SPRUJ09D March   2022  – September 2023 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1 , AM263P4 , AM263P4-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Preface: Read This First
    1. 2.1 Sitara MCU+ Academy
    2. 2.2 If You Need Assistance
    3. 2.3 Important Usage Notes
  5. 2Control Card Overview
    1. 3.1 Kit Contents
    2. 3.2 Key Features
    3. 3.3 Component Identification
    4. 3.4 HSEC 180-pin Control Card Docking Station
    5. 3.5 Compliance
  6. 3Board Setup
    1. 4.1 Power Requirements
      1. 4.1.1 Power Input Using USB Type-C Connector
      2. 4.1.2 Power Status LEDs
      3. 4.1.3 Power Tree
      4. 4.1.4 Power Sequence
    2. 4.2 Push Buttons
    3. 4.3 Boot Mode Selection
    4. 4.4 JTAG Path Selection
  7. 4Hardware Description
    1. 5.1  Functional Block Diagram
    2. 5.2  GPIO Mapping
    3. 5.3  Reset
    4. 5.4  Clock
    5. 5.5  Memory Interface
      1. 5.5.1 QSPI
      2. 5.5.2 Board ID EEPROM
    6. 5.6  Ethernet Interface
      1. 5.6.1 RGMII
      2. 5.6.2 PRU-ICSS
      3. 5.6.3 LED Indication in RJ45 Connector
    7. 5.7  I2C
    8. 5.8  Industrial Application LEDs
    9. 5.9  SPI
    10. 5.10 UART
    11. 5.11 MCAN
    12. 5.12 FSI
    13. 5.13 JTAG
    14. 5.14 Test Automation Header
    15. 5.15 LIN
    16. 5.16 MMC
    17. 5.17 ADC and DAC
    18. 5.18 HSEC Pinout and Pinmux Mapping
  8. 5References
    1. 6.1 References
    2. 6.2 Other TI Components Used in This Design
  9.   Revision History
  10.   A E2 Design Changes
  11.   B E1 HSEC Pinout Table

4.15 LIN

The AM263x Control Card supports Local Interconnect Network communication through the use of a LIN transceiver (TLIN2029-Q1) that outputs the LIN Bus to the second pin of a 3 pin header.

GUID-20220426-SS0I-GGHR-8B31-PX6G0MPVWV8W-low.png Figure 4-24 LIN PHY

The LIN transmit and receive signals are internally muxed on the AM263x with the UART1 transmit and receive signals. Because of the internal muxing, there is an external 1:2 mux (SN74CB3Q3257PWR) which has a select line that is driven by the GPIO Expander.

Table 4-15 LIN MUX Select Logic
Select Logic Condition Function
LOW LIN Selected A→B1
HIGH HSEC UART Selected A→B2

The AM263x SoC does not have an integrated pull up for the LIN RX signal, therefore, an external pull up resistor is needed to the processor I/O supply voltage is required.

The AM263x Control Card includes a double pole single throw switch (SW10) to control the voltage supply for the LIN Transceiver.

Table 4-16 LIN Switch Logic
LIN Voltage Switch Position Voltage Supply Selected
Pin 1-2 VMAIN, 5 V supply output from either the USB-C connection or HSEC power connection.
Pin 2-3 VBAT_LIN, external voltage supply from pin 1 of 2 pin header

There is also a single pole throw switch (SW9) that drives the LIN Node application.

Table 4-17 LIN Node Application Switch
LIN Node Application Switch Position LIN Node Application
Pin 1 Device node application
Pin 2 Controller node application

The Control Card pulls up the enable pin of the LIN transceiver for the transceiver to be in normal operational mode when the I/O Voltage supply is brought up.