Texas Instruments LM3S1911-IQC50-A2

Overview

LM3S1911-IQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, and integrated peripherals including UART, I²C, SSI, PWM timers, analog comparators, and hibernation module. It operates at up to 50 MHz, supports -40°C to +85°C industrial temperature range, and targets embedded control in motor drives and sensor nodes.

For engineers reviewing the LM3S1911-IQC50-A2 datasheet, LM3S1911-IQC50-A2 pinout, LM3S1911-IQC50-A2 application, or LM3S1911-IQC50-A2 equivalent, key selection criteria include its 100-pin LQFP package, hibernation-enabled low-power operation, Cortex-M3 interrupt latency, flash-based firmware update capability, and peripheral set optimized for real-time deterministic control.

Technical Context

The LM3S1911-IQC50-A2 implements the ARMv7-M architecture with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It integrates a hibernation module with battery-backed RTC and SRAM, enabling sub-μA sleep current while retaining state.

Its peripheral suite includes three UARTs, two SSI modules, one I²C interface, six 16/32-bit general-purpose timers (with PWM and RTC modes), eight analog comparators, and GPIOs with programmable slew rate and drive strength - all directly memory-mapped and accessible via APB bus.

Key Specifications

Pinout & Package

LM3S1911-IQC50-A2 is housed in a 100-pin LQFP package (JEDEC MO-140AC, 0.5 mm pitch). Pin assignments are defined per TI SPMS032I datasheet Section 15 (Pin Diagram) and Section 16.1 (100-Pin LQFP Signal Tables).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S1968-IQC50-A2 and TM4C123GH6PM, the LM3S1911-IQC50-A2 delivers the lowest system-level power in hibernation, minimal peripheral footprint for comparator-driven wake-up logic, and proven industrial qualification - making it the most efficient choice for applications prioritizing longevity and deterministic low-power operation over ADC or USB integration.

Availability

LM3S1911-IQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for LM3S1911-IQC50-A2 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 for industrial, automotive, and consumer markets.

The Stellaris LM3S series was designed as an early ARM Cortex-M3-based MCU family targeting cost-sensitive, real-time embedded control applications with integrated analog and power-efficient hibernation - preceding the TM4C line.

FAQ

What is the maximum operating frequency of the LM3S1911-IQC50-A2?

The LM3S1911-IQC50-A2 is rated for a maximum system clock frequency of 50 MHz under industrial temperature conditions (-40°C to +85°C). This frequency is achieved using the internal PLL with an external crystal or oscillator input, and it defines the upper limit for instruction execution speed, peripheral bus timing, and PWM resolution. The LM3S1911-IQC50-A2 maintains full specification compliance-including flash access timing and interrupt latency-at this speed.

Does the LM3S1911-IQC50-A2 include an analog-to-digital converter (ADC)?

No, the LM3S1911-IQC50-A2 does not integrate an ADC. It includes eight analog comparators with internal voltage reference and hysteresis control, but no successive-approximation or sigma-delta ADC. For designs requiring digitized analog signals, external ADCs or alternative Stellaris variants such as the LM3S1968-IQC50-A2 (which includes a 10-bit 8-channel ADC) must be considered. The LM3S1911-IQC50-A2 relies on comparator outputs for threshold-based decisions only.

What package type and pin count does the LM3S1911-IQC50-A2 use?

The LM3S1911-IQC50-A2 uses a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch), designated as "IQC" in TI's ordering nomenclature. This package is fully documented in the SPMS032I datasheet Sections 15 and 16.1, with pin functions mapped for GPIO, UART, SSI, I²C, timers, hibernation, and JTAG. It is not offered in BGA or smaller LQFP variants.

How does the hibernation module in the LM3S1911-IQC50-A2 reduce power consumption?

The hibernation module in the LM3S1911-IQC50-A2 reduces power consumption by gating clocks to all subsystems except the hibernation domain, which retains power to the RTC, 2 KB of SRAM, and wake-up logic. In hibernate mode, the LM3S1911-IQC50-A2 draws as little as 1.7 μA (typical) from the main VDD supply while maintaining timekeeping and detectable wake events. This eliminates the need for external RTC chips or backup batteries in long-life applications.

Is the LM3S1911-IQC50-A2 supported by modern development tools and software libraries?

The LM3S1911-IQC50-A2 is supported by legacy TI tools including Code Composer Studio v5.x and StellarisWare Peripheral Driver Library. While newer TI MCUs use the TivaWare library and CCS v6+, the LM3S1911-IQC50-A2 remains functional with maintained driver source code and example projects. No active feature development occurs, but existing binaries and documentation remain accessible via TI's archive site. Production use requires validation against current toolchain versions.