TDA4VM: How to enable TDA4 watchdog function

Hello,

Vinter said:

1. How to enable the watchdog function of TDA4 so that it can monitor A72, MCU1-0, MCU1-1, MCU2-0, MCU2-1, MCU2-3, MCU3-1, etc

The watchdog is available to trigger such interrupts in the safety case to monitor the health of the different cores. You can find example code for monitoring the R5F cores in our MCAL project: https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/mcusw/mcal_drv/docs/drv_docs/ug_wdg_top.html

You can also find a different implementation in our SDL project which handles all the different cores: https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/08_05_00_11/exports/docs/sdl/sdl_docs/userguide/j721e/modules/rti.html

Vinter said:

2. What are the functions of the two pins SOC_SAFETY_ERRZ and MCU_SAFETY_ERRZ? If the TDA4 watchdog function is enabled, will these two pins trigger and restart the system when something goes wrong?

These pins are available on the SoC, you can check our Schematic for an example. In our EVM, you can see that the pins are routed to the PMIC.

Vinter said:

3. Does TDA4 or PMIC have hardware watchdog function?

Do you mean a hardware watchdog that is automatically turned on? There is one that is used in the ROM boot sequence (From TDA4VM TRM):

I don't know about the PMIC having a watchdog that can be used.

Regards,

Erick