Texas Instruments LM3S300-IGZ25-C2T

Overview

LM3S300-IGZ25-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 25 MHz maximum CPU frequency, 32 KB flash memory, 8 KB SRAM, and integrated peripherals including UART, I²C, SSI, GPIO, timers, and analog comparators. It operates at 3.3 V supply and targets embedded control in industrial monitoring, motor drive interfaces, and sensor node applications.

For engineers reviewing the LM3S300-IGZ25-C2T datasheet, LM3S300-IGZ25-C2T pinout, LM3S300-IGZ25-C2T application, or LM3S300-IGZ25-C2T equivalent, key selection considerations include its 25 MHz clock rating, QFP-100 package, 32 KB/8 KB memory split, Cortex-M3 core with NVIC and SysTick, and support for real-time deterministic execution in resource-constrained systems.

Technical Context

The LM3S300-IGZ25-C2T implements the ARMv7-M architecture with Thumb-2 instruction set, delivering deterministic interrupt latency via a 240-entry NVIC and hardware-supported bit-banding. Its system-level interface includes JTAG debug, SWD-compatible serial wire debug, and trace port interface unit (TPIU) for real-time instruction tracing.

Peripherals are memory-mapped and clock-gated per module: UART supports up to 1 Mbps with FIFOs, I²C operates in standard/fast mode (100/400 kHz), SSI supports master/slave SPI modes at up to 10 MHz, and general-purpose timers provide one-shot, periodic, RTC, PWM, and input capture functions with 16-/32-bit resolution.

Key Specifications

Pinout & Package

LM3S300-IGZ25-C2T is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with 0.5 mm lead pitch and exposed thermal pad. Pin assignments follow TI's standardized Stellaris LM3S series pinout for signal compatibility across the family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S300-IGZ25-C2T, LM3S310-IGZ25-C2T offers double flash capacity without changing layout or firmware architecture, while TM4C123GH6PM delivers 3.2× CPU performance and modern features like USB and FPU-making it suitable for next-generation upgrades but requiring firmware porting effort.

Availability

LM3S300-IGZ25-C2T is available at Aetrix Electronics and suitable for industrial sensor nodes, motor drive interfaces, embedded HMI controllers, and power supply monitors requiring stable component supply and long-term production continuity.

Supply support for LM3S300-IGZ25-C2T 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 communications markets.

The Stellaris LM3S series was designed as Texas Instruments' first ARM-based microcontroller line, targeting cost-sensitive, real-time embedded applications requiring deterministic performance, integrated analog, and robust industrial qualification.

FAQ

What is the maximum operating frequency of the LM3S300-IGZ25-C2T?

The LM3S300-IGZ25-C2T has a maximum CPU clock frequency of 25 MHz, as specified in its electrical characteristics table. This rating applies under full industrial temperature range (–40°C to +85°C) and 3.3 V supply conditions. The device achieves this speed using an on-chip PLL that multiplies the input crystal frequency, and all peripherals-including UART, I²C, and SSI-are clocked synchronously to ensure timing compliance at this rate. LM3S300-IGZ25-C2T does not support overclocking beyond 25 MHz.

Does the LM3S300-IGZ25-C2T support in-circuit debugging?

Yes, the LM3S300-IGZ25-C2T supports full in-circuit debugging via its JTAG interface, compliant with IEEE 1149.1. It includes integrated debug components such as the Embedded Trace Macrocell (ETM) and Trace Port Interface Unit (TPIU), enabling real-time instruction trace and breakpoint management. Development tools like TI's ICDI-based debuggers and third-party J-Link adapters fully support LM3S300-IGZ25-C2T. Debug access remains functional even when running from internal flash or SRAM.

What are the memory resources available on the LM3S300-IGZ25-C2T?

The LM3S300-IGZ25-C2T integrates 32 KB of on-chip flash memory for program storage and 8 KB of SRAM for runtime data, stack, and heap. Flash supports sector erase, page programming, and read-while-write capability with hardware write protection bits. SRAM is zero-wait-state at maximum clock speed and includes parity checking in some configurations. Both memories are accessed via the Cortex-M3 bus matrix, and the MPU allows region-based access control. LM3S300-IGZ25-C2T does not include external memory interface pins.

Can the LM3S300-IGZ25-C2T operate from a single 3.3 V supply?

Yes, the LM3S300-IGZ25-C2T is designed to operate from a single 3.3 V nominal supply, with recommended operating range of 3.135 V to 3.465 V. It incorporates an internal low-dropout (LDO) regulator that generates the 1.2 V core voltage from VDD, eliminating the need for external core regulators. Separate VDDA and GNDA pins provide dedicated analog power routing, ensuring stable ADC and comparator operation. LM3S300-IGZ25-C2T requires no additional voltage rails beyond 3.3 V for full functionality.

Is the LM3S300-IGZ25-C2T pin-compatible with other Stellaris LM3S devices?

The LM3S300-IGZ25-C2T shares the same 100-pin LQFP package and pinout with other LM3S devices in the IGZ25-C2T suffix group, including LM3S310-IGZ25-C2T and LM3S360-IGZ25-C2T. Pin compatibility is confirmed in TI's "Stellaris LM3S Microcontroller Family Data Sheet" (SPMS064I), Section 14 (Pin Diagram) and Section 15 (Signal Tables). However, it is not pin-compatible with devices in different package types (e.g., 64-pin QFP) or differing speed grades (e.g., -IGZ50).