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TMS570LS3137 Failure (IC High Temperature)

David Rodriguez Rodriguez
Prodigy 230 points
Other Parts Discussed in Thread: TMS570LS3137

Hi everyone, I´m using TMS570LS3137  microcontroller. It´s matricula printed over IC is listed below:

TMS570LS

3137CPGEQQ1

YFC-39AX5RW

G4

After turning on the PCB board, only the microcontroller begins to warm gradually.

A measurement of the impedance of the power supply node "3.3V", the value obtained corresponds to: 40 Ohms (doing the same measurement in a functional board, was obtained an impedance value of: 3.3 KOhms).

Similarly, the value of the impedance of the power node "1.2V", corresponds to 298 Ohms (doing the same measurement in a functional board, was obtained an impedance value of: 6.6KOhms).

Damaged PCB board counsumes 50mA more than a functional board.

We have not been able to identify exactly what might be the cause of the failure, since the values of the supply voltages of the microcontroller have the correct voltage. By now this failure is attributed to an internal short circuit into the microcontroller.

I have understood that this type of failure should be reported to the manufacturer to rule out any bug in this hardware version.

Please could you help me to identify a possible cause?

Who should I contact to follow up this failure?

 

  • 0
    TI__Guru 68950 points

    David,

    Generally it's not enough to just check the supply voltages.   A high current could be due to overdriving an MCU pin (say trying to input 5V to a 3.3V IO).   Or it could be a software / flash programming issue (PLL set much too high causing high current consumption).   Or there could be ESD damage to the MCU.    Additionally there is process variation from device to device.   And it would also be important to check that there isn't a large overshoot past the spec on the power supply during power up, or that there's a significant difference on the 1.2V rail due to component tolerances (say in the resistor divider setting the rail voltage - difference between 1.20V and 1.26 V might account for 50mA).

    But you seem to indicated the board is damaged.  Other than the higher than 'normal' current - what failure symptoms are you seeing?

    -Anthony