SLLSFY0A September   2025  – December 2025 TCAN843-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  ESD Ratings - IEC Specifications
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Information
    6. 5.6  Power Dissipation Ratings
    7. 5.7  Power Supply Characteristics
    8. 5.8  Electrical Characteristics
    9. 5.9  Timing Requirements
    10. 5.10 Switching Characteristics
    11. 5.11 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Supply Pins
        1. 7.3.1.1 VSUP Pin
        2. 7.3.1.2 VCC Pin
        3. 7.3.1.3 VIO Pin
      2. 7.3.2 Digital Inputs and Outputs
        1. 7.3.2.1 TXD Pin
        2. 7.3.2.2 RXD Pin
        3. 7.3.2.3 nFAULT Pin
        4. 7.3.2.4 EN Pin
        5. 7.3.2.5 nSTB Pin
        6. 7.3.2.6 NC Pin
      3. 7.3.3 GND
      4. 7.3.4 INH Pin
      5. 7.3.5 WAKE Pin
      6. 7.3.6 CAN Bus Pins
      7. 7.3.7 Faults
        1. 7.3.7.1 Internal and External Fault Indicators
          1. 7.3.7.1.1 Power-Up (PWRON Flag)
          2. 7.3.7.1.2 Wake-Up Request (WAKERQ Flag)
          3. 7.3.7.1.3 Undervoltage Faults
            1. 7.3.7.1.3.1 Undervoltage on VSUP
            2. 7.3.7.1.3.2 Undervoltage on VCC
            3. 7.3.7.1.3.3 Undervoltage on VIO
          4. 7.3.7.1.4 TXD Dominant State Timeout (TXDDTO Flag)
          5. 7.3.7.1.5 TXD Shorted to RXD Fault (TXDRXD Flag)
          6. 7.3.7.1.6 CAN Bus Dominant Fault (CANDOM Flag)
      8. 7.3.8 Local Faults
        1. 7.3.8.1 TXD Dominant Timeout (TXD DTO)
        2. 7.3.8.2 Thermal Shutdown (TSD)
        3. 7.3.8.3 Undervoltage Lockout (UVLO)
        4. 7.3.8.4 Unpowered Devices
        5. 7.3.8.5 Floating Terminals
        6. 7.3.8.6 CAN Bus Short-Circuit Current Limiting
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Mode Description
        1. 7.4.1.1 Normal Mode
        2. 7.4.1.2 Silent Mode
        3. 7.4.1.3 Standby Mode
        4. 7.4.1.4 Go-To-Sleep Mode
        5. 7.4.1.5 Sleep Mode
          1. 7.4.1.5.1 Remote Wake Request via Wake-Up Pattern (WUP)
          2. 7.4.1.5.2 Local Wake-Up (LWU) by WAKE Input Terminal
      2. 7.4.2 CAN Transceiver
        1. 7.4.2.1 CAN Transceiver Operation
          1. 7.4.2.1.1 Driver and Receiver Function Tables
          2. 7.4.2.1.2 CAN Bus States
  9. 8 Application Information Disclaimer
    1. 8.1 Application Information
      1. 8.1.1 Typical Application
      2. 8.1.2 Design Requirements
        1. 8.1.2.1 Bus Loading, Length and Number of Nodes
      3. 8.1.3 Detailed Design Procedure
        1. 8.1.3.1 CAN Termination
      4. 8.1.4 Application Curves
    2. 8.2 Power Supply Recommendations
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 CAN Transceiver Physical Layer Standards:
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.7.1 Internal and External Fault Indicators

The following device status indicator flags are implemented to allow for the MCU to determine the status of the device and the system. In addition to faults, the nFAULT terminal also signals wake-up requests and a “cold” power-up sequence on the VSUP battery terminal so the system can do any diagnostics or cold booting sequence necessary. The RXD terminal indicates wake-up request and the faults are multiplexed (ORed) to the nFAULT output.

Table 7-1 TCAN843-Q1 Transceiver Status Indicator
EVENTFLAG NAMECAUSEINDICATORS(1)FLAG IS CLEAREDCOMMENT
Power-upPWRONPower up on VSUP and any return of VSUP after the battery supply has been below UVSUPnFAULT = low upon entering silent mode from standby or sleep modeAfter a transition to normal modeA cold start condition generates a local wake-up WAKERQ, WAKESR and a PWRON flag.
Wake-up RequestWAKERQ(2)Wake-up event on CAN bus, state transition on WAKE pin, or initial power upnFAULT = RXD = low after wake-up upon entering standby modeAfter a transition to normal mode
or VCC < UVCC(F)
or VIO < UVIO(F) for t ≥ tUV		Wake-up request can only be set from standby, go-to-sleep, or sleep mode.
Resets expired timers for UVVCC or UVVIO in sleep mode.
Wake-up Source Recognition(3)WAKESRAvailable upon entering normal mode(4)
nFAULT = low indicates a local wake-up event from the WAKE pin
nFAULT = high indicates a remote wake-up event from the CAN bus		After four recessive-to-dominant edges on TXD in normal mode,(5)
leaving normal mode,
or VCC < UVCC(F)
or VIO < UVIO(F) for t ≥ tUV		A cold start condition generates a local wake-up WAKERQ, WAKESR and a PWRON flag.
UndervoltageUVCCVCC < UVCC(F)Not externally indicatedVCC > UVCC(R),
or a wake-up request occurs
UVIOVIO < UVIO(F)Not externally indicatedVIO > UVIO(R),
or a wake-up request occurs
UVSUPVSUP < UVSUP(F)Not externally indicatedVSUP > UVSUP(R)A VSUP undervoltage event generates a cold start condition once VSUP > UVSUP(R).
Local FaultsTXDDTOTXD dominant time out, dominant (low) signal for t ≥ tTXDDTOnFAULT = low upon entering silent mode from normal modeRXD = low and TXD = high for 4µs,
or a mode transition into normal, standby, go-to-sleep, or sleep modes		CAN driver remains disabled until the TXDDTO is cleared. CAN receiver remains active during the TXDDTO fault.
TXDRXDTXD and RXD pins are shorted together for t ≥ tTXDDTOCAN driver remains disabled until the TXDRXD is cleared. CAN receiver remains active during the TXDRXD fault. TXDRXD is detected while TXD = RXD = low.
CANDOMCAN bus dominant fault, when dominant bus signal received for t ≥ tBUSDOMRXD = high,
or a transition into normal, standby, go-to-sleep, or sleep modes		CAN driver remains enabled during CANDOM fault.
TSDThermal shutdown, TJ ≥ TSDRTJ < TSDF and
RXD = low and TXD = high for 4µs,
or transition into normal, standby, go-to-sleep, or sleep modes		CAN driver remains disabled until the TSD event is cleared. CAN receiver remains active during the TSD fault.
(1) VIO and VSUP are present
(2) Transitions to go-to-sleep mode is blocked until WAKERQ flag is cleared
(3) Wake-up source recognition reflects the first wake up source. If additional wake-up events occur the source still indicates the original wake-up source
(4) Indicator is only available in normal mode until the flag is cleared
(5) A minimum of 4µs between recessive-to-dominant edges is required to clear the WAKESR flag