TI's LM3S9B92 is a Stellaris family of MCUs featuring an ARM® CortexTM-M3 processor core, 80MHz operation, 100DMIPS performance, ARM Cortex SysTIck timer, Nested Vectored Interrupt Controller (NVIC), on-chip memory including 256KB Flash and 96KB Cycle SRAM with extensive interface and system integration, advanced motor control and analog features for industrial applications including telemetry, electronic POS machines, test and measurement equipment, network equipment and switching, factory automation, HVAC and building control , game consoles, motor controls, medical instruments and fire safety. This article describes the main features of the LM3S9B92, the block diagram, the microcontroller CPU block diagram, and the main features of the Stellaris® Robot Evaluation Board (EVALBOT), block diagrams, circuit diagrams, and bill of materials and component layout.
Texas Instruments is the industry leader in bringing 32-bit capabiliTIes and the full benefits of ARM® CortexTM-M3-based microcontrollers to the broadest reach of the microcontroller market. For current users of 8- and 16-bit MCUs, Stellaris with Cortex -M3 offers a direct path to the strongest ecosystem of development tools, software and knowledge in the industry. Designers who migrate to Stellaris benefit from great tools, small code footprint and outstanding performance. Even more important, designers can enter the ARM ecosystem with full Confidence in a compaTIble roadmap from $1 to 1 GHz. For users of current 32-bit MCUs, the Stellaris family offers the industry's first implementation of Cortex-M3 and the Thumb-2 instruction set. With blazingly-fast responsiveness, Thumb-2 technology Combines both 16-bit and 32-bit instructions to deliver the best balance of code density and performance. Thumb-2 uses 26 percent less memory than pure 32-bit code to reduce system cost while deliver Ing 25 percent better performance. The Texas Instruments Stellaris family of microcontrollers—the first ARM® CortexTM-M3 based controllers—brings high-performance 32-bit computing to cost-sensitive embedded microcontroller applications. These pioneering parts deliver customers 32-bit performance At a cost equivalent to legacy 8- and 16-bit devices, all in a package with a small footprint.
The LM3S9B92 microcontroller has the following features:
■ARM® CortexTM-M3 Processor Core
– 80-MHz operation; 100 DMIPS performance
– ARM Cortex SysTick Timer
– Nested Vectored Interrupt Controller (NVIC)
â– On-Chip Memory
– 256 KB single-cycle Flash memory up to 50 MHz; a prefetch buffer improves performance above 50 MHz
– 96 KB single-cycle SRAM
– Internal ROM loaded with StellarisWare software:
• Stellaris Peripheral Driver Library
• Stellaris Boot Loader
• Advanced Encryption Standard (AES) cryptography tables
• Cyclic Redundancy Check (CRC) error detection functionality
â– External Peripheral Interface (EPI)
– 8/16/32-bit dedicated parallel bus for external peripherals
– Supports SDRAM, SRAM/Flash memory, FPGAs, CPLDs
â– Advanced Serial Integration
– 10/100 Ethernet MAC and PHY
– Two CAN 2.0 A/B controllers USB 2.0 OTG/Host/Device
– Three UARTs with IrDA and ISO 7816 support (one UART with full modem controls)
– Two I2C modules
– Two Synchronous Serial Interface modules (SSI)
– Integrated Interchip Sound (I2S) module
â– System Integration
– Direct Memory Access Controller (DMA)
– System control and clocks including on-chip precision 16-MHz oscillator
– Four 32-bit timers (up to eight 16-bit), with real-time clock capability
– Eight Capture Compare PWM pins (CCP)
– Two Watchdog Timers
• One timer runs off the main oscillator
• One timer runs off the exact internal oscillator
– Up to 65 GPIOs, depending on configuration
• Highly flexible pin muxing allows use as GPIO or one of several peripheral functions
• Independently configurable to 2, 4 or 8 mA drive capability
• Up to 4 GPIOs can have 18 mA drive capability
â– Advanced Motion Control
– Eight advanced PWM outputs for motion and energy applications
– Four fault inputs to promote low-latency shutdown
– Two Quadrature Encoder Inputs (QEI)
â– Analog
– Two 10-bit Analog-to-Digital Converters (ADC) with 16 analog input channels and sample rate of one million samples/second
– Three analog comparators
– 16 digital comparators
– On-chip voltage regulator
â– JTAG and ARM Serial Wire Debug (SWD)
â– 100-pin LQFP and 108-ball BGA package
■Industrial (-40°C to 85°C) Temperature Range
The LM3S9B92 microcontroller is targeted for industrial applications, including remote monitoring, electronic point-of-sale machines, test and measurement equipment, network appliances and switches, factory automation, HVAC and building control, gaming equipment, motion control, medical instrumentation, and fire And security.
In addition, the LM3S9B92 microcontroller offers the advantages of ARM's widely available development tools, System-on-Chip (SoC) infrastructure IP applications, and a large user community.
Additionally, the microcontroller uses ARM's Thumb®-compatible Thumb-2 instruction set to reduce memory requirements and, thus, cost. Finally, the LM3S9B92 microcontroller is code-compatible to all members of the extensive Stellaris family; providing flexibility to fit our customers' Precise needs.
Texas Instruments offers a complete solution to get to market quickly, with evaluation and development boards, white papers and application notes, an easy-to-use peripheral driver library, and a strong support, sales, and distributor network. See "Ordering and Contact Information†on page 1376 for ordering information for Stellaris family devices.
LM3S9B92 target application:
The Stellaris family is positioned for cost-conscious applications requiring significant control processing and connectivity capabilities such as:
â– Remote monitoring
â– Electronic point-of-sale (POS) machines
â– Test and measurement equipment
â– Network appliances and switches
â– Factory automation
â– HVAC and building control
â– Gaming equipment
â– Motion control
â– Medical instrumentation
â– Fire and security
â– Power and energy
â– Transportation
figure 1. Stellaris LM3S9B92 Microcontroller Block Diagram
figure 2. Stellaris LM3S9B92 Microcontroller CPU Block Diagram
Stellaris® Robot Evaluation Board (EVALBOT)
The Stellaris® Robotic Evaluation Board (EVALBOT) is a robotic evaluation platform for the Stellaris LM3S9B92 microcontroller. The board also uses a range of Texas Instruments' analog components for motor drive, power supply, and communications functions. After a few minutes of assembly, The EVALBOT's electronics are ready-to-run.
When roaming, three AA batteries supply power to the EVALBOT. The EVALBOT automatically selects USB power when tethered to a PC as a USB device or when debugging. Test points are provided to all key EVALBOT signals. Two 20-pin headers enable future wireless communications Using standardized Texas Instruments' low-power embedded radio modules (EM boards). Additional microcontroller signals are available on break-out pads arranged in rows adjacent to the microcontroller.
The EVALBOT has factory-installed quickstart software resident in on-chip Flash memory. For software debugging and Flash programming, an integrated In-Circuit Debug Interface (ICDI) requires only a single USB cable for debug and serial port functions.
image 3. Stellaris® Robot Evaluation Board (EVALBOT) Outline Drawing
Key features of the Stellaris® Robot Evaluation Board (EVALBOT):
The evaluation kit provides a hands-on mini robotic platform for learning and using the μC/OS-III real-time kernel. The evaluation kit includes the following features:
Evaluation board with robotic capabilities
Mechanical components assembled by user
Stellaris® LM3S9B92 microcontroller
MicroSD card connector
I2S audio codec with speaker
USB Host and Device connectors
RJ45 Ethernet connector
Bright 96 x 16 blue OLED display
On-board In-Circuit Debug Interface (ICDI)
Battery power (3 AA batteries) or power through USB
Wireless communication expansion port
Robot features:
Two DC gear-motors provide drive and steering
Opto-sensors detect wheel rotation with 45° resolution
Sensors for "bump" detection
Figure 4. Stellaris® Robot Evaluation Board (EVALBOT) Block Diagram
Figure 5. Stellaris® Robot Evaluation Board (EVALBOT) Circuit Diagram (1): MCU, Ethernet and USB
Figure 6. Stellaris® Robot Evaluation Board (EVALBOT) Circuit Diagram (2): Wheel Encoder, Motor Driver and Buffer Switch
Figure 7. Stellaris® Robot Evaluation Board (EVALBOT) Circuit Diagram (3): User Interface, Audio and SD Card
Figure 8. Stellaris® Robot Evaluation Board (EVALBOT) Circuit Diagram (4): Power Supply
Figure 9. Stellaris® Robot Evaluation Board (EVALBOT) Circuit Diagram (5): In the Circuit Debug Interface
EVALBOT Bill of Materials (BOM):
Figure 10. EVALBOT component layout
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