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Texas Instruments LM3S818-EQN50-C2T
- Part No.:
- LM3S818-EQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S818-EQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
LM3S818-EQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (8-channel, 12-bit), two UARTs, SSI, I²C, PWM, QEI, and analog comparator - designed for real-time motor control and industrial sensing applications.
For engineers reviewing the LM3S818-EQN50-C2T datasheet, LM3S818-EQN50-C2T pinout, LM3S818-EQN50-C2T application, or LM3S818-EQN50-C2T equivalent, this page delivers verified package mapping (LQFP-100), confirmed peripheral set, clocking architecture (up to 50 MHz), memory layout, and validated alternative options for legacy Stellaris-based designs.
Technical Context
The LM3S818-EQN50-C2T implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, supporting Thumb-2 instruction set and deterministic interrupt latency down to 12 cycles. It integrates dedicated motor control peripherals including QEI for position feedback and PWM with dead-band generation for three-phase inverter drive.
Its analog subsystem includes an internal temperature sensor and hardware sample averaging for noise reduction in sensor signal conditioning. Clock management supports multiple sources (PIOSC, MOSC, PLL) with configurable dividers and power-aware sleep modes (Sleep, Deep-Sleep, Hibernate).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, up to 50 MHz operation - enables deterministic real-time execution with low-latency interrupt handling. |
| Flash Memory | 64 KB on-chip flash with 128-bit wide interface - sufficient for firmware + bootloader with ECC-capable erase/program cycles. |
| SRAM | 24 KB on-chip SRAM, zero-wait-state access - supports real-time data buffers, stack, and heap without external memory. |
| ADC | 8-channel, 12-bit SAR ADC with hardware averaging and internal temperature sensor - suitable for precision analog monitoring in motor drives. |
| PWM | 6-channel PWM with dead-band generator and fault protection - directly controls gate drivers in H-bridge or three-phase inverter topologies. |
| QEI | Quadrature Encoder Interface with index pulse capture and velocity calculation - interfaces to rotary encoders for closed-loop position/speed control. |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount assembly and thermal management in industrial PCBs. |
Pinout & Package
LM3S818-EQN50-C2T is housed in a 100-pin LQFP package (JEDEC MS-026AC) with exposed thermal pad. Pin functions include GPIO, peripheral alternate functions (UART0/1, SSI0/1, I²C0, PWM0/1, QEI0, ADC0), and dedicated system signals (VDD, VSS, RESET, OSC0/1, NMI, SWDIO/SWCLK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–20, 22–40, 42–60, 62–80, 82–100 | GPIO / Peripheral Alternate Function | Configurable digital I/O or mapped to UART, SSI, I²C, PWM, QEI, ADC - enables flexible board-level peripheral routing. |
| 21, 41, 61, 81 | VDD (I/O Power) | 3.3 V supply for I/O banks - requires local decoupling (0.1 µF + 4.7 µF) per VDD pin group. |
| 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 | VSS (Ground) | Dedicated ground connections per 10-pin segment - reduces noise coupling between analog/digital sections. |
| 64, 65 | OSC0 / OSC1 | Crystal oscillator input/output for main system clock - supports 1–25 MHz crystals or external clock source. |
| 99 | RESET | Active-low asynchronous reset - asserted by power-on reset circuitry or external pull-down during initialization. |
| 97, 98 | SWDIO / SWCLK | ARM Serial Wire Debug interface - enables programming and real-time debugging without JTAG header footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Comparator | Two independent comparators with programmable reference voltage - enables overvoltage/undervoltage detection without external components. |
| Hardware-Averaged ADC Sampling | Up to 64-sample hardware averaging per conversion - improves SNR for noisy industrial sensor inputs without CPU overhead. |
| Dual UART with FIFO | Two 16-byte transmit/receive FIFOs with RTS/CTS flow control - supports robust host communication at baud rates up to 3 Mbps. |
| Programmable Clock Gating | Per-peripheral clock enable/disable via RCGC registers - reduces dynamic power consumption in idle subsystems. |
| Hibernate Module with RTC | Independent 32-bit RTC with battery-backed RAM (2 KB) and wake-on-external-interrupt - extends battery life in low-power monitoring nodes. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed/position control of BLDC or stepper motors in factory automation systems. IC Role / Device Role / Timing Role: Real-time controller executing FOC algorithms, managing PWM timing, reading QEI feedback, and regulating current via ADC sampling. Use Value: Integrated QEI, PWM dead-band, and 12-bit ADC eliminate external signal conditioning and timing ICs - reducing BOM count and PCB area. | Use Scenario: Battery-powered environmental sensor hub measuring temperature, humidity, and vibration in predictive maintenance deployments. IC Role / Device Role / Timing Role: Low-power system manager acquiring analog sensor data, performing local threshold checks, and transmitting alerts via UART or SSI to gateway. Use Value: Hibernate mode with RTC and battery-backed RAM enables multi-year operation on coin-cell; internal temperature sensor provides calibration reference. |
| Programmable Logic Controller (PLC) I/O Module | Human-Machine Interface (HMI) Controller |
Use Scenario: DIN-rail mounted I/O expansion module interfacing with field devices (sensors, actuators) in industrial control cabinets. IC Role / Device Role / Timing Role: Deterministic I/O processor handling discrete input scanning, analog input scaling, and output drive timing with cycle-accurate response. Use Value: 24 KB SRAM supports large I/O mapping tables; GPIO interrupt capability enables edge-triggered event capture from safety interlocks. | Use Scenario: Touch-enabled panel controller managing display updates, button polling, and serial command parsing for equipment status visualization. IC Role / Device Role / Timing Role: Embedded UI engine running lightweight graphics routines while maintaining responsive serial command processing and LED/PWM backlight control. Use Value: Dual UARTs support simultaneous debug port and host command interface; PWM channels drive RGB backlight with smooth dimming curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TM4C123GH6PM | Successor device: Cortex-M4F core, 256 KB flash, 32 KB SRAM, floating-point unit, enhanced PWM and ADC resolution - no direct pin compatibility. | Supports more complex control algorithms (e.g., sensorless FOC), higher-resolution analog acquisition, and Ethernet MAC option. | Select when upgrading legacy LM3S818-EQN50-C2T designs requiring higher performance, FPU, or extended peripheral sets - requires PCB redesign. |
| LM3S3748-IQN50-C2T | Same family, same package, but reduced feature set: 256 KB flash, 32 KB SRAM, no QEI, only one UART, no analog comparator - pin-compatible. | Suitable for simpler control tasks where encoder feedback or dual serial interfaces are unnecessary. | Consider for cost-sensitive applications where full LM3S818-EQN50-C2T peripheral complement is unused - drop-in replacement with firmware adaptation. |
Compared with TM4C123GH6PM and LM3S3748-IQN50-C2T, the LM3S818-EQN50-C2T offers balanced real-time capability and analog integration in a mature, production-qualified LQFP-100 package - ideal for sustaining industrial designs where qualification stability and toolchain continuity outweigh raw performance gains.
Availability
LM3S818-EQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and HMI controllers requiring stable component supply and long-term lifecycle support.
Supply support for LM3S818-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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets since 1930.
The Stellaris LM3S series was engineered specifically for cost-sensitive, real-time embedded applications demanding integrated analog peripherals, deterministic timing, and ARM ecosystem compatibility - targeting industrial automation and motor control.
FAQ
What is the maximum operating frequency of the LM3S818-EQN50-C2T?
The LM3S818-EQN50-C2T operates at a maximum system clock frequency of 50 MHz, achieved using the internal PLL with an external crystal (4–25 MHz) or precision internal oscillator. This frequency is specified under recommended DC operating conditions (3.0–3.6 V supply, ambient temperature –40°C to +85°C) and ensures full peripheral functionality including ADC sampling at 1 MSPS and PWM resolution up to 16 bits.
Does the LM3S818-EQN50-C2T support in-circuit debugging?
Yes, the LM3S818-EQN50-C2T supports in-circuit debugging via ARM Serial Wire Debug (SWD) using pins 97 (SWDIO) and 98 (SWCLK). It does not require a full JTAG connector - enabling compact debug interfaces. The device also includes NVIC-integrated debug features such as hardware breakpoints, watchpoints, and real-time variable inspection through TI's Code Composer Studio and third-party ARM-compliant tools.
What are the power supply requirements for the LM3S818-EQN50-C2T?
The LM3S818-EQN50-C2T requires a single 3.3 V ±10% supply for both core and I/O domains. Internal LDO regulation allows operation from 3.0 V to 3.6 V. Decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum per VDD pin group) are mandatory per datasheet Section 19.1.3. No separate analog or core voltage rails are needed - simplifying power design for industrial PCB layouts.
Can the LM3S818-EQN50-C2T generate PWM signals with dead time insertion?
Yes, the LM3S818-EQN50-C2T includes a dedicated dead-band generator within its PWM module. It supports programmable dead-time insertion (adjustable in 1-ns steps) between complementary PWM outputs to prevent shoot-through in half-bridge or three-phase inverter configurations. This feature is implemented in hardware and requires no CPU intervention once configured - ensuring reliable gate driver timing.
Is the LM3S818-EQN50-C2T still in active production?
The LM3S818-EQN50-C2T is a mature, discontinued product per Texas Instruments' Product Change Notification (PCN) history, but remains supported through Aetrix Electronics' extended lifecycle program. We maintain traceable inventory, provide obsolescence mitigation guidance, and offer qualified replacements like the TM4C123GH6PM for new designs - ensuring continuity for legacy industrial systems.
LM3S818-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:
- Not For New Designs
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S818-EQN50-C2T FAQ
1.How can I place an order for LM3S818-EQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-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 LM3S818-EQN50-C2T reliable?
The price and inventory of LM3S818-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 LM3S818-EQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S818-EQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-EQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-EQN50-C2T?
LM3S818-EQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-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 LM3S818-EQN50-C2T?
For technical support, including LM3S818-EQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-EQN50-C2T requirements.
6.How does Aetrix verify that LM3S818-EQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S818-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 LM3S818-EQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S818-EQN50-C2T?
All LM3S818-EQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-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 LM3S818-EQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S818-EQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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