please explain what happens when CANH is shorted to VBAT, CANH shorted to GND, CANL shorted to VBAT and CANL shorted to GND?

Sanjay Chaursiya

Other Parts Discussed in Thread: TCAN1044-Q1, TCAN1042-Q1

over 5 years ago

0 Miguel Robertson over 5 years ago

TI__Guru 62920 points

Hi Sanjay,

Which CAN transceiver are you using? I've attached an explanation of how our TCAN10xx-series devices would respond to different wiring faults. I hope it is helpful to you.

Regards,
MaxTCAN10xx Bus Failure Behaviors.pdf

0 Sanjay Chaursiya over 5 years ago in reply to Miguel Robertson

Prodigy 30 points

Hi Max,

Thanks for your response.

I am using CANpiggy 251mag - transceiver used is 82C251.

0 Miguel Robertson over 5 years ago in reply to Sanjay Chaursiya

TI__Guru 62920 points

Sanjay,

That transceiver is not made by TI. I can't comment definitively on its behavior. If you are interested in evaluating a TI device, I would recommend either TCAN1042-Q1 or TCAN1044-Q1. Both are pinout-compatible and feature improvements like wider CANH/CANL voltage ratings and higher ESD immunity.

Max

0 Sanjay Chaursiya over 5 years ago in reply to Miguel Robertson

Prodigy 30 points

Hi Max,

Can you please provide some information in which CAN transceiver I can achieve BUS OFF failure when CAN H is Shorted to BAT+ and CAN L shorted to GND.

0 Miguel Robertson over 5 years ago in reply to Sanjay Chaursiya

TI__Guru 62920 points

Hello Sanjay,

As long as this condition is within the supported voltage ranges of the device, any transceiver should report this condition as a static dominant state on the bus (provided the battery voltage is at least 900 mV). It would be up to the controller used to interpret this condition as a fault and transition to the bus off state.

Regards,
Max

Arm-based microcontrollers

Arm-based microcontrollers forum

please explain what happens when CANH is shorted to VBAT, CANH shorted to GND, CANL shorted to VBAT and CANL shorted to GND?