We have a product containing the STM32G030K8T6 MCU. The code is working like expected and the product is meeting all specifications. The product is battery powered and can be charged via USB.
If the product is assembled it will go into a burn-in test where 70 plus products will be charged and de-charged between 3 to 10 times. During this test 1 to 3 products are failing, and with failing I mean the MCU does not advance further or freeze as shown in the below picture.
It stops at the following line of code:
- Below is the configuration of the HW.
- MCU: STM32G030K8Tx
- USB to UART Chip: CH340E
- UART Port: USART1
- Below are our observations.
- After removing power to the MCU and the rest of the circuitry completely and re-applying the power again, the MCU remains frozen at this step.
- We also checked for flash corruption. When we read the Flash (Device memory) and save the file and compare the saved file with the original binary, there are no differences. So, this proves that there is no corruption in flash.
- We cannot reproduce this issue at our place, but the customer reproduces after 5 or more iterations of battery charge and discharge cycles.
- Also, this issue is not reproducible on every device. Approximately 10 percent of the devices.
- When we reflash the MCU, then the problem strangely goes away.
Currently we are at a dead end situation, does anybody has any suggestions?
Thanks a ton!
