Texas Instruments Stellaris LM3S1968 User manual

EK-LM3S1968-03 Copyright © 2007–2010 Texas Instruments
User’s Manual
Stellaris® LM3S1968 Evaluation Board

2January 6, 2010
Copyright
Copyright © 2007–2010 Texas Instruments, Inc. All rights reserved. Stellaris and StellarisWare are registered trademarks of Texas Instruments.
ARM and Thumb are registered trademarks, and Cortex is a trademark of ARM Limited. Other names and brands may be claimed as the property
of others.
Texas Instruments
108 Wild Basin, Suite 350
Austin, TX 78746
http://www.ti.com/stellaris

Stellaris® LM3S1968 Evaluation Board
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Table of Contents
Chapter 1: Stellaris® LM3S1968 Evaluation Board .......................................................................................7
Features..............................................................................................................................................................8
Block Diagram ....................................................................................................................................................8
Evaluation Kit Contents ......................................................................................................................................9
Evaluation Board Specifications .....................................................................................................................9
Features of the LM3S1968 Microcontroller.........................................................................................................9
Chapter 2: Hardware Description..................................................................................................................11
LM3S1968 Evaluation Board............................................................................................................................11
LM3S1968 Microcontroller Overview............................................................................................................11
Hibernation Module.......................................................................................................................................11
Clocking........................................................................................................................................................11
Reset.............................................................................................................................................................11
Power Supplies.............................................................................................................................................12
Debugging.....................................................................................................................................................12
USB Device Controller Functions .....................................................................................................................13
USB Overview...............................................................................................................................................13
USB to JTAG/SWD.......................................................................................................................................13
Virtual COM Port...........................................................................................................................................13
Serial Wire Out..............................................................................................................................................14
Organic LED Display ........................................................................................................................................14
Virt(ual CO)-5.8(M Port)-78.1(.)-5.8(...)-5.8(...(...)-5.8(...)-5.8(....)-5.8(...)-5.8()-5.7(...)3-34...)-5.8(....)-5.8(...)-5.8(...)-Design Guidelin............................................................

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List of Tables
Table 2-1. Stellaris LM3S1968 Evaluation Board Hardware Debugging Configurations................................12
Table 2-2. Isolating On-Board Hardware........................................................................................................15
Table B-1. I/O Breakout Pads.........................................................................................................................27
Table B-2. Recommended Connectors...........................................................................................................28
Table B-3. 20-Pin JTAG/SWD Configuration..................................................................................................28

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List of Figures
Figure 1-1. Stellaris LM3S1968 Evaluation Board Layout.................................................................................7
Figure 1-2. LM3S1968 Evaluation Board Block Diagram ..................................................................................8
Figure 2-1. ICD Interface Mode .......................................................................................................................16
Figure B-1. Component Locations ...................................................................................................................25
Figure B-2. LM3S1968 Evaluation Board Dimensions.....................................................................................26

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Stellaris® LM3S1968 Evaluation Board
The Stellaris® LM3S1968 Evaluation Board is a compact and versatile evaluation platform for the
Stellaris LM3S1968 ARM® Cortex™-M3-based microcontroller. The evaluation kit design
highlights the LM3S1968 microcontroller's peripherals and its Hibernation module.
A 3V lithium battery, included in the kit, supplies power to the Hibernation module and maintains
data and real-time clock information for about two years in the absence of USB power.
You can use the EVB either as an evaluation platform or as a low-cost in-circuit debug interface
(ICDI). In debug interface mode, the on-board microcontroller is disabled, allowing connection of
the debug signals to an external Stellaris microcontroller target. The kit is also compatible with
high-performance external JTAG debuggers.
This evaluation kit enables quick evaluation, prototype development, and creation of
application-specific designs using the LM3S1968's broad range of peripherals. The kit also
includes extensive source-code examples, allowing you to start building C code applications
quickly.
Figure 1-1. Stellaris LM3S1968 Evaluation Board Layout
USB Device
Interface
Lithium coin cell
66 pin I/O break-out
header
Navigation
Switches
Select switch
Status LEDs
Speaker
Reset switch
Power LED
OLED Graphics
Display
JTAG/SWD input and output
Stellaris
TM
LM3S1968
Microcontroller
In-circuit Debug
Interface
Hibernate LED

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Features
The Stellaris LM3S1968 Evaluation Kit includes the following features:
Stellaris LM3S1968 microcontroller
Simple setup; USB cable provides serial communication, debugging, and power
OLED graphics display with 128 x 96 pixel resolution
User LED, navigation switches, and select pushbuttons
8Ωmagnetic speaker with class D amplifier
Internal 3 V battery and support for on-chip hibernation module
USB interface for debugging and power supply
Standard ARM® 20-pin JTAG debug connector with input and output modes
LM3S1968 I/O available on labeled break-out pads
Block Diagram
Figure 1-2. LM3S1968 Evaluation Board Block Diagram
USB
Stellaris
LM3S1968
Microcontroller

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Evaluation Kit Contents
The evaluation kit contains everything needed to develop and run applications for Stellaris
microcontrollers including:
LM3S1968 evaluation board (EVB)
USB cable
20-pin JTAG/SWD target cable
CD containing:
–A supported version of one of the following (including a toolchain-specific Quickstart
guide):
• Keil™ RealView® Microcontroller Development Kit (MDK-ARM)
• IAR Embedded Workbench
• Code Sourcery GCC development tools
• Code Red Technologies development tools
• Texas Instruments’ Code Composer Studio™ IDE
–Complete documentation
–Quickstart application source code
–Stellaris® Firmware Development Package with example source code
Evaluation Board Specifications
Board supply voltage: 4.37–5.25 Vdc from USB connector


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Eight 10-bit ADC channels (inputs) when used as single-ended inputs
Three independent integrated analog comparators
Two I2C modules
Three PWM generator blocks
–One 16-bit counter
–Two comparators
–Produces two independent PWM signals
–One dead-band generator
Two QEI modules with position integrator for tracking encoder position
5 to 52 GPIOs, depending on user configuration
On-chip low drop-out (LDO) voltage regulator
Hibernation module