another option is to remount one of the suspected failing F2811 devices into a known working board. If the working board begins to fail (the fail follows the F2811), then you could return the device through your distributor for analysis.

    Another idea is to ensure the Flash contents are as expected. The Flash contents will not degrade under normal storage conditions (typically <55C), however with old hardware I would worry about possible field programming of the flash (intentional) or some other mix up over the years with software compatibility to host software. This really depends on if the flash can be upgraded in the field and who would have had access, I'm just throwing out ideas.

    Best regards,
    Jason