• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 128 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: TCAN1044A-Q1 CANL short to GND&CANH short to 12V test

Xiaoxiang Liu
Expert 7475 points
Part Number: TCAN1044A-Q1

Tool/software:

Hi team,

Customer shorted CANL to GND, but found that communication is still possible.

And Customer shorted CANH to 12V battery, but found that communication is still possible.

We would like to understand why the system is still functioning under this condition.

Thanks

Xiaoxiang

  • +1
    TI__Guru 50496 points

    Hi Xiaoxiang,

    Communication is possible if CANH still toggles between recessive ~2.5 V and dominant ~3.5 V when CANL shorted to GND. Likewise, when CANH is pulled to 12 V, the device's common mode voltage tolerates the fault to detect transitions on CANL.

    I.e., controllers can interpret functional communication based on the difference between CANH and CANL I.e., V_CANH - V_CANL, and communication continues as long as sufficient voltage difference is created or maintained by other nodes on the bus, thanks.

    Best Regards,

    Michael.