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Texas Instruments LM3S811-EQN50-C2T
- Part No.:
- LM3S811-EQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S811-EQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,690
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Product details
Overview
LM3S811-EQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 8 KB SRAM, and integrated ADC, UART, I²C, SSI, PWM, and analog comparator. It operates at up to 50 MHz and supports industrial temperature range (–40°C to +85°C) in a 50-pin QFP package. It targets real-time control applications such as motor drive monitoring and sensor-based embedded systems.
For engineers reviewing the LM3S811-EQN50-C2T datasheet, LM3S811-EQN50-C2T pinout, LM3S811-EQN50-C2T application, or LM3S811-EQN50-C2T equivalent, key selection criteria include its 50 MHz Cortex-M3 core, on-chip 64 KB flash/8 KB SRAM, 8-channel 10-bit ADC, dual UARTs, and QFP-50 thermal performance for space-constrained industrial control designs.
Technical Context
The LM3S811-EQN50-C2T implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. Its peripheral set includes two UARTs (one with IrDA support), one I²C master/slave interface, one SSI port, and a 16-channel GPIO bank with programmable slew rate and pull-up/pull-down.
It integrates a 10-bit 8-channel ADC with hardware averaging and internal temperature sensor, plus a 6-channel PWM module with dead-band generation and fault protection-enabling closed-loop motor control without external timing ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic interrupt latency & real-time task scheduling |
| Flash Memory | 64 KB on-chip flash with 128-bit wide interface - sufficient for firmware + bootloader with field-upgrade capability |
| SRAM | 8 KB on-chip SRAM - supports stack, heap, and real-time data buffers for control loops |
| ADC | 10-bit, 8-channel SAR ADC with 1 MSPS sample rate and hardware averaging - suitable for precision sensor signal acquisition |
| Timers | Four 16/32-bit GPTMs (two 32-bit capable), one watchdog, one SysTick - provides flexible timebase, PWM, and safety supervision |
| Communication | Two UARTs (one with IrDA), one I²C, one SSI - supports serial sensor networks, display interfaces, and EEPROM communication |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating or external thermal management |
| Package | 50-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) - compatible with standard reflow processes and manual inspection |
Pinout & Package
LM3S811-EQN50-C2T is housed in a 50-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, JEDEC MS-026AC compliant. Pin layout supports full peripheral mapping including dual UARTs, I²C, SSI, ADC inputs, PWM outputs, and GPIO with alternate functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital (VDD), analog (VDDA), and core (VDDC) rails require separate 3.3 V filtering - critical for ADC accuracy and core stability |
| GND, GNDA, GNDC | Ground returns | Analog (GNDA) and core (GNDC) grounds must be star-connected near chip to minimize noise coupling into ADC and PLL |
| PD0–PD7, PE0–PE5, PF0–PF4 | GPIO banks | 16 total GPIO pins with configurable pull-up/down, slew rate, and 5-V tolerant inputs on select pins - usable for status LEDs, buttons, or level translation |
| PA0–PA7, PB0–PB7 | Peripheral function pins | Map to UART0/1, I²C0, SSI0, ADC0, PWM0/1 - require correct muxing via GPIOAFSEL and GPIODEN registers |
| OSC0, OSC1 | Clock input terminals | Accept 1–25 MHz crystal or external clock - feeds PLL to generate 50 MHz system clock; bypass mode supported |
| nRST | Active-low reset input | Asynchronous reset with internal pull-up; debounced externally recommended for robust power-on sequencing |
Key Features
| Feature | Design Value |
|---|---|
| ARM Cortex-M3 core with NVIC | Hardware-integrated nested vectored interrupt controller enables sub-12-cycle interrupt latency - essential for fast-response motor control |
| On-chip memory protection unit (MPU) | Configurable memory regions prevent accidental code/data corruption - improves firmware reliability in multi-tasking environments |
| Integrated analog comparator | Two independent comparators with selectable reference sources - eliminates need for external comparators in overvoltage/undervoltage detection |
| PWM with dead-band generation | 6-channel PWM with programmable dead-time insertion - prevents shoot-through in H-bridge gate drive applications |
| Internal temperature sensor | Calibrated ±3°C accuracy across –40°C to +85°C - enables thermal monitoring without external sensors |
| IrDA-capable UART0 | Supports 115.2 kbps IrDA physical layer encoding - allows contactless configuration and diagnostics in sealed enclosures |
Applications
| Industrial Motor Monitoring | Smart Sensor Node |
|---|---|
Use Scenario: Real-time current/voltage sampling and thermal monitoring of BLDC motor drives in HVAC blowers. IC Role / Device Role / Timing Role: Central controller executing FOC algorithms, managing PWM timing, and communicating fault status via UART. Use Value: On-chip 10-bit ADC with hardware averaging delivers stable current measurement; 50 MHz core ensures <10 µs loop update time. | Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and air quality with local decision logic. IC Role / Device Role / Timing Role: System-on-chip host managing sensor interfaces (I²C/SSI), ADC acquisition, low-power sleep scheduling, and UART logging. Use Value: Integrated temperature sensor and ultra-low-power sleep modes (<2 µA deep-sleep) extend battery life beyond 2 years. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Instrument Front-End |
Use Scenario: DIN-rail mounted I/O expansion module converting discrete inputs to Modbus RTU over RS-485. IC Role / Device Role / Timing Role: Protocol processor handling UART-to-Modbus framing, GPIO scanning, and watchdog supervision. Use Value: Dual UARTs allow simultaneous host interface and RS-485 transceiver control; industrial temp grade ensures operation in factory cabinets. | Use Scenario: Portable blood glucose meter requiring precise analog front-end, button interface, and USB-like serial diagnostics. IC Role / Device Role / Timing Role: Mixed-signal controller acquiring electrochemical sensor signals, managing user interface, and transmitting results via UART to host PC. Use Value: 10-bit ADC with internal reference and analog comparator enable accurate strip reading; QFP-50 footprint fits compact handheld form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S811-IQN50-C2 | Same silicon, commercial temp grade (–40°C to +85°C vs. industrial), identical pinout and peripherals | Qualified for non-industrial ambient conditions; lacks extended qualification testing per AEC-Q100 or IEC 61000-4-x | Select when cost sensitivity outweighs need for full industrial qualification documentation |
| TM4C123GH6PM | Successor family: Cortex-M4F core, 80 MHz, 256 KB flash, 32 KB SRAM, enhanced ADC/PWM, same QFP-64 package | Higher performance and memory; requires PCB redesign due to 64-pin footprint and different pin mapping | Choose for new designs needing floating-point math, larger code space, or future-proofing - not drop-in replacement |
Compared with LM3S811-EQN50-C2T, LM3S811-IQN50-C2 offers identical functionality at lower qualification cost, while TM4C123GH6PM delivers significant performance uplift but mandates layout revision and firmware adaptation.
Availability
LM3S811-EQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and medical diagnostic instrument front-ends requiring stable component supply and long-term lifecycle support.
Supply support for LM3S811-EQN50-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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive microcontrollers.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications demanding ARM Cortex-M3 performance in small-footprint packages - targeting motor control, sensor interfacing, and industrial automation.
FAQ
What is the maximum operating frequency of the LM3S811-EQN50-C2T?
The LM3S811-EQN50-C2T operates at a maximum system clock frequency of 50 MHz, achieved via its on-chip PLL that multiplies an external 1–25 MHz crystal or oscillator input. This frequency is fully supported across the full industrial temperature range (–40°C to +85°C) and is specified in the production datasheet DS-LM3S811-15852.2743. The LM3S811-EQN50-C2T maintains timing compliance without derating under worst-case voltage and temperature conditions.
Does the LM3S811-EQN50-C2T support in-circuit debugging?
Yes, the LM3S811-EQN50-C2T includes a JTAG-DP debug port compliant with IEEE 1149.1, supporting full boundary-scan, flash programming, and real-time debugging via TI's ICDI or third-party JTAG adapters. The LM3S811-EQN50-C2T debug interface is accessible through dedicated TCK, TMS, TDI, TDO, and nTRST pins, and supports SWD mode via software configuration. No external debug probe is required for basic flash loading and breakpoint debugging.
What are the ADC capabilities of the LM3S811-EQN50-C2T?
The LM3S811-EQN50-C2T integrates a single 10-bit successive approximation register (SAR) ADC with eight input channels, 1 MSPS maximum sample rate, and hardware-supported averaging across 2–64 samples. It includes an internal temperature sensor and supports differential input mode on selected channels. The LM3S811-EQN50-C2T ADC uses a dedicated VDDA/GNDA supply and internal reference, delivering ±1 LSB INL/DNL performance per the production datasheet.
Is the LM3S811-EQN50-C2T pin-compatible with other Stellaris devices?
No, the LM3S811-EQN50-C2T is not pin-compatible with other Stellaris family members beyond the LM3S811 variant group (e.g., LM3S811-IQN50-C2). While it shares the same 50-pin QFP package with identical mechanical footprint, pin functions differ significantly from LM3S101, LM3S102, or TM4C123x devices. The LM3S811-EQN50-C2T pin mapping is unique to its peripheral set and documented in Section 16 (Pin Diagram) and Section 17 (Signal Tables) of its datasheet.
What power supply requirements does the LM3S811-EQN50-C2T have?
The LM3S811-EQN50-C2T requires three independent 3.3 V supplies: VDD (digital I/O), VDDA (analog), and VDDC (core), each with local 0.1 µF + 4.7 µF decoupling. VDDA and VDDC must be within ±3% of 3.3 V; VDD tolerance is ±5%. The LM3S811-EQN50-C2T draws 12 mA typical at 50 MHz with all peripherals active, and less than 2 µA in deep-sleep mode. External regulators must meet transient response specs per Section 5.2.3 of the datasheet.
LM3S811-EQN50-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:
- Obsolete
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S811-EQN50-C2T FAQ
1.How can I place an order for LM3S811-EQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S811-EQN50-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-EQN50-C2T reliable?
The price and inventory of LM3S811-EQN50-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-EQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S811-EQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S811-EQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S811-EQN50-C2T?
LM3S811-EQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S811-EQN50-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-EQN50-C2T?
For technical support, including LM3S811-EQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S811-EQN50-C2T requirements.
6.How does Aetrix verify that LM3S811-EQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S811-EQN50-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-EQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S811-EQN50-C2T?
All LM3S811-EQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S811-EQN50-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-EQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S811-EQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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