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ISO1050: Short the CANBUS Line

Brian Wang0928
Genius 14210 points
Part Number: ISO1050


What happens if i short the two line of CANH and CANL? Does the CAN bus work to transmission of recessive bits continuously? Very thanks. 

Regards,

Brian

  • 0
    TI__Guru 55815 points

    Hi Brian,

    Your understanding is correct, when CANH and CANL are shorted together RX will see a continuous recessive bit (HIGH). Please do note that under this condition if TX is driven dominant (LOW), there will be a large current flow from VCC2 to GND2 and this current is expected to be upto the short-circuit steady-state output current, IOS(SS). Since ISO1050 has dominant time-out of max 700us, the large current flow from VCC2/GND2 should stop after dominant time-out and device should wait for TX to go recessive. Thanks.


    Regards,
    Koteshwar Rao