SPRUIW8 November   2020

 

  1.   Trademarks
  2. 1Board Overview
    1. 1.1 Kit Contents
    2. 1.2 Features
    3. 1.3 Specifications
    4. 1.4 Using the F28002x LaunchPad
    5. 1.5 BoosterPacks
    6. 1.6 Hardware Revisions
      1. 1.6.1 Revision A
  3. 2Software Development
    1. 2.1 Software Tools and Packages
    2. 2.2 F28002x LaunchPad Demo Program
    3. 2.3 Programming and Running Other Software on the F28002x LaunchPad
  4. 3Hardware Description
    1. 3.1 Functional Description and Connections
      1. 3.1.1  Microcontroller
      2. 3.1.2  LEDs
      3. 3.1.3  Encoder Connectors
      4. 3.1.4  FSI
      5. 3.1.5  CAN
      6. 3.1.6  CLB
      7. 3.1.7  Boot Modes
      8. 3.1.8  BoosterPack Headers
        1. 3.1.8.1 BoosterPack Sites
      9. 3.1.9  Analog Voltage Reference Header
      10. 3.1.10 Other Headers and Jumpers
        1. 3.1.10.1 USB Isolation Block
        2. 3.1.10.2 BoosterPack Site 2 Power Isolation
        3. 3.1.10.3 Alternate Power
        4. 3.1.10.4 5 V Step-up Converter
    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
      8. 3.3.8 Other GPIOs
  5. 4Board Design
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 BOM
    4. 4.4 LAUNCHXL-F280025C Board Dimensions
  6. 5Frequently Asked Questions
  7. 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 F28002x 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 eQEP signals are routed through TI SN74LV4053A Triple 2-Channel Analog Multiplexer/Demultiplexer ICs (U11/U14). Once the eQEP signals have been selected through U11/U14, the 3.3 V signals are stepped up through a TI SN74LVC8T245 Level Translator (U13) to 5 V at the connectors. 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 3-3.

Table 3-3 QEP Select Table - S5

QEP1 SEL (LEFT)

 QEP2 SEL (RIGHT)

QEP1 Signals

(GPIO44/37/43)

QEP2 Signals

(GPIO14/25/26)
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