SPRUJF1 November   2024 AM2612

ADVANCE INFORMATION  

  1.   1
  2.   Description
  3.   Key Features
  4. 1LaunchPad Module Overview
    1. 2.1 Introduction
    2. 2.2 Preface: Read This First
      1. 2.2.1 If You Need Assistance
      2. 2.2.2 Important Usage Notes
    3. 2.3 Kit Contents
    4. 2.4 Device Information
      1. 2.4.1 System Architecture Overview
      2. 2.4.2 Security
      3. 2.4.3 Compliance
      4. 2.4.4 BoosterPacks
      5. 2.4.5 Component Identification
  5. 2Hardware Description
    1. 3.1  Board Setup
      1. 3.1.1 Power Requirements
        1. 3.1.1.1 Power Input Using USB Type-C Connector
        2. 3.1.1.2 Power Status LEDs
        3. 3.1.1.3 Power Tree
      2. 3.1.2 Push Buttons
      3. 3.1.3 Boot mode Selection
      4. 3.1.4 IO Expander
    2. 3.2  Functional Block Diagram
    3. 3.3  GPIO Mapping
    4. 3.4  Reset
    5. 3.5  Clock
    6. 3.6  Memory Interfaces
      1. 3.6.1 OSPI
      2. 3.6.2 Board ID EEPROM
    7. 3.7  Ethernet Interface
      1. 3.7.1 Ethernet PHY Add-on Board connector #0 - CPSW RGMII/ICSSM
      2. 3.7.2 Ethernet PHY Add-on Board connector #1 - CPSW RGMII/ICSSM
    8. 3.8  I2C
    9. 3.9  Industrial Application LEDs
    10. 3.10 SPI
    11. 3.11 UART
    12. 3.12 MCAN
    13. 3.13 FSI
    14. 3.14 JTAG
    15. 3.15 TIVA and Test Automation Pin Mapping
    16. 3.16 LIN
    17. 3.17 ADC and DAC
    18. 3.18 EQEP and SDFM
    19. 3.19 EPWM
    20. 3.20 USB
    21. 3.21 BoosterPack Headers
  6. 3Known Issues and modifications done on LP-AM261 RevE1
    1. 4.1 TA_POWERDOWNz pulled up by VSYS_TA_3V3 which is powered by VSYS_3V3
    2. 4.2 USB2.0_MUX_SEL0 pulled up by R355
    3. 4.3 MDIO and MDC of PRU0-ICSS0 needs to be routed to both Ethernet PHYs
    4. 4.4 AM261_RGMII1_RXLINK and AM261_RGMII2_RXLINK to be connected to GPIO
  7. 4Additional Information
    1.     Trademarks
    2. 5.1 Sitara MCU+ Academy
  8. 5References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design
    3. 6.3 Related Documentation From Texas Instruments
  9. 6Revision History

2.1.4 IO Expander

AM261x LaunchPad has two TCA6408ARGTR IO Expanders that provide general-purpose I/O expansion and bidirectional voltage translation for processors through I2C communication, an interface consisting of serial clock (SCL), and serial data (SDA) signals.

The TCA6408A consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high) Register. At power on, the I/Os are configured as inputs. However, the system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input or Output Register. The polarity of the Input Port Register can be inverted with the Polarity Inversion Register. All registers can be read by the system controller. In AM261 SoC, the communication with the IO Expander is done through the I2C0 bus. The signals that are coming out of the IO Expander shown in Figure 2-7. Please refer to TCA6408ARGTR-Datasheet for programming guide of TCA6408ARGTR.

AM261x IO Expander Figure 2-7 IO Expander