SLLU326A May   2022  – June 2022 TLIN1431-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Features
    2. 1.2 Description
  4. 2EVM Setup and Features
    1. 2.1  Startup Mode Configurations
      1. 2.1.1 Pin and SPI Modes
      2. 2.1.2 Wake Request (WKRQ) vs. Inhibit Output (INH)
    2. 2.2  Commander and Responder Configurations
    3. 2.3  Local Wake-Up
    4. 2.4  Channel Expansion
    5. 2.5  VBAT Voltage Divider
    6. 2.6  Reset Input
    7. 2.7  Logic-Level LIMP and WAKE Signals
    8. 2.8  High-Voltage Signal Monitoring
    9. 2.9  TXD and RXD
    10. 2.10 VCC Load Testing
    11. 2.11 SPI Interface
  5. 3Jumpers, Headers, Connectors, Test Points, and Switches
  6. 4Bill of Materials
  7. 5Schematic

2.9 TXD and RXD

TXD and RXD are accessible either via TP24/TP25, or via the J8 connector. These can be used to interface with the input/output signals of the LIN bus.

Pads R15 and C9 allow for additional pull-down resistance or capacitance on the TXD line if it is needed for applications such as oscilloscope impedance matching. Pad C11 allows for the addition of capacitance to the RXD line.

Placing a shunt on J17 provides a pull-up to RXD. The TLIN1431-Q1 does not require a pull-up on RXD to operate, though this can be used to evaluate the performance of RXD under these conditions.