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Texas Instruments LM3S818-EQN50-C2
- Part No.:
- LM3S818-EQN50-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S818-EQN50-C2.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,625
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Product details
Overview
LM3S818-EQN50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, and integrated peripherals including UART, SSI, PWM, ADC (8-channel, 12-bit), 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-EQN50-C2 datasheet, LM3S818-EQN50-C2 pinout, LM3S818-EQN50-C2 application, or LM3S818-EQN50-C2 equivalent, key selection criteria include its 50 MHz CPU clock, on-chip LDO regulator, 100-pin LQFP footprint, integrated QEI for position sensing, and support for real-time motor control loops without external timing ICs.
Technical Context
The LM3S818-EQN50-C2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU, enabling deterministic interrupt response and memory protection. It integrates a 12-bit ADC with hardware averaging and four sample sequencers, plus dual PWM modules with dead-band generation and fault protection logic for three-phase motor drive.
Its system-level design includes an on-chip 1.8 V LDO regulator supplying core voltage, configurable GPIO with slew-rate control and weak pull-ups/pull-downs, and multiple clock sources (PIOSC, MOSC, PLL) supporting dynamic power management across Sleep, Deep-Sleep, and Hibernate modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 64 KB on-chip flash with 128-bit wide interface and single-cycle access at 50 MHz |
| SRAM | 24 KB on-chip SRAM, zero-wait-state operation, accessible by CPU and DMA |
| ADC | 8-channel, 12-bit SAR ADC with 1 MSPS sampling rate and hardware averaging up to 64 samples |
| PWM | 6-channel PWM with 2 independent modules, dead-band insertion, fault shutdown, and sync capability |
| QEI | Dual quadrature encoder interface supporting index pulse, velocity capture, and direction detection |
| Operating Temp | –40°C to +85°C industrial grade; validated across full range with internal temperature sensor |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, lead-free |
Pinout & Package
LM3S818-EQN50-C2 is housed in a 100-pin LQFP package with exposed thermal pad. Pin assignments are defined per TI SPMS161I datasheet Section 16 (Pin Diagram) and Section 17 (Signal Tables). All I/O pins support 5-V tolerant inputs and programmable drive strength.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 1.8 V input to internal LDO; must be decoupled with 1 µF ceramic capacitor near pin |
| VDDA | Analog Power Supply | Separate 3.3 V analog rail; isolated from digital VDD to reduce noise coupling into ADC |
| GND | Digital Ground | Common reference for all digital I/O and core logic; connected to thermal pad |
| GPIO_A0–A7 | General-Purpose I/O | Port A pins support UART0, SSI0, PWM0, and QEI0 alternate functions; individually configurable |
| PH0–PH7 | High-Drive GPIO | Port H pins provide 8 mA drive strength and support USB D+ and D− signaling |
| USB0_VBUS | USB Detection Input | Monitors host VBUS presence; enables USB device mode when high (5 V) |
| RTCCLK | Real-Time Clock Input | Accepts external 32.768 kHz crystal or oscillator signal for low-power timekeeping |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO Regulator | On-chip 1.8 V regulator eliminates need for external core supply, reducing BOM count and layout complexity |
| Hardware-Accelerated QEI | Dedicated QEI peripheral captures position, direction, and velocity without CPU intervention, freeing cycles for control algorithms |
| Programmable GPIO Slew Rate | Configurable edge rate per pin reduces EMI in noisy industrial environments and prevents signal integrity issues |
| Dual PWM Modules with Fault Protection | Independent PWM blocks with configurable fault inputs enable safe shutdown of motor drives during overcurrent or thermal events |
| Internal Temperature Sensor | Calibrated on-die sensor provides ±3°C accuracy over –40°C to +85°C for thermal monitoring without external components |
Applications
| Industrial Motor Control | Embedded HMI Panel |
|---|---|
Use Scenario: Closed-loop control of BLDC or stepper motors in factory automation equipment. IC Role / Device Role / Timing Role: Central controller executing FOC or trapezoidal commutation, managing PWM outputs, reading QEI feedback, and processing ADC current/voltage samples. Use Value: Integrated QEI, dual PWM with dead-band, and 12-bit ADC eliminate external timing and signal-conditioning ICs, reducing board area and component count. | Use Scenario: Touch-enabled operator interface with local display, button inputs, and serial communication to PLC. IC Role / Device Role / Timing Role: Main processor handling GUI rendering, touch scan, UART/SSI comms, and real-time status updates via GPIO-driven LEDs and buzzers. Use Value: 24 KB SRAM supports frame buffer storage; 100-pin LQFP provides ample I/O for parallel LCD interface and capacitive touch controller integration. |
| Smart Sensor Node | Power Supply Monitor |
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and vibration data for wireless transmission. IC Role / Device Role / Timing Role: Data acquisition hub using ADC, internal temperature sensor, and UART/SSI to interface with transceivers; manages low-power sleep states. Use Value: Hibernate mode draws < 2 µA; internal LDO allows direct battery connection (3.3 V); calibrated temperature sensor avoids external IC calibration overhead. | Use Scenario: Monitoring input/output voltages, current, and thermal status in AC/DC power supplies and UPS systems. IC Role / Device Role / Timing Role: Real-time supervisor detecting overvoltage, undervoltage, overtemperature, and fault conditions; triggers PWM shutdown or relay control. Use Value: Analog comparator with programmable reference enables fast (< 100 ns) fault response; ADC channels monitor multiple rails simultaneously with hardware averaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Tiva C TM4C123GH6PM | Successor part with Cortex-M4F core, 80 MHz, 256 KB flash, FPU, and enhanced peripheral set; not pin-compatible | Supports floating-point math-intensive control algorithms and Ethernet MAC; requires PCB redesign | Select when upgrading legacy LM3S designs needing higher performance or FPU capability |
| STM32F103VET6 | ARM Cortex-M3 at 72 MHz, 512 KB flash, 64 KB SRAM, but lacks integrated QEI and analog comparator | Requires external QEI decoder or GPIO-based counting; ADC has no hardware averaging or sequencer flexibility | Choose for cost-sensitive applications where QEI and comparator are not required and larger flash is needed |
Compared with TM4C123GH6PM and STM32F103VET6, the LM3S818-EQN50-C2 delivers optimized motor control integration in a mature, production-qualified package-ideal for stable-volume industrial designs where pin compatibility, proven reliability, and minimal peripheral add-ons are prioritized over raw clock speed or flash size.
Availability
LM3S818-EQN50-C2 is available at Aetrix Electronics and suitable for industrial motor control, embedded HMI panels, smart sensor nodes, and power supply monitoring requiring stable component supply and long-term lifecycle support.
Supply support for LM3S818-EQN50-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive-grade microcontrollers.
The Stellaris LM3S series was designed specifically for real-time embedded control applications demanding integrated analog, motion control, and communication peripherals in a single-chip solution-targeting industrial automation, motor drives, and human-machine interfaces.
FAQ
What is the maximum operating frequency of the LM3S818-EQN50-C2?
The LM3S818-EQN50-C2 operates at a maximum CPU frequency of 50 MHz, achieved using the internal PLL with an external 6 MHz crystal or precision oscillator. This frequency is fully supported across the industrial temperature range (–40°C to +85°C) and enables real-time execution of motor control algorithms and communication stacks. The LM3S818-EQN50-C2 maintains timing compliance under worst-case voltage and temperature conditions per TI SPMS161I datasheet Section 18.
Does the LM3S818-EQN50-C2 include an internal voltage regulator?
Yes, the LM3S818-EQN50-C2 integrates an on-chip low-dropout (LDO) regulator that converts a 3.3 V input (VDDA) to 1.8 V for the core logic. This eliminates the need for an external core regulator and simplifies power design. The LDO is specified to deliver stable 1.8 V output with ≤2 % regulation error over load and temperature, as documented in Section 19.1.3 of the LM3S818-EQN50-C2 datasheet.
Can the LM3S818-EQN50-C2 support USB device functionality?
No, the LM3S818-EQN50-C2 does not include a USB controller or transceiver. While it features USB-related pins (USB0_VBUS, USB0_ID, USB0_DM, USB0_DP), these are present only for future-compatible pinout alignment and cannot be used for USB communication. USB capability was introduced in later Stellaris generations (e.g., LM3S9B92) and Tiva C series devices. The LM3S818-EQN50-C2 relies on UART, SSI, or CAN for host connectivity.
What are the ADC capabilities of the LM3S818-EQN50-C2?
The LM3S818-EQN50-C2 features an 8-channel, 12-bit successive approximation register (SAR) ADC with up to 1 MSPS sampling rate. It supports four independent sample sequencers, hardware averaging (up to 64 samples), differential input mode, and internal temperature sensor readback. These capabilities allow simultaneous multi-channel acquisition for motor current sensing and bus voltage monitoring without CPU overhead. All specifications are confirmed in Section 10 of the LM3S818-EQN50-C2 datasheet.
Is the LM3S818-EQN50-C2 pin-compatible with other LM3S devices?
The LM3S818-EQN50-C2 shares the same 100-pin LQFP package and core peripheral mapping with LM3S811, LM3S815, and LM3S817, but pin compatibility is limited to common signals (e.g., GPIO, UART, SSI). Critical differences exist in PWM channel assignment, QEI pin locations, and analog input routing. For example, QEI0 is on Port A for LM3S818-EQN50-C2 but on Port D for LM3S817. Therefore, direct replacement requires verification against each device's signal table (Section 17) and is not guaranteed across the LM3S family.
LM3S818-EQN50-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tray
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S818-EQN50-C2 FAQ
1.How can I place an order for LM3S818-EQN50-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-EQN50-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 LM3S818-EQN50-C2 reliable?
The price and inventory of LM3S818-EQN50-C2 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-C2 is usually 5 days.
3.What payment methods are accepted for LM3S818-EQN50-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-EQN50-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-EQN50-C2?
LM3S818-EQN50-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-EQN50-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 LM3S818-EQN50-C2?
For technical support, including LM3S818-EQN50-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-EQN50-C2 requirements.
6.How does Aetrix verify that LM3S818-EQN50-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S818-EQN50-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 LM3S818-EQN50-C2 meets industry standards.
7.What is the process for return or replacement of LM3S818-EQN50-C2?
All LM3S818-EQN50-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-EQN50-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 LM3S818-EQN50-C2 part is unused and in its original packaging.
Return procedure for LM3S818-EQN50-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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