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Why Two pairs of CAN_H and CAN_L going into One CAN Transceiver ?

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jani12

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Attached is CAN Transceiver Datasheet. This IC is wired in our Microcontroller based Electronic Control Unit.

CAN_A_H1 and CAN_A_L1 are connected to CANH and CANL of Transceiver. Also, CAN_A_H2 and CAN_B_H2 are connected to same CANH and CANL ?
 

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  • TJA1145T_FD Transceiver.pdf
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I think we need to see some of your schematic to know for certain what you are asking about.
But I would guess/assume that since this appears to be a single channel transceiver part (there are 2-channel CANBus chips available also) that your schematic simple is connecting this chip's CANbus lines to more than one connector on the PCB. I cannot find your text "CAN_B_H2" or others node/netnames in the attached datasheet.
 

Nodes names won't be on the CAN Transceiver datasheet.

Datasheet has two pins for one pair but there are two pairs going into these two pins.
 

>>Nodes names won't be on the CAN Transceiver datasheet.

I know this - I mentioned it because your including it wasn't really useful in your original post. But, a schematic, or portion of it, would have been much better.
I suspect that the designer of the PCB simply provided 2 connectors for attaching the CANbus connection so that wire splices on one connector to continue the bus connections to other nodes in the system would not be necessary. In this way, the connections could be possibly more reliable, or waterproof, or something.
I am having to infer all this from pure guesses however, as you have not provided any more information about the board or how or where it is used.
 
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