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CAN-Slide5

The filters discussed here are used to reduce the noise at the transceiver’s bus pins. RC and LC are both low pass filters. Common mode chokes attenuate the noise. It is very important for the components to match. Any mismatch will cause unbalanced filtering/attenuation between CANH and CANL which will result in distortion of the signal. Additionally, these filter circuits do not provide any voltage clamping; they only provide filtering. Also, the filter components are susceptible to high energy transients and can be damaged. We’ll discuss how to protect these circuits later.

PTM Published on: 2011-11-02