Texas Instruments Stellaris LM3S2965 User manual

EK-LM3S2965-08 Copyright © 2007–2010 Texas Instruments
User’s Manual
Stellaris® LM3S2965 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® LM3S2965 Evaluation Board
January 6, 2010 3
Table of Contents
Chapter 1: Stellaris® LM3S2965 Evaluation Board .......................................................................................7
Features..............................................................................................................................................................8
Block Diagram ....................................................................................................................................................9
Evaluation Kit Contents ....................................................................................................................................10
Evaluation Board Specifications ...................................................................................................................10
CAN Device Board Specifications.................................................................................................................10
Features of the LM3S2965 Microcontroller.......................................................................................................10
Chapter 2: Hardware Description..................................................................................................................13
LM3S2965 Evaluation Board............................................................................................................................13
LM3S2965 Microcontroller Overview............................................................................................................13
CAN Module..................................................................................................................................................13
Clocking........................................................................................................................................................13
Reset.............................................................................................................................................................13
Power Supplies.............................................................................................................................................14
Debugging.....................................................................................................................................................14
USB Functions..................................................................................................................................................15
USB Overview...............................................................................................................................................15
USB to JTAG/SWD.......................................................................................................................................15
Virtual COM Port...........................................................................................................................................15
Serial Wire Out..............................................................................................................................................15
Organic LED Display ........................................................................................................................................15
Features........................................................................................................................................................15
Control Interface ...........................................................................................................................................16
Power Supply................................................................................................................................................16
Design Guidelines.........................................................................................................................................16
Further Reference.........................................................................................................................................16
Other Peripherals..............................................................................................................................................16
Speaker.........................................................................................................................................................16
Push Switches ..............................................................................................................................................16
User LED ......................................................................................................................................................16
Bypassing Peripherals......................................................................................................................................16
Interfacing to the EVB.......................................................................................................................................17
Using the In-Circuit Debugger Interface ...........................................................................................................17
Chapter 3: CAN Device Board Hardware Description.................................................................................19
Device Overview...............................................................................................................................................19
Power Supply................................................................................................................................................19
Programming and Debugging.......................................................................................................................19
Interfacing.....................................................................................................................................................19
Appendix A: Schematics................................................................................................................................21
Appendix B: Connection Details...................................................................................................................27
Component Locations.......................................................................................................................................27
Evaluation Board Dimensions...........................................................................................................................28

4January 6, 2010
I/O Breakout Pads ............................................................................................................................................29
Recommended Connectors..............................................................................................................................30
ARM Target Pinout ...........................................................................................................................................31
References .......................................................................................................................................................31

Stellaris® LM3S2965 Evaluation Board
January 6, 2010 5
List of Figures
Figure 1-1. Stellaris LM3S2965 Evaluation Board Layout.................................................................................7
Figure 1-2. Stellaris LM3S2110 CAN Device Board..........................................................................................8
Figure 1-3. LM3S2965 Evaluation Board Block Diagram ..................................................................................9
Figure 1-4. LM3S2110 CAN Device Board Block Diagram ...............................................................................9
Figure 2-1. ICD Interface Mode .......................................................................................................................18
Figure B-1. Component Locations ...................................................................................................................27
Figure B-2. LM3S2965 Evaluation Board Dimensions.....................................................................................28
Figure B-3. LM3S2110 CAN Device Board Dimensions..................................................................................28
Figure B-4. LM3S2110 CAN Device Board Connections.................................................................................30

6January 6, 2010
List of Tables
Table 2-1. Stellaris LM3S2965 Evaluation Board Hardware Debugging Configurations................................14
Table 2-2. Isolating On-Board Hardware........................................................................................................17
Table B-1. I/O Breakout Pads.........................................................................................................................29
Table B-2. Recommended Connectors...........................................................................................................30
Table B-3. 20-Pin JTAG/SWD Configuration..................................................................................................31

January 6, 2010 7
Stellaris® LM3S2965 Evaluation Board
The Stellaris® LM3S2965 Evaluation Board is a compact and versatile evaluation platform for the
Stellaris LM3S2965 ARM® Cortex™-M3-based microcontroller. The evaluation kit demonstrates a
complete controller area network (CAN) using two Stellaris microcontrollers. The main evaluation
board (EVB) configures a Stellaris LM3S2965 microcontroller as a CAN host. A small CAN device
board, linked with a ribbon cable, uses a Stellaris LM3S2110 microcontroller. The function of each
board is fully configurable in software.
You can use the board either as an evaluation platform or as a low-cost in-circuit debug interface
(ICDI). In debug interface mode, the on-board microcontroller is bypassed, allowing for
programming or debugging of an external 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 for CAN. The kit also includes extensive source-code examples, allowing you to
start building C code applications quickly.
Figure 1-1. Stellaris LM3S2965 Evaluation Board Layout
USB Device
Interface CAN bus connector
40 pin I/O
break-out
header
34 pin I/O
break-out
header
Navigation
Switches
Select switch
Status LED
Speaker
Debug-out LED
Reset switch
Power LED
OLED Graphics
Display
JTAG/SWD
input and
output
Stellaris®
LM3S2965
Microcontroller In-circuit Debug
Interface
CHAPTER 1

Stellaris® LM3S2965 Evaluation Board
8January 6, 2010
Figure 1-2. Stellaris LM3S2110 CAN Device Board
Features
The Stellaris LM3S2965 Evaluation Kit includes the following features:
Stellaris LM3S2965 microcontroller with fully-integrated CAN module
Standalone CAN device board using Stellaris LM3S2110 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
Magnetic speaker
LM3S2965 I/O available on labeled break-out pads
Standard ARM® 20-pin JTAG debug connector with input and output modes
USB interface for debugging and power supply
User switches
CAN bus connector
I/O break-out
headers
Power LED
Reset switch
Status LED
JTAG/SWD
input
Stellaris®
LM3S2110
Microcontroller

Stellaris® LM3S2965 Evaluation Board
January 6, 2010 9
Block Diagram
Figure 1-3. LM3S2965 Evaluation Board Block Diagram
Figure 1-4. LM3S2110 CAN Device Board Block Diagram
USB
USB Stellaris
LM3S2965
Microcontroller
Dual
USB
Device
Controller
I/OSignals
OLED Display
128 x 96
Debug
I/O Signal Break-out
JTAG/SWD
Output/Input
USB Cable
Reset
+3.3V
Regulator
SWD/JTAG
Mux
UART0
Target
Cable
CAN PHY CAN0CAN Switch
Nav
Switch
Speaker
LED
LM3S2965 CAN
Evaluation Board
I/O Signal Break-out
I/O Signal Break-out
I/O Signal Break-out
USB
Stellaris
LM3S2110
Microcontroller
I/O Signals
Debug
I/O Signal Break-out
I/O Signal Break-out
JTAG/SWD
Input +3.3V
Regulator
CAN PHY CAN0CAN
Switch
LED
LM3S2110
CAN Device
Board
Reset
Switch

Stellaris® LM3S2965 Evaluation Board
10 January 6, 2010
Evaluation Kit Contents
The evaluation kit contains everything needed to develop and run applications for Stellaris
microcontrollers including:
LM3S2965 evaluation board (EVB)
LM3S2110 CAN device board
USB cable
20-pin JTAG/SWD target cable
10-pin CAN 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
Board supply current: 120 mA typ (fully active, CPU at 50 MHz)
200 mA (fully active, with sound)
Break-out power output: 3.3 Vdc (60 mA max), 12 Vdc (15 mA max)
Dimensions: 4.1” x 2.45” x 0.7” (LxWxH)
CAN Device Board Specifications
Board supply voltage: 4.0-5.0 Vdc from CAN connector
Board supply current: 40 mA typical
Dimensions: 2.45” x 1.60” (LxW)
Features of the LM3S2965 Microcontroller
32-bit RISC performance using ARM® Cortex™-M3 v7M architecture
–50-MHz operation
–Hardware-division and single-cycle-multiplication
–Integrated Nested Vectored Interrupt Controller (NVIC)
–27 interrupt channels with eight priority levels

Stellaris® LM3S2965 Evaluation Board
January 6, 2010 11
256-KB single-cycle flash
64-KB single-cycle SRAM
Four general-purpose 32-bit timers
Controller area network (CAN) module
Three fully programmable 16C550-type UARTs
Four 10-bit 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
–One PWM generator
–One dead-band generator
Two QEI modules with position integrator for tracking encoder position
Two synchronous serial interfaces (SSIs)
3 to 56 GPIOs, depending on user configuration
On-chip low drop-out (LDO) voltage regulator

Stellaris® LM3S2965 Evaluation Board
12 January 6, 2010

January 6, 2010 13
Hardware Description
In addition to a microcontroller, the Stellaris LM3S2965 evaluation board includes a range of useful
peripherals and an integrated ICDI. This chapter describes how these peripherals operate and
interface to the microcontroller.
LM3S2965 Evaluation Board
LM3S2965 Microcontroller Overview
The heart of the EVB is a Stellaris LM3S2965 ARM Cortex-M3-based microcontroller. The
LM3S2965 offers 256-KB flash memory, 50-MHz operation, a CAN module, and a wide range of
peripherals. Refer to the LM3S2965 data sheet (order number DS-LM3S2965) for complete device
details.
The LM3S2965 microcontroller is factory programmed with a quickstart demo program. The
quickstart program resides in the LM3S2965 on-chip flash memory and runs each time power is
applied, unless the quickstart has been replaced with a user program.
CAN Module
A key feature of the LM3S2965 is its CAN module that enables highly reliable communications at
up to 1 Mbits/s. The LM3S2965 evaluation board includes a standard CAN transceiver and a
10-pin CAN connector whose signal assignments follow a commonly used CAN standard. A
simple adaptor (not included in the kit) can be used to allow the use of standard DB-9 CAN cables.
An on-board 120-ohm resistor provides bus termination. This resistor can be removed if the board
is not a network endpoint.
The CAN transceiver is configured in hardware to support speeds up to 1 Mbits/s. A resistor can
be added to reduce the transceiver's drive slew-rate for slower data rates over longer distances.
Clocking
The LM3S2965 microcontroller has three on-chip oscillators, two are implemented on the EVB. A
8.0-MHz crystal completes the LM3S2965’s main internal clock circuit. An internal PLL, configured
in software, multiples this clock to 50-MHz for core and peripheral timing. At initial power on, the
microcontroller operates directly from a 12-MHz internal oscillator.
Reset
The LM3S2965 microcontroller shares its external reset input with the OLED display. In the EVB,
reset sources are gated through the CPLD, though in a typical application a simple wired-OR
arrangement is sufficient.
Reset is asserted (active low) under any one of three conditions:
Power-on reset
Reset push switch SW1 held down
Internal debug mode—By the USB device controller (U5 FT2232) when instructed by
debugger
CHAPTER 2

Hardware Description
14 January 6, 2010
Power Supplies
The LM3S2965 is powered from a +3.3-V supply. A low drop-out (LDO) regulator regulates +5-V
power from the USB cable to +3.3-V. +3.3-V power is available for powering external circuits.
A +15-V rail is available when the OLED display is active. The speaker and OLED display boost-
converter operate directly from the +5-V rail.
Debugging
Stellaris microcontrollers support programming and debugging using either JTAG or SWD. JTAG
uses the signals TCK, TMS, TDI, and TDO. SWD requires fewer signals (SWCLK, SWDIO, and,
optionally, SWO, for trace). The debugger determines which debug protocol is used.
Debugging Modes
The LM3S2965 evaluation board supports a range of hardware debugging configurations. Table
summarizes these.
Modes 2 and 3 automatically detect the presence of an external debug cable. When the debugger
software is connected to the EVB's USB controller, the EVB automatically selects Mode 2 and
illuminates the red Debug Out LED. ICDI out (Mode 2) can be used to program and debug the
small LM3S2110 CAN device board included in the kit.
Debug In Considerations
Debug Mode 3 supports evaluation board debugging using an external debug interface. Mode 3 is
automatically selected when a device such as a Segger J-Link or Keil ULINK is connected.
Boards marked Revision C or later automatically configure pin 1 to be a 3.3-V reference, if an
external debugger is connected. To determine the revision of your board, locate the product
number on the bottom of the board; for example, EK-LM3S2965-C. The last character of the
product number identifies the board revision.
A configuration or board-level change may be necessary when using an external debug interface
with revisions A and B of this evaluation board. Because the evaluation board supports both debug
out and debug in modes, pin 1 of the 20-pin JTAG/SWD header is, by default, not connected to
+3.3 V. Consequently, devices requiring a voltage on pin 1 to power their line buffers may not
work.
Table 2-1. Stellaris LM3S2965 Evaluation Board Hardware Debugging Configurations
Mode Debug Function Use Selected by
1 Internal ICDI Debug on-board LM3S2965
microcontroller over USB
interface.
Default mode
2 ICDI out to JTAG/SWD header The EVB is used as a USB
to SWD/JTAG interface to
an external target.
Connecting to an external
target and starting debug
software. The red Debug
Out LED will be ON.
3 In from JTAG/SWD header For users who prefer an
external debug interface
(ULINK,JLINK,etc.) withthe
EVB.
Connecting an external
debugger to the JTAG/SWD
header

Stellaris® LM3S2965 Evaluation Board
January 6, 2010 15
Two solutions exist. Some debugger interfaces (such as ULINK) have an internal power jumper
that, in this case, should be set to internal +3.3-V power. Refer to debugger interface
documentation for full details. However, if your debugger interface does not have a selectable
power source, it may be necessary to install a 0-Ωresistor on the evaluation board to route power
to pin 1. Refer to the schematics and board drawing in the appendix of this manual for the location
of this resistor.
USB Functions
USB Overview
An FT2232 device from Future Technology Devices International Ltd manages USB-to-serial
conversion. The FT2232 is factory configured to implement a JTAG/SWD port (synchronous serial)
on channel A and a Virtual COM Port (VCP) on channel B. This feature allows two simultaneous
communications links between the host computer and the target device using a single USB cable.
Separate Windows drivers for each function are provided on the Documentation and Software CD.
A small serial EEPROM holds the FT2232 configuration data. The EEPROM is not accessible by
the LM3S2965 microcontroller.
For full details on FT2232 operation, go to www.ftdichip.com.
USB to JTAG/SWD
The FT2232 USB device performs JTAG/SWD serial operations under the control of the debugger.
A CPLD (U4) multiplexes SWD and JTAG functions and, when working in SWD mode, provides
direction control for the bidirectional data line.
Virtual COM Port
The Virtual COM Port (VCP) allows Windows applications (such as HyperTerminal) to
communicate with UART0 on the LM3S2965 over USB. Once the FT2232 VCP driver is installed,
Windows assigns a COM port number to the VCP channel.
Serial Wire Out
The evaluation board supports the Cortex-M3 serial-wire output (SWO) trace capabilities. Under
debugger control, the CPLD can route the SWO datastream to the virtual communication port
(VCP) transmit channel. The debugger can then decode and interpret the trace information
received from the VCP. The normal VCP connection to UART0 is interrupted when using SWO. Not
all debuggers support SWO. Refer to the Stellaris LM3S3748 data sheet for additional information
on the trace port interface unit (TPIU).
Organic LED Display
The EVB features an Organic LED (OLED) graphics display with 128 x 64 pixel resolution. OLED
is a new technology that offers many advantages over LCD display technology.
Features
RiT P14201 series display
128 columns by 96 rows
High-contrast (typ. 500:1)
Excellent brightness (120 cd/m2)

Hardware Description
16 January 6, 2010
Fast response
Control Interface
The OLED display has a built-in controller IC with synchronous serial and parallel interfaces.
Synchronous serial (SSI) is used on the EVB as it requires fewer microcontroller pins. Data cannot
be read from the OLED controller; only one data line is necessary. Stellaris® Firmware
Development Package (included on the Documentation and Software CD) contains complete
drivers with source-code for the OLED display.
Power Supply
A +15-V supply is needed to bias the OLED display. A FAN5331 device from Fairchild combines
with a few external components to complete a boost converter. A few external components
complete the switching power supply. When the OLED display is operating, a small amount of
power can be drawn from the +12-V rail to power other devices.
Design Guidelines
The OLED display has a lifetime of about 13,000 hours. It is also prone to degradation due to
burn-in, similar to CRT and plasma displays. The quickstart application includes both a screen
saver and a power-down mode to extend display life. These factors should be considered when
developing EVB applications that use the OLED display.
Further Reference
For additional information on the RiT OLED display, visit www.ritekdisplay.com.
Other Peripherals
Speaker
A small, magnetic audio transducer connects through a MOSFET to PD1/PWM1, allowing a range
of options for generating simple and complex tones. Use of the +5-V rail reduces switching noise
on the +3.3-V rail.
Push Switches
The EVB has five general-purpose input switches. Four are arranged in a navigation-style
configuration. The fifth functions as a Select switch.
User LED
A user LED (LED1) is provided for general use. The LED is connected to PG2/PWM0, allowing the
option of either GPIO or PWM control (brightness control). Refer to the Quickstart Application
source code for an example of PWM control.
Bypassing Peripherals
Excluding CAN and JTAG, the EVB’s on-board peripheral circuits require 13 GPIO lines. This
leaves 40 GPIO lines and 4 ADC channels immediately available for connection to external
circuits. If an application requires more GPIO lines the on-board hardware can be disconnected.
The EVB is populated with 3 jumper links, which can be cut with a knife to isolate on-board
hardware. The process can be reversed by installing 0603- 0-ohm chip resistors.

Stellaris® LM3S2965 Evaluation Board
January 6, 2010 17
Important: The quickstart application will not run if one or more jumpers are removed.
Interfacing to the EVB
An array of accessible I/O signals makes it easy to interface the EVB to external circuits. All
LM3S2965 I/O lines (except those with both JTAG and SWD functions) are brought out to 0.1”
pitch pads. For quick reference, silk-screened labels on the PCB show primary pin functions.
Table B-1 on page 29 has a complete list of I/O signals as well as recommended connectors.
Most LM3S2965 I/O signals are +5-V tolerant. Refer to the LM3S2965 data sheet for detailed
electrical specifications.
Using the In-Circuit Debugger Interface
The Stellaris LM3S2965 Evaluation Kit can operate as an In-Circuit Debugger Interface (ICDI).
ICDI acts as a USB to the JTAG/SWD adaptor, allowing debugging of any external target board
that uses a Stellaris microcontroller. See “Debugging Modes” on page 14 for a description of how
to enter Debug Out mode.
Table 2-2. Isolating On-Board Hardware
MCU Pin MCU Assignment To Isolate, Remove...
Pin 26 PA0/U0RX Virtual COM port receive JP1
Pin 27 PA1/U0TX Virtual COM port transmit JP2
Pin 16 PG3/PWM1 Sound JP5
Pin 31 PA5/SSI0TX OLED display data in JP7
Pin 28 PA2/SSI0CLK OLED display clock JP6
Pin 22 PC7/C2- OLED display data/control select JP3
Pin 29 PA3/SSI0FSS OLED display chip select JP4
Pin 46 PF5 Down switch JP8
Pin 43 PF6 Left switch JP9
Pin 58 PF4 Up switch JP10
Pin 42 PF7 Right switch JP11
Pin 41 PG4 Select switch JP12
Pin 47 PG2/PWM0 User LED JP13
Pin 23 PC6/C2+ Enable +15 V JP14

Hardware Description
18 January 6, 2010
Figure 2-1. ICD Interface Mode
The debug interface operates in either serial-wire debug (SWD) or full JTAG mode, depending on
the configuration in the debugger IDE.
The IDE/debugger does not distinguish between the on-EVB Stellaris microcontroller and an
external Stellaris microcontroller. The only requirement is that the correct Stellaris device is
selected in the project configuration.
Evaluation Board Target
Board
Stellaris
MCU
Target
Cable
`
USB
PC with IDE/
debugger
Stellaris
MCU
TCK/SWCLK bypasses the
on-board microcontroller
JTAG or SWD connects to the
external microcontroller
Connecting Pin 18 to GND sets
external debug mode

January 6, 2010 19
CAN Device Board Hardware Description
The CAN device board uses a Stellaris LM3S2110 microcontroller to demonstrate a complete
two-node network. The board can be used with the main LM3S2965 evaluation board or as a
standalone board.
Device Overview
The Stellaris LM3S2110 ARM Cortex-M3-based microcontroller has 64-KB flash memory, 25-MHz
operation, a CAN module, and a wide range of peripherals. For complete device details, see the
LM3S2110 data sheet (order number DS-LM3S2110).
The LM3S2110 microcontroller is factory programmed with a quickstart demonstration program
that adds a remote volume control feature to the quickstart application. The quickstart program
resides in the LM3S2110 on-chip flash memory and runs each time power is applied, unless the
quickstart has been replaced with a user program.
Power Supply
The CAN device board receives +5.0-V power from the CAN bus and should not be connected to
a CAN bus that ha a power wire voltage of greater than 10.0 V. If the bus is unpowered, a +5.0-V
local power supply must be provided. The LM3S2110 is powered from a +3.3-V rail, supplied by a
low drop-out (LDO) regulator. +3.3-V power is available for powering external circuits.
Programming and Debugging
A standard two-way header supports both JTAG And SWD programming and debugging using
either the main LM3S2965 board in ICDI out mode or a full-featured debug interface.
Interfacing
Two push switches and an LED implement a very simple user interface. The board’s capabilities
are easily expanded using the I/O breakout headers. For breakout header signal assignments see
Figure B-4.‚ “LM3S2110 CAN Device Board Connections,” on page 30.
CHAPTER 3

CAN Device Board Hardware Description
20 January 6, 2010