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Texas Instruments LM3S2678-IQR50-A0T
- Part No.:
- LM3S2678-IQR50-A0T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
LM3S2678-IQR50-A0T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
LM3S2678-IQR50-A0T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated CAN 2.0A/B controller, 12-bit 1-MSPS ADC (8-channel), and dual UARTs with IrDA support. It operates at 50 MHz and targets motor control and industrial automation systems requiring real-time communication and analog sensing.
For engineers reviewing the LM3S2678-IQR50-A0T datasheet, LM3S2678-IQR50-A0T pinout, LM3S2678-IQR50-A0T application, or LM3S2678-IQR50-A0T equivalent, key selection criteria include CAN interface capability, on-chip flash/SRAM size, ADC resolution and sampling rate, operating frequency, and QFP-100 package compatibility for industrial PCB layouts.
Technical Context
The LM3S2678-IQR50-A0T implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, supporting Thumb-2 instruction set and deterministic interrupt latency down to 12 cycles. Its system-level architecture integrates μDMA with 32-channel support and configurable arbitration for peripheral-to-memory transfers without CPU intervention.
Peripheral integration includes a dedicated CAN 2.0A/B controller with 32 message objects, hardware FIFO, and programmable bit timing; plus dual UARTs with SIR encoding, 12-bit ADC with four independent sample sequencers, and eight 16/32-bit general-purpose timers with PWM and RTC modes - all clocked from a single PLL-based system clock tree.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max operation - enables deterministic real-time task scheduling and low-latency interrupt response in motor control loops. |
| Flash Memory | 256 KB on-chip flash with 1-KB sectors - sufficient for firmware + bootloader + parameter storage in standalone embedded controllers. |
| SRAM | 64 KB on-chip SRAM - supports large buffers for CAN message queues, ADC data streaming, and real-time stack usage. |
| ADC | 12-bit, 1-MSPS, 8-channel SAR ADC with four sequencers - allows concurrent sampling of motor phase currents, temperature, and voltage rails. |
| CAN Interface | Dedicated CAN 2.0A/B controller with 32 message objects and hardware FIFO - eliminates software overhead for CAN bus arbitration and message filtering. |
| UARTs | Two UARTs with IrDA SIR support and 16-byte FIFOs - enables robust serial diagnostics and field device configuration via infrared or RS-232. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard industrial PCB assembly processes and thermal management requirements. |
Pinout & Package
LM3S2678-IQR50-A0T is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C) and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital, analog, and core power domains enable noise isolation for ADC accuracy and stable CPU operation. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog and core ground planes reduce coupling between high-speed digital switching and precision analog circuits. |
| PA0–PA7, PB0–PB7, etc. | GPIO banks A–G | Configurable 5-V-tolerant I/O with slew-rate control and programmable pull-up/down - supports direct interface to sensors, encoders, and discrete actuators. |
| CAN0RX / CAN0TX | CAN physical layer interface | Differential CAN bus transceiver pins compliant with ISO 11898-1; require external transceiver for bus connection. |
| U0RX / U0TX / U1RX / U1TX | UART serial I/O | Asynchronous TTL-level transmit/receive signals; U0 supports IrDA modulation/demodulation in hardware. |
| SSI0CLK / SSI0FSS / SSI0RX / SSI0TX | Synchronous serial interface | Full-duplex SPI-compatible interface for connecting to digital sensors, EEPROMs, or display controllers with DMA support. |
| ADC0CH0–ADC0CH7 | Analog input channels | Eight single-ended or four differential analog inputs routed to internal 12-bit ADC with programmable sample timing. |
| XTAL / OSC0 | Crystal oscillator input/output | Supports 1–25 MHz crystal or external clock source for precise system timing and CAN bit-rate generation. |
Key Features
| Feature | Design Value |
|---|---|
| ARM Cortex-M3 core with NVIC | Hardware-based nested interrupt handling with 8-level priority per vector - ensures sub-1-μs response to critical motor fault events. |
| μDMA controller (32 channels) | Offloads CPU from peripheral data movement - enables zero-CPU-overhead CAN message buffering and ADC result streaming to memory. |
| Dual UART with IrDA SIR | Integrated infrared encoder/decoder - eliminates external SIR IC for remote commissioning and service interface in sealed enclosures. |
| Four independent ADC sample sequencers | Allows overlapping trigger sources (timer, GPIO, software) and automatic channel sequencing - simplifies multi-sensor acquisition without CPU polling. |
| On-chip ROM with StellarisWare drivers | Pre-certified peripheral initialization and abstraction libraries - reduces firmware development time for CAN, UART, and timer subsystems. |
Applications
| Industrial Motor Control | Factory Automation Node |
|---|---|
Use Scenario: Closed-loop control of 3-phase BLDC motors using hall-effect or encoder feedback, with real-time current sensing and CAN-based command distribution. IC Role / Device Role / Timing Role: Central real-time controller executing FOC algorithms, managing PWM generation, sampling analog currents/voltages, and exchanging status/control messages over CAN. Use Value: Integrated 12-bit ADC with sequencer-triggered sampling and CAN controller with hardware message filtering reduce BOM count and ensure deterministic loop timing at 50 kHz update rates. | Use Scenario: Standalone I/O concentrator collecting digital inputs (limit switches, safety interlocks), analog sensor data (pressure, temperature), and driving local relays/LEDs in PLC-adjacent machinery. IC Role / Device Role / Timing Role: Edge-node intelligence unit performing local logic, analog preprocessing, and protocol translation between field devices and higher-level CANopen network. Use Value: 64 KB SRAM buffers transient sensor bursts; dual UARTs enable simultaneous HMI debug port and fieldbus configuration interface without multiplexing. |
| Energy Monitoring Gateway | Building HVAC Controller |
Use Scenario: Sub-metering node aggregating current/voltage measurements from CTs and shunts across multiple circuits, computing real-time power metrics, and reporting via CAN to central dashboard. IC Role / Device Role / Timing Role: Data acquisition and edge computation engine performing RMS calculation, harmonic analysis, and event logging with timestamped CAN alerts. Use Value: 1-MSPS ADC captures fast transients; 256 KB flash stores firmware, calibration tables, and rolling 72-hour energy logs without external memory. | Use Scenario: Dedicated zone controller regulating chilled water valves, fan speeds, and damper positions based on local temperature/humidity readings and schedule commands received over CAN. IC Role / Device Role / Timing Role: Real-time environmental regulator executing PID loops, managing actuator drive timing, and maintaining communication uptime on noisy building automation networks. Use Value: CAN 2.0B compatibility ensures interoperability with BACnet MS/TP gateways; 8 GPIO banks simplify wiring to diverse HVAC sensors and actuators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S2671-IQR50-A0T | Same core and peripherals but with 128 KB flash and 32 KB SRAM - no CAN controller. | Lacks integrated CAN; requires external transceiver + software stack for bus communication. | Select when CAN is unnecessary and cost-sensitive designs prioritize smaller code footprint. |
| TM4C123GH6PM | Successor part with 256 KB flash, 32 KB SRAM, enhanced CAN, USB, and floating-point unit - same 100-pin LQFP package. | Higher performance, broader peripheral set, and active production status; requires firmware migration. | Choose for new designs needing long-term availability, USB connectivity, or improved math throughput. |
Compared with LM3S2678-IQR50-A0T, LM3S2671-IQR50-A0T reduces memory and omits CAN entirely, while TM4C123GH6PM retains pin compatibility and expands capabilities - making it the preferred upgrade path for lifecycle replacement and feature expansion.
Availability
LM3S2678-IQR50-A0T is available at Aetrix Electronics and suitable for industrial motor control, factory automation nodes, and energy monitoring gateways requiring stable component supply and long-lifecycle support.
Supply support for LM3S2678-IQR50-A0T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial control applications requiring integrated CAN, high-resolution ADC, and deterministic ARM Cortex-M3 execution - targeting motor drives, PLC modules, and smart sensors.
FAQ
What is the maximum operating frequency of the LM3S2678-IQR50-A0T?
The LM3S2678-IQR50-A0T operates at a maximum system clock frequency of 50 MHz, derived from an internal PLL that accepts input from an external crystal (1–25 MHz) or oscillator. This frequency is specified under industrial temperature conditions (–40°C to +85°C) and supports deterministic real-time execution for motor control and automation tasks. The LM3S2678-IQR50-A0T maintains full peripheral functionality-including CAN, ADC, and UART-at this speed without throttling.
Does the LM3S2678-IQR50-A0T include an integrated CAN transceiver?
No, the LM3S2678-IQR50-A0T contains only a CAN protocol controller compliant with CAN 2.0A/B standards; it requires an external CAN transceiver (e.g., SN65HVD230) to drive the physical bus. The LM3S2678-IQR50-A0T provides CAN0RX and CAN0TX signals referenced to VDDIO, which must be level-shifted and differential-driven by the external transceiver. This separation ensures flexibility in bus voltage selection and EMC optimization.
What ADC resolution and sampling rate does the LM3S2678-IQR50-A0T support?
The LM3S2678-IQR50-A0T features a single 12-bit successive-approximation register (SAR) ADC capable of up to 1 million samples per second (1-MSPS). It supports eight single-ended or four differential input channels, with four independent sample sequencers enabling triggered, timed, or processor-initiated conversions. The LM3S2678-IQR50-A0T's ADC includes hardware averaging and internal temperature sensor output, usable for system-level thermal monitoring.
Is the LM3S2678-IQR50-A0T pin-compatible with other Stellaris LM3S devices?
The LM3S2678-IQR50-A0T uses a 100-pin LQFP package with a defined pinout documented in Section 1.4.8 and Table 1-3 of its datasheet. While several LM3S devices share the same 100-pin LQFP footprint, pin functions differ significantly across variants - especially for peripheral mapping (e.g., CAN, SSI, UART assignments). The LM3S2678-IQR50-A0T is not pin-compatible with LM3S2671 or LM3S811 without board redesign due to functional pin reassignments.
What development tools are supported for the LM3S2678-IQR50-A0T?
Texas Instruments officially supports the LM3S2678-IQR50-A0T with Keil MDK-ARM, IAR Embedded Workbench, and TI's Code Composer Studio v5.x and earlier. StellarisWare Peripheral Driver Library - precompiled in ROM and accessible via API - provides tested drivers for CAN, UART, ADC, and timers. Evaluation is enabled via the LM3S811 Evaluation Kit (EK-LM3S811), though hardware abstraction layers require minor adaptation for LM3S2678-IQR50-A0T-specific peripherals like dual UARTs and expanded GPIO.
LM3S2678-IQR50-A0T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 64-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 2000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- CANbus, IrDA, Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 33
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.25V ~ 2.75V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S2678-IQR50-A0T FAQ
1.How can I place an order for LM3S2678-IQR50-A0T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S2678-IQR50-A0T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3S2678-IQR50-A0T reliable?
The price and inventory of LM3S2678-IQR50-A0T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S2678-IQR50-A0T is usually 5 days.
3.What payment methods are accepted for LM3S2678-IQR50-A0T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S2678-IQR50-A0T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S2678-IQR50-A0T?
LM3S2678-IQR50-A0T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S2678-IQR50-A0T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3S2678-IQR50-A0T?
For technical support, including LM3S2678-IQR50-A0T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S2678-IQR50-A0T requirements.
6.How does Aetrix verify that LM3S2678-IQR50-A0T is sourced from the original manufacturer or authorized distributors?
All LM3S2678-IQR50-A0T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3S2678-IQR50-A0T meets industry standards.
7.What is the process for return or replacement of LM3S2678-IQR50-A0T?
All LM3S2678-IQR50-A0T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S2678-IQR50-A0T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3S2678-IQR50-A0T part is unused and in its original packaging.
Return procedure for LM3S2678-IQR50-A0T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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