Design of Vehicle-mounted CAN Interface circuit

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Design of Vehicle-mounted CAN Interface circuit

The crystal oscillator circuit generates high-precision clock signals through the piezoelectric effect and is the "heartbeat" core of digital systems. When designing, it is necessary to be close to the load chip and shorten the clock trace length (<50mm). Stay away from high-speed signal lines with a spacing of no less than 3 times the line width. Avoid approaching noise sources such as power modules and motor drives. If necessary, isolate them on the ground level. A complete ground plane is laid beneath the crystal oscillator, providing a low-impedance return path. Series resistance reduces edge rate. Magnetic beads are used to filter out interference on the power supply and suppress noise. The impedance selection range is 100Ω@100MHz to 1000Ω@100MHz, with a typical value of 120Ω@100MHz. When selecting magnetic beads, the current-carrying capacity should meet the requirements of the circuit current. The crystal oscillator housing should be grounded, with a local shielding cover (copper foil or metal cover, well-grounded) to prevent other signal lines from running under the crystal oscillator and avoid crosstalk.

Vehicle-mounted CAN Interface circuit design scheme

SMB06J24BC
CMF4532WA121MQT