TM4C1294NCPDT: some cases we got failure of TM4C194NCPDT in our cards

Hi,

  Can you please provide more details about the GPIO not working?

  Which GPIO pins are not working? There are two GPIO errata. Can you check if any one of them is matching your issue?

  How many cards are not working?

  What is the percentage of failure?

  Do you have any known good MCU that you can swap in to your cards? Will the known good MCU continue to work. Basically, it is do a perform a ABA swap test. Swap a good   MCU to your card and also swap the failure MCU to a known good card. Will the failure MCU continue to fail in a known good card? This information will provide more clues as to   what happen. 

 Also a heads up, I will be out of office until Aug-10th. My response will be delayed. 

Hi,

below listed GPIO not working in one card but program can download through JTAG.

PB0 - USBID , PB1 - +VBUS

PD4 - U0RX, PD5 - U0TX, PD6 - USB0EPEN, PD7 - USB0PFLT

PN0 to PN5 - define as input for Switch

PQ4 - define as Output

SPI working,

In another card below GPIO not working and also program can not download and micro-controller getting heated.

PB0 - USBID , PB1 - +VBUS

PD6 - USB0EPEN, PD7 - USB0PFLT

PN0 to PN5 - define as input for Switch

PQ4 - define as Output

SPI working,

How many cards are not working?

10 to 15 card found faulty in year 2022-2023 and micro-controller not working but we haven't any micro-controller in stock and not available in market, we so can't replace it.

What is the percentage of failure?

more than 20%

below is schematic

Charles Tsai said:

failure

Regards,

Dharmendra

Dharmendra Panchal said:

What is the percentage of failure?

more than 20%

Hi,

  This means you have about 80% of the cards that are working, correct?

  - Can you do a ABA swap for the MCU from the good working cards to the failure cards? Also swap the failing MCU to the good working card. What is the result? We need to isolate the problem if the problem is truly a MCU problem or a board problem?

  - Can you take a picture of the device marking on the MCUs that have GPIO problem? 

Hi,

Yes, 70%to 80% card working. we already done same earlier before two year when new micro-controller mount in faulty card and it is working.

Now not possible replace new micro-controller, because we don't have any stock or not available in market also.

- Can you take a picture of the device marking on the MCUs that have GPIO problem? 

Yes, find below

Regards,

Dharmendra

Hi Dharmendra,

  Can you please tell me where did you obtain this device from? Is it directly from TI or a valid distributor?

Hi,

we assembled our card from our EMS (INCAP) located in bangalore, and they purchased texas device directly from any authorized supplier of texas like arrow, digikey etc. 

Please help to solve the problem, we don't have any card to support our customer because our card not manufacture by EMS due to micro-controller shortage in market from last 1.5 year.

Regards,

Dharmendra

Hi,

 I will take the device marking for internal investigation. Please clarify if the device marking reads 9BAGRGW or 9BAGRCW. Your picture is not very clear on some of the letters. Please print out the 3rd row again. 

  Can you tell me if this is a field return or the GPIO issue is found during line production? If this is a field return, then how long has these cards been on the field? These information will help investigation. 

Hi,

3rd device marking is 9BAGRCW.

all faulty cards return from field.

Hi,

  We are investigating your reported device marking. Can you tell exactly how many are faulty?

Hi,

  While I'm waiting for internal investigation by our engineering team, can you provide some more information?

  - Can you tell exactly how many cards are faulty?

  - For these faulty field returns, how long have they been on the fields, eg. days, weeks, months or years?

  - Are these field returns from the same field/customer or from different fields/customers randomly?

  - Did you have a recent change to the board or schematic design? You mentioned you have had used TM4C129 for 8 years without a problem. I just wanted to understand if there is any change to the PCB or schematic.

  - What exactly is not working when you said some of the GPIO pins are faulty? You seem to use USB, UART and GPIO. Please elaborate what is wrong with USB, UART or GPIO when they do not work. 

 - Please  be aware of the below two errata. Is your failure matching the errata description?

Hi,

  Do you have a chance to provide feedback to my questions?