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

11.2.1.2 Loop Propagation Delay

Transceiver loop delay is a measure of the overall device propagation delay, consisting of the delay from the driver input (D pin) to the differential outputs (CANH and CANL pins), plus the delay from the receiver inputs (CANH and CANL) to its output (R pin).

A typical loop delay for the SN65HVD230 transceiver is displayed in Figure 40. This loop delay will increase as the slope of the driver output is slowed during slope control mode. This increased loop delay means that there is a tradeoff between the total bus length able to be used and the driver's output slope used via the slope control pin of the device. For example, the loop delay for a 10-kΩ resistor from the RS pin to ground is ~100 ns, and the loop delay for a 100-kΩ resistor is ~500 ns. Therefore, if we use the following rule-of-thumb that the propagation delay of typical twisted pair bus cable is 5 ns/m, we can calculate an approximate cable length trade-off between normal high-speed mode and slope control mode with a 100-kΩ resistor. Using typical values, the loop delay for a recessive to dominant bit with RS tied directly to ground is 70ns, and with a 100-kΩ resistor is 535 ns. At 5ns/m of propagation delay, which you have to count in both directions the difference is 46.5 meters (535-70)/(2*5).

Another option to improving the elctromagnetic emissions of the device besides slowing down the edge rates of the driver in slope control mode is using quality shielded bus cabling.

SN65HVD230 SN65HVD231 SN65HVD232 ai_wave3_los346.gifFigure 40. 70.7-ns Loop Delay Through the HVD230 With RS = 0