SPRUJE8C December   2024  – June 2025 AM2752-Q1 , AM2754-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Preface Read This First
      1. 1.2.1 Important Usage Notes
    3. 1.3 Kit Contents
    4. 1.4 Device Information
      1. 1.4.1 Security
    5. 1.5 Audio Expansion Connectors
  6. 2Hardware
    1. 2.1  Component Identification
    2. 2.2  Power Requirements
      1. 2.2.1 Power Input Using USB Type-C Connector
      2. 2.2.2 Power Status LEDs
      3. 2.2.3 Power Tree
      4. 2.2.4 Power Sequence
      5. 2.2.5 PMIC
    3. 2.3  Reset
    4. 2.4  Clock
    5. 2.5  Boot Mode Selection
    6. 2.6  Header Information
    7. 2.7  Push Buttons
    8. 2.8  Switches
    9. 2.9  GPIO Mapping
    10. 2.10 Interfaces
      1. 2.10.1  Memory Interface
        1. 2.10.1.1 OSPI Interface
        2. 2.10.1.2 Board ID EEPROM
        3. 2.10.1.3 MMC0 Interface
        4. 2.10.1.4 HYPERRAM
      2. 2.10.2  Ethernet Interface
        1. 2.10.2.1 Ethernet Add-on Connectors
      3. 2.10.3  Audio Interfaces
        1. 2.10.3.1 Audio Clocking
        2. 2.10.3.2 McASP
        3. 2.10.3.3 MLB
      4. 2.10.4  I2C Interface
      5. 2.10.5  SPI
      6. 2.10.6  UART
      7. 2.10.7  MCAN
      8. 2.10.8  JTAG
      9. 2.10.9  USB
      10. 2.10.10 ADC
    11. 2.11 AEC Mapping
      1. 2.11.1 Audio Expansion Connector 1
      2. 2.11.2 Audio Expansion Connector 2
    12. 2.12 Test Points
  7. 3Hardware Design Files
  8. 4Additional Information
    1. 4.1 If You need Assistance
    2. 4.2 Trademarks
    3. 4.3 Rev. E2 Design Changes
  9. 5References
    1. 5.1 Reference Documents
    2. 5.2 Other TI Components Used This Design
  10. 6Revision History

2.10.6 UART

The AM275x EVM features four UART Ports:

  • WKUP_UART0
  • UART2
  • UART3
  • UART0

The WKUP_UART0, UART2, and UART3 ports are routed from the AM275x SoC to a FDTI Bridge (FT4232HL) for USB to UART conversion. The FDTI Bridge routes to a Micro-B USB Connector (J22).

The UART0 port is routed from the AM275x SoC to the XDS110 debugger (TM4C1294). The XDS110 Debugger routes to another Micro-B USB Connector (J17).

When the AM275x EVM is connected to a host via a USB cable on either of these Micro-B USB connectors, the host can establish a Virtual COM Port, allowing communication through any terminal emulation application.

Both the FT4232HL and TM4C1294 devices are bus powered. Because both devices are powered through the USB BUS, the connection to the COM port is not lost when the AM275x EVM power is removed.

Table 2-19 UART Mapping Table
UART Port USB to UART Bridge USB Connector COM Port (1)
UART0 TM4C1294 J17 XDS110 User UART
UART2 FT4232HL J22 FT4232 Serial Bus A
UART3 FT4232 Serial Bus B
WKUP_UART0 FT4232 Serial Bus C
(1) FT4232 Serial Bus D is left NC

The FT4232 Bridge is configured to operate in ‘Single chip USB to four channel UART’ mode using the configuration file from an external SPI EEPROM (93LC46B) connected to it. The EEPROM supports a 1 Mbit/s clock rate. The EEPROM is programmable in-circuit over USB using a utility program called FT_PROG available from FTDI's web site. FT_PROG is also used for programming the board's serial number for users to identify the connected COM port with board serial number when one or more boards are connected to the computer.

Instead of the FTDI Bridge, UART2 and UART3 ports can be routed from the AM275x SoC to AEC1 and AEC2, respectively, by selection MUXes (TMUX1136DQAR), through the UART2_FET_SEL and UART3_FET_SEL signals.

Table 2-20 UART2 Select Truth Table
UART2_FET_SEL UART2_TXD_FET UART2_RXD_FET
0 (DEFAULT) FT4232_UART2_TXD_1V8 FT4232_UART2_RXD_1V8
1 UART2_TXD UART2_RXD
Table 2-21 UART3 Select Truth Table
UART3_FET_SEL UART3_TXD_FET UART3_RXD_FET
0 (DEFAULT) FT4232_UART3_TXD_1V8 FT4232_UART3_RXD_1V8
1 UART3_TXD UART3_RXD
AM2754, AM2754-Q1, AM2752, AM2752-Q1 UART Interface Block Diagram Figure 2-34 UART Interface Block Diagram