SLLU385A July   2024  – September 2024

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1.     Jumper Information
    2. 2.1 EVM Setup and Operation
      1. 2.1.1 Overview and Basic Operation Settings
        1. 2.1.1.1  VCC Power Supply (J3, P2, TP10)
        2. 2.1.1.2  I/O Power Supply VIO or VRXD (J3, J8, P1,or TP9)
        3. 2.1.1.3  Main Supply and I/O Header (J3)
        4. 2.1.1.4  TXD Input (J3 or TP5)
        5. 2.1.1.5  RXD Output (J3 or TP6)
        6. 2.1.1.6  Generic Pin 8 (J2, J3, or TP3)
        7. 2.1.1.7  Pin 8 - J2 Configurations (3-Way Jumper)
        8. 2.1.1.8  TP3 Configuration
        9. 2.1.1.9  Generic Pin 5 (J1, J3 or TP1)
        10. 2.1.1.10 Pin 5 – J1 Configurations (4-Way Jumper)
        11. 2.1.1.11 TP1 Configuration
        12. 2.1.1.12 J8 Configuration
        13. 2.1.1.13 SIC Network Configuration (J4 & J5)
      2. 2.1.2 Using CAN Bus Load, Termination, and Protection Configurations
      3. 2.1.3 Using Customer Installable I/O Options for Current Limiting, Pullup and Pulldown, Noise Filtering
  7. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  8. 4Additional Information
    1. 4.1 Trademarks
  9. 5Revision History

2.1.2 Using CAN Bus Load, Termination, and Protection Configurations

The generic 8-pin CAN EVM is populated with one 120Ω resistor selectable via jumper, between CANH and CANL, and the 120Ω split termination (two 60Ω resistors in series) including the split capacitor. When using only split termination, the EVM is used as a terminated end of a bus. For electrical measurements to represent the total loading of the bus, use both the split termination and the 120Ω resistor in parallel to give the standard 60Ω load for parametric measurement. Table 2-3 summarizes how to use these termination options.

Table 2-3 Bus Termination Configuration
Termination Configuration 120Ω Resistor Split Termination

Resistors

 Split Termination Capacitor
J6 R10 R14 C3
60Ω load - electrical parameterics shorted 60Ω 60Ω populated
Split termination (common mode stabilization) open

The EVM also has footprints for various protection schemes to enhance robustness for extreme system-level EMC requirements. Table 2-4 summarizes these options.

Table 2-4 Protection and Filtering Configuration
Configuration Footprint Reference Use Case Population and Description
Series resistors or common mode choke R8/R12 or L1 (common footprint) Direct CAN transceiver to bus connection R8 and R12 populated with 0Ω (default population)
Series resistance protection, CAN transceiver to bus connection R8 and R12 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
Bus filtering caps transient protection C2/C4 Bus filter Filter noise as necessary for harsh EMC environment. Use filter caps in combination with L1 CM choke
D1 Transient and ESD protection To add extra protection for system level transients and ESD protection,

D1 populated with ESD2CAN24-Q1