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TPS65381A-Q1: questions about STANDBY and RESET mode

Shinichi Inoue
Guru 19671 points
Part Number: TPS65381A-Q1

Dear Specialists,

My customer is considering TPS65381.

At this time, he has questions about STANDBY and RESET mode.

Could you please advise?

---

(Q1)

When an error occurs in TPS65381, and then go to STANDBY state.
If CANHWU is GND stable and IGN is pulled up, unless IGN become Low to High, it remains STANDBY mode.
Is it correct?

(Q2)

When transfering to RESET State due to an error,
does it make a normal transition regardless of the logic of IGN?

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Mastermind 27535 points
    Hello, thank you for posting your question on the TPS65381 in the e2e forum. Your thread has been assigned to the expert within TI, who will reply to your question as soon as possible and attempt to resolve your issue
  • 0
    TI__Expert 3930 points

    Shinichi,

    A1: Both IGN and CANWU are level-sensitive and are deglitched with a respective deglitch time. Either of them meets the wake-up requirement (high level), device will re-wake-up immediately, even after an event that causes the transition to STANDBY state. So no Low to High transition is needed to re-wake up, only a high level.  Otherwise, the device will stay in standby mode.

    However, the following conditions would prevent the transition from the STANDBY state to the RESET state even if a wake-up request (IGN or CANWU with a high level) is pending:

    – BG_ERR1
    – BG_ERR2
    – VCP17_OV
    – VCP12_OV
    – AVDD_VMON_ERR
    – EE_CRC_CHK fails

    A2. Your question is a little unclear, but we will try to answer it.  Device reaction to an error that causes RESET state will depend on the IGN and CANWU pin levels.  Assuming CANWU or IGN is still high, the device will transition to RESET state, assuming the fault is no longer present the device will be in RESET state for the reset extension time then transition to DIAGNOSIC state as normal. If CANWU and IGN are low the device would transition to STANDBY state.   

    You can find more information about wake-up/states transition in Datasheet 5.3.7, 5.4.21. 

    Hopefully this helps, if you have further question or need further clarifications please continue to ask on this thread.

  • 0 in reply to Dongbao Zhou
    TI__Mastermind 20580 points
    Hi Shinichi-san,

    I edited the initial response this a little to make it more clear. Your Q2 is a little un-clear so I attempted to answer what I think the question was, but if you have further questions please add them here.

    Best Regards,
    Scott
  • 0 in reply to Adam Mc Gaffin
    Guru 19671 points
    Hi Adam,

    Thank you for your reply and arranging.

    I confirm the answer from Dongbao and Scott.

    And then I'll consult them.

    I appreciate your great help.

    Best regards,

    Shinichi
  • 0 in reply to Shinichi Inoue
    Guru 19671 points
    Hi Scott and Dongbao,

    Thank you for your response.

    First of all I send your answer to the customer, I confirm his feedback.

    If he has additional queation, I'll consult with you.

    I appreciate your great help and cooperation.

    Best regards,
    Shinichi