Texas Instruments LM3S611-EQN50-C2T

Overview

LM3S611-EQN50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated ADC (10-bit, 8-channel), dual UARTs, I²C, SSI, PWM, and GPIO-designed for real-time motor control and industrial sensing applications operating at up to 50 MHz.

For engineers reviewing the LM3S611-EQN50-C2T datasheet, LM3S611-EQN50-C2T pinout, LM3S611-EQN50-C2T application, or LM3S611-EQN50-C2T equivalent, this page delivers verified electrical specs, package mapping to QFP-50, validated peripheral configuration limits, and direct alternative part comparisons for embedded control design.

Technical Context

The LM3S611-EQN50-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and memory protection unit (MPU). It supports deterministic real-time execution with hardware divide, single-cycle MAC, and bit-band addressing.

Its system-level integration includes on-chip LDO regulator (2.5–3.6 V input), clock gating per peripheral, sleep/wake-up via GPIO or timer events, and configurable reset sources including power-on, brown-out, and watchdog timeout-enabling robust operation in industrial environments.

Key Specifications

Pinout & Package

LM3S611-EQN50-C2T is housed in a 50-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions include dedicated analog inputs (AIN0–AIN7), PWM outputs (PWM0–PWM5), UART TX/RX/CTS/RTS, I²C SCL/SDA, SSI CLK/FRM/ Rx/Tx, and 43 GPIOs with multiple alternate functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S611-EQN50-C2T, LM3S608-EQN50-C2T reduces memory and sensing capability for lower BOM cost, while TM4C123GH6PM adds USB, FPU, and higher clock speed-making it suitable for next-generation upgrades but requiring PCB and firmware revision.

Availability

LM3S611-EQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controller (PLC) modules, and human-machine interface (HMI) controllers requiring stable component supply and long-term production support.

Supply support for LM3S611-EQN50-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 industrial and automotive qualification experience.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded control applications-emphasizing deterministic interrupt response, integrated analog/motor peripherals, and seamless migration to ARM Cortex-M architecture.

FAQ

What is the maximum operating frequency of the LM3S611-EQN50-C2T?

The LM3S611-EQN50-C2T operates at a maximum system clock frequency of 50 MHz. This is achieved using the internal PLL driven by the precision 12 MHz crystal oscillator or an external clock source. All peripherals-including ADC, UART, and PWM-are fully functional at this speed, with zero-wait-state SRAM access ensuring deterministic real-time performance. The LM3S611-EQN50-C2T datasheet confirms timing compliance across industrial temperature ranges (–40°C to +85°C) at 50 MHz.

Does the LM3S611-EQN50-C2T support in-circuit debugging and programming?

Yes, the LM3S611-EQN50-C2T integrates a standard ARM JTAG debug interface compatible with TI's ICDI, Segger J-Link, and OpenOCD tools. It supports full-speed SWD and JTAG modes, flash programming, breakpoint setting, and real-time variable inspection without halting system clocks. The LM3S611-EQN50-C2T uses dedicated PF0–PF3 pins for debug, which can be reassigned as GPIO after programming-enabling production-ready pin multiplexing. Debug access remains available even when flash is write-protected.

What analog input capabilities does the LM3S611-EQN50-C2T provide?

The LM3S611-EQN50-C2T features a 10-bit successive approximation register (SAR) ADC with eight single-ended input channels (AIN0–AIN7), supporting up to 1 MSPS conversion rate. It includes hardware sample averaging (2–64 samples), differential input mode, and an integrated temperature sensor calibrated to ±3°C accuracy. Inputs are mapped across GPIO ports A, D, and F, and conversions can be triggered by software, timer, or PWM events-ensuring synchronized acquisition in motor control loops. The LM3S611-EQN50-C2T ADC meets full specification across its rated voltage and temperature range.

Is the LM3S611-EQN50-C2T pin-compatible with other Stellaris devices in the same package?

The LM3S611-EQN50-C2T shares the same 50-pin LQFP footprint and pinout with other EQN50 variants in the LM3S6xx family-including LM3S601, LM3S608, and LM3S610-enabling drop-in replacement where flash, SRAM, or peripheral differences are acceptable. However, pin compatibility does not guarantee functional equivalence: for example, LM3S608 lacks the internal temperature sensor and has reduced memory. Always verify peripheral enablement and register mapping before substitution. The LM3S611-EQN50-C2T datasheet explicitly documents shared pin definitions across this variant group.

What power supply requirements must be met for reliable operation of the LM3S611-EQN50-C2T?

The LM3S611-EQN50-C2T requires a single 2.5–3.6 V supply on VDD, with on-chip LDO regulation delivering stable 3.3 V core and I/O voltage. Decoupling mandates 100 nF ceramic capacitor per VDD/GND pair, placed within 5 mm of each power pin. Total supply current ranges from <10 µA in power-down mode to 32 mA at 50 MHz with all peripherals active. The LM3S611-EQN50-C2T includes brown-out reset (BOR) circuitry that asserts reset below 2.1 V, ensuring safe operation during voltage transients.