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Texas Instruments LM3S818-IGZ50-C2T
- Part No.:
- LM3S818-IGZ50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LM3S818-IGZ50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
LM3S818-IGZ50-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 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-IGZ50-C2T datasheet, LM3S818-IGZ50-C2T pinout, LM3S818-IGZ50-C2T application, or LM3S818-IGZ50-C2T equivalent, key selection criteria include its 50 MHz Cortex-M3 core, on-chip analog peripherals, industrial-grade thermal rating, and support for real-time motor control via QEI and PWM with dead-band generation.
Technical Context
The LM3S818-IGZ50-C2T implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. Its system-level integration includes a programmable 8-channel ADC with hardware averaging, dual UARTs with FIFOs, and an SSI controller supporting SPI/Microwire modes.
Motor control capability is enabled by dedicated peripherals: a Quadrature Encoder Interface (QEI) for position/speed feedback, a 6-PWM generator with configurable dead-band, and analog comparators for overcurrent protection - all synchronized via shared clock domains and interrupt routing to the NVIC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max operation - enables deterministic real-time task scheduling with <1 µs interrupt latency. |
| Memory | 64 KB flash / 24 KB SRAM - sufficient for standalone firmware with bootloader, communication stacks, and control algorithms. |
| ADC | 10-bit, 8-channel, 1 MSPS - supports simultaneous sampling of multiple sensor inputs (e.g., current, voltage, temperature) in closed-loop motor drives. |
| PWM Outputs | 6-channel, 16-bit resolution, dead-band configurable - directly drives 3-phase inverter gate drivers with shoot-through prevention. |
| QEI Input | Quadrature encoder interface with index pulse detection - provides high-resolution position and direction tracking for BLDC/PMSM rotor commutation. |
| Operating Temp | –40°C to +85°C - qualified for deployment in industrial enclosures without active cooling. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount reflow processes and accessible debug/test points. |
Pinout & Package
LM3S818-IGZ50-C2T is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow TI's standardized Stellaris pinout layout for signal grouping (analog, digital I/O, power, clocks, debug).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Dedicated domains: VDD (digital core), VDDA (analog), VDDC (clock circuitry) - enable noise isolation between logic and precision analog sections. |
| PA0–PA7, PB0–PB7, etc. | GPIO with alternate functions | Each port supports up to 6 peripheral mappings (e.g., UART0TX, SSI0CLK, PWM0); configurable pull-up/down and slew rate. |
| U0RX/U0TX, U1RX/U1TX | UART serial I/O | Dual independent UARTs with 16-byte FIFOs - support host diagnostics and Modbus RTU slave implementation without CPU overhead. |
| SSI0CLK/SSI0FSS/SSI0RX/SSI0TX | Synchronous serial interface | Full-duplex SPI-compatible interface - connects to digital isolators, ADCs, or display controllers with programmable bit rate up to 25 Mbps. |
| QEI0PHASEA/QEI0PHASEB/QEI0INDEX | Quadrature encoder inputs | Dedicated hardware decoding of A/B/Index signals - eliminates software polling and supports 4x quadrature multiplication for 4× resolution gain. |
Key Features
| Feature | Design Value |
|---|---|
| ARM Cortex-M3 core with NVIC | Hardware-based interrupt prioritization and tail-chaining reduce ISR latency to ≤12 cycles - critical for time-critical motor fault response. |
| Integrated analog comparator | Two rail-to-rail comparators with programmable hysteresis - used for fast overcurrent detection (<100 ns response) feeding directly into PWM fault shutdown. |
| Hardware-accelerated QEI | Position counter, velocity capture, and direction detection implemented in dedicated logic - offloads CPU and ensures jitter-free timing. |
| Programmable dead-band generator | Configurable delay (0–15 cycles @ 50 MHz) inserted between complementary PWM outputs - prevents shoot-through in half-bridge drivers. |
| On-chip temperature sensor | Calibrated ±3°C accuracy across –40°C to +125°C - enables thermal derating and safe operating area monitoring without external sensors. |
Applications
| Industrial Motor Control | Factory Automation I/O Module |
|---|---|
Use Scenario: Closed-loop speed/position control of 3-phase AC induction or BLDC motors in conveyor systems and CNC axes. IC Role / Device Role / Timing Role: Real-time controller executing FOC or six-step commutation, processing QEI feedback, generating gated PWM outputs, and managing fault shutdown. Use Value: Integrated QEI, 6-PWM with dead-band, and analog comparators eliminate external timing ICs and discrete protection logic - reducing BOM count and PCB footprint. | Use Scenario: Modular remote I/O node collecting analog sensor data (4–20 mA, thermocouples), driving solenoids/relays, and communicating via RS-485 Modbus. IC Role / Device Role / Timing Role: Central data acquisition and actuation controller with simultaneous ADC sampling, GPIO state management, and UART-based protocol stack execution. Use Value: 8-channel 10-bit ADC with hardware averaging and dual UARTs with FIFOs enable reliable multi-sensor acquisition and deterministic serial communication without CPU intervention. |
| Embedded Human-Machine Interface | Power Supply Monitoring Unit |
Use Scenario: Local operator panel with touch overlay, LED indicators, pushbuttons, and serial display interface in HVAC or building control panels. IC Role / Device Role / Timing Role: GUI logic processor handling button debouncing, LED PWM dimming, display refresh timing, and UART/SPI display updates. Use Value: 24 KB SRAM supports frame buffer storage; GPIO flexibility allows direct drive of LEDs and buttons; integrated PWM simplifies brightness control without external timers. | Use Scenario: Secondary-side monitoring of DC-DC converter output (voltage, current, temperature) with alert signaling and logging in telecom rectifiers or server PSUs. IC Role / Device Role / Timing Role: Safety-critical supervisor performing periodic ADC measurements, comparator-triggered fault latching, and non-volatile event logging to flash memory. Use Value: On-chip temperature sensor and analog comparators provide autonomous overtemperature/overvoltage detection - enabling fail-safe shutdown independent of main controller. |
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 device: 80 MHz Cortex-M4F core, 256 KB flash, FPU, enhanced PWM and ADC features; same 100-pin LQFP footprint. | Supports floating-point math for advanced control algorithms; higher ADC throughput and more PWM generators - suited for next-gen designs requiring scalability. | Select when migrating legacy LM3S818-IGZ50-C2T designs toward higher performance or FPU-dependent code. |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB RAM; different pinout, no integrated QEI or analog comparator; requires external components for motor control safety. | Lacks hardware QEI and comparator - demands additional ICs for encoder interface and overcurrent protection in motor applications. | Choose for cost-sensitive general-purpose control where QEI/comparator are not required, but expect layout changes and added BOM complexity. |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S818-IGZ50-C2T offers purpose-built motor control peripherals in a mature, production-qualified package - ideal for stable, long-lifecycle industrial designs where feature parity and qualification history outweigh raw performance gains.
Availability
LM3S818-IGZ50-C2T is available at Aetrix Electronics and suitable for industrial motor control, factory automation I/O modules, embedded HMI panels, and power supply monitoring units requiring stable component supply and long-term lifecycle assurance.
Supply support for LM3S818-IGZ50-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 markets.
The Stellaris LM3S series was designed specifically for real-time embedded control in resource-constrained industrial environments - emphasizing integrated analog/motor peripherals, deterministic interrupt response, and extended temperature reliability.
FAQ
What is the maximum operating frequency of the LM3S818-IGZ50-C2T?
The LM3S818-IGZ50-C2T operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This frequency is fully supported across the industrial temperature range (–40°C to +85°C) and enables sub-microsecond interrupt response times essential for motor control loops. The LM3S818-IGZ50-C2T maintains timing compliance under worst-case voltage and temperature conditions per TI's production data specifications.
Does the LM3S818-IGZ50-C2T include an integrated analog-to-digital converter?
Yes, the LM3S818-IGZ50-C2T integrates a 10-bit, 8-channel successive-approximation ADC with a maximum sample rate of 1 MSPS. It supports hardware averaging across up to 64 samples per channel and includes a dedicated internal temperature sensor. These capabilities are documented in Section 10 of the official Texas Instruments datasheet for the LM3S818-IGZ50-C2T and are fully functional without external components.
What debugging interfaces does the LM3S818-IGZ50-C2T support?
The LM3S818-IGZ50-C2T supports JTAG and SWD (Serial Wire Debug) interfaces for full-featured on-chip debugging, including breakpoints, watchpoints, and real-time register inspection. Pins PA0–PA3 are multiplexed for JTAG TCK/TMS/TDI/TDO, and SWD uses PA0 (SWCLK) and PA1 (SWDIO). These interfaces are electrically and functionally validated in the LM3S818-IGZ50-C2T silicon and supported by TI's Stellarisware development tools.
Is the LM3S818-IGZ50-C2T pin-compatible with other Stellaris devices?
The LM3S818-IGZ50-C2T shares the same 100-pin LQFP package and core peripheral mapping with other LM3S8xx variants (e.g., LM3S811, LM3S815), but pin compatibility is limited to identical package types and does not extend to devices with different pin counts or alternate functions. The LM3S818-IGZ50-C2T pinout is fixed per TI's datasheet Figure 16-1 and must be verified against target variant datasheets before substitution.
What motor control peripherals are integrated into the LM3S818-IGZ50-C2T?
The LM3S818-IGZ50-C2T integrates three key motor control peripherals: a Quadrature Encoder Interface (QEI) for position/speed feedback, a 6-channel PWM generator with programmable dead-band insertion, and two analog comparators with fast response for overcurrent detection. All are hardware-accelerated and operate independently of the CPU - confirmed in Sections 14, 15, and 13 of the LM3S818-IGZ50-C2T datasheet.
LM3S818-IGZ50-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-VFQFN Exposed Pad
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S818-IGZ50-C2T FAQ
1.How can I place an order for LM3S818-IGZ50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-IGZ50-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-IGZ50-C2T reliable?
The price and inventory of LM3S818-IGZ50-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-IGZ50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S818-IGZ50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-IGZ50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-IGZ50-C2T?
LM3S818-IGZ50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-IGZ50-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-IGZ50-C2T?
For technical support, including LM3S818-IGZ50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-IGZ50-C2T requirements.
6.How does Aetrix verify that LM3S818-IGZ50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S818-IGZ50-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-IGZ50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S818-IGZ50-C2T?
All LM3S818-IGZ50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-IGZ50-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-IGZ50-C2T part is unused and in its original packaging.
Return procedure for LM3S818-IGZ50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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