Texas Instruments LM3S1911-EQC50-A2T

Overview

LM3S1911-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, and integrated peripherals including UART, I²C, SSI, PWM timers, analog comparators, and hibernation module. It operates at up to 50 MHz, supports 3.3 V supply, and targets low-power embedded control in industrial and consumer systems.

For engineers reviewing the LM3S1911-EQC50-A2T datasheet, LM3S1911-EQC50-A2T pinout, LM3S1911-EQC50-A2T application, or LM3S1911-EQC50-A2T equivalent, key selection criteria include its 100-pin LQFP package, hibernation-capable real-time clock, NVIC-integrated interrupt handling, and Cortex-M3 core compliance with Thumb-2 instruction set.

Technical Context

The LM3S1911-EQC50-A2T implements the ARM Cortex-M3 processor core with nested vectored interrupt controller (NVIC), system timer (SysTick), memory protection unit (MPU), and debug interface via JTAG. It integrates a hibernation module with battery-backed RTC and SRAM, enabling ultra-low-power wake-up from deep sleep states.

Peripherals include two UARTs, one I²C master/slave, two SSI controllers, eight PWM-capable general-purpose timers, four analog comparators, and GPIOs with configurable alternate functions. Clock management supports multiple internal/external sources with programmable dividers and PLL bypass.

Key Specifications

Pinout & Package

LM3S1911-EQC50-A2T is housed in a 100-pin LQFP package with 0.5 mm pitch, exposed thermal pad, and JEDEC-standard footprint. Pin assignments support multiplexed peripheral signals across GPIO banks A–G, with dedicated JTAG, reset, clock, and power pins.

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-A2T delivers optimal balance of proven reliability, minimal peripheral overhead, and hibernation-optimized power efficiency - making it ideal for long-life, low-complexity embedded control where ADC or USB are unnecessary.

Availability

LM3S1911-EQC50-A2T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, motor control interfaces, and home automation hubs requiring stable component supply and long-term lifecycle support.

Supply support for LM3S1911-EQC50-A2T 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, automotive, and consumer markets.

The Stellaris LM3S series was designed specifically for cost-sensitive, low-power 32-bit embedded control applications - emphasizing integration, energy efficiency, and ease of migration from 8/16-bit MCUs.

FAQ

What is the maximum operating frequency of the LM3S1911-EQC50-A2T?

The LM3S1911-EQC50-A2T operates at a maximum system clock frequency of 50 MHz. This speed is achieved using the internal PLL with an external crystal or oscillator input, and it defines the upper bound for instruction execution rate, peripheral bus bandwidth, and real-time response capability. The LM3S1911-EQC50-A2T maintains full functionality-including all peripherals and memory interfaces-at this rated frequency under specified voltage and temperature conditions.

Does the LM3S1911-EQC50-A2T include an analog-to-digital converter (ADC)?

No, the LM3S1911-EQC50-A2T does not integrate an ADC. It includes four analog comparators with programmable references and interrupt outputs, but no sampling ADC subsystem. For designs requiring analog measurement, external ADCs or alternative Stellaris variants such as the LM3S1968 (which includes a 10-bit 8-channel ADC) must be considered. The LM3S1911-EQC50-A2T focuses on digital control, timing, and communication with minimal analog front-end complexity.

What debug interface does the LM3S1911-EQC50-A2T support?

The LM3S1911-EQC50-A2T supports JTAG-based debugging via five dedicated pins: TCK, TMS, TDI, TDO, and nTRST. It is fully compatible with TI's ICDI debug interface and third-party tools like Segger J-Link and ARM Keil ULINK. The JTAG interface enables full boundary-scan testing, flash programming, real-time variable inspection, and hardware breakpoint setting - all without requiring bootloader intervention. This capability is integral to the LM3S1911-EQC50-A2T's development workflow and field update strategy.

Is the LM3S1911-EQC50-A2T pin-compatible with other Stellaris devices?

The LM3S1911-EQC50-A2T shares the same 100-pin LQFP package and core peripheral mapping with several LM3S family members, including the LM3S1968 and LM3S811, but pin compatibility is not guaranteed across all signals due to variant-specific alternate function allocations. For example, certain GPIO pins assigned to SSI or PWM in the LM3S1911-EQC50-A2T may route different peripherals in other variants. Always verify signal mapping against the specific device's datasheet before assuming drop-in replacement. The LM3S1911-EQC50-A2T's pinout is fixed per its official datasheet revision SPMS032I.

What is the hibernation current specification for the LM3S1911-EQC50-A2T?

The hibernation current for the LM3S1911-EQC50-A2T is specified at 1.7 µA typical (2.5 µA maximum) when the hibernation module is active, the RTC is running, and 2 KB of SRAM is retained. This value is measured at 3.3 V and 25°C with all other peripherals disabled. The low hibernation current enables multi-year operation from primary batteries in remote monitoring and metering applications - a defining feature of the LM3S1911-EQC50-A2T's power architecture.