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Microcontroller, USB OTG, User/Navigation Switches, User LED, and GPIO Headers (Schematic page 1)
2.1
Microcontroller, USB OTG, User/Navigation Switches, User LED, and GPIO Headers
(Schematic page 1)
2.1.1 Microcontroller
The Tiva TM4C123GH6PGE is an ARM® Cortex™-M4-based microcontroller with 256-KB flash memory,
32-KB SRAM, 80-MHz operation, USB Host/Device/OTG, Hibernation module, and a wide range of other
peripherals. See the
Most of the microcontroller signals are routed to 0.1" pitch break-out pads and labeled with their GPIO
reference. An internal multiplexer allows different peripheral functions to be assigned to each of these
GPIO pads. When adding external circuitry, consideration should be given to the additional load on the
development board's power rails. The
and the code required to configure them.
The TM4C123GH6PGE microcontroller is factory-programmed with a quickstart data logger demo
program. The quickstart program resides in on-chip flash memory and runs each time power is applied,
unless the application has been replaced with a user program.
2.1.2 USB Host/Device/OTG
The DK-TM4C123G includes a USB Micro-AB (OTG) connector to allow for USB Host, Device, and OTG
operation. The following signals are used for USB OTG.:
GPIO Pin
PL6
PL7
PB0
PB1
PG4
PG5
In USB Host mode, the development board can provide power to the OTG connector. The USB0EPEN
signal controls the Channel 2 Enable (EN2) of a Texas Instruments' TPS2052B Load Switch (U7), which
enables power to the connector's VBUS pin. The POWER SELECT jumper must be in the "ICDI" position.
In Device mode, the development board can be powered from either the ICDI or the OTG connectors. The
user can select the power source by moving the POWER SELECT jumper to the appropriate position.
In OTG mode, the POWER SELECT jumper's position requires special consideration depending on the
system and code configuration.
8
Hardware Description
DS-TM4C123GH6PGE
microcontroller data sheet for complete device details.
Tiva PinMux Utility
Table 2-1. USB Host/Device/OTG Signals
Pin Function
USB0DP
USB0DM
USB0ID
USB0VBUS
USB0EPEN
USB0PFLT
Copyright © 2013–2014, Texas Instruments Incorporated
can be used to quickly develop pin assignments
USB OTG
D+
D-
ID
USB VBUS
Load Switch
USB VBUS Power Enable (EN2)
Power Fault ( OC2 )
SPMU357B – August 2013 – Revised March 2014
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