• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 258 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.

TCAN1044A-Q1: bus status in STB

Daniel Wang (auto)
Expert 3500 points
Part Number: TCAN1044A-Q1

Tool/software:

Hello team,

For 1044A and 1462, can the STB be awakened by setting to high when VCC is out of power and VIO is powered?

I see that the two states are inconsistent on the bus for 1044 and 1462. What does it mean that RXD is invisible? Is it not responding to any CAN wake-up?

Thanks!

Regards,

Daniel Wang

  • 0
    TI__Mastermind 27690 points

    Hi Daniel,

    VIO is only available on TCAN1044AV-Q1 and TCAN1462V-Q1, the non-V version doesn't have VIO pin.

    Daniel Wang (auto) said:
    For 1044A and 1462, can the STB be awakened by setting to high when VCC is out of power and VIO is powered?

    Yes, on TCAN1044AV-Q1 remote wakeup is still available if only VIO supplied. In standby mode, only the VIO supply is required.

    Daniel Wang (auto) said:
    What does it mean that RXD is invisible? Is it not responding to any CAN wake-up?

    It's actually "recessive" here, means RXD is always high and won't respond to wake-up pattern.

     

    Regards,

    Sean

  • 0 in reply to Sean Guo
    TI__Expert 3500 points

    Hello Sean,

    Thanks for your support.

    1. Under the conditions of VCC<UVvcc and VIO>UVvio, how can the chip switch to normal mode after entering the standby mode? Are there timing requirements for STB and VCC?
    2. Under the conditions of VCC<UVvcc and VIO>UVvio, how can the chip switch to normal mode after entering the protected mode? Are there timing requirements for STB and VCC?

    Thanks!

    Regards,

    Daniel Wang

  • 0 in reply to Daniel Wang (auto)
    TI__Mastermind 27690 points

    Hi Daniel,

    Daniel Wang (auto) said:
    1. Under the conditions of VCC<UVvcc and VIO>UVvio, how can the chip switch to normal mode after entering the standby mode? Are there timing requirements for STB and VCC?

    VCC supply need rise above the UVCC threshold, otherwise the chip cannot switch to normal. 

    Daniel Wang (auto) said:

    2. Under the conditions of VCC<UVvcc and VIO>UVvio, how can the chip switch to normal mode after entering the protected mode? Are there timing requirements for STB and VCC?

    After pulling STB low, the chip will first enter protected mode, then once VCC > UVCC rise threshold, the chip will enter normal mode.

    Regards,

    Sean