SLLSES7D March   2016  – October 2021 TCAN1042H , TCAN1042HG , TCAN1042HGV , TCAN1042HV

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 and Implementation
    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

Package Options

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

9.4.3.1 Remote Wake Request via Wake Up Pattern (WUP) in Standby Mode

The TCAN1042 family offers a remote wake request feature that is used to indicate to the host microcontroller that the bus is active and the node should return to normal operation.

These devices use the multiple filtered dominant wake up pattern (WUP) from the ISO11898-2 (2016) to qualify bus activity. Once a valid WUP has been received the wake request will be indicated to the microcontroller by a falling edge and low corresponding to a "filtered" dominant on the RXD output terminal.

The WUP consists of a filtered dominant pulse, followed by a filtered recessive pulse, and finally by a second filtered dominant pulse. These filtered dominant, recessive, dominant pulses do not need to occur in immediate succession. There is no timeout that will occur between filtered bits of the WUP. Once a full WUP has been detected the device will continue to drive the RXD output low every time an additional filtered dominant signal is received from the bus.

For a dominant or recessive signal to be considered "filtered", the bus must continually remain in that state for more than tWK_FILTER. Due to variability in the tWK_FILTER, the following three scenarios can exist:

  1. Bus signals that last less than tWK_FILTER(MIN) will never be detected as part of a valid WUP
  2. Bus signals that last more than tWK_FILTER(MIN) but less than tWK_FILTER(MAX) may be detected as part of a valid WUP
  3. Bus signals that last more than tWK_FILTER(MAX) will always be detected as part of a valid WUP

Once the first filtered dominant signal is received, the device is now waiting on a filtered recessive signal, other bus traffic will not reset the bus monitor. Once the filtered recessive signal is received, the monitor is now waiting on a second filtered dominant signal, and again other bus traffic will not reset the monitor. After reception of the full WUP, the device will transition to driving the RXD output pin low for the remainder of any dominant signal that remains on the bus for longer than tWK_FILTER.

GUID-8B009358-BB6A-4829-A7C7-6D2C6F3818B3-low.gif Figure 9-4 Wake Up Pattern (WUP)