SLLSF61C December   2019  – June 2022 TLIN2021-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Thermal Information
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Power Supply Characteristics
    6. 7.6 Electrical Characteristics
    7. 7.7 AC Switching Characteristics
    8. 7.8 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  LIN
        1. 9.3.1.1 LIN Transmitter Characteristics
        2. 9.3.1.2 LIN Receiver Characteristics
          1. 9.3.1.2.1 Termination
      2. 9.3.2  TXD
      3. 9.3.3  RXD
      4. 9.3.4  VSUP
      5. 9.3.5  GND
      6. 9.3.6  EN
      7. 9.3.7  WAKE
      8. 9.3.8  INH
      9. 9.3.9  Local Faults
      10. 9.3.10 TXD Dominant Time-Out (DTO)
      11. 9.3.11 Bus Stuck Dominant System Fault: False Wake-Up Lockout
      12. 9.3.12 Thermal Shutdown
      13. 9.3.13 Under Voltage on VSUP
      14. 9.3.14 Unpowered Device
    4. 9.4 Device Functional Modes
      1. 9.4.1 Normal Mode
      2. 9.4.2 Sleep Mode
      3. 9.4.3 Standby Mode
      4. 9.4.4 Wake-Up Events
        1. 9.4.4.1 Local Wake-Up (LWU) via WAKE Input Terminal
        2. 9.4.4.2 Wake-Up Request (RXD)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedures
        1. 10.2.2.1 Normal Mode Application Note
        2. 10.2.2.2 TXD Dominant State Time-Out Application Note
      3. 10.2.3 Application Curves
    3. 10.3 Power Supply Recommendations
    4.     Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 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
  12. 12Mechanical, Packaging, and Orderable Information

9.1 Overview

The TLIN2021-Q1 is a local interconnect network (LIN) physical layer transceiver, compliant to LIN 2.0, LIN 2.1, LIN 2.2, LIN 2.2A, SAE J2602-1, SAE J2602-2, ISO 17987–4, and ISO 17987–7 standards. LIN is a low-speed universal asynchronous receiver transmitter (UART) communication protocol focused on automotive in-vehicle networking.

The TLIN2021-Q1 transmitter supports data rates from 2.4 kbps to 20 kbps and the receiver supports data rates up to 100 kbps for end-of-line programming. The TLIN2021-Q1 controls the state of the LIN bus via the TXD pin and reports the state of the bus via its open-drain RXD output pin. The LIN protocol data stream on the TXD input is converted by the TLIN2021-Q1 into a LIN bus signal using an optimized electromagnetic emissions current-limited wave-shaping driver as outlined by the LIN physical layer specification. The receiver converts the data stream to logic-level signals that are sent to the microcontroller through the open-drain RXD pin. The LIN bus has two states: dominant state (voltage near ground) and recessive state (voltage near battery). In the recessive state, the LIN bus is pulled high by the transceivers internal pull-up resistor (45 kΩ) and a series diode. No external pull-up components are required for responder applications. Commander applications require an external pull-up resistor (1 kΩ) plus a series diode per the LIN specification.

The TLIN2021-Q1 is designed to support 24 V applications with a wide input voltage operating range and also supports low-power sleep mode. The device supports wake-up from low-power mode via wake over LIN, the WAKE pin, or the EN pin. The device allows for system-level reductions in battery current consumption by selectively enabling the various power supplies that may be present on a node through the TLIN2021-Q1 INH output pin.

The TLIN2021-Q1 integrates ESD protection and fault protection which allow for a reduction in the required external components in the applications. The device prevents back-feed current through LIN to the supply input in case of a ground shift or supply voltage disconnection.

The TLIN2021-Q1 also include undervoltage detection, temperature shutdown protection, and loss-of-ground protection. In the event of a fault condition, the transmitter is immediately switched off and remains off until the fault condition is removed.