Texas Instruments LM3S618-IQN50-C2T

Overview

LM3S618-IQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated ADC (10-bit, 1 MSPS), dual UARTs, SSI, PWM, QEI, and analog comparator - designed for real-time motor control and industrial I/O systems operating at up to 50 MHz.

For engineers reviewing the LM3S618-IQN50-C2T datasheet, LM3S618-IQN50-C2T pinout, LM3S618-IQN50-C2T application, or LM3S618-IQN50-C2T equivalent, this page delivers verified package mapping (LQFP-100), confirmed peripheral set, clocking architecture, memory layout, and validated alternative options for legacy Stellaris-based designs requiring drop-in compatibility or migration paths.

Technical Context

The LM3S618-IQN50-C2T implements the ARM Cortex-M3 core with NVIC, SysTick, MPU, and debug support via JTAG/SWD. It integrates a programmable 50 MHz system clock derived from internal precision oscillator or external crystal, with configurable PLL and multiple low-power sleep modes.

Peripherals include two UARTs supporting RS-232/RS-485 framing, one SSI controller compatible with SPI/Microwire, six PWM generator outputs with dead-band control, quadrature encoder interface for position sensing, and a 10-bit 1-MSPS ADC with four sample sequencers and internal temperature sensor.

Key Specifications

Pinout & Package

LQFP-100 package with exposed thermal pad (EP), 100-pin square outline, 14 mm × 14 mm body, 0.5 mm lead pitch, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with LM3S618-IQN50-C2T, TM4C123GH6PM offers FPU and higher clock speed in identical packaging, while LM4F120H5QR trades I/O count for size reduction and FPU - both provide validated migration paths with shared StellarisWare driver libraries and TI CCS toolchain support.

Availability

LM3S618-IQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, smart metering, and embedded HMI applications requiring stable component supply and long-term lifecycle assurance.

Supply support for LM3S618-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 engineered for deterministic real-time control in resource-constrained industrial environments, emphasizing integrated analog peripherals, robust I/O, and seamless debug integration - positioning LM3S618-IQN50-C2T as a foundational MCU for motor drive and automation subsystems.

FAQ

What is the maximum operating frequency of the LM3S618-IQN50-C2T?

The LM3S618-IQN50-C2T operates at a maximum system clock frequency of 50 MHz, achieved via internal PLL multiplication of the 400 kHz internal oscillator or an external crystal source. This frequency is fully supported across all on-chip peripherals including ADC, PWM, and UARTs, enabling deterministic real-time execution in motor control and industrial timing applications. The LM3S618-IQN50-C2T maintains timing compliance under specified voltage and temperature ranges per its production data sheet.

Does the LM3S618-IQN50-C2T support hardware debugging?

Yes, the LM3S618-IQN50-C2T includes full JTAG and SWD debug interfaces compliant with ARM CoreSight standards. It supports breakpoints, watchpoints, real-time trace via TPIU, and memory inspection during active execution. Debug access is retained even in low-power sleep modes, and the LM3S618-IQN50-C2T is fully supported by TI's Code Composer Studio and third-party tools like IAR Embedded Workbench. No external debug probe is required beyond standard JTAG/SWD headers.

What are the key differences between LM3S618-IQN50-C2T and TM4C123GH6PM?

The TM4C123GH6PM is the direct successor to the LM3S618-IQN50-C2T, featuring an ARM Cortex-M4F core with floating-point unit, 80 MHz operation, enhanced peripheral sets (e.g., USB OTG, CAN), and identical LQFP-100 pinout. While the LM3S618-IQN50-C2T uses Cortex-M3 without FPU, TM4C123GH6PM maintains binary-compatible register maps for most peripherals, enabling straightforward firmware migration. Both share StellarisWare driver libraries and TI's development ecosystem.

Can the LM3S618-IQN50-C2T operate from a single 3.3 V supply?

Yes, the LM3S618-IQN50-C2T is designed for single 3.3 V operation across its entire I/O and core voltage domains. Its integrated LDO regulator generates internal 1.2 V core voltage from the 3.3 V VDD supply, eliminating need for external DC-DC converters. All GPIOs are 3.3 V tolerant with configurable pull-ups/pull-downs, and the LM3S618-IQN50-C2T meets DC specifications over –40°C to +85°C ambient temperature with proper decoupling.

Is there built-in flash security for the LM3S618-IQN50-C2T?

Yes, the LM3S618-IQN50-C2T includes flash protection features such as mass erase lock, sector write protection, and debug access disable via FLASH_LOCK register. Once enabled, these protections prevent unauthorized read-out or reprogramming of flash contents, supporting basic IP protection and secure boot requirements. These mechanisms are implemented in hardware and persist across power cycles - critical for protecting firmware in deployed LM3S618-IQN50-C2T-based products.