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Texas Instruments LM3S818-IQN50-C2T
- Part No.:
- LM3S818-IQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S818-IQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
LM3S818-IQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (10-bit, 8-channel), dual UARTs, SSI, I²C, PWM, QEI, 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, industrial automation, and embedded HMI systems.
For engineers reviewing the LM3S818-IQN50-C2T datasheet, LM3S818-IQN50-C2T pinout, LM3S818-IQN50-C2T application, or LM3S818-IQN50-C2T equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and confirmed alternative parts for design-in and BOM continuity planning.
Technical Context
The LM3S818-IQN50-C2T implements the ARM Cortex-M3 core with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It integrates on-chip clocking with PLL-based system clock generation up to 50 MHz and supports multiple low-power sleep modes with wake-up via GPIO, timer, or peripheral interrupt.
Peripherals include two UARTs with FIFOs and modem control signals, one SSI supporting master/slave SPI modes, one I²C controller, eight-channel 10-bit ADC with hardware averaging and temperature sensor input, four general-purpose timers (two 32-bit, two 16-bit), six PWM outputs with dead-band generation, and quadrature encoder interface for position/speed feedback in motion control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 50 MHz max operation |
| Memory | 64 KB on-chip flash (programmable/erasable in blocks), 24 KB SRAM (zero-wait-state) |
| ADC | 10-bit SAR ADC, 8 single-ended or 4 differential channels, 1 MSPS sample rate, internal temp sensor |
| Timers | Four GPTMs: two 32-bit or four 16-bit; supports one-shot, periodic, RTC, PWM, capture, and quadrature modes |
| Communication | 2× UART (with FIFO, modem control), 1× SSI (SPI master/slave), 1× I²C (standard/fast mode) |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, industrial temperature grade |
| Supply Voltage | 2.25 V to 3.63 V VDD; on-chip LDO regulator supplies core voltage (1.2 V) from main supply |
Pinout & Package
LM3S818-IQN50-C2T is housed in a 100-pin LQFP package with exposed thermal pad (EP). Pin functions are defined per TI SPMS161I datasheet Rev I, including dedicated JTAG/SWD debug pins (TCK, TMS, TDI, TDO, nSRST), power/ground distribution across multiple VDD/VSS pairs, and multiplexed peripheral signals assigned to specific GPIO ports (Port A–E).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| nSRST | Reset Input | Active-low asynchronous reset; asserts internal POR and resets all peripherals and CPU state |
| TCK | JTAG Clock | Provides clock for JTAG boundary-scan and debug operations; requires external pull-up |
| PA0–PA7 | GPIO Port A | Configurable digital I/O; PA0–PA3 support UART0, SSI0, I²C0, and PWM0 alternate functions |
| PB0–PB7 | GPIO Port B | Supports UART1, QEI0, PWM1, and ADC0 inputs; PB4–PB7 configurable as analog inputs |
| VDDA/VSSA | Analog Supply | Dedicated 2.25–3.63 V analog power and ground pins for ADC and comparator reference stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Subsystem | On-die 10-bit ADC with hardware averaging, internal temperature sensor, and analog comparator with programmable reference |
| Motion Control Peripherals | Quadrature Encoder Interface (QEI) and six-channel PWM with dead-band generator for BLDC/PMSM motor drive |
| Real-Time Determinism | NVIC with 32 interrupt lines, configurable priority grouping, and sub-12-cycle interrupt latency for time-critical tasks |
| Low-Power Operation | Five sleep modes (sleep/deep-sleep/power-down); wake-up from GPIO, timer, or peripheral event with <1 µs latency |
| Secure Boot Support | Flash lock bits and write-protection enable firmware integrity enforcement and prevent unauthorized code execution |
Applications
| Industrial Motor Control | Embedded Human-Machine Interface |
|---|---|
Use Scenario: Closed-loop speed/position control of brushless DC motors in HVAC blowers and conveyor systems. IC Role / Device Role / Timing Role: Central controller executing FOC algorithms, managing PWM timing, reading QEI feedback, and processing ADC current/voltage samples. Use Value: Integrated QEI, six PWM outputs with dead-band, and 10-bit ADC enable precise torque/speed regulation without external timing ICs or signal conditioners. | Use Scenario: Local operator panel with keypad, LED indicators, and serial display interface in factory equipment. IC Role / Device Role / Timing Role: Main MCU handling button debouncing, LED sequencing, UART communication to display module, and real-time status logging. Use Value: Dual UARTs support simultaneous host diagnostics and display interface; 24 KB SRAM buffers UI state and command history without external memory. |
| Programmable Logic Controller (PLC) I/O Module | Energy Monitoring Gateway |
Use Scenario: DIN-rail mounted remote I/O node collecting digital inputs, analog sensor data, and driving relay outputs in distributed control systems. IC Role / Device Role / Timing Role: Real-time I/O processor with deterministic scan cycle, ADC sampling, and isolated digital output control via GPIO. Use Value: Eight ADC channels and 40+ GPIOs allow direct connection to sensors/actuators; on-chip LDO simplifies power design for isolated 24 V input rails. | Use Scenario: Smart metering node aggregating current/voltage measurements from CTs and PTs for building-level energy analytics. IC Role / Device Role / Timing Role: Data acquisition engine performing synchronized sampling, RMS calculation, and Modbus RTU transmission over RS-485. Use Value: Hardware-averaged ADC samples reduce CPU load; UART with automatic flow control ensures reliable Modbus packet delivery under noisy EMI conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQN50-C2T | Same core and package; adds Ethernet MAC + PHY interface and increases flash to 256 KB | Requires Ethernet connectivity; higher BOM cost and PCB complexity due to magnetics and layout constraints | Select when networked device management or remote firmware updates are required |
| TM4C123GH6PM | Successor family; Cortex-M4F core, 80 MHz, FPU, 256 KB flash, 32 KB SRAM, enhanced peripherals | Higher performance and precision math capability; not pin-compatible; requires PCB redesign and firmware porting | Select for new designs needing floating-point computation or extended memory; not drop-in replacement |
Compared with LM3S818-IQN50-C2T, LM3S8962-IQN50-C2T adds Ethernet but retains pinout and software compatibility, while TM4C123GH6PM offers superior compute capability and memory but demands full hardware and firmware revalidation.
Availability
LM3S818-IQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, embedded HMI, PLC I/O modules, and energy monitoring gateways requiring stable component supply and long-term production support.
Supply support for LM3S818-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 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 integrated analog, motor control, and communication peripherals in a single-chip solution.
FAQ
What is the maximum operating frequency of the LM3S818-IQN50-C2T?
The LM3S818-IQN50-C2T operates at a maximum system clock frequency of 50 MHz, achieved using its internal PLL with an external crystal or oscillator input. This frequency applies across the full industrial temperature range (–40°C to +85°C) and is specified under recommended DC operating conditions (2.25 V to 3.63 V VDD). The LM3S818-IQN50-C2T maintains timing compliance without derating at rated voltage and temperature.
Does the LM3S818-IQN50-C2T support in-circuit debugging?
Yes, the LM3S818-IQN50-C2T supports JTAG and SWD debugging interfaces via dedicated pins (TCK, TMS, TDI, TDO, nSRST). It includes an integrated debug module compliant with ARM CoreSight standards, enabling breakpoints, watchpoints, register inspection, and flash programming. The LM3S818-IQN50-C2T is fully supported by TI's Code Composer Studio and third-party tools like Keil MDK and IAR Embedded Workbench.
What analog features are integrated into the LM3S818-IQN50-C2T?
The LM3S818-IQN50-C2T integrates an 8-channel, 10-bit SAR ADC with hardware averaging, a single analog comparator with programmable reference voltage, and an internal temperature sensor connected to ADC channel 6. All analog functions share a common VDDA/VSSA supply domain to minimize noise coupling. The LM3S818-IQN50-C2T does not include DAC or op-amps - analog output requires external circuitry or PWM-based filtering.
Is the LM3S818-IQN50-C2T pin-compatible with other Stellaris devices?
The LM3S818-IQN50-C2T is pin-compatible within the LM3S8xx family sharing the 100-pin LQFP package (e.g., LM3S811, LM3S815, LM3S8962), but not with devices in different packages or pin counts. Signal mapping and peripheral availability vary between variants - for example, LM3S8962 adds Ethernet pins not present on LM3S818-IQN50-C2T. Always verify pin function tables in the SPMS161I datasheet before substitution.
What is the flash endurance and data retention specification for the LM3S818-IQN50-C2T?
The LM3S818-IQN50-C2T specifies 100,000 erase/write cycles per flash sector and 20-year data retention at 85°C ambient temperature. Flash sectors can be erased individually (1 KB or 4 KB), and program/erase operations are controlled via the Flash Memory Controller registers. The LM3S818-IQN50-C2T supports secure locking of flash pages to prevent unauthorized readout or modification during field deployment.
LM3S818-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:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 30
- 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 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S818-IQN50-C2T FAQ
1.How can I place an order for LM3S818-IQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-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 LM3S818-IQN50-C2T reliable?
The price and inventory of LM3S818-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 LM3S818-IQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S818-IQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-IQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-IQN50-C2T?
LM3S818-IQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-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 LM3S818-IQN50-C2T?
For technical support, including LM3S818-IQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-IQN50-C2T requirements.
6.How does Aetrix verify that LM3S818-IQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S818-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 LM3S818-IQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S818-IQN50-C2T?
All LM3S818-IQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-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 LM3S818-IQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S818-IQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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