Texas Instruments LM3S316-EQN25-C2

Overview

LM3S316-EQN25-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, and integrated peripherals including UART, I²C, SSI, ADC (8-channel, 12-bit), PWM, and analog comparator. It operates at up to 50 MHz and supports industrial temperature range (–40°C to +85°C) in a 100-pin LQFP package. It targets motor control, sensor interface, and embedded automation systems.

For engineers reviewing the LM3S316-EQN25-C2 datasheet, LM3S316-EQN25-C2 pinout, LM3S316-EQN25-C2 application, or LM3S316-EQN25-C2 equivalent, key selection criteria include flash/SRAM size, peripheral mix (especially dual PWM modules and hardware ADC averaging), operating voltage (2.25–3.6 V), and industrial-grade thermal performance.

Technical Context

The LM3S316-EQN25-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC for priority-based interrupt handling, and SysTick timer. It integrates a 12-bit ADC with four independent sample sequencers and hardware averaging, plus two PWM modules supporting dead-band generation and fault protection-critical for motor drive timing integrity.

Its system-level architecture includes programmable clock gating per peripheral, multiple low-power sleep modes (sleep/deep-sleep), and on-chip debug via JTAG/SWD. The device uses a single 3.3-V supply and supports internal voltage regulation with brown-out reset and power-on reset circuitry.

Key Specifications

Pinout & Package

LM3S316-EQN25-C2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined across five GPIO ports (A–E), each supporting multiple alternate functions including UART, I²C, SSI, PWM outputs, ADC inputs, and analog comparator inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VET6, the LM3S316-EQN25-C2 offers optimized integration for cost-sensitive industrial motor control-retaining essential analog features (comparator, hardware ADC averaging) and deterministic PWM timing at lower clock speed and power, without requiring FPU or extended memory.

Availability

LM3S316-EQN25-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and HVAC controllers requiring stable component supply and long-term lifecycle support.

Supply support for LM3S316-EQN25-C2 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 markets.

The Stellaris LM3S series was designed specifically for cost-effective, real-time embedded control in industrial automation, motor drives, and sensor-based systems-emphasizing analog integration, deterministic timing, and robust operation in harsh environments.

FAQ

What is the maximum operating frequency of the LM3S316-EQN25-C2?

The LM3S316-EQN25-C2 operates at a maximum system clock frequency of 50 MHz. This is achieved using the internal PLL with an external crystal or oscillator input, and it defines the upper limit for instruction execution, peripheral timing, and PWM resolution. The LM3S316-EQN25-C2 maintains full specification compliance-including ADC accuracy and PWM jitter-across its entire industrial temperature range at this speed.

Does the LM3S316-EQN25-C2 support hardware debug interfaces?

Yes, the LM3S316-EQN25-C2 supports both JTAG and Serial Wire Debug (SWD) interfaces via dedicated pins (PF0–PF3). SWD mode is enabled by default and requires only two signals (SWDIO and SWCLK), reducing debug footprint versus full JTAG. The LM3S316-EQN25-C2 is fully compatible with TI's Code Composer Studio and third-party tools like Segger J-Link for flash programming and real-time debugging.

What analog peripherals are integrated into the LM3S316-EQN25-C2?

The LM3S316-EQN25-C2 integrates an 8-channel, 12-bit, 1 MSPS ADC with four independent sample sequencers and hardware averaging (up to 64 samples), plus two analog comparators with programmable hysteresis and interrupt output. These peripherals are powered by a dedicated analog supply (VDDA) and share a common 1.65-V internal reference, enabling precise sensor interfacing without external components. All analog functionality is fully operational within the LM3S316-EQN25-C2's specified industrial temperature range.

Is the LM3S316-EQN25-C2 pin-compatible with other Stellaris devices?

No, the LM3S316-EQN25-C2 is not pin-compatible with other Stellaris family members such as the LM3S811 or LM3S9B92. While it shares the same 100-pin LQFP package outline, pin assignments for peripherals (e.g., PWM outputs, ADC inputs, UART signals) differ significantly across variants. Board designs must be validated against the LM3S316-EQN25-C2-specific pin diagram and signal tables-not generic Stellaris footprints.

What power supply requirements does the LM3S316-EQN25-C2 have?

The LM3S316-EQN25-C2 requires three distinct supply connections: VDD (digital core, 2.25–3.6 V), VDDA (analog, same voltage range), and VDDC (PLL/clock, also 2.25–3.6 V). Each supply must be independently decoupled with 0.1-μF ceramic capacitors placed near respective pins. GNDA (analog ground) must be connected to GND at a single point to prevent ADC measurement errors. The LM3S316-EQN25-C2 does not include an internal voltage regulator and relies on clean, externally supplied 3.3-V rails.