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TM4C123GH6PM: TM4C123GH6PM

Chan Chun Tatt
Prodigy 10 points
Part Number: TM4C123GH6PM

We did receive our customer complain as the final unit are not able to control the motor turn up & down due to IC --> TM4C123GH6PM CANL & CANL are not respond. 

Here to clarify as during our functional test are passed (CANH & CANL are function), but customer end customer used it are failed. 

Our team done the A-B-A swab and can see the failure is from TM4C123GH6PM. 

We would like TI team help to analysis in component level such as which wire bonding are broken or burn mark cause the IC are mul-function. 

We would like to request TI team help to analysis in IC level therefore we can close with my customer. 

Appreciate your team help. 

  • 0
    TI__Guru**** 190806 points

    Hi,

      Please elaborate the problem on what is wrong with the CAN operation? Please bear in mind that MCU does NOT produce CANL and CANL. The CANL and CANH are differential signals generated by the transceiver. The MCU only generates digital CANRX and CANTX signals. Please capture the CANRX and CANTX signals on scope or logic analyzer. 

      In addition, what exactly is your ABA swap test?

      - Did you replace the suspected MCU with a known good MCU and verify that the good MCU continues to work on the suspected board

      - Did you place the suspected MCU on a known good PCB board and verify that the known good board does not work anymore with the suspected MCU. 

      - Are you able to confirm it is not a problem with the CAN transceiver? Have you done the same ABA swap test for the CAN transceiver IC that confirms the problem is not related to the CAN transceiver?

      - Have you verified that you have good soldering on your PCB board?

      - Is the MCU on the same board as the transceiver? If they are not on the same board and are connected through a connector then do you have proper diode protection to avoid transient and overvoltage?

  • 0 in reply to Charles Tsai
    Prodigy 10 points

    Hi Charles, 

    Thanks for your replied. 

    Here I answer the question as below: 

    - In addition, what exactly is your ABA swap test?

    Ans: I'm using a production test pass PCBA and swap with customer return board parts TM4C123GH6PM. 

    I can found that the failure is following by IC TM4C123GH6PM. Pass PCBA will become pass and Pass PCBA will become fail with same fail symptom which received from customer. 

      - Did you replace the suspected MCU with a known good MCU and verify that the good MCU continues to work on the suspected board

    Ans: Yes. Following the A-B-A swap mention above, I can confirm the failure is following by the IC TM4C123GH6PM. 

      - Did you place the suspected MCU on a known good PCB board and verify that the known good board does not work anymore with the suspected MCU. 

    Ans: Yes. Following the A-B-A swap mention above. 

      - Are you able to confirm it is not a problem with the CAN transceiver? Have you done the same ABA swap test for the CAN transceiver IC that confirms the problem is not related to the CAN transceiver?

    Ans: Yes. Following the A-B-A swap mention above.

    PCBA return from customer field and it pass our production functional test. We did check with the MCU supply the power into the IC and all the voltage are good. Only when send command to CAN Rx, we cannot get the outcome from CAN Tx. 

      - Have you verified that you have good soldering on your PCB board?

    Ans: This board is customer field return. We did perform the functional test in our production and its pass PCBA then we ship to customer. 

    While received from customer, I checked with 20x visual inspect from the solder and its fulfill with IPC610 standard.  

      - Is the MCU on the same board as the transceiver? If they are not on the same board and are connected through a connector then do you have proper diode protection to avoid transient and overvoltage?

    Ans: Transceiver & Receiver are connect by other PCBA. Transceiver & Receiver are parts of our functional tester. So during retest I'm using the same Transceiver & Receiver. From my A-B-A test, I can confirm failure is follow by IC TM4C123GH6PM. 

  • 0 in reply to Chan Chun Tatt
    TI__Guru**** 190806 points

    Hi,

      Thanks for providing the details. Your ABA swap test does lead to the MCU IC. 

      Where did you purchase the product? Depending where the the product is purchased, can you please follow the customer return procedure outlined in this link https://www.ti.com/support-quality/additional-information/customer-returns.html as we don't directly handle the product return on the e2e forum. 

    https://www.ti.com/productreturns/docs/createReturn.tsp