• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 462 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1146-Q1: TCAN1146 watchdog

Mike van Haare
Prodigy 10 points
Part Number: TCAN1146-Q1

Hi!

I have a question about the watchdog functionality of TCAN1146-Q1.

For me it's not clear how I can reset the uController when a watchdog violation has occurred. Normally I would expect a reset pin to be directly connected to the uController reset. How would I need to trigger a reset, using the TCAN1146?

By reconfiguring a GPIO pin during CS and CS_N is what I expect should be implemented, but if the uController gets stuck, how do I know that the interrupt is selected in the GPIO?

Thanks! Mike

  • 0
    TI__Guru 53555 points

    Hi Mike,

    The interrupt pin for this device indeed should not be connected to the MCU reset pin as the pin will need to serve different functions during separate operating conditions. An example use of the pin as a watchdog output would be to trigger an interrupt on the MCU that could potentially pull it out of a stuck subroutine. 

    A more conventional watchdog reset can be achieved by configuring the watchdog trigger action to pulse INH output (13h[1:0] = 00b). Doing so would disable any voltage regulators that are enabled by this signal, forcing a power cycle of the system. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott