Texas Instruments LM3S2139-IQC25-A2

Overview

LM3S2139-IQC25-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated CAN 2.0A/B controller, 8-channel 12-bit ADC, and dual UARTs. It operates at up to 50 MHz and supports industrial motor control and embedded automation systems requiring real-time I/O, deterministic interrupt response, and fieldbus connectivity.

For engineers reviewing the LM3S2139-IQC25-A2 datasheet, LM3S2139-IQC25-A2 pinout, LM3S2139-IQC25-A2 application, or LM3S2139-IQC25-A2 equivalent, key selection criteria include its 50 MHz CPU clock, CAN interface compliance, 12-bit ADC resolution with hardware averaging, GPIO interrupt capability per pin, and support for Thumb-2 instruction set in a 100-pin LQFP package.

Technical Context

The LM3S2139-IQC25-A2 implements the ARM Cortex-M3 core with nested vectored interrupt controller (NVIC), memory protection unit (MPU), and SysTick timer. It integrates peripheral sets including two UARTs with IrDA/SIR support, one SSI, one I²C, and a dedicated CAN 2.0A/B controller with 32 message objects and programmable bit timing.

Its analog subsystem includes an 8-channel 12-bit ADC with four sample sequencers, hardware averaging (up to 64 samples), and internal temperature sensor. System-level features include power management with sleep/deep-sleep modes, reset control with brown-out detection, and clock gating per peripheral domain.

Key Specifications

Pinout & Package

LM3S2139-IQC25-A2 is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, thermal pad exposed on underside, and standard JEDEC MO-220 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VET6, the LM3S2139-IQC25-A2 offers verified CAN 2.0A/B hardware acceleration and deterministic interrupt latency ideal for legacy industrial fieldbus integration, but lacks FPU and has lower maximum clock speed than either alternative.

Availability

LM3S2139-IQC25-A2 is available at Aetrix Electronics and suitable for industrial motor control, building automation gateways, factory floor I/O modules, and energy meter communication hubs requiring stable component supply and long-term obsolescence management.

Supply support for LM3S2139-IQC25-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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring integrated fieldbus interfaces, deterministic interrupt response, and industrial-grade reliability in compact form factors.

FAQ

What is the maximum operating frequency of the LM3S2139-IQC25-A2?

The LM3S2139-IQC25-A2 operates at a maximum system clock frequency of 50 MHz. This is achieved using the internal PLL with a 1–25 MHz crystal input. The ARM Cortex-M3 core executes instructions at this frequency with single-cycle access to flash memory enabled by its 128-bit wide interface and prefetch buffer, ensuring consistent real-time performance for time-critical tasks such as motor control and CAN messaging.

Does the LM3S2139-IQC25-A2 include an integrated CAN controller?

Yes, the LM3S2139-IQC25-A2 includes a fully compliant CAN 2.0A/B controller with 32 message objects, programmable bit timing, and hardware acceptance filtering. It supports both standard and extended identifiers, automatic retransmission, and error confinement-enabling direct connection to industrial CAN networks without external protocol ICs. The CAN module is accessible via dedicated CAN0RX and CAN0TX pins on the 100-pin LQFP package.

What are the memory resources available on the LM3S2139-IQC25-A2?

The LM3S2139-IQC25-A2 provides 256 KB of on-chip flash memory for program storage and 32 KB of single-cycle SRAM with parity checking for data and stack operations. Flash supports in-system programming and sector erase; SRAM includes hardware parity for error detection. Both memories are mapped into the Cortex-M3 unified memory space and accessible via the AHB bus with zero-wait-state operation at 50 MHz.

Which communication interfaces does the LM3S2139-IQC25-A2 support?

The LM3S2139-IQC25-A2 supports UART (dual), SSI (SPI-compatible), I²C, CAN 2.0A/B, and USB 2.0 Device/Host/OTG modes. Each interface has dedicated DMA channels and interrupt vectors. UARTs include IrDA and SIR support; SSI supports master/slave operation with programmable frame formats; I²C operates up to 400 kHz; CAN supports bit rates up to 1 Mbps; USB requires external PHY for full-speed operation.

What is the operating temperature range for the LM3S2139-IQC25-A2?

The LM3S2139-IQC25-A2 is rated for industrial operation from –40°C to +85°C ambient temperature. This rating applies to the IQC25 variant, confirmed in the Texas Instruments production datasheet DS-LM3S2139-15852.2743. The device includes internal temperature sensor circuitry and brown-out reset functionality to maintain reliable operation across this full range under varying supply and load conditions.