STM32F373VC Controller Hang Issue during RS test (EMI/EMC)

[Kavya]

Hi Team,

We are utilizing the STM32F373VC controller in our product. However, we have observed that the controller hangs after performing an RS test and only recovers after a power cycle. The device functions normally under other conditions. Below are the relevant details:

1. An external crystal of 32 MHz is used as the clock source.
2. The peripherals in use include ADC, SDADC, USB, I2C (external EEPROM), Timer, UART, RTC, and an independent watchdog.

The following analysis has been conducted:

1. The watchdog is functioning as expected.
2. The device is not hanging in any while statement in the application code.
3. The controller is not in any fault handler.
4. The device is not responding to any external operations.

Could you please assist in understanding and resolving this issue?

Thank you in advance

[Ozone]

What exactly do you mean with "RS test" ?

As I remember correctly, the requirement for a power cycle after the injection is explicitely allowed.

Furthermore, the test is executed for the whole device, with the MCU  being just one part of it. If you want your device to recover from potentially destructive interference, you would need to look at the whole design.

[Kavya]

Radiation susceptibility test is a part of EMI/EMC test. 

Yes, I agree we need to see and take care on design level. Currently I do not have the scope to revise the hardware. 

I want to understand what will happen to the controller at this stage. Why it's in hang state?