SLOS346O MARCH   2001  – April 2018 SN65HVD230 , SN65HVD231 , SN65HVD232

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Equivalent Input and Output Schematic Diagrams
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1  Absolute Maximum Ratings
    2. 8.2  ESD Ratings
    3. 8.3  Recommended Operating Conditions
    4. 8.4  Thermal Information
    5. 8.5  Electrical Characteristics: Driver
    6. 8.6  Electrical Characteristics: Receiver
    7. 8.7  Switching Characteristics: Driver
    8. 8.8  Switching Characteristics: Receiver
    9. 8.9  Switching Characteristics: Device
    10. 8.10 Device Control-Pin Characteristics
    11. 8.11 Typical Characteristics
  9. 9 Parameter Measurement Information
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 Vref Voltage Reference
      2. 10.3.2 Thermal Shutdown
    4. 10.4 Device Functional Modes
      1. 10.4.1 High-Speed Mode
      2. 10.4.2 Slope Control Mode
      3. 10.4.3 Standby Mode (Listen Only Mode) of the HVD230
      4. 10.4.4 The Babbling Idiot Protection of the HVD230
      5. 10.4.5 Sleep Mode of the HVD231
      6. 10.4.6 Summary of Device Operating Modes
  11. 11Application and Implementation
    1. 11.1 Application Information
      1. 11.1.1 CAN Bus States
    2. 11.2 Typical Application
      1. 11.2.1 Design Requirements
        1. 11.2.1.1 CAN Termination
        2. 11.2.1.2 Loop Propagation Delay
        3. 11.2.1.3 Bus Loading, Length and Number of Nodes
      2. 11.2.2 Detailed Design Procedure
        1. 11.2.2.1 Transient Protection
        2. 11.2.2.2 Transient Voltage Suppressors
      3. 11.2.3 Application Curve
    3. 11.3 System Example
      1. 11.3.1 ISO 11898 Compliance of SN65HVD23x Family of 3.3 V CAN Transceivers
        1. 11.3.1.1 Introduction
        2. 11.3.1.2 Differential Signal
          1. 11.3.1.2.1 Common Mode Signal
        3. 11.3.1.3 Interoperability of 3.3-V CAN in 5-V CAN Systems
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Related Links
    2. 14.2 Receiving Notification of Documentation Updates
    3. 14.3 Community Resources
    4. 14.4 Trademarks
    5. 14.5 Electrostatic Discharge Caution
    6. 14.6 Glossary
  15. 15Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

11.2.1.1 CAN Termination

The ISO11898 standard specifies the interconnect to be a single twisted pair cable (shielded or unshielded) with 120 Ω characteristic impedance (ZO). Resistors equal to the characteristic impedance of the line should be used to terminate both ends of the cable to prevent signal reflections. Unterminated drop lines (stubs) connecting nodes to the bus should be kept as short as possible to minimize signal reflections. The termination may be on the cable or in a node, but if nodes may be removed from the bus the termination must be carefully placed so that it is not removed from the bus.

SN65HVD230 SN65HVD231 SN65HVD232 typ_CAN_bus_llsea2.gifFigure 38. Typical CAN Bus

Termination is typically a 120 Ω resistor at each end of the bus. If filtering and stabilization of the common mode voltage of the bus is desired, then split termination may be used (see Figure 39). Split termination utilizes two 60Ω resistors with a capacitor in the middle of these resistors to ground. Split termination improves the electromagnetic emissions behavior of the network by eliminating fluctuations in the bus common mode voltages at the start and end of message transmissions.

Care should be taken in the power ratings of the termination resistors used. Typically the worst case condition would be if the system power supply was shorted across the termination resistance to ground. In most cases the current flow through the resistor in this condition would be much higher than the transceiver's current limit.

SN65HVD230 SN65HVD231 SN65HVD232 CAN_bus_term_llsea2.gifFigure 39. CAN Bus Termination Concepts