SLLSFD1E January   2021  – March 2023 TCAN1043A-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  ESD Ratings - IEC Specifications
    4. 6.4  Recommended Operating Conditions
    5. 6.5  Thermal Information
    6. 6.6  Power Dissipation Ratings
    7. 6.7  Power Supply Characteristics
    8. 6.8  Electrical Characteristics
    9. 6.9  Timing Requirements
    10. 6.10 Switching Characteristics
    11. 6.11 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Supply Pins
        1. 8.3.1.1 VSUP Pin
        2. 8.3.1.2 VCC Pin
        3. 8.3.1.3 VIO Pin
      2. 8.3.2 Digital Inputs and Outputs
        1. 8.3.2.1 TXD Pin
        2. 8.3.2.2 RXD Pin
        3. 8.3.2.3 nFAULT Pin
        4. 8.3.2.4 EN Pin
        5. 8.3.2.5 nSTB Pin
      3. 8.3.3 GND
      4. 8.3.4 INH Pin
      5. 8.3.5 WAKE Pin
      6. 8.3.6 CAN Bus Pins
      7. 8.3.7 Faults
        1. 8.3.7.1 Internal and External Fault Indicators
          1. 8.3.7.1.1 Power-Up (PWRON Flag)
          2. 8.3.7.1.2 Wake-Up Request (WAKERQ Flag)
          3. 8.3.7.1.3 Undervoltage Faults
            1. 8.3.7.1.3.1 Undervoltage on VSUP
            2. 8.3.7.1.3.2 Undervoltage on VCC
            3. 8.3.7.1.3.3 Undervoltage on VIO
          4. 8.3.7.1.4 CAN Bus Fault (CBF Flag)
          5. 8.3.7.1.5 TXD Clamped Low (TXDCLP Flag)
          6. 8.3.7.1.6 TXD Dominant State Timeout (TXDDTO Flag)
          7. 8.3.7.1.7 TXD Shorted to RXD Fault (TXDRXD Flag)
          8. 8.3.7.1.8 CAN Bus Dominant Fault (CANDOM Flag)
      8. 8.3.8 Local Faults
        1. 8.3.8.1 TXD Clamped Low (TXDCLP)
        2. 8.3.8.2 TXD Dominant Timeout (TXD DTO)
        3. 8.3.8.3 Thermal Shutdown (TSD)
        4. 8.3.8.4 Undervoltage Lockout (UVLO)
        5. 8.3.8.5 Unpowered Devices
        6. 8.3.8.6 Floating Terminals
        7. 8.3.8.7 CAN Bus Short-Circuit Current Limiting
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Mode Description
        1. 8.4.1.1 Normal Mode
        2. 8.4.1.2 Silent Mode
        3. 8.4.1.3 Standby Mode
        4. 8.4.1.4 Go-To-Sleep Mode
        5. 8.4.1.5 Sleep Mode
          1. 8.4.1.5.1 Remote Wake Request via Wake-Up Pattern (WUP)
          2. 8.4.1.5.2 Local Wake-Up (LWU) via WAKE Input Terminal
      2. 8.4.2 CAN Transceiver
        1. 8.4.2.1 CAN Transceiver Operation
          1. 8.4.2.1.1 CAN Transceiver Modes
            1. 8.4.2.1.1.1 CAN Off Mode
            2. 8.4.2.1.1.2 CAN Autonomous: Inactive and Active
            3. 8.4.2.1.1.3 CAN Active
          2. 8.4.2.1.2 Driver and Receiver Function Tables
          3. 8.4.2.1.3 CAN Bus States
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
      1. 9.1.1 Typical Application
      2. 9.1.2 Design Requirements
        1. 9.1.2.1 Bus Loading, Length and Number of Nodes
      3. 9.1.3 Detailed Design Procedure
        1. 9.1.3.1 CAN Termination
    2. 9.2 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
8.4.1.5.1 Remote Wake Request via Wake-Up Pattern (WUP)

The TCAN1043A-Q1 implements a low-power wake receiver in the standby and sleep mode that uses the multiple filtered dominant wake-up pattern (WUP) defined in the ISO11898-2:2016 standard.

The wake-up pattern (WUP) consists of a filtered dominant bus, then a filtered recessive bus time followed by a second filtered dominant bus time. The first filtered dominant initiates the WUP and the bus monitor is now waiting on a filtered recessive; other bus traffic will not reset the bus monitor. Once a filtered recessive is received the bus monitor is now waiting on a filtered dominant, and again, other bus traffic will not reset the bus monitor. Immediately upon receiving of the second filtered dominant the bus monitor will recognize the WUP and drive the RXD terminal low, if a valid VIO is present signaling to the controller the wake-up request. If a valid VIO is not present when the wake-up pattern is received the transceiver drives the RXD output pin low once VIO > UVIOR.

The WUP consists of:

  • A filtered dominant bus of at least tWK(FILTER) followed by
  • A filtered recessive bus time of at least tWK(FILTER) followed by
  • A second filtered dominant bus time of at least tWK(FILTER)

For a dominant or recessive to be considered “filtered,” the bus must be in that state for more than tWK(FILTER) time. Due to variability in the tWK(FILTER) the following scenarios are applicable. Bus state times less than the tWK(FILTER) minimum will never be detected as part of a WUP and thus no wake request will be generated. Bus state times between tWK(FILTER) minimum and tWK(FILTER) maximum may be detected as part of a WUP and a wake request may be generated. Bus state times more than tWK(FILTER) maximum will always be detected as part of a WUP and thus a wake request will always be generated. See Figure 8-6 for the timing diagram of the WUP.

The pattern and tWK(FILTER) time used for the WUP and wake request prevents noise and bus stuck dominant faults from causing false wake requests while allowing any CAN or CAN FD message to initiate a wake request.

ISO11898-2:2016 has two sets of times for a short and long wake-up filter times. The tWK(FILTER) timing for the TCAN1043A-Q1 has been picked to be within the min and max values of both filter ranges. This timing has been chosen such that a single bit time at 500 kbps, or two back to back bit times at 1 Mbps will trigger the filter in either bus state.

For an additional layer of robustness and to prevent false wake-ups, the transceiver implements the tWK(TIMEOUT) timer. For a remote wake-up event to successfully occur, the entire wake-up pattern must be received within the timeout value. If the full wake-up pattern is not received before the tWK(TIMEOUT) expires then the internal logic is reset and the transceiver remains in sleep mode without waking up. The full pattern must then be transmitted again within the tWK(TIMEOUT) window. See Figure 8-6.

A recessive bus of at least tWK(FILTER) must separate the next WUP pattern if the CAN bus is dominant when the tWK(TIMEOUT) expires.

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*The RXD pin is only driven once VIO is present.
Figure 8-6 Wake-Up Pattern (WUP)