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The difference of WD_ER and WD_FAIL

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: TPS65381-Q1

Hi

Could you let me know the difference of WD_ER and WD_FAIL?
I think that WD_EER and WD_FAIL is same from datasheet content.

Thanks
Shimizu

  • 0
    TI__Expert 5380 points

    Shimizu-san,

    Could you specify the part number of this device so that we can find a suitable engineer to help you?

    Thanks

    Anda Zhang

  • 0 in reply to Anda Zhang
    Guru 11235 points

    Hi Anda-san

      Thank you for your support.

      I'm sorry. I forgot to suggest my using device.

      I am using TPS65381-Q1.

    Best regard,

    Shimizu

      

     

  • 0 in reply to masahiko shimizu
    TI__Expert 5380 points

    Shimizu-san,

    The appropriate Applications Engineer has been assigned to answer your question. You can expect a follow-up response within a few days.

    Anda

  • 0 in reply to Anda Zhang
    TI__Mastermind 20580 points

    Hi Shimizu-san,

    WD_ERR is a status bit in SAFETY_STAT_4 Register that indicated when the Watchdog (WD) fail counter has reached 7.  This bit is set to 1 when a watchdog fail counter reaches a count of 7 (WD_FAIL_CNT [2:0] in SAFETY_STATUS_2 register) only if bit WD_RST_EN (SAFETY_FUNC_CFG, bit 3) is set to 1. 

    WD_Fail is a single failure of the watchdog, such as a trigger in the closed window, a missing trigger in the open window or a timeout (no trigger).  The device is initialized with the watchdog fail counter at 5 and a good watchdog event will decrement the counter and a bad watchdog event will increment the counter.  Once the counter reaches 7 the next bad event will overflow the counter and will increment the device error counter and if the WD_RST_EN is set the device will also set the NRES low and reset the attached microprocessors. 

    Please see the sections in the datasheet on Watchdog starting at 5.4.1.11 and continuing to 5.4.1.14.4.  WD_ERR is at 5.5.3.6.  WD_ERR basically shows the full accumulation (increments and decrements) of WD fails if the WD Fail counter overflows.

    - Scott

  • 0 in reply to Scott Monroe
    Guru 11235 points

    Hi Scott-san

     Thank you for your support

     I understood.

    Thanks

    shimizu