SLLSES9D February   2016  – October 2021 TCAN1042-Q1 , TCAN1042G-Q1 , TCAN1042GV-Q1 , TCAN1042H-Q1 , TCAN1042HG-Q1 , TCAN1042HGV-Q1 , TCAN1042HV-Q1 , TCAN1042V-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configurations and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 ESD Ratings, Specifications
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Power Rating
    7. 7.7 Electrical Characteristics
    8. 7.8 Switching Characteristics
    9. 7.9 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 TXD Dominant Timeout (DTO)
      2. 9.3.2 Thermal Shutdown (TSD)
      3. 9.3.3 Undervoltage Lockout
      4. 9.3.4 Unpowered Device
      5. 9.3.5 Floating Terminals
      6. 9.3.6 CAN Bus Short Circuit Current Limiting
      7. 9.3.7 Digital Inputs and Outputs
        1. 9.3.7.1 Devices with VCC Only (Devices without the "V" Suffix):
        2. 9.3.7.2 Devices with VIO I/O Level Shifting (Devices with "V" Suffix):
    4. 9.4 Device Functional Modes
      1. 9.4.1 CAN Bus States
      2. 9.4.2 Normal Mode
      3. 9.4.3 Standby Mode
        1. 9.4.3.1 Remote Wake Request via Wake Up Pattern (WUP) in Standby Mode
      4. 9.4.4 Driver and Receiver Function Tables
  10. 10Application Information Disclaimer
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Design Requirements
        1. 10.2.1.1 Bus Loading, Length and Number of Nodes
      2. 10.2.2 Detailed Design Procedures
        1. 10.2.2.1 CAN Termination
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

9.3.1 TXD Dominant Timeout (DTO)

During normal mode (the only mode where the CAN driver is active), the TXD DTO circuit prevents the transceiver from blocking network communication in the event of a hardware or software failure where TXD is held dominant longer than the timeout period tTXD_DTO. The DTO circuit timer starts on a falling edge on TXD. The DTO circuit disables the CAN bus driver if no rising edge is seen before the timeout period expires. This frees the bus for communication between other nodes on the network. The CAN driver is re-activated when a recessive signal is seen on the TXD terminal, thus clearing the TXD DTO condition. The receiver and RXD terminal still reflect activity on the CAN bus, and the bus terminals are biased to the recessive level during a TXD dominant timeout.

GUID-8D2509C5-1B22-4788-9B02-7AA9F3AE2C1D-low.gifFigure 9-1 Example Timing Diagram for TXD DTO
Note:

The minimum dominant TXD time allowed by the TXD DTO circuit limits the minimum possible transmitted data rate of the device. The CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst case, where five successive dominant bits are followed immediately by an error frame. This, along with the tTXD_DTO minimum, limits the minimum data rate. Calculate the minimum transmitted data rate by: Minimum Data Rate = 11 / tTXD_DTO.