Texas Instruments LM3S1937-EQC50-A2T

Overview

LM3S1937-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 8-channel 12-bit ADC, and dual UART/SSI/I²C interfaces. It operates at 50 MHz, supports -40°C to +105°C industrial temperature range, and targets motor control and embedded industrial systems requiring low-power operation with real-time responsiveness.

For engineers reviewing the LM3S1937-EQC50-A2T datasheet, LM3S1937-EQC50-A2T pinout, LM3S1937-EQC50-A2T application, or LM3S1937-EQC50-A2T equivalent, key selection criteria include hibernation-capable power management, on-chip analog peripherals for sensor interfacing, and Cortex-M3 debug infrastructure including SWD/JTAG support and SysTick timer.

Technical Context

The LM3S1937-EQC50-A2T implements the ARMv7-M architecture with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and memory protection unit (MPU). It integrates a hibernation module with battery-backed RTC and 2 KB SRAM, enabling sub-μA sleep current while retaining timekeeping and critical state.

Peripherals include two UARTs supporting IrDA/SIR, two SSI controllers compatible with SPI/Microwire, and an I²C interface with master/slave capability. The 8-channel 12-bit ADC supports hardware averaging and differential sampling, and the PWM module provides six independent outputs with dead-band generation for motor drive applications.

Key Specifications

Pinout & Package

LM3S1937-EQC50-A2T is housed in a 100-pin LQFP (Leadless Quad Flat Package) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad for enhanced heat dissipation in industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VET6, the LM3S1937-EQC50-A2T delivers unique value in ultra-low-power hibernation with integrated RTC and battery-backed SRAM - making it irreplaceable in long-life, energy-constrained industrial nodes where timekeeping persistence across power loss is mandatory.

Availability

LM3S1937-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, factory automation gateways, and PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for LM3S1937-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 delivering high-reliability components for industrial, automotive, and aerospace applications.

The Stellaris LM3S family was designed specifically for cost-sensitive, real-time industrial control applications requiring integrated analog peripherals, deterministic interrupt response, and robust low-power operation - preceding the TM4C series with optimized Cortex-M3 implementation.

FAQ

What is the maximum operating frequency of the LM3S1937-EQC50-A2T?

The LM3S1937-EQC50-A2T operates at a maximum system clock frequency of 50 MHz. This speed is achieved using the internal PLL with a 4–25 MHz crystal input, and all peripherals-including ADC, UART, and PWM-are fully functional at this rate. The Cortex-M3 core executes Thumb-2 instructions with single-cycle 32-bit multiply, ensuring deterministic timing for real-time control loops in the LM3S1937-EQC50-A2T.

Does the LM3S1937-EQC50-A2T support USB device functionality?

Yes, the LM3S1937-EQC50-A2T includes a full-speed USB 2.0 device controller with integrated PHY. It supports CDC, HID, and MSC class devices but does not support USB host or OTG modes. The USB interface requires external VBUS sensing and proper termination; the LM3S1937-EQC50-A2T handles enumeration, endpoint management, and descriptor handling in firmware without external transceivers.

What is the purpose of the hibernation module in the LM3S1937-EQC50-A2T?

The hibernation module in the LM3S1937-EQC50-A2T enables ultra-low-power operation (<1.5 μA) while preserving RTC time, 2 KB of SRAM, and wake-up capability via external pins or RTC match. It uses a dedicated 32.768 kHz crystal and separate battery supply path, allowing the LM3S1937-EQC50-A2T to maintain timekeeping and critical state across main power loss-essential for battery-powered industrial sensors and gateways.

How many ADC channels does the LM3S1937-EQC50-A2T have, and what is their resolution?

The LM3S1937-EQC50-A2T features a single 12-bit successive-approximation ADC with eight input channels (AIN0–AIN7), configurable for single-ended or differential sampling. It supports hardware averaging over 2–64 samples per conversion and achieves up to 1 MSPS throughput. These capabilities make the ADC suitable for precision current sensing and temperature monitoring in motor control applications using the LM3S1937-EQC50-A2T.

Is the LM3S1937-EQC50-A2T pin-compatible with other Stellaris devices?

The LM3S1937-EQC50-A2T uses a 100-pin LQFP package shared across several LM3S devices, but pin compatibility is not guaranteed across the family. While power, ground, and some peripheral signals align, specific peripheral mappings (e.g., UART/SSI assignments) and GPIO alternate functions differ. Migration to another LM3S part requires validation of signal routing and firmware peripheral initialization - the LM3S1937-EQC50-A2T has no universal pin-compatible replacement within the Stellaris line.