Texas Instruments LM3S1911-EQC50-A2

Overview

LM3S1911-EQC50-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, GPIO, timers, watchdog, analog comparators, and hibernation module. It operates at up to 50 MHz, supports 3.3 V supply, and targets embedded control in industrial monitoring and motor drive systems.

For engineers reviewing the LM3S1911-EQC50-A2 datasheet, LM3S1911-EQC50-A2 pinout, LM3S1911-EQC50-A2 application, or LM3S1911-EQC50-A2 equivalent, key selection considerations include its 100-pin LQFP package, hibernation-capable real-time clock, dual UARTs with IrDA support, and Cortex-M3 debug infrastructure including SWD/JTAG and TPIU trace.

Technical Context

The LM3S1911-EQC50-A2 implements the ARMv7-M architecture with Thumb-2 instruction set, NVIC supporting 48 configurable interrupts, and SysTick timer for OS scheduling. Its memory system includes tightly coupled flash with prefetch buffer and SRAM with bit-band aliasing for atomic peripheral register access.

Peripherals are organized into APB buses with clock gating per module. The hibernation module provides battery-backed RTC, wake-on-RTC-match, and external wake capability independent of main power domain - enabling ultra-low-power sleep states down to 1.7 µA typical.

Key Specifications

Pinout & Package

LM3S1911-EQC50-A2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are multiplexed across GPIO banks A–F, with dedicated pins for JTAG, hibernation, reset, and clock inputs.

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-EQC50-A2 delivers optimal value in pure digital control applications where ADC or USB/CAN are unnecessary - preserving proven firmware compatibility while minimizing BOM cost and power consumption.

Availability

LM3S1911-EQC50-A2 is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, PLC I/O modules, and legacy protocol gateways requiring stable component supply and long-term obsolescence management.

Supply support for LM3S1911-EQC50-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive-grade microcontrollers.

The Stellaris LM3S series was designed as the first ARM Cortex-M3-based MCU family for cost-sensitive, real-time embedded control - emphasizing low-power operation, integrated debug, and peripheral flexibility for factory automation and motor drives.

FAQ

What is the maximum operating frequency of the LM3S1911-EQC50-A2?

The LM3S1911-EQC50-A2 operates at a maximum system clock frequency of 50 MHz. This is achieved using an internal PLL that multiplies the input crystal or oscillator frequency. The device supports multiple clock sources including an internal 6 MHz RC oscillator, external crystals up to 8 MHz, or external clock inputs - all configurable via the system control registers. The 50 MHz limit applies across the full industrial temperature range (–40°C to +85°C).

Does the LM3S1911-EQC50-A2 include an analog-to-digital converter (ADC)?

No, the LM3S1911-EQC50-A2 does not include an ADC. It features two analog comparators with programmable reference voltage, but no successive-approximation or sigma-delta ADC. For designs requiring analog measurement, Texas Instruments offers the pin-compatible LM3S1968-IQC50-A2 variant, which integrates a 10-bit 8-channel ADC. The absence of ADC in LM3S1911-EQC50-A2 reduces die size and cost while retaining full digital control and communication capability.

What debug interfaces does the LM3S1911-EQC50-A2 support?

The LM3S1911-EQC50-A2 supports both JTAG (IEEE 1149.1) and Serial Wire Debug (SWD) interfaces for programming and real-time debugging. It also includes a Trace Port Interface Unit (TPIU) capable of streaming instruction trace data at full CPU speed. These interfaces are accessible via dedicated pins (TCK, TMS, TDI, TDO, SWDIO, SWCLK) and require no external level shifters for standard 3.3 V debug probes such as TI's XDS100v3 or Segger J-Link.

Is the LM3S1911-EQC50-A2 RoHS compliant and halogen-free?

Yes, the LM3S1911-EQC50-A2 is RoHS compliant and halogen-free per TI's official product change notices and material declarations. It meets EU Directive 2011/65/EU (RoHS 2) and satisfies JEDEC JS709B requirements for bromine and chlorine content. The "-EQ" suffix in the part number indicates the 100-pin LQFP package with lead-free (Pb-free) finish and green molding compound - verified in TI's SPMS032I datasheet revision history and packaging documentation.

Can the LM3S1911-EQC50-A2 operate from a single 3.3 V supply?

Yes, the LM3S1911-EQC50-A2 is designed to operate from a single 3.3 V supply across its full specified voltage range (3.0 V to 3.6 V). All I/O pins are 5-V tolerant when configured as inputs, and internal regulators generate the required core (1.2 V) and analog (2.5 V) voltages. No external voltage translation is needed for interfacing with standard 3.3 V peripherals, though decoupling capacitors (100 nF ceramic + 4.7 µF tantalum per VDD pair) must be placed per TI layout guidelines to ensure stable operation at 50 MHz.