| Electronics > Projects, Designs, and Technical Stuff |
| Isolated CAN ground connection |
| << < (3/5) > >> |
| AndersJ:
Thanks, exactly the type of comment I was hoping for. It's interesting that you mention the other options. I have been considering the: * Texas SN6501 driver * Wurth 760390014 transformer * Texas ISO7721 digital isolator The above components are taken from Texas Instruments App note TIDA-01487. Yes, single source, sort of, but not as single as the ADM3053. |
| tru3533:
CAN bus signals have nothing to do with ground! The CAN bus is an differential bus, meaning the voltage forming the bits is measured between the CANH and CANL wires. So if noise interference happens, it will be implemented on both lines, and this will not cause any problems as we are measuring between the CANH and CANL wires. (same thing happens on RS485) RS232 is referenced to ground, here noise is catastrophic as the ground is not floating. Also notice the twisting of the CAN wires, this is very important as this will cancel the noise. |
| Jeroen3:
Check the Silicon Laboratories Si8622 isolators. |
| AndersJ:
--- Quote from: tru3533 on September 04, 2019, 09:31:47 pm ---CAN bus signals have nothing to do with ground! The CAN bus is an differential bus, meaning the voltage forming the bits is measured between the CANH and CANL wires. So if noise interference happens, it will be implemented on both lines, and this will not cause any problems as we are measuring between the CANH and CANL wires. (same thing happens on RS485) --- End quote --- Grounding does not always concern only noise. It is also needed to keep tranceivers within reasonable common mode levels, especially on long cables between remote locations. |
| tru3533:
From my point of view you only need isolated CAN bus for your test equipment. |
| Navigation |
| Message Index |
| Next page |
| Previous page |