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TMS320F28P550SJ: Chip overheating

Julia Li
Expert 4755 points

Part Number: TMS320F28P550SJ

Hi Champs,

 

Now my customer found a MCU failure during the prototype stage, detailed as follows:
1. The prototype suddenly shut down during operation, and the temperature-monitoring F28P550 rapidly increased from 86℃ to 114℃;
2. Test the power consumption of the prototype when standby. The total power input is 8W (normally it is 2.2W), and the input power without DSP supply is 1.6W; 
3. Test the overheating F28P550, its ADC and EPWM function are both normal; 
4. After replacing the F28P550, the prototype's power consumption returned to normal. 

The customer want to know why this heating phenomenon occurs, because the ADC and EPWM modules are working normally, the customer suspects that there might be some internal short circuit in the F28P550. Could you help to check this?

Thanks!

Best regards,

Julia

  • 0
    TI__Mastermind 20951 points

    Hi Julia,

    Usually when the chip is overheating, it means the device was damaged in some way. As a quick check, I would evaluate all of the analog inputs and ensure that they are all capped at 3.3V, as any voltage exceeding 3.3V will damage the device and cause the behavior mentioned, even if it seems the performance of the device is the same.

    Additionally, please ensure that no voltages exceeding 3.3V are going into any of the other pins (except for appropriate 5V tolerant pins). Sometimes customers may connect to an IC that is output 5V digital signal on accident, ensure VCC of other connected devices is appropriate set to 3.3V

    Regards,

    Peter