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

7.4 Device Functional Modes

The TCAN843-Q1 has six operating modes: normal, standby, silent, go-to-sleep, sleep, and off mode. Operating mode selection is controlled using the nSTB pin and EN pin in conjunction with supply conditions, temperature conditions, and wake events.

TCAN843-Q1 TCAN843-Q1 State Machine
  1. The enable pin can be in a logical high or low state while in sleep mode but since the pin has an internal pull-down, the lowest possible power consumption occurs when the pin is left either floating or pulled low externally.
  2. First set EN = low at least 0.5μs before setting nSTB = high to produce a transition directly from Sleep mode to Silent mode without first passing through Normal mode (and thus inadvertently clearing fault flags).
Figure 7-4 TCAN843-Q1 State Machine
Table 7-3 TCAN843-Q1 Mode Overview
MODEVCC and VIOVSUPENnSTBWAKERQ FLAGDRIVERRECEIVERRXDINH
Normal> UVCC and > UVIO> UVSUPHighHighXEnabledEnabledMirrors bus stateOn
Silent> UVCC and > UVIO> UVSUPLowHighXDisabledEnabledMirrors bus stateOn
Standby> UVCC and > UVIO> UVSUPHighLowSetDisabledLow power bus monitor enabledLow signals wake-upOn
> UVCC and > UVIO> UVSUPLowLowXDisabledLow power bus monitor enabledLow signals wake-upOn
> UVCC and < UVIO> UVSUPLowLowXDisabledLow power bus monitor enabledHigh impedanceOn
Go-to-sleep(1)> UVCC and > UVIO> UVSUPHighLowClearedDisabledLow power bus monitor enabledHigh or high impedance (no VIO)On(2)
Sleep(3)> UVCC and > UVIO> UVSUPHighLowClearedDisabledLow power bus monitor enabledHigh or high impedance (no VIO)High

Impedance

< UVCC or < UVIO> UVSUPXXXDisabledLow power bus monitor enabledHigh or high impedance (no VIO)High impedance

Passive(4)

< UVCC and > UVIO

> UVSUP

X

High

X

Disabled

Disabled

High

On

ProtectedX< UVSUPXXXDisabledDisabledHigh impedanceHigh impedance
(1) Go-to-sleep: Transitional mode for EN = H, nSTB = L until tGOTOSLEEP timer has expired. The low-power bus monitor becomes/remains enabled in this state.
(2) The INH pin transitions to high impedance once the tGOTOSLEEP timer has expired and the device transitions to Sleep mode.
(3) Mode change from Go-to-Sleep mode to Sleep mode once tGOTOSLEEP timer has expired.
(4) Passive mode is entered from Normal mode or Silent mode when a UVCC event occurs for t > tUV_det. The device transitions from Passive mode to Sleep mode once the tUV timer has expired.