SLLSES7C March   2016  – May 2017 TCAN1042H , TCAN1042HG , TCAN1042HGV , TCAN1042HV


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configurations and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Power Rating
    6. 7.6 Electrical Characteristics
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. Parameter Measurement Information
  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. 5-V VCC Only Devices (Devices without the "V" Suffix):
        2. 5 V VCC with VIO I/O Level Shifting (Devices with the "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. Remote Wake Request via Wake Up Pattern (WUP) in Standby Mode
      4. 9.4.4 Driver and Receiver Function Tables
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Design Requirements
        1. Bus Loading, Length and Number of Nodes
      2. 10.2.2 Detailed Design Procedures
        1. CAN Termination
      3. 10.2.3 Application Curves
  11. 11Power Supply Requirements
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Links
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Application and Implementation


Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

Application Information

These CAN transceivers are typically used in applications with a host microprocessor or FPGA that includes the data link layer portion of the CAN protocol. Below are typical application configurations for both 5 V and 3.3 V microprocessor applications. The bus termination is shown for illustrative purposes.

Typical Applications

TCAN1042 TCAN1042G TCAN1042GV TCAN1042H TCAN1042HG TCAN1042HGV TCAN1042HV TCAN1042V CAN_Bus_sllses7.gif Figure 16. Typical CAN Bus Application

Design Requirements

Bus Loading, Length and Number of Nodes

The ISO 11898-2 Standard specifies a maximum bus length of 40 m and maximum stub length of 0.3 m. However, with careful design, users can have longer cables, longer stub lengths, and many more nodes to a bus. A large number of nodes requires transceivers with high input impedance such as the TCAN1042 family of transceivers.

Many CAN organizations and standards have scaled the use of CAN for applications outside the original ISO 11898-2. They have made system-level trade-offs for data rate, cable length, and parasitic loading of the bus. Examples of some of these specifications are ARINC825, CANopen, DeviceNet and NMEA2000.

The TCAN1042 family is specified to meet the 1.5 V requirement with a 50Ω load, incorporating the worst case including parallel transceivers. The differential input resistance of the TCAN1042 family is a minimum of 30 kΩ. If 100 TCAN1042 family transceivers are in parallel on a bus, this is equivalent to a 300Ω differential load worst case. That transceiver load of 300 Ω in parallel with the 60Ω gives an equivalent loading of 50 Ω. Therefore, the TCAN1042 family theoretically supports up to 100 transceivers on a single bus segment. However, for CAN network design margin must be given for signal loss across the system and cabling, parasitic loadings, network imbalances, ground offsets and signal integrity thus a practical maximum number of nodes is typically much lower. Bus length may also be extended beyond the original ISO 11898 standard of 40 m by careful system design and datarate tradeoffs. For example CANopen network design guidelines allow the network to be up to 1 km with changes in the termination resistance, cabling, less than 64 nodes and significantly lowered data rate.

This flexibility in CAN network design is one of the key strengths of the various extensions and additional standards that have been built on the original ISO 11898-2 CAN standard. In using this flexibility comes the responsibility of good network design and balancing these tradeoffs.

Detailed Design Procedures

CAN Termination

The ISO 11898 standard specifies the interconnect to be a 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 two terminations always exist on the network.

Termination may be a single 120-Ω resistor at the end of the bus, either on the cable or in a terminating node. If filtering and stabilization of the common mode voltage of the bus is desired, then split termination may be used. (See Figure 17). 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.

TCAN1042 TCAN1042G TCAN1042GV TCAN1042H TCAN1042HG TCAN1042HGV TCAN1042HV TCAN1042V Termination_Options_sllses8.gif Figure 17. CAN Bus Termination Concepts

The family of transceivers have variants for both 5-V only applications and applications where level shifting is needed for a 3.3-V micrcontroller.

TCAN1042 TCAN1042G TCAN1042GV TCAN1042H TCAN1042HG TCAN1042HGV TCAN1042HV TCAN1042V Typical_CAN_5V_connect_sllse8_1042.png Figure 18. Typical CAN Bus Application Using 5V CAN Controller
TCAN1042 TCAN1042G TCAN1042GV TCAN1042H TCAN1042HG TCAN1042HGV TCAN1042HV TCAN1042V Typical_CAN_33V_connect_sllse8_1042.png Figure 19. Typical CAN Bus Application Using 3.3 V CAN Controller

Application Curves

VCC = 4.5 V to 5.5 V VIO = 3.3 V RL = 60 Ω
CL = Open Temp = 25°C STB = 0 V
Figure 20. ICC Dominant Current over VCC Supply Voltage