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TCAN2451-Q1: TCAN2451-Q1: Sleep mode strategy in TCAN2451

Nishant Kumar
Prodigy 82 points
Part Number: TCAN2451-Q1

Tool/software:

Hello All,
We have implemented the TCAN sleep mode strategy in the following sequence. 
1. MCU is powered up with through VCC1 of TCAN. In sleep mode VCC1 and VCC2 will be OFF. So MCU will be OFF. 

2. Once any wakeup event gets generated TCAN will transition from Sleep>Restart>Standby>Normal.  Once TCAN transitions to Standby Mode VCC1 will ramp up and Power the MCU. We can identify which wakeup event (either from Wake1, 2... or CAN wakeup) occurred, either through SPI interface or CAN interface.

Parker, please let me know if this strategy is correct.

And I have one more doubt like, once the TCAN transitions to Normal mode, can we use Wakeup pins as normal Digital input pins for other purposes?
And Watchdog is SPI based?

Expecting for the feedback on the same!!

Thanks, and Regards
Nishant

  • 0
    TI__Guru 52172 points

    Hi Nishant,

    For your overall process there is one detail that is incorrect - the VCC1 supply will start ramping in Restart mode - when the VCC1 has ramped up and is stable the SBC will then transition to standby mode. Both VCC1 and VCC2 will ramp up in restart mode - but only VCC1 is required to be up and stable to enter into standby mode. Beyond that it looks okay. 

    You can use Wake pins during normal operation - they will generate interrupts - but that is basically all they will do when in standby and normal modes. So they can be used to indicate to the MCU that they have detected a wake signal but they won't really change how the SBC is acting if using standard wake on these pins. Essentially they work as programmed in standby and normal mode. 

    Yes watchdog is SPI based. You write the watchdog trigger (according to device configuration) into register address 0x15. The main purpose is to ensure SPI communication is working properly. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson