Texas Instruments LM3S618-EGZ50-C2

Overview

LM3S618-EGZ50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated ADC (12-bit, 1 MSPS), dual UARTs, SSI, 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 and embedded automation systems.

For engineers reviewing the LM3S618-EGZ50-C2 datasheet, LM3S618-EGZ50-C2 pinout, LM3S618-EGZ50-C2 application, or LM3S618-EGZ50-C2 equivalent, key selection criteria include Cortex-M3 core performance, on-chip analog peripherals (ADC + comparator), motor-control-specific features (QEI, PWM with dead-band), and industrial-grade thermal rating.

Technical Context

The LM3S618-EGZ50-C2 integrates an ARM Cortex-M3 processor core with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It supports Thumb-2 instruction set and delivers deterministic real-time response with sub-100 ns interrupt latency.

Its peripheral subsystem includes a 12-bit 1-MSPS ADC with hardware averaging and temperature sensor, dual 16-level FIFO UARTs, SSI for SPI/Microwire communication, and dedicated QEI for position/speed feedback in closed-loop motor drives.

Key Specifications

Pinout & Package

LM3S618-EGZ50-C2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per TI SPMS123I datasheet Section 16 (Pin Diagram) and Section 17 (Signal Tables).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320F28027FPTT and STM32F303VCT6, the LM3S618-EGZ50-C2 offers balanced real-time peripheral integration and industrial temperature qualification without requiring DSP expertise or FPU licensing, making it optimal for cost-sensitive motor control designs already leveraging TI's StellarisWare driver library.

Availability

LM3S618-EGZ50-C2 is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, smart inverters, and embedded HMI controllers requiring stable component supply across extended product lifecycles.

Supply support for LM3S618-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies since 1930.

The Stellaris LM3S family was designed specifically for cost-sensitive, real-time embedded applications in industrial automation and motor control - emphasizing integrated analog peripherals, deterministic interrupt response, and industrial-grade reliability.

FAQ

What is the maximum operating frequency of the LM3S618-EGZ50-C2?

The LM3S618-EGZ50-C2 operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL that accepts a 1–25 MHz crystal or external clock source. This frequency is fully supported across the industrial temperature range (–40°C to +85°C) and enables real-time execution of motor control algorithms with sub-microsecond loop timing. The LM3S618-EGZ50-C2 maintains timing compliance under all specified voltage and thermal conditions per TI SPMS123I datasheet Section 18.

Does the LM3S618-EGZ50-C2 include an internal temperature sensor?

Yes, the LM3S618-EGZ50-C2 integrates a factory-calibrated internal temperature sensor connected to ADC channel 6. It provides ±3°C accuracy over the full industrial temperature range and requires no external components. Software reads the sensor via the ADC sequencer, enabling thermal monitoring for fan control, derating, or safety shutdown. This feature is documented in Section 10.3.7 of the LM3S618-EGZ50-C2 datasheet.

What debug interfaces does the LM3S618-EGZ50-C2 support?

The LM3S618-EGZ50-C2 supports JTAG and SWD (Serial Wire Debug) interfaces for programming and real-time debugging. Its JTAG TAP controller implements IEEE 1149.1 compliance and supports boundary-scan testing, flash programming, and full-core visibility including register and memory access. SWD mode uses only two pins (SWDIO and SWCLK) and is enabled via boot configuration - both modes are natively supported by TI's Code Composer Studio and third-party tools targeting the LM3S618-EGZ50-C2.

Can the LM3S618-EGZ50-C2 operate without an external crystal?

Yes, the LM3S618-EGZ50-C2 can operate using its internal 6 MHz RC oscillator as the system clock source, eliminating the need for an external crystal in non-precision timing applications. However, for UART baud-rate accuracy better than ±3%, an external 1–25 MHz crystal or clock source is required. The internal oscillator is documented in Section 5.2.4 of the LM3S618-EGZ50-C2 datasheet and supports clock gating and calibration via the RCC register.

Is the LM3S618-EGZ50-C2 pin-compatible with other LM3S devices?

No, the LM3S618-EGZ50-C2 is not pin-compatible with other LM3S devices outside its specific variant group. While it shares the 100-pin LQFP package with LM3S6618 and LM3S6753, pin assignments for peripherals such as SSI, QEI, and PWM differ significantly. For example, QEI0PHASEA is on pin 42 in LM3S618-EGZ50-C2 but on pin 51 in LM3S6618. Always verify pin mapping against the exact part number's datasheet - TI SPMS123I Section 16 confirms this layout uniqueness.