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Texas Instruments LM3S811-IQN50-C2T
- Part No.:
- LM3S811-IQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S811-IQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S811-IQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 256-byte EEPROM, and 8 KB SRAM, operating at up to 50 MHz. It integrates UART, I²C, SSI, ADC (8-channel, 10-bit), PWM, analog comparator, and GPIO peripherals - designed for real-time embedded control in industrial monitoring and motor drive interfaces.
For engineers reviewing the LM3S811-IQN50-C2T datasheet, LM3S811-IQN50-C2T pinout, LM3S811-IQN50-C2T application, or LM3S811-IQN50-C2T equivalent, key selection criteria include its 50 MHz CPU clock, QFP-100 package, integrated 10-bit ADC with temperature sensor, single UART with FIFO, and legacy StellarisWare software support.
Technical Context
The LM3S811-IQN50-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC interrupt controller, and SysTick timer. It supports sleep modes (sleep/deep-sleep) with wake-up via GPIO, UART, or timer events, and features memory protection unit (MPU) for system robustness.
Peripherals are accessed via APB bus with configurable clock gating. The ADC includes hardware averaging and internal temperature sensor; the PWM module supports dead-band generation and fault shutdown - both critical for motor control timing integrity and safety compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set - enables deterministic real-time execution and efficient code density. |
| Max Clock Speed | 50 MHz - defines maximum instruction throughput and peripheral timing margins for time-critical control loops. |
| Flash Memory | 64 KB - sufficient for firmware with bootloader, communication stack, and control algorithms in standalone edge nodes. |
| SRAM | 8 KB - supports real-time data buffering, stack/heap for RTOS tasks, and intermediate sensor processing. |
| ADC Resolution | 10-bit, 8-channel - provides adequate dynamic range for voltage/current sensing in industrial analog front-ends. |
| Package | 100-pin LQFP (IQN suffix), 14 × 14 mm body - compatible with standard PCB assembly and thermal management in compact enclosures. |
| Operating Temp | –40°C to +85°C (C2T suffix) - qualified for industrial environments without active cooling or derating. |
Pinout & Package
LM3S811-IQN50-C2T uses a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch and exposed thermal pad. Pin functions are defined per TI datasheet DS-LM3S811-15852.2743, Rev J, Section 16 (Pin Diagram) and Section 17 (Signal Tables).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 3.3 V nominal supply for CPU, memory, and digital logic - requires local 100 nF decoupling per power domain. |
| GND | Ground Reference | Analog/digital common return - must be low-impedance plane to minimize noise coupling into ADC and comparator. |
| PD0/U0RX | UART0 Receive Input | Asynchronous serial input supporting 8-N-1 framing - used for host command interface or debug console. |
| PD1/U0TX | UART0 Transmit Output | CMOS-level output with programmable drive strength - connects directly to RS-232 transceiver or TTL-level host. |
| PA0/SSI0CLK | SSI0 Clock Output | Synchronous serial clock for SPI-compatible sensors (e.g., accelerometers, ADCs) - configurable as master or slave. |
| PA1/SSI0FSS | SSI0 Frame Select | Active-low chip select for multi-device SSI bus - enables daisy-chained or independent peripheral addressing. |
| PE3/AIN0 | ADC Channel 0 Input | Analog input with 10-bit resolution and internal 1.65 V reference - accepts 0–3.3 V signals for direct sensor interfacing. |
| PF0/SSI1CLK | SSI1 Clock Output | Dedicated second SSI interface - allows concurrent communication with two SPI-based peripherals without software arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy - enables ambient/system thermal monitoring without external components. |
| Hardware ADC Averaging | Up to 64-sample hardware averaging per conversion - reduces noise in low-SNR analog measurements without CPU overhead. |
| Dual SSI Interfaces | Two independent synchronous serial controllers - supports simultaneous SPI communication with display driver and sensor array. |
| PWM Dead-Band Generation | Programmable delay between complementary outputs - prevents shoot-through in H-bridge motor drivers. |
| Memory Protection Unit (MPU) | Configurable region-based access control - isolates firmware, stack, and peripheral registers to prevent accidental corruption. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC motors using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time controller executing FOC algorithm, generating synchronized PWM with dead-band, sampling current/voltage via ADC, and communicating status over UART. Use Value: Integrated PWM fault handling and ADC hardware averaging reduce external component count and improve loop stability under electrical noise. | Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and light data for wireless transmission. IC Role / Device Role / Timing Role: Low-power system manager acquiring analog sensor data, performing basic calibration, storing logs in EEPROM, and waking periodically to transmit via UART-to-RF bridge. Use Value: Deep-sleep mode with GPIO/wake-on-UART and internal temperature sensor eliminate need for external supervisor IC or thermal diode. |
| PLC I/O Module | Embedded HMI Controller |
Use Scenario: DIN-rail mounted digital input/output expansion module interfacing with 24 V industrial field devices. IC Role / Device Role / Timing Role: Isolation-aware interface processor managing opto-coupled inputs, driving relay/SSR outputs, and reporting status via Modbus RTU over UART. Use Value: UART FIFO and NVIC prioritization ensure deterministic response to fast field-event edges without missed interrupts. | Use Scenario: Local operator panel with monochrome LCD, tactile buttons, and LED indicators for machine status display. IC Role / Device Role / Timing Role: Display controller sourcing parallel RGB or 8-bit interface, scanning keypad matrix, and updating LEDs via GPIO bit-banding writes. Use Value: Bit-band aliasing on GPIO registers enables atomic single-bit updates - critical for glitch-free LED state transitions during interrupt service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S618-IQN50-C2T | Same core and package, but adds CAN controller and USB device interface - no additional flash/SRAM. | Required where industrial fieldbus (CANopen) or host-side USB enumeration is needed. | Select when CAN or USB connectivity is mandatory; otherwise LM3S811-IQN50-C2T offers lower cost and smaller BOM. |
| TM4C123GH6PM | Newer ARM Cortex-M4F core, 80 MHz, 256 KB flash, FPU, enhanced peripherals - larger 64-pin LQFP package. | Needed for floating-point math (e.g., FFT-based vibration analysis) or higher code footprint. | Choose TM4C123GH6PM for new designs requiring FPU or extended memory; LM3S811-IQN50-C2T remains viable for legacy maintenance or cost-sensitive volume production. |
Compared with LM3S618-IQN50-C2T and TM4C123GH6PM, the LM3S811-IQN50-C2T delivers optimal balance of real-time determinism, analog integration, and industrial temperature rating in a mature, pin-stable platform - ideal for cost-constrained, non-CAN, non-USB embedded control where software ecosystem continuity matters.
Availability
LM3S811-IQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and embedded HMI controllers requiring stable component supply and long-term lifecycle assurance.
Supply support for LM3S811-IQN50-C2T 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 leader focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and consumer markets since 1930.
The Stellaris LM3S series was TI's first ARM-based MCU family, engineered for deterministic real-time control in resource-constrained industrial systems - emphasizing low-latency interrupt response, integrated analog peripherals, and robust firmware update capability.
FAQ
What is the maximum operating frequency of the LM3S811-IQN50-C2T?
The LM3S811-IQN50-C2T operates at a maximum CPU clock frequency of 50 MHz, as specified in the Texas Instruments production datasheet DS-LM3S811-15852.2743. This frequency is achieved using the internal PLL with an external crystal or oscillator input, and all peripherals are fully functional at this rate. The LM3S811-IQN50-C2T maintains timing compliance across its full industrial temperature range (–40°C to +85°C).
Does the LM3S811-IQN50-C2T include an internal temperature sensor?
Yes, the LM3S811-IQN50-C2T integrates a factory-calibrated on-die temperature sensor accessible via ADC channel 13 (AIN13). It provides ±3°C accuracy over the –40°C to +85°C range and requires no external components. This sensor is explicitly documented in Section 10.3.7 of the LM3S811 datasheet and is supported by StellarisWare driver library functions for direct readout in the LM3S811-IQN50-C2T.
What communication interfaces are available on the LM3S811-IQN50-C2T?
The LM3S811-IQN50-C2T provides UART0, I²C0, SSI0, and SSI1 interfaces. UART0 supports FIFO, modem control, and IrDA encoding; I²C0 operates up to 400 kHz; and both SSI modules support Motorola SPI, TI synchronous serial, and Microwire protocols. No CAN, USB, or Ethernet interfaces are present - those appear only in higher-tier Stellaris variants like the LM3S618-IQN50-C2T.
Is the LM3S811-IQN50-C2T pin-compatible with other LM3S devices?
No, the LM3S811-IQN50-C2T is not universally pin-compatible across the LM3S family. While it shares the 100-pin LQFP (IQN) package with some variants (e.g., LM3S618), signal mapping differs significantly - especially for SSI, PWM, and analog pins. Pin compatibility is only confirmed between identical package variants within the same datasheet table; the LM3S811-IQN50-C2T has unique pin assignments documented in Section 16 of its datasheet.
What development tools support the LM3S811-IQN50-C2T?
The LM3S811-IQN50-C2T is supported by Texas Instruments' legacy StellarisWare Peripheral Driver Library, Code Composer Studio v5–v6, and IAR Embedded Workbench for ARM. Evaluation is enabled via the original Stellaris DK-LM3S811 development kit. Note that TI discontinued active toolchain updates after 2016, but all required binaries, headers, and examples for the LM3S811-IQN50-C2T remain publicly archived and fully functional.
LM3S811-IQN50-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- 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:
- I2C, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 3.6V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S811-IQN50-C2T FAQ
1.How can I place an order for LM3S811-IQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S811-IQN50-C2T 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 LM3S811-IQN50-C2T reliable?
The price and inventory of LM3S811-IQN50-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S811-IQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S811-IQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S811-IQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S811-IQN50-C2T?
LM3S811-IQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S811-IQN50-C2T 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 LM3S811-IQN50-C2T?
For technical support, including LM3S811-IQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S811-IQN50-C2T requirements.
6.How does Aetrix verify that LM3S811-IQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S811-IQN50-C2T 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 LM3S811-IQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S811-IQN50-C2T?
All LM3S811-IQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S811-IQN50-C2T, 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 LM3S811-IQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S811-IQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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