• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 35 subscribers
  • Views 455 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.

TCAN1043-Q1: INH status after Power-ON of TCAN1043 and SN65HVDA100

NOBUO FUJIHARA
Genius 10025 points

Part Number: TCAN1043-Q1
Other Parts Discussed in Thread: SN65HVDA100, TCAN1043

Hi Champs,

My customer monitored unexpected behavior in INH of both TCAN1043 and SN65HVDA100, as shown in attached file.

Could you check and answer for the question?

In parallel I'm confirming to the customer about the length of Vbattery-off period, and whether Vbattery signals were measured just at Vsup pin of the devices.

Best regards,Question about INH status.xlsx

  • 0
    TI__Guru 74922 points
    Fujihara-san,

    I can't quite read the time resolution of the oscilloscope screenshot, is it 1 second per division?

    This is not expected behavior, the device should start up with INH high if going into Standby/Normal mode, which on a power cycle it should. What are the states of the VCC and VIO pins in this situation?

    And yes, checking the voltage at the VSUP pins would be better to look at, capacitance may be keep the voltage high enough on the pins to where it doesn't actually power cycle, and it remains in Sleep mode.

    Regards,
  • 0 in reply to Eric Hackett
    TI__Genius 10025 points

    Hi Eric-san,

    Thanks for your reply.

    Customer checked and confirmed that Vsub kept High in case of "Vsup-OFF while devices are in Sleep mode".

    After getting enough Vsup-off period, INH are set High after Vsup recovered, so "unexpected behavior" is closed.

    Customer asked another question, so I will post it to new thread.

    Best regards,