Car Manufacturers Ruined a Serial Communication Protocol - Page 1
Forum section: electronics / general

author: MuhScopeBroke
author_rank: Contributor
timestamp: May 23, 2022, 03:27:55 pm
content: CAN has gone to the wind now that you can't source the IC necessary to interface with it. Most of my companies serial communication has now moved towards I2C/DI2C in light of this but some older parts still use CAN and its been impossible to find components. Very tough on us little guys who just need a simple CAN transceiver

author: Scrts
author_rank: Frequent Contributor
timestamp: May 23, 2022, 05:00:06 pm
content: As of now:TJA1041 - 2492 @ DigikeyTJA1043 - 145 @ DigikeyTJA1046 - 5875 @ DigikeyTJA1054 - 13472 @ DigikeyI did not check TI or Infineon PNs... Did not check Mouser or Newark...Maybe buy in advance now?

author: langwadt
author_rank: Super Contributor
timestamp: May 23, 2022, 05:09:12 pm
content: Quote from: MuhScopeBroke on May 23, 2022, 03:27:55 pmLCSC has tens of different can transceivers, most of them with +10000 in stock ...

author: tom66
author_rank: Super Contributor
timestamp: May 23, 2022, 05:39:20 pm
content: https://octopart.com/search?q=can+transceiver&currency=USD&specs=0&category_id=5414&in_stock_only=1&sort=median_price_1000&sort-dir=asc&distributor_id=459&distributor_id=12860&distributor_id=2401&distributor_id=819&distributor_id=2402&distributor_id=3702&distributor_id=3261&distributor_id=2628&distributor_id=1106&distributor_id=12676Hundreds of parts in stock from authorised distributors.

author: tooki
author_rank: Super Contributor
timestamp: May 26, 2022, 04:13:12 pm
content: Quote from: MuhScopeBroke on May 23, 2022, 03:27:55 pmYou’re whining that car manufacturers “ruined” a bus standard designed by an auto parts supplier expressly for use in vehicles?

author: Jeroen3
author_rank: Super Contributor
timestamp: May 26, 2022, 04:21:24 pm
content: LolCAN 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=mcp255169.509 In stock12.000 meer zal beschikbaar zijn op 15-10-2215.200 meer zal beschikbaar zijn op 16-12-2215.200 meer zal beschikbaar zijn op 20-4-23But try getting an MCU with CAN....

author: tom66
author_rank: Super Contributor
timestamp: May 26, 2022, 04:33:00 pm
content: Try getting an MCU! Getting it with CAN is just icing on the cake!

author: eugene
author_rank: Frequent Contributor
timestamp: May 26, 2022, 07:00:44 pm
content: 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?

author: tom66
author_rank: Super Contributor
timestamp: May 26, 2022, 07:24:41 pm
content: Quote from: eugene on May 26, 2022, 07:00:44 pmI'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.

author: hans
author_rank: Super Contributor
timestamp: May 27, 2022, 07:09:01 am
content: 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.