All Questions
Tagged with can termination
43
questions
3
votes
2
answers
4k
views
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 ...
- 1,197
1
vote
2
answers
2k
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Selectable CAN bus split termination
I am designing a CAN device where the user may switch between it being the end device and thus with terminators or vice versa.
Now, there is no need to drive it digitally using MCU, I would actually ...
- 38
1
vote
1
answer
308
views
Does the standard termination of 120 ohm really suppress reflections in recessive state in CAN?
Suppose we have a multi-node CAN network with the ends of transmission line terminated with the standard 120 ohm. When the recessive state is on the transmission line, the voltage on both CAN_H and ...
0
votes
1
answer
837
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CAN BUS Termination Resistors For CAN Logger Device
I am making a CAN logger device that will be connected to the vehicle OBD port. Since the CAN bus inside the vehicle is already terminated, do I need to terminate the BUS lines on my device end, right ...
- 383
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
2
votes
3
answers
998
views
CAN Physical Layer With Different Characteristic Impedance
The company I have been working for, which is designing a new control system for forestry equipment, has encountered a number of problems with regards to the CAN bus it is using for communication. I ...
- 21
0
votes
1
answer
140
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Do I need to measure impedance before every CAN termination?
Background: I need to set up a CAN bus between different components of an electric UAV (battery management system, motor inverter, autopilot, etc.). My avionics/networking experience up to now ...
- 456
3
votes
1
answer
1k
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How would I place CAN termination resistors in a 3 ended configuration?
I have a project for which I have one central circuit board which has a can node on it, this central circuit board has three connectors on each of which a node could or could not be plugged in with a ...
- 127
3
votes
1
answer
6k
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The CAN bus in this vehicle has only one 120 ohm termination resistance. What problems would this provoke?
This vehicle that I've started co-developing is designed with only a 120 termination resistor on the CAN bus. Obviously there should be two of those resistors on two ends of the bus. I will be making ...
- 133
2
votes
1
answer
3k
views
Common mode choke parameters CAN circuitry - split termination concept
I am trying to the understand the important parameters of a common mode choke that will be placed at the CANL and CANH lines of a transceiver.
First parameter: Impedance as function of frequency - I'...
- 41
2
votes
3
answers
3k
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How far can a terminating resistor be from the literal end of a CAN bus?
I'm wondering if anyone knows if there is an upper limit for the distance a terminating resistor can be from the literal end of the CAN bus or where the last node is.
We have an HMI that is connected ...
- 53
1
vote
0
answers
570
views
How does the data rate of a CAN bus affect the value of the capacitor used in a split termination scheme?
I'm helping to redesign the CAN bus of an electric car, and we're interested in achieving higher data rates of up to 8 Mbit/s. We have a transceiver selected, a CMC to reduce inductively coupled ...
- 11
2
votes
1
answer
489
views
Terminator in Raspberry Pi CAN-shield
I am planning to connect (at least) two Raspberry Pi + PiCAN2 shields via CAN.
I think I understand the concept of a daisy-chained multidrop CAN line, but what about using the 120 ohm resistors for ...
- 180
1
vote
1
answer
240
views
CAN bus cable-termination mismatch
I am trying to change the CAN cables alone to Cat 6 cables (which has 100 ohm characteristic impedance). The existing cable has 120 ohm impedance. By making this change to Cat 6 cables, I am ...
- 11
1
vote
1
answer
238
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Check of my first Eagle boards
I am attaching two boards I have just designed in Eagle and would appreciate if any expert around here willing to take a quick look would flag any obvious errors in the design.
There is one board ...
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