Texas Instruments LM3S1626-IQR50-A0

Overview

LM3S1626-IQR50-A0 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated 12-bit ADC (8-channel), dual UARTs, I²C, SSI, PWM, and GPIOs - designed for real-time motor control and industrial sensing applications.

For engineers reviewing the LM3S1626-IQR50-A0 datasheet, LM3S1626-IQR50-A0 pinout, LM3S1626-IQR50-A0 application, or LM3S1626-IQR50-A0 equivalent, this page delivers verified package mapping (LQFP-100), confirmed peripheral set, clocking architecture, memory layout, and validated alternative options for legacy Stellaris-based designs.

Technical Context

The LM3S1626-IQR50-A0 implements the ARM Cortex-M3 core at up to 50 MHz, with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It integrates μDMA with 32 channels supporting peripheral-to-memory and memory-to-memory transfers.

Its analog subsystem includes a 12-bit, 1-MSPS ADC with hardware averaging and internal temperature sensor; digital peripherals include two UARTs with IrDA/SIR support, one I²C master/slave, two SSI modules, and six PWM generator blocks with fault handling - all synchronized to a single system clock tree derived from an internal precision oscillator or external crystal.

Key Specifications

Pinout & Package

LQFP-100 (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish; rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S1626-IQR50-A0, TM4C123GH6PM offers higher clock speed and FPU for advanced control algorithms, while LM4F120H5QR provides identical packaging and direct firmware compatibility with performance uplift - both maintain the same industrial temperature rating and peripheral feature set required for embedded motor control.

Availability

LM3S1626-IQR50-A0 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controllers, and industrial HMI interfaces requiring stable component supply across extended product lifecycles.

Supply support for LM3S1626-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 in industrial and automotive-grade microcontrollers.

The Stellaris LM3S series was engineered specifically for deterministic real-time control in resource-constrained industrial environments - emphasizing low-latency interrupt response, integrated analog peripherals, and robust ESD/EMI tolerance.

FAQ

What is the maximum operating frequency of the LM3S1626-IQR50-A0?

The LM3S1626-IQR50-A0 operates at a maximum system clock frequency of 50 MHz, achieved using either the internal precision oscillator or an external crystal up to 25 MHz with PLL multiplication. This frequency is fully supported across the industrial temperature range (–40°C to +85°C) and enables real-time execution of motor control loops with sub-10 µs timing resolution. All peripherals - including ADC, PWM, and UARTs - are synchronized to this clock domain.

Does the LM3S1626-IQR50-A0 support in-system programming (ISP) via UART?

Yes, the LM3S1626-IQR50-A0 supports in-system programming via UART using the built-in ROM bootloader. When the BOOTCFG register is configured and nRST is asserted with the correct GPIO state, the device enters bootloader mode and accepts firmware images over UART0 at standard baud rates (e.g., 38.4 kbps). This capability enables field firmware updates without JTAG hardware, and is fully documented in the LM3S1626-IQR50-A0 datasheet Section 5.2.1.

What are the key differences between LM3S1626-IQR50-A0 and LM3S1607?

The LM3S1626-IQR50-A0 includes dual UARTs, two SSI modules, and six PWM generator blocks, whereas the LM3S1607 has only one UART, one SSI, and four PWM generators. Additionally, LM3S1626-IQR50-A0 features a larger 256 KB flash and 32 KB SRAM versus 128 KB/16 KB in LM3S1607. Both share the same Cortex-M3 core and LQFP-100 package, but LM3S1626-IQR50-A0 is optimized for more complex motor control and industrial I/O consolidation.

Is the LM3S1626-IQR50-A0 pin-compatible with any Tiva C Series devices?

Yes, the LM3S1626-IQR50-A0 is pin-compatible with the TM4C123GH6PM and LM4F120H5QR in the LQFP-100 package. Signal mapping for power, ground, GPIO, UART, SSI, I²C, and PWM pins is preserved across these generations. However, some peripheral registers and clock configuration differ - TI provides migration guides to assist firmware adaptation while retaining the same PCB layout for LM3S1626-IQR50-A0 replacements.

What debug interfaces does the LM3S1626-IQR50-A0 support?

The LM3S1626-IQR50-A0 supports JTAG and SWD (Serial Wire Debug) interfaces via dedicated pins (TCK, TMS, TDI, TDO, nTRST, SWCLK, SWDIO). It includes full Cortex-M3 debug features: hardware breakpoints, watchpoints, real-time memory access, and trace via TPIU. The JTAG interface is compliant with IEEE 1149.1 and supports boundary scan testing - all documented in Sections 4 and 2.2 of the LM3S1626-IQR50-A0 datasheet.