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Why is the terminal resistance of the CAN bus 120 Ω
Published Time:
2023-06-14
概要： The terminal resistance of the CAN bus is generally 120 ohms. In fact, when designing, two 60 ohm resistors are connected in series, and there are usually two 120 ohm nodes on the bus. Most people who know a little about the CAN bus know this truth.
The terminal resistance of the CAN bus is generally 120 ohms. In fact, when designing, two 60 ohm resistors are connected in series, and there are usually two 120 ohm nodes on the bus. Most people who know a little about the CAN bus know this truth.
The CAN bus terminal resistor has three functions:
1. Improve anti-interference ability to quickly eliminate high-frequency and low-energy signals;
2. Ensure that the bus quickly enters a hidden state, allowing the energy of parasitic capacitors to dissipate faster;
3. Improve signal quality by placing it at both ends of the bus to reduce reflected energy.
1、 Improve anti-interference ability
The CAN bus has two states: "explicit" and "implicit", with "explicit" representing "0" and "implicit" representing "1", determined by the CAN transceiver. The following diagram is a typical internal structure diagram of a CAN transceiver, with CANH and CANL connected to the bus.
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Why is the terminal resistance of the CAN bus 120 Ω
The terminal resistance of the CAN bus is generally 120 ohms. In fact, when designing, two 60 ohm resistors are connected in series, and there are usually two 120 ohm nodes on the bus. Most people who know a little about the CAN bus know this truth.
2023-06-14
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