SLLSFO8C May   2024  – November 2025 TCAN2450-Q1 , TCAN2451-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  IEC ESD Ratings
    4. 6.4  Recommended Operating Conditions
    5. 6.5  Thermal Information
    6. 6.6  Supply Characteristics
    7. 6.7  Electrical Characteristics
    8. 6.8  Timing Requirements
    9. 6.9  Switching Characteristics
    10. 6.10 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  CAN FD Transceiver
        1. 8.3.1.1 Driver and Receiver Function
      2. 8.3.2  VCC1 Regulator
        1. 8.3.2.1 Functional Description of Buck Regulator
          1. 8.3.2.1.1 Fixed Frequency Peak Current Mode Control
          2. 8.3.2.1.2 Minimum ON-Time, Minimum OFF-Time, and Frequency Foldback
          3. 8.3.2.1.3 Overcurrent and Short Circuit Protection
          4. 8.3.2.1.4 Soft Start
        2. 8.3.2.2 Buck Regulator Functional Modes
          1. 8.3.2.2.1 Buck Shutdown Mode
          2. 8.3.2.2.2 Buck Active Modes
      3. 8.3.3  VCC2 Regulator
        1. 8.3.3.1 VCC2 Short to Battery Protection
      4. 8.3.4  Reset Function (nRST Pin)
      5. 8.3.5  LIMP Function
      6. 8.3.6  High Side Switches
      7. 8.3.7  WAKE and ID Inputs
        1. 8.3.7.1 ID Functionality
      8. 8.3.8  Interrupt Function (nINT Pin)
      9. 8.3.9  SPI Communication
        1. 8.3.9.1 Cyclic Redundancy Check
        2. 8.3.9.2 Chip Select Not (nCS):
        3. 8.3.9.3 SPI Clock Input (SCK):
        4. 8.3.9.4 SPI Data Input (SDI):
        5. 8.3.9.5 SPI Data Output (SDO):
      10. 8.3.10 SW Pin
      11. 8.3.11 GFO Pin
      12. 8.3.12 Wake Functions
        1. 8.3.12.1 CAN Bus Wake Using RXD Request (BWRR) in Sleep Mode
        2. 8.3.12.2 Local Wake Up (LWU) via WAKEx Input Terminal
          1. 8.3.12.2.1 Static Wake
          2. 8.3.12.2.2 Cyclic Sensing Wake
        3. 8.3.12.3 Cyclic Wake
        4. 8.3.12.4 Selective Wake-up
          1. 8.3.12.4.1 Selective Wake Mode (TCAN2451-Q1)
          2. 8.3.12.4.2 Frame Detection
          3. 8.3.12.4.3 Wake-Up Frame (WUF) Validation
          4. 8.3.12.4.4 WUF ID Validation
          5. 8.3.12.4.5 WUF DLC Validation
          6. 8.3.12.4.6 WUF Data Validation
          7. 8.3.12.4.7 Frame Error Counter
          8. 8.3.12.4.8 CAN FD Frame Tolerance
          9. 8.3.12.4.9 8Mbps Filtering
      13. 8.3.13 Protection Features
        1. 8.3.13.1 Fail-safe Features
          1. 8.3.13.1.1 Sleep Mode Through Sleep Wake Error
        2. 8.3.13.2 Device Reset
        3. 8.3.13.3 Floating Terminals
        4. 8.3.13.4 TXD Dominant Time Out (DTO)
        5. 8.3.13.5 CAN Bus Short Circuit Current Limiting
        6. 8.3.13.6 Thermal Shutdown
        7. 8.3.13.7 Under and Over Voltage Lockout and Unpowered Device
          1. 8.3.13.7.1 Under-Voltage
            1. 8.3.13.7.1.1 VSUP and VHSS Under-voltage
            2. 8.3.13.7.1.2 VCC1 Under-Voltage
            3. 8.3.13.7.1.3 VCC2 Under-voltage
            4. 8.3.13.7.1.4 VCAN Under-voltage
          2. 8.3.13.7.2 VCC1 and VCC2 Over-voltage
          3. 8.3.13.7.3 VCC1 and VCC2 Short Circuit
        8. 8.3.13.8 Watchdog
          1. 8.3.13.8.1 Watchdog Error Counter and Action
          2. 8.3.13.8.2 Watchdog SPI Programming
            1. 8.3.13.8.2.1 Watchdog Configuration Lock Mechanism
              1. 8.3.13.8.2.1.1 Watchdog Configuration in SPI Two-byte Mode
          3. 8.3.13.8.3 Watchdog Timing
          4. 8.3.13.8.4 Question and Answer Watchdog
            1. 8.3.13.8.4.1 WD Question and Answer Basic Information
            2. 8.3.13.8.4.2 Question and Answer Register and Settings
            3. 8.3.13.8.4.3 WD Question and Answer Value Generation
              1. 8.3.13.8.4.3.1 Answer Comparison
              2. 8.3.13.8.4.3.2 Sequence of the 2-bit Watchdog Answer Counter
              3. 8.3.13.8.4.3.3 Question and Answer WD Example
                1. 8.3.13.8.4.3.3.1 Example Configuration for Desired Behavior
                2. 8.3.13.8.4.3.3.2 Example of performing a question and answer sequence
        9. 8.3.13.9 Bus Fault Detection and Communication
      14. 8.3.14 Customer EEPROM Programming
    4. 8.4 Device Functional Modes
      1. 8.4.1 Init Mode
      2. 8.4.2 Normal Mode
      3. 8.4.3 Standby Mode
      4. 8.4.4 Restart Mode
      5. 8.4.5 Fail-safe Mode
        1. 8.4.5.1 SBC Faults
        2. 8.4.5.2 CAN Transceiver Faults
      6. 8.4.6 Sleep Mode
  10. 9 Device Register Tables
    1. 9.1 Device Registers
  11. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 CAN BUS Loading, Length and Number of Nodes
      2. 10.1.2 CAN Termination
        1. 10.1.2.1 CAN Bus Biasing
      3. 10.1.3 Device Brownout Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedures
        1. 10.2.2.1 CAN Detailed Design Procedure
      3. 10.2.3 Application Curves
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 CAN Transceiver Physical Layer Standards:
      2. 11.1.2 EMC Requirements:
      3. 11.1.3 Conformance Test Requirements:
      4. 11.1.4 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
8.3.13.7.3 VCC1 and VCC2 Short Circuit
The TCAN245x-Q1monitors VCC1 and VCC2 (CAN LDO) for short to ground conditions. Short to ground is represented by VCC133SC, VCC15SC and VCC2SC. A short to ground turns off the integrated regulators. On VCC1 supply, a short is detected when the VCC1 voltage is below the set UVCC1 threshold for a period longer than tVSC-VCC1. On VCC2 supply, a short is detected when the VCC2 voltage is below the set UVCC2 threshold for a period longer than tVSC-VCC2

.

When a VCC1SC occurs, VCC1 is turned off for a minimum of tREGOFF, and the device enters fail-safe mode (if enabled) or sleep mode. During this time, wake events are monitored and preserved. A short circuit event cannot be monitored while the LDO is off. A wake event causes VCC1 to be turned on for tREGON to see if the SC event is still present. If still present, the device transitions to sleep mode. If not present, the device transitioned to restart mode. While in fail-safe mode, the SWE timer starts and if the fault is not cleared and a wake event has not taken place before the timer times out the device transitions to sleep mode. If fail-safe mode is disabled, the device transitions to sleep mode. See Figure 8-36 and Figure 8-37 for device behavior during a short to ground event.
TCAN2450-Q1 TCAN2451-Q1 VCC1SC State Diagram
Note: When VCC1_CFG = 01b for VCC1 always on, a wake event is not needed to exit the fail-safe mode. The device exits the fail-safe mode after tREGOFF timer expires.
Figure 8-36 VCC1SC State Diagram
TCAN2450-Q1 TCAN2451-Q1 VCC2SC State DiagramFigure 8-37 VCC2SC State Diagram