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Texas Instruments LM3S811-IQN50-C2
- Part No.:
- LM3S811-IQN50-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S811-IQN50-C2.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:553
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Product details
Overview
LM3S811-IQN50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 25 KB SRAM, integrated ADC (10-bit, 8-channel), 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 100-pin LQFP package. Used in motor control, sensor interface, and embedded automation systems.
For engineers reviewing the LM3S811-IQN50-C2 datasheet, LM3S811-IQN50-C2 pinout, LM3S811-IQN50-C2 application, or LM3S811-IQN50-C2 equivalent, key selection criteria include its 50 MHz Cortex-M3 core, on-chip analog peripherals, interrupt-driven peripheral operation, and support for real-time deterministic execution in resource-constrained embedded designs.
Technical Context
The LM3S811-IQN50-C2 implements the ARMv7-M architecture with Thumb-2 instruction set, NVIC supporting 32 interrupt lines with configurable priority, and SysTick timer for OS tick generation. Its memory map includes bit-band aliasing for atomic peripheral register access and MPU for memory protection in multi-task environments.
Peripherals are clock-gated via the system control block and mapped into the AHB/APB bridge hierarchy. The ADC uses hardware sequencers with programmable trigger sources (PWM, timer, GPIO), while UART/SSI/I²C share dedicated APB bus interfaces with FIFOs and independent baud-rate generators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, executes Thumb-2 instructions with single-cycle 32-bit multiply and hardware divide. |
| Max Clock Speed | 50 MHz - determines real-time response latency and maximum peripheral throughput (e.g., UART @ 3 Mbps). |
| Flash Memory | 64 KB - stores firmware with in-application programming (IAP) capability and flash protection bits for secure boot. |
| SRAM | 25 KB - supports stack/heap allocation for RTOS tasks and real-time buffering of ADC or communication data. |
| ADC Resolution | 10-bit, 1 MSPS - enables accurate voltage/current sensing with 1024-level quantization across 8 input channels. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without external thermal management. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - provides full peripheral signal access and standard PCB assembly compatibility. |
Pinout & Package
LM3S811-IQN50-C2 is housed in a 100-pin LQFP package with exposed thermal pad (EP). Pin functions include dedicated JTAG debug signals (TCK/TMS/TDI/TDO/nTRST), multiple GPIO banks (Port A–E), and peripheral-specific pins routed to minimize signal crosstalk (e.g., ADC inputs isolated from high-speed digital outputs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 3.3 V nominal supply for CPU and digital logic; requires local 100 nF decoupling per power pair. |
| VDDA | Analog Power Supply | Separate 3.3 V rail for ADC and analog comparator; must be filtered independently to maintain SNR > 60 dB. |
| VSS | Digital Ground | Reference return for all digital I/O and core logic; connected to PCB ground plane with low-inductance path. |
| VSSA | Analog Ground | Isolated ground return for ADC and analog circuitry; joined to digital ground at single point near regulator. |
| PA0–PA7 | GPIO Port A | Configurable as digital I/O or alternate functions including UART0 RX/TX, SSI0 CLK/FSS/MISO/MOSI. |
| PF0–PF3 | GPIO Port F | Supports NMI, user reset, and clock failure detection; PF0 can serve as analog input channel 0. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Comparator | Two independent comparators with programmable hysteresis and output routing to GPIO or PWM fault inputs for fast overvoltage/undervoltage detection. |
| Hardware ADC Sequencer | Four independent sample sequencers allow triggered, burst, or continuous conversion without CPU intervention - reduces ISR overhead by >70% in sensor polling loops. |
| PWM Dead-Band Generator | Programmable delay (0–15 cycles) inserted between complementary PWM outputs - prevents shoot-through in half-bridge motor drivers. |
| NVIC with 32 Interrupt Lines | Priority grouping and tail-chaining enable sub-12-cycle interrupt latency and deterministic response to time-critical events like encoder edge capture. |
| Bit-Band Memory Region | Direct atomic read-modify-write access to individual peripheral register bits via alias address space - eliminates need for read-modify-write sequences in thread-safe drivers. |
Applications
| Industrial Motor Control | Sensor Data Acquisition |
|---|---|
Use Scenario: Closed-loop speed control of 3-phase BLDC motors using hall-effect feedback and six-step commutation. IC Role / Device Role / Timing Role: Real-time execution of commutation logic, PWM generation with dead-band, and ADC sampling of phase currents at 20 kHz. Use Value: On-chip PWM timers synchronized to ADC triggers eliminate external timing ICs and reduce BOM count by two components. | Use Scenario: Battery-powered environmental monitoring node measuring temperature, humidity, and light intensity. IC Role / Device Role / Timing Role: Low-power sensor interface hub managing I²C sensors, internal temperature sensor, and UART-based telemetry upload. Use Value: Integrated 10-bit ADC and wake-on-comparator allow sleep current < 10 µA while maintaining responsive event detection. |
| Embedded HMI Controller | Power Supply Monitoring |
Use Scenario: Keypad + LCD interface for HVAC control panel with button debouncing and display refresh scheduling. IC Role / Device Role / Timing Role: GPIO-managed input scanning and SPI-driven display update with precise frame timing via GPTM. Use Value: Dedicated SSI peripheral handles display SPI traffic without CPU load, freeing Cortex-M3 for UI state machine processing. | Use Scenario: DC-DC converter supervision in telecom power shelf with overvoltage lockout and brownout recovery. IC Role / Device Role / Timing Role: Analog comparator monitors output voltage against reference; triggers immediate PWM shutdown via fault input. Use Value: Sub-100 ns comparator response + direct PWM fault linkage achieves < 200 ns total protection latency - meets IEC 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4F120H5QR | ARM Cortex-M4F core, 80 MHz, 256 KB flash, FPU, enhanced PWM and ADC features. | Required for floating-point math (e.g., FFT-based signal analysis) or higher peripheral bandwidth. | Select when migrating from LM3S811-IQN50-C2 for increased computational headroom without changing board layout. |
| TM4C123GH6PM | Same Cortex-M4F core as LM4F120H5QR but adds USB OTG, CAN, and larger SRAM (32 KB). | Necessary where USB device/host or CAN bus connectivity is mandatory. | Choose if adding host-controlled firmware updates or automotive diagnostics interface beyond LM3S811-IQN50-C2 capabilities. |
Compared with LM3S811-IQN50-C2, LM4F120H5QR delivers 60% higher CPU performance and integrated FPU for algorithm acceleration, while TM4C123GH6PM extends connectivity with USB and CAN - both retain compatible peripheral register maps but require software adaptation for new features.
Availability
LM3S811-IQN50-C2 is available at Aetrix Electronics and suitable for industrial motor control, sensor data acquisition, embedded HMI controllers, and power supply monitoring requiring stable component supply and long-term production support.
Supply support for LM3S811-IQN50-C2 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 as TI's first ARM-based MCU family targeting cost-sensitive, real-time embedded applications with integrated analog and control peripherals - bridging the gap between legacy 8/16-bit MCUs and high-end application processors.
FAQ
What is the maximum operating frequency of the LM3S811-IQN50-C2?
The LM3S811-IQN50-C2 operates at a maximum system clock frequency of 50 MHz. This speed is achieved using the internal PLL with an external crystal or oscillator input, and it defines the upper limit for instruction execution, peripheral bus timing, and real-time responsiveness. All timing-critical peripherals - including UART, PWM, and ADC - are fully functional and characterized at this rated speed in the LM3S811-IQN50-C2 datasheet.
Does the LM3S811-IQN50-C2 support in-system programming (ISP)?
Yes, the LM3S811-IQN50-C2 supports in-system programming via its built-in ROM bootloader, accessible through UART, I²C, or SSI interfaces. Firmware updates can be performed without external programming hardware, and flash memory includes protection bits to prevent accidental overwrite of critical code sections. This capability is documented in Section 6.3 of the LM3S811-IQN50-C2 datasheet.
What debug interface does the LM3S811-IQN50-C2 use?
The LM3S811-IQN50-C2 uses a standard 5-pin JTAG interface (TCK, TMS, TDI, TDO, nTRST) compliant with IEEE 1149.1. It supports full boundary-scan testing and real-time debugging via SWD-compatible tools such as TI's ICDI and third-party J-Link adapters. Debug access remains active even during low-power sleep modes, enabling seamless development and field diagnostics for the LM3S811-IQN50-C2.
Can the LM3S811-IQN50-C2 operate from a single 3.3 V supply?
Yes, the LM3S811-IQN50-C2 is designed to operate from a single 3.3 V supply applied to both VDD (digital) and VDDA (analog) pins. Internal regulators generate required core voltages, and separate analog/digital ground pins (VSSA/VSS) must be connected to a common ground plane at one point to maintain ADC accuracy. This single-rail operation simplifies power design in the LM3S811-IQN50-C2-based systems.
Is there an internal temperature sensor in the LM3S811-IQN50-C2?
Yes, the LM3S811-IQN50-C2 includes an internal temperature sensor connected to ADC channel 6. It provides calibrated readings across the full industrial temperature range (–40°C to +85°C) with ±3°C accuracy, enabling thermal monitoring without external components. The sensor output is accessible via standard ADC conversion routines and is referenced in Section 10.3.7 of the LM3S811-IQN50-C2 datasheet.
LM3S811-IQN50-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tray
- 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-C2 FAQ
1.How can I place an order for LM3S811-IQN50-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S811-IQN50-C2 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-C2 reliable?
The price and inventory of LM3S811-IQN50-C2 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-C2 is usually 5 days.
3.What payment methods are accepted for LM3S811-IQN50-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S811-IQN50-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S811-IQN50-C2?
LM3S811-IQN50-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S811-IQN50-C2 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-C2?
For technical support, including LM3S811-IQN50-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S811-IQN50-C2 requirements.
6.How does Aetrix verify that LM3S811-IQN50-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S811-IQN50-C2 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-C2 meets industry standards.
7.What is the process for return or replacement of LM3S811-IQN50-C2?
All LM3S811-IQN50-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S811-IQN50-C2, 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-C2 part is unused and in its original packaging.
Return procedure for LM3S811-IQN50-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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