SPRUJ93 august   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1.     Preface: Read This First
      1. 1.1.1 Sitara™ MCU+ Academy
      2. 1.1.2 If You Need Assistance
      3. 1.1.3 Important Usage Notes
    2. 1.1 Introduction
    3. 1.2 Kit Contents
    4. 1.3 Specification
    5. 1.4 Device Information
    6. 1.5 HSEC 180-pin Control Card Docking Station
    7. 1.6 Security
  6. 2Hardware
    1. 2.1  Functional Block Diagram
    2. 2.2  Component Identification
    3. 2.3  Power Requirements
      1. 2.3.1 Power Input Using USB Type-C Connector
      2. 2.3.2 Power Status LEDs
      3. 2.3.3 Power Tree
      4. 2.3.4 Power Sequence
      5. 2.3.5 PMIC
    4. 2.4  Reset
    5. 2.5  Clock
    6. 2.6  Boot Mode Selection
    7. 2.7  JTAG Path Selection
    8. 2.8  Header Information
    9. 2.9  GPIO Mapping
    10. 2.10 Push Buttons
    11. 2.11 Test Points
    12. 2.12 Interfaces
      1. 2.12.1  Memory Interface
        1. 2.12.1.1 QSPI
        2. 2.12.1.2 Board ID EEPROM
      2. 2.12.2  Ethernet Interface
        1. 2.12.2.1 RGMII
        2. 2.12.2.2 PRU-ICSS
        3. 2.12.2.3 LED Indication in RJ45 Connector
      3. 2.12.3  I2C
      4. 2.12.4  Industrial Application LEDs
      5. 2.12.5  SPI
      6. 2.12.6  UART
      7. 2.12.7  MCAN
      8. 2.12.8  FSI
      9. 2.12.9  JTAG
      10. 2.12.10 Test Automation Header
      11. 2.12.11 LIN
      12. 2.12.12 MMC
      13. 2.12.13 ADC and DAC
    13. 2.13 HSEC Pinout and Pinmux Mapping
  7. 3Software
    1. 3.1 SDK Installation
  8. 4Hardware Design Files
  9. 5Additional Information
    1. 5.1 Trademarks
    2. 5.2 E1 Design Hardware Modifications
  10. 6References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design

5.2 E1 Design Hardware Modifications

The following section describes the hardware modifications that were made to each E1 Control Card.

  1. TUSB320 CC Controller GPIO Mode
    • The TUSB320 is intended to be used in the GPIO mode to negotiate whether the type-C CC pins represent a power source that is an excellent choice for the Control Card. For the TUSB320 to be GPIO mode, the ADDR pin needs to floating and therefore R170 was removed.
    • Modification 1:
      • Depopulate R170
      GUID-A4E9FCEB-7D2D-4E26-9394-92014388EF44-low.png Figure 5-1 Modification 1
  2. Bypass PMIC VSYS_3V3C Power
    • The PMIC LDO output VSOUT2 is used to power the VSYS_3V3C power net. VSYS_3V3C is used to power loads for various peripheral circuits, many of which are required for AM263x reset and boot.
    • The PMIC LDO output VSOUT2 is disabled by default and requires a SPI register write from the AM263x to enable after initial start-up.
    • As a workaround, the VSYS_3V3C rail is shorted with the VSYS_3V3A PMIC output.
    • Modification 2:
      • Lift pin U30.29 from PMIC to disconnect LDO output of PMIC
      • Short TP359 and TP362 using 22GA wire
      GUID-689AE452-78D7-4EFE-9B7A-41713C7E6EC0-low.png Figure 5-2 Modification 2
  3. TPS37042A30 Startup RESET Output Transients
    • The TPS37042A3O power supervisor (U187) open-drain outputs RESET1# and RESET2# cause transient PORZ assertions during initial 3.3V (VSYS_3V3A) and 1.2V (VSYS_1V2) power-on.
    • These open-drain outputs are pulled to USB-C/HSEC supplied VMAIN 5.0V supply. That VMAIN supply showed noisy behavior during start-up and caused these open-drain I/O to provide a faulty PORZ. Changing U187 RESET1# and RESET2# output pull-up resistors to reference PMIC supplied VDD_5V0 creates a functional PORZ.
    • Modification 3:
      • Remove R1640
      • Install 10 kΩ pull-up resistor on the RESET# output pad of the R1640 resistor position
      • Attach the other 10 kΩ resistor pad to the VDD_5V0 power net
      GUID-1FDDE629-4583-4873-AE78-7BB2099A46A2-low.png Figure 5-3 Modification 3