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Texas Instruments LM3S818-EGZ50-C2
- Part No.:
- LM3S818-EGZ50-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LM3S818-EGZ50-C2.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,243
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Product details
Overview
LM3S818-EGZ50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (10-bit, 8-channel), UART, SSI, PWM, QEI, and analog comparator. It operates at 50 MHz, supports 3.3 V supply, and targets motor control and industrial sensing applications.
For engineers reviewing the LM3S818-EGZ50-C2 datasheet, LM3S818-EGZ50-C2 pinout, LM3S818-EGZ50-C2 application, or LM3S818-EGZ50-C2 equivalent, this page delivers verified electrical specs, package mapping, functional role in real-time control systems, and validated alternative options for legacy Stellaris-based designs.
Technical Context
The LM3S818-EGZ50-C2 implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic interrupt handling and memory protection. It integrates dedicated motor control peripherals including QEI for position feedback and PWM with dead-band generation for three-phase drive.
Its analog subsystem includes an internal temperature sensor and hardware sample averaging for noise reduction in sensor interfaces. Clock management supports PLL-based 50 MHz operation from external crystal or internal oscillator, with configurable power modes (sleep, deep-sleep) for low-power embedded operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, supports Thumb-2 instruction set for compact code and efficient interrupt response. |
| Max Clock Speed | 50 MHz - enables real-time execution of motor control loops with sub-10 µs timing resolution. |
| Flash Memory | 64 KB - sufficient for firmware with bootloader, communication stack, and control algorithms in standalone embedded systems. |
| SRAM | 24 KB - supports multiple buffers for UART/SSI FIFOs, ADC data arrays, and runtime variable storage. |
| ADC | 10-bit, 8-channel, up to 1 MSPS - suitable for analog sensor acquisition (e.g., current sense, temperature, potentiometer) without external oversampling. |
| PWM Outputs | 6-channel, 16-bit resolution with programmable dead-band - directly drives gate drivers in BLDC or stepper motor control topologies. |
| QEI Interface | Dedicated quadrature encoder input with index pulse detection - enables precise rotor position tracking in closed-loop motor control. |
Pinout & Package
LM3S818-EGZ50-C2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments support full peripheral multiplexing while maintaining GPIO flexibility for system I/O expansion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power Supply Inputs | Separate digital (VDD), analog (VDDA), and core (VDDC) rails enable noise isolation for ADC and CPU domains. |
| GND, GNDA, GNDC | Ground Returns | Dedicated analog (GNDA) and core (GNDC) grounds reduce coupling between sensitive analog and switching digital circuits. |
| PA0–PA7, PB0–PB7, etc. | GPIO / Alternate Function Pins | Each port supports UART, SSI, PWM, QEI, or ADC inputs via configurable alternate function select (AFSEL) registers. |
| OSC0, OSC1 | Crystal Oscillator Inputs | Accepts 4–8 MHz crystal for stable clock source; internal PLL multiplies to 50 MHz system clock. |
| nRST | Active-Low Reset Input | Asynchronous reset signal with internal pull-up; compatible with external reset supervisors or pushbutton circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Comparator | Two independent comparators with programmable reference voltage - enables fast over-current or zero-crossing detection without ADC conversion latency. |
| Hardware Sample Averaging | Up to 64-sample averaging per ADC sequence - improves effective resolution and reduces noise in low-SNR sensor measurements. |
| QEI with Index Detection | Quadrature decoder with direction, velocity, and index pulse capture - eliminates need for external logic in position feedback for servo or spindle control. |
| Programmable Dead-Band Generator | Configurable delay (1–1023 cycles) inserted between complementary PWM outputs - prevents shoot-through in half-bridge or inverter gate drive stages. |
| Memory Protection Unit (MPU) | 8-region MPU with subregion disable - enforces privilege separation between application code, bootloader, and peripheral drivers in safety-aware firmware. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed and position control of BLDC motors in HVAC blowers or conveyor drives. IC Role / Device Role / Timing Role: Real-time controller executing FOC or trapezoidal commutation, managing PWM timing, QEI feedback, and fault monitoring. Use Value: Integrated QEI and dead-band PWM eliminate external logic, reducing BOM count and PCB area while ensuring cycle-accurate timing alignment. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and air quality via analog sensors. IC Role / Device Role / Timing Role: Low-power host MCU acquiring sensor data via ADC and comparator, processing locally, and transmitting via UART to gateway. Use Value: Hardware sample averaging and internal temperature sensor reduce external components and calibration overhead, extending battery life through deep-sleep mode control. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Equipment |
Use Scenario: DIN-rail mounted I/O expansion module with digital input filtering, analog input conditioning, and isolated serial interface. IC Role / Device Role / Timing Role: Central processing unit for signal conditioning, debounce logic, and protocol translation (Modbus RTU over UART). Use Value: Multiple UARTs and GPIOs with programmable slew rate support robust industrial communications and ESD-tolerant field I/O interfacing. | Use Scenario: Portable blood glucose meter requiring precision analog front-end and secure firmware update capability. IC Role / Device Role / Timing Role: Safety-conscious controller managing ADC sampling, button interface, LCD driver, and encrypted firmware validation. Use Value: MPU-enforced memory isolation prevents unauthorized access to calibration constants and cryptographic keys stored in flash. |
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 80 MHz Cortex-M4F core, 256 KB flash, FPU, and enhanced peripheral set; same 100-pin LQFP footprint. | Supports floating-point math for advanced motor control algorithms and higher-speed communication stacks (USB, Ethernet MAC). | Select when upgrading legacy Stellaris designs requiring higher performance, FPU, or USB connectivity - requires minor firmware adaptation but no PCB change. |
| LM4F120H5QR | Pin-compatible Tiva C variant with 80 MHz Cortex-M4F, 256 KB flash, and identical peripheral register map to LM3S818 but with added FPU and USB. | Enables migration path with minimal software changes due to backward-compatible register layout and HAL libraries. | Choose for drop-in replacement where FPU acceleration or USB device functionality is needed without redesigning board layout. |
Compared with LM3S818-EGZ50-C2, TM4C123GH6PM and LM4F120H5QR offer higher clock speed, larger memory, and FPU support - making them suitable for next-generation implementations where computational headroom and peripheral expansion are critical, while retaining compatibility for incremental upgrades.
Availability
LM3S818-EGZ50-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and portable medical diagnostics requiring stable component supply and long-term obsolescence management.
Supply support for LM3S818-EGZ50-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 microcontrollers.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring integrated analog/motor control peripherals and ARM Cortex-M3 performance - targeting industrial automation, building control, and appliance markets.
FAQ
What is the maximum operating frequency of the LM3S818-EGZ50-C2?
The LM3S818-EGZ50-C2 operates at a maximum system clock frequency of 50 MHz, achieved using its on-chip PLL with an external 4–8 MHz crystal or internal oscillator. This frequency is specified under recommended DC operating conditions (3.0–3.6 V supply, ambient temperature ≤ 85°C) and enables deterministic execution of time-critical control tasks such as PWM generation and QEI decoding. The LM3S818-EGZ50-C2 maintains timing compliance across its full industrial temperature range.
Does the LM3S818-EGZ50-C2 include an internal temperature sensor?
Yes, the LM3S818-EGZ50-C2 integrates a factory-calibrated internal temperature sensor accessible via ADC channel 6. It provides ±3°C accuracy over the –40°C to +85°C range and requires no external components. This sensor is mapped into the ADC sequencer and can be sampled alongside other analog inputs, allowing the LM3S818-EGZ50-C2 to monitor die temperature for thermal throttling or system health reporting without adding BOM cost.
What debug interface does the LM3S818-EGZ50-C2 support?
The LM3S818-EGZ50-C2 supports JTAG debugging via dedicated TCK, TMS, TDI, TDO, and nTRST pins, compliant with IEEE 1149.1. It also supports SWD (Serial Wire Debug) using only SWCLK and SWDIO pins, enabling smaller debug connectors. Both interfaces provide full read/write memory access, breakpoint setting, and real-time register inspection - essential for developing and validating firmware on the LM3S818-EGZ50-C2 in industrial environments.
Can the LM3S818-EGZ50-C2 operate from a single 3.3 V supply?
Yes, the LM3S818-EGZ50-C2 is designed for single-supply operation at 3.3 V nominal (recommended range: 3.0–3.6 V). Its integrated LDO regulator generates internal core voltage (VDDC) from VDD, eliminating the need for external DC-DC conversion. All I/Os are 3.3 V tolerant, and the LM3S818-EGZ50-C2 meets AC/DC electrical specifications across this range, simplifying power design for compact embedded systems.
Is the LM3S818-EGZ50-C2 still in production or subject to obsolescence?
The LM3S818-EGZ50-C2 is a discontinued product in Texas Instruments' portfolio, superseded by the Tiva C series (e.g., TM4C123GH6PM). However, Aetrix Electronics maintains active inventory and offers extended lifecycle support, including traceable sourcing, last-time-buy coordination, and cross-reference guidance for migration to pin-compatible successors - ensuring continuity for legacy LM3S818-EGZ50-C2-based designs.
LM3S818-EGZ50-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-VFQFN Exposed Pad
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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-EGZ50-C2 FAQ
1.How can I place an order for LM3S818-EGZ50-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-EGZ50-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-EGZ50-C2 reliable?
The price and inventory of LM3S818-EGZ50-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-EGZ50-C2 is usually 5 days.
3.What payment methods are accepted for LM3S818-EGZ50-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-EGZ50-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-EGZ50-C2?
LM3S818-EGZ50-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-EGZ50-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-EGZ50-C2?
For technical support, including LM3S818-EGZ50-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-EGZ50-C2 requirements.
6.How does Aetrix verify that LM3S818-EGZ50-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S818-EGZ50-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-EGZ50-C2 meets industry standards.
7.What is the process for return or replacement of LM3S818-EGZ50-C2?
All LM3S818-EGZ50-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-EGZ50-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-EGZ50-C2 part is unused and in its original packaging.
Return procedure for LM3S818-EGZ50-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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