Electronic – CAN bus with CANL only

cansingle-ended

I'm interfacing a product that operates on a kind of CAN bus. Specifically, it uses the CANL line only.

I'd like to use a transceiver I've used before, the MCP2562, and I suspect there's not likely to be any problem transmitting, but will it receive with nothing connected to the CANH line?

How should I manage termination in this instance?

The bus operates at 1Mbit and my logic analyzer measures levels of 0.9V dominant and 1.8V recessive. I realise these are not standard CAN levels. The frame format is CAN, but I'm happy to use an alternative transceiver type if I can achieve the same levels and it manages the line correctly.

Any help much appreciated !

Best Answer

I've just discovered that there are heaps of CAN transceivers that operate at 3V3, and thus have a 1.9V recessive voltage (yes, they can only speak to other CAN devices that operate at 3V3). This solves the levels part of my question, I'll use the tip provided by @'Tony Stewart Sunnyskyguy EE75' to try and hold CANH steady and see where I land.

Thanks!

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