In CAN (Controller Area Network) systems, proper termination is essential to maintain signal integrity and prevent reflection issues. Here are the common termination methods:
1. Standard 120Ω Termination
- The most widely used method.
- A 120Ω resistor is placed at both ends of the CAN bus.
- Ensures proper impedance matching to eliminate signal reflections
- 120 ohms comes from the twisted pair cable impedance
2. Split Termination (Improved Noise Reduction)
- Uses two 60Ω resistors with a capacitor (e.g., 10nF) in between.
- Enhances EMI (Electromagnetic Interference) suppression.
- Helps in stabilizing common-mode voltages.
Typical value of capacitor is 4.7nF in split termination.