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| TI says that 3.3v transceivers are OK for CAN bus. Is their report convincing? |
| (1/2) > >> |
| e100:
According to this http://www.ti.com/lit/an/slla337/slla337.pdf there is no disadvantage to using 3.3v over 5v, or mixing 3.3 and 5v devices on the same bus. |
| T3sl4co1l:
I would expect a reduction in range, but only by a modest ratio, not like orders of magnitude. The common mode emission is annoying, and makes a CMC just about mandatory; but they're commonly found, anyway, so that's probably a non-issue. CAN was derived from RS-485; there's been 3.3V RS-485 transmitters for a long time. The original RS-485 transmitters were implemented in TTL, which only delivers about 3.5V tops, which LVCMOS easily matches. Tim |
| rsjsouza:
Most probably so. AD reference about the same subject: https://www.analog.com/en/technical-articles/can-bus-transceivers-operate-from-33v-or-5v-and-withstand-60v-faults.html EEVBlog "reference": https://www.eevblog.com/forum/projects/can-tranceiver-3-3v/ |
| Scrts:
All automotive designs I've seen so far, even designed today for vehicles to be released in 2022-2023 still use transceivers powered from Vcc=5V, but VIO is set to 3.3V. |
| Tomorokoshi:
We use the TI transceivers from powered from 3.3V with a 125 kbps data rate with no problems. |
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