All Questions
Tagged with can termination
43
questions
0
votes
3
answers
151
views
Add or remove 120 Ohm from the CAN circuit using Microcontroller
I want to design hardware circuit using microcontroller for CAN communication. One suggestion i require is i want to add 120 Ohm or remove it based on software configuration. I want to close the ...
- 4,501
1
vote
3
answers
140
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GPIO controlled CAN bus termination technique
I have tried to design a circuit for controlling the CAN bus 120 Ohms termination resistance by using a 3.3V GPIO from a STM32 MCU.
In the SSR datasheet, it specifies that the LED voltage should ...
- 79
0
votes
1
answer
60
views
CAN BUS Termination resistor sizing
I am using ISO1042 CAN Transceiver to establish communication between my board micro-controller with other board controller separated by 0.5m distance. I am using standard 120 ohm termination ...
- 19.6k
1
vote
1
answer
41
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Is a CAN bus device necessary at the end of the terminated network line?
I am designing a CAN bus network with three devices near one end and one device at the other end about 8' away. As long as I retain the terminator at the far end, is a device at the far end required ...
- 2,364
7
votes
2
answers
309
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Novel CAN bus design - needs criticism
I'm designing a CAN bus interface for a PCB I'm working on. CAN and high speed/long distances are new to me, so I have a list of concerns about my design ideas, and I would appreciate someone with ...
- 88
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0
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89
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CAN FD termination with plugged in modules
Is it possible to use CAN FD in scenario in which there is single main device and additional modules are plugged or hot plugged into each another?
MAIN->MOD1->MOD2->MODn
The main device will ...
- 137
5
votes
1
answer
1k
views
Coax cable with CAN bus
I got some Microchip CAN transceivers and some Stellaris Launchpads from TI. I would like to learn how CAN works. It looks very nice for what I want to do (one controller per room, controls lights, ...
- 9,270
3
votes
2
answers
4k
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CAN Split Termination Capacitor Calculation
I'm trying to use the split termination on a CAN bus, but I'm a bit confused about the calculation for the split termination capacitor. It is described in Figure 10 in the Texas Instruments app note ...
4
votes
0
answers
152
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Is there an antenna problem with CAN Bus selectable split termination header pin?
I am trying to implement a jumper-selectable CAN Bus termination with a SPLIT configuration, as shown in this Analog Devices example:
https://www.analog.com/media/en/technical-documentation/user-...
- 355
1
vote
2
answers
2k
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Should I remove the termination resistor from the CAN Bus transceiver module?
I develop a CAN-BUS receiver (logger) with an ESP32 and CAN-BUS transceiver.
The CAN-BUS transceiver modules which I found and bought have both 120 Ohm termination resistors. But the CAN-BUS to which ...
- 293
1
vote
2
answers
2k
views
CAN Bus termination resistor in only 2 device connection
A termination resistor in CAN ( .. or other differential pair communication like RS485 ) is necessary to absorb reflection. The value is related to wire length, electrical frequency, baud rate. It ...
- 2,216
41
votes
4
answers
175k
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Why does the CAN bus use a 120 ohm resistor as the terminating resistor and not any other value?
I know the reasons for using terminating resistors on a CAN bus and how important it is.
But why 120 ohm? How did this value come up? Is there any specific reason to use 120 ohm?
- 371
0
votes
2
answers
992
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Tap into CAN bus
I'm thinking about tapping into an existing CAN bus. I'm going to attach in a middle point, and I don't want to introduce any issue in the original bus.
In order not to disturb the original bus with ...
- 12.4k
1
vote
1
answer
6k
views
Proper CAN bus termination
I've been struggling with getting CAN bus transmission to work properly. I'm driving the setup with a Parallax Propeller board and the specifics are in another post, but I have a more specific ...
0
votes
0
answers
412
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CAN bus termination resistor
I'm trying to design a CAN device where the user can select which device is the beginning/end device and activate the 120 ohm resistor accordingly. I've seen some examples using a switch, but I'm ...
- 201