Texas Instruments LM3S1627-IQR50-A0

Overview

LM3S1627-IQR50-A0 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated ADC (12-bit, 1 MSPS), dual UARTs, I²C, SSI, PWM, and GPIOs - designed for real-time motor control and industrial automation systems requiring deterministic timing and analog signal acquisition.

For engineers reviewing the LM3S1627-IQR50-A0 datasheet, LM3S1627-IQR50-A0 pinout, LM3S1627-IQR50-A0 application, or LM3S1627-IQR50-A0 equivalent, this page provides verified package mapping (QFP-100), confirmed peripheral set (including hardware μDMA and temperature sensor), and validated alternative parts for migration paths in legacy Stellaris-based designs.

Technical Context

The LM3S1627-IQR50-A0 implements the ARMv7-M architecture with nested vectored interrupt controller (NVIC), memory protection unit (MPU), and SysTick timer - enabling deterministic real-time response down to 1 µs interrupt latency. It integrates a dedicated μDMA controller supporting 32-channel arbitration and peripheral-to-memory transfers without CPU intervention.

Its analog subsystem includes a 12-bit, 1 MSPS ADC with four independent sample sequencers, hardware averaging, and an internal temperature sensor calibrated across –40°C to +85°C. Clocking is managed via PLL-based system clock up to 50 MHz, derived from internal precision oscillator or external crystal.

Key Specifications

Pinout & Package

LM3S1627-IQR50-A0 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, JEDEC MS-026AC compliant. Pinout supports full peripheral multiplexing including dedicated JTAG/SWD debug pins, GPIOs with slew-rate control, and analog input channels mapped to physical pins AIN0–AIN7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S1627-IQR50-A0, TM4C123GH6PM delivers higher compute throughput and richer analog capability for next-generation industrial firmware, while LM3S811-IQN50-A2 offers a lower-cost path for non-demanding legacy upgrades - both require validation of flash layout and peripheral initialization sequences.

Availability

LM3S1627-IQR50-A0 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, smart power meters, and embedded HMI controllers requiring stable component supply and long-term obsolescence management.

Supply support for LM3S1627-IQR50-A0 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 microcontrollers for industrial and automotive markets.

The Stellaris LM3S series was engineered specifically for real-time embedded control applications demanding integrated analog peripherals, deterministic interrupt latency, and robust debug infrastructure - targeting motor drives, factory automation, and energy infrastructure.

FAQ

What is the maximum operating frequency of the LM3S1627-IQR50-A0?

The LM3S1627-IQR50-A0 operates at a maximum system clock frequency of 50 MHz, achieved via its internal PLL locked to either the internal precision oscillator or an external crystal. This frequency is fully supported across the entire specified temperature range (–40°C to +85°C) and enables sub-20 ns instruction cycles for time-critical control loops. The LM3S1627-IQR50-A0 maintains timing compliance without derating under worst-case voltage and temperature conditions.

Does the LM3S1627-IQR50-A0 include a hardware debug interface?

Yes, the LM3S1627-IQR50-A0 integrates a full JTAG interface compliant with IEEE 1149.1, including TCK, TMS, TDI, TDO, and nTRST pins - enabling boundary-scan testing, flash programming, and real-time debugging. It also supports Serial Wire Debug (SWD) mode via shared pins, and includes a Trace Port Interface Unit (TPIU) for instruction trace output. The LM3S1627-IQR50-A0 is fully compatible with TI's Code Composer Studio and third-party ARM debug probes.

How many ADC channels does the LM3S1627-IQR50-A0 support, and what is their resolution?

The LM3S1627-IQR50-A0 features a single 12-bit successive-approximation ADC with eight analog input channels (AIN0–AIN7), organized into four independent sample sequencers. Each sequencer supports up to eight steps with hardware averaging (2x–64x), and conversion rates up to 1 MSPS. The LM3S1627-IQR50-A0 also includes an internal temperature sensor connected to AIN6, calibrated across the full industrial temperature range.

Is the LM3S1627-IQR50-A0 pin-compatible with other Stellaris devices?

The LM3S1627-IQR50-A0 uses a 100-pin LQFP package identical in footprint and pin assignment to other LM3S devices in the same package variant (e.g., LM3S811-IQN50-A2 and LM3S9B92-IQR50-A0), enabling drop-in replacement within the same family. However, peripheral enablement, register maps, and memory layout differ - firmware must be validated for each specific part. The LM3S1627-IQR50-A0 shares pinout with TM4C123GH6PM but requires software adaptation due to architectural enhancements.

What power supply configurations does the LM3S1627-IQR50-A0 require?

The LM3S1627-IQR50-A0 requires three separate supply domains: VDD (1.8–3.6 V digital I/O), VDDA (1.8–3.6 V analog), and VDDC (1.2 V core). These must be decoupled independently using 0.1 µF ceramic capacitors near each supply pin. The LM3S1627-IQR50-A0 includes internal LDO regulation for VDDC and supports external bypass for improved noise immunity in high-EMI environments.