Datasheet

Microcontroller, USB OTG, User/Navigation Switches, User LED, and GPIO Headers (Schematic page 1)

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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 DS-TM4C123GH6PGE microcontroller data sheet for complete device details.

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 Tiva PinMux Utility can be used to quickly develop pin assignments

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.:

Table 2-1. USB Host/Device/OTG Signals

GPIO Pin Pin Function USB OTG

PL6 USB0DP D+

PL7 USB0DM D-

PB0 USB0ID ID

PB1 USB0VBUS USB VBUS

Load Switch

PG4 USB0EPEN USB VBUS Power Enable (EN2)

PG5 USB0PFLT Power Fault ( OC2 )

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.

Hardware Description SPMU357B–August 2013–Revised March 2014

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