General > General Technical Chat

Car Manufacturers Ruined a Serial Communication Protocol

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Jeroen3:
Lol
CAN tranceivers are made everywhere, they are big silicon, no need for tsmc. iirc even the aged philips fab in nijmegen can make them.

https://nl.farnell.com/microchip/mcp2551-i-sn/ic-can-transceiver-hi-speed-smd/dp/9758569?st=mcp2551
69.509 In stock
12.000 meer zal beschikbaar zijn op 15-10-22
15.200 meer zal beschikbaar zijn op 16-12-22
15.200 meer zal beschikbaar zijn op 20-4-23

But try getting an MCU with CAN....

tom66:
Try getting an MCU!   Getting it with CAN is just icing on the cake!

eugene:
I've used MCU's with CAN peripherals, but they all still require an external transceiver. They handle (some of) the ugly details of the protocol, but they can't drive a bus. (Ralph Kramden, where are you?)  Are there MCU's with built in CAN transceivers?

tom66:

--- Quote from: eugene on May 26, 2022, 07:00:44 pm ---I've used MCU's with CAN peripherals, but they all still require an external transceiver. They handle (some of) the ugly details of the protocol, but they can't drive a bus. (Ralph Kramden, where are you?)  Are there MCU's with built in CAN transceivers?

--- End quote ---

I've certainly seen an MCU on an ECM which had CAN traces going directly into it, implying they do exist.  It was an automotive-specific Freescale chip with of course no datasheet publicly available.

This probably requires quite a large amount of die space and I wonder how resilient these are to the common faults, like 28V directly to CAN_H/CAN_L which is something most transceiver chips survive.

hans:
LPC Cortex-m0+ series also had an integrated CAN transceiver.

I also see 100k MCP2551 CAN transceivers in stock at Mouser. They work just fine and are a bargain.

How you replace CAN with I2C I don't know. Please don't I2C offboard, would'ya? It's an EMC and troubleshooting nightmare.

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