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TCAN1145-Q1: Fail safe mode

Shinji Tsuji
Genius 14169 points
Part Number: TCAN1145-Q1

Tool/software:

Hi team,

I have some question about fail safe mode. 

Could you answer below questions?

Q1: After entering Fail-safe mode as described in data sheet, if the failure factor is cleared, it is possible to transition to another mode with SPI command

However, to clear the fault, is it possible to clear the fault with command(bit clear state of INT_2), or is it necessary to wait for the actual fault to be removed (e.g. temperature drop at TSD failure)?

Q2: does the SWE timer always start when transitioning to Fail-safe mode? Is it possible to stop the SWE timer under this mode?

Q3: Is the description of the register address in fail-safe mode in the figure below incorrect? Reg8'h10[6] = 0 (FS_DIS) is a typo of Reg8'h17[0] = 0 (FS_DIS), and Reg8'h10[5] = 0 (SWE_DIS) is a typo of Reg8'h1C[7] = 0 (SWE_DIS).

Q4: About the failure-safe mode transition condition - is the setting shown (FS_DIS=0 & SWE_DIS=0) a prerequisite condition? When FS_DIS=0 & SWE_DIS=1 is the mode entered when a fault occurs

regards,

  • +1
    TI__Mastermind 28440 points

    Hi Shinji,

    1. It requires the actual fault to be removed, otherwise the interrupt will set again if you clear it.

    2. Yes the SWE timer will start. The only way to stop the SWE timer is entering normal mode by SPI command. (need to clear the fault first)

    3. Yes it is a typo

    4. FS_DIS need = 0 to enable fail-safe mode, however the SWE_DIS won't affect the transition of fail-safe mode. SWE_DIS can be disabled by set to 1, then the SWE timer will not start in fail-safe mode.

    Regards,

    Sean