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TMS320F28032: PWM output high in an empty device

Brian Wang0
Expert 5120 points
Part Number: TMS320F28032

Hi team,

I am supporting my customer on their F28032 project. On their PP board, the solder the chip first and then program. When they try to program the chip, they found about 1/3 of the board's MOSFET would be destoried. Looking into this problem, they find after power up, GPIO7&8 would simultaneously output high, causing half-bridge to conduct.

Tests:

1. Doubting it is a stock management issue(the device is programed before), they viewed flash with debugger and find then space from 0x3f5f6e to 0x3f7157 is not empty.

2. Both GPIO is pulled down to GND with a 472 resistor. But we could still observe a high level output on this pin.

Question:

1. Does it make sesse for a new chip to have data in 0x3f5f6e to 0x3f7157? Customer also looked at 1-2 normal device, it appears all F.

2. Any idea why these 2 GPIO would output high after reset?

Regards,

Brian

  • 0
    TI__Mastermind 41385 points

    Brian,

    does this issue only happen on one device? Do they see the issue on devices where the FLASH is erased?

    When does it happen, is it immediately after a POR, or does it happen after the device begins to execute the customer's code?

    1. The addresses you mentioned are in FLASH. When a unit is purchased new it should come with its flash erased(all "F"s).
    2. Is the device booting from flash? Possibly it branched to the code which is loaded into the FLASH memory.

    Regards,
    Cody