Texas Instruments LM3S316-EGZ25-C2

Overview

LM3S316-EGZ25-C2 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, ADC (8-channel, 10-bit), PWM, and analog comparator. It targets motor control and industrial sensing applications requiring deterministic real-time response.

For engineers reviewing the LM3S316-EGZ25-C2 datasheet, LM3S316-EGZ25-C2 pinout, LM3S316-EGZ25-C2 application, or LM3S316-EGZ25-C2 equivalent, key selection criteria include its 25 MHz operation speed, QFP-48 package, 10-bit ADC resolution, integrated PWM with dead-band generation, and support for JTAG/SWD debug interfaces.

Technical Context

The LM3S316-EGZ25-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and system-level peripherals including SysTick timer and memory protection unit (MPU). It supports three low-power sleep modes and features a configurable clock tree with PLL-based system clock derivation from internal or external sources.

Peripherals are memory-mapped and share a single AHB bus to the CPU, with GPIOs supporting up to 16 alternate functions per port. The ADC includes hardware averaging and internal temperature sensor, while the PWM module provides two independent 16-bit timers with dead-band insertion and fault shutdown capability.

Key Specifications

Pinout & Package

LM3S316-EGZ25-C2 is housed in a 48-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, thermally enhanced for industrial ambient temperatures up to 105°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S316-EGZ25-C2, LM3S328-EGZ25-C2 offers memory scalability without architectural change, while TM4C123GH6PM delivers significant performance and feature upgrades at the cost of non-interchangeable packaging and revised PCB layout.

Availability

LM3S316-EGZ25-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and power supply monitors requiring stable component supply across extended production lifecycles.

Supply support for LM3S316-EGZ25-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and wireless technologies with decades of industrial and automotive qualification experience.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial control applications where deterministic response, integrated analog/motor peripherals, and long-term supply stability are critical - preceding the Tiva C line as TI's first Cortex-M3 microcontroller family.

FAQ

What is the maximum operating frequency of the LM3S316-EGZ25-C2?

The LM3S316-EGZ25-C2 operates at a maximum system clock frequency of 25 MHz, derived from an internal precision oscillator or external crystal via its PLL circuitry. This speed is fixed for this variant - unlike some other LM3S parts, the -EGZ25-C2 does not support overclocking beyond 25 MHz, and all timing-critical peripherals (PWM, UART baud rates, ADC sampling) scale accordingly. The LM3S316-EGZ25-C2 datasheet specifies timing margins and setup/hold requirements based on this 25 MHz limit.

Does the LM3S316-EGZ25-C2 support JTAG debugging?

Yes, the LM3S316-EGZ25-C2 supports full IEEE 1149.1 JTAG debugging through dedicated pins (TCK, TMS, TDI, TDO, nTRST) and is compatible with standard JTAG emulators such as TI's ICDI and third-party tools like Segger J-Link. It also supports Serial Wire Debug (SWD) mode using TCK and TMS pins, reducing debug footprint. The LM3S316-EGZ25-C2 implements ARM CoreSight-compliant debug architecture with breakpoints, watchpoints, and real-time memory access during halt or run modes.

What are the ADC capabilities of the LM3S316-EGZ25-C2?

The LM3S316-EGZ25-C2 integrates a single 10-bit successive-approximation ADC with eight input channels (ADC0–ADC7), configurable sample sequencers, and hardware averaging up to 64 samples. It supports both single-ended and differential input modes, includes an internal temperature sensor, and allows programmable trigger sources (timer, software, or external event). The LM3S316-EGZ25-C2 ADC achieves effective resolution improvement through averaging and meets timing specifications for conversion times down to 1 µs per sample at maximum clock rate.

Is the LM3S316-EGZ25-C2 pin-compatible with other LM3S devices?

No, the LM3S316-EGZ25-C2 is not universally pin-compatible across the LM3S family. Its 48-pin LQFP package and specific peripheral mapping (e.g., PWM0–PWM5 on PD0–PD5, ADC inputs on PE0–PE5) differ from variants like the LM3S3748 (100-pin BGA) or LM3S811 (64-pin LQFP). While some 48-pin LM3S parts share identical pinouts (e.g., LM3S317), the LM3S316-EGZ25-C2 requires verification against exact package drawings and signal tables - direct substitution without layout review is not guaranteed.

What industrial temperature range does the LM3S316-EGZ25-C2 support?

The LM3S316-EGZ25-C2 is rated for operation from –40°C to +105°C ambient temperature, meeting industrial-grade reliability requirements. This rating applies to the full specified electrical performance - including flash programming endurance, ADC accuracy, and GPIO drive strength - across the entire range. The LM3S316-EGZ25-C2 achieves this via process characterization and screening, and its thermal design supports sustained operation under convection-cooled conditions typical in enclosed industrial enclosures.