SPRUJ31 april   2022

 

  1.   1
  2.   C2000 F28003x Series LaunchPad Development Kit
  3.   Trademarks
  4. 1Board Overview
    1. 1.1 Kit Contents
    2. 1.2 Features
    3. 1.3 Specifications
    4. 1.4 Using the F28003x LaunchPad
    5. 1.5 BoosterPacks
    6. 1.6 Hardware Revisions
      1. 1.6.1 Revision A
  5. 2Software Development
    1. 2.1 Software Tools and Packages
    2. 2.2 F28003x LaunchPad Demo Program
    3. 2.3 Programming and Running Other Software on the F28003x LaunchPad
  6. 3Hardware Description
    1. 3.1 Functional Description and Connections
      1. 3.1.1  Microcontroller
      2. 3.1.2  Power Domains
      3. 3.1.3  LEDs
      4. 3.1.4  Encoder Connectors
      5. 3.1.5  FSI
      6. 3.1.6  CAN
      7. 3.1.7  CLB
      8. 3.1.8  Boot Modes
      9. 3.1.9  BoosterPack Sites
      10. 3.1.10 Analog Voltage Reference Header
      11. 3.1.11 Other Headers and Jumpers
        1. 3.1.11.1 USB Isolation Block
        2. 3.1.11.2 BoosterPack Site 2 Power Isolation
        3. 3.1.11.3 Alternate Power
    2. 3.2 Debug Interface
      1. 3.2.1 XDS110 Debug Probe
      2. 3.2.2 XDS110 Output
      3. 3.2.3 Virtual COM Port
    3. 3.3 Alternate Routing
      1. 3.3.1 Overview
      2. 3.3.2 UART Routing
      3. 3.3.3 EQEP Routing
      4. 3.3.4 CAN Routing
      5. 3.3.5 FSI Routing
      6. 3.3.6 X1/X2 Routing
      7. 3.3.7 PWM DAC
  7. 4Board Design
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 BOM
    4. 4.4 LAUNCHXL-F280039C Board Dimensions
  8. 5Frequently Asked Questions
  9. 6References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design

3.3.3 EQEP Routing

The LaunchPad has the ability to connect to two independent linear or rotary encoders through the F28003x on-chip eQEP interfaces: Header J12 is connected to eQEP1 and header J13 is connected to eQEP2. By default, this connection is not active and the GPIOs are routed to the BoosterPack connectors. The 5 V eQEP input signals from the J12 and J13 connectors are stepped down through a TI SN74LVC8T245 Level Translator (U13) to 3.3 V. The signals are then routed through TI SN74LV4053A Triple 2-Channel Analog Multiplexer/Demultiplexer ICs (U11/U14). Switch S5 controls the select inputs of the ICs to configure the eQEP signal destinations to be either the J12/J13 connectors or BoosterPack headers, as described below in Table 3-5.

Table 3-5 QEP Select Table - S5
QEP1 SEL (LEFT) QEP2 SEL (RIGHT) QEP1 Signals
(GPIO40/41/59)		 QEP2 Signals
(GPIO14/55/57)
0 (down) 0 (down) J12 J13
0 (down) 1 (up) J12 BP Headers
1 (up) 0 (down) BP Headers J13
1 (up) 1 (up) BP Headers BP Headers