SLLU314 March   2020 ISO1044

 

  1.   ISO1044 Isolated CAN Transceiver Evaluation Module
    1.     Trademarks
    2. 1 Introduction
    3. 2 Overview
    4. 3 Pin Configuration of the ISO1044 CAN Transceiver
    5. 4 ISO1044 Board Block Diagram and Image
    6. 5 EVM Schematics and Layout
    7. 6 Bill of Materials
      1. 6.1 Bill of Materials
    8. 7 EVM Setup and Operation
      1. 7.1 Protection Configurations

7.1 Protection Configurations

The EVM also has footprints for various protection schemes to enhance robustness for extreme system level EMC requirements. Figure 7 summarizes these options

Figure 7 shows typical input and output waveforms of the EVM for a 5-Mbps signal. TXD is shown as Channel 1, the CAN bus is shown as Channel 2, Channel 3 and RXD is shown as Channel 4.

ISO1044 Waveforms.pngFigure 7. Typical Input and Output Waveforms
Configuration Footprint Reference Use Case Population and Description
Series resistors or common mode choke R1/R5 or L1 Direct CAN transceiver to bus connection R1 and R5 populated with 0Ω
Series resistance protection, CAN transceiver to bus connection R1 and R14 populated with MELF resistor as necessary for harsh EMC environment
CM choke (bus filter) L1 populated with CM choke to filter noise as necessary for harsh EMC environment (Default Population)
Bus filtering caps and transient protection C8/C9 Bus Filter Filter noise as necessary for harsh EMC environment. Use filter caps in combination with L1 CM choke
C8/C9 or D1 Transient and ESD protection To add extra protection for system level transients and ESD protection. TVS diode population option via D1 footprint or varistor population through C2/C7 footprint.