Texas Instruments LM3S612-EQN50-C2

Overview

LM3S612-EQN50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB Flash, 24 KB SRAM, and integrated ADC, PWM, UART, I²C, SSI, and analog comparator-designed for real-time motor control and industrial sensing applications operating at up to 50 MHz.

For engineers reviewing the LM3S612-EQN50-C2 datasheet, LM3S612-EQN50-C2 pinout, LM3S612-EQN50-C2 application, or LM3S612-EQN50-C2 equivalent, key selection criteria include its 50 MHz CPU clock, QFP-50 package with 39 GPIOs, 8-channel 10-bit ADC, dual PWM modules with dead-band generation, and support for deterministic interrupt latency in safety-critical embedded systems.

Technical Context

The LM3S612-EQN50-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and memory protection unit (MPU), enabling deterministic real-time response with sub-12-cycle interrupt latency. It integrates dedicated motor control peripherals including two 16/32-bit general-purpose timers with PWM output and quadrature encoder input capability.

Its analog subsystem includes an 8-channel 10-bit ADC with hardware averaging and internal temperature sensor, while serial connectivity comprises two UARTs, one I²C master/slave, and one SSI interface-all independently clocked and configurable for industrial bus protocols. The device operates across –40°C to +85°C with 3.3 V supply.

Key Specifications

Pinout & Package

LM3S612-EQN50-C2 is housed in a 50-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, 7 mm × 7 mm body, and exposed thermal pad for enhanced heat dissipation in motor control applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S612-EQN50-C2, LM3S608-EQN50-C2 reduces memory and analog capability for cost-constrained applications, while TM4C123GH6PM offers architectural upgrades and scalability-making it ideal for next-generation industrial firmware where computational headroom and peripheral richness matter.

Availability

LM3S612-EQN50-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and embedded HMI applications requiring stable component supply and long-term production continuity.

Supply support for LM3S612-EQN50-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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded control applications-emphasizing deterministic interrupt response, integrated analog/motor peripherals, and seamless migration to ARM Cortex-M architecture.

FAQ

What is the maximum operating frequency of the LM3S612-EQN50-C2?

The LM3S612-EQN50-C2 operates at a maximum system clock frequency of 50 MHz, achieved via internal PLL multiplication of an external 4–8 MHz crystal or oscillator input. This speed enables sub-20 ns instruction cycle time for time-critical motor control loops and ensures consistent timing margins for PWM generation and ADC sampling synchronization in the LM3S612-EQN50-C2.

Does the LM3S612-EQN50-C2 include an internal temperature sensor?

Yes, the LM3S612-EQN50-C2 integrates a factory-calibrated internal temperature sensor with ±3°C accuracy across the full –40°C to +85°C operating range. This sensor connects directly to ADC channel 7 and requires no external components, allowing the LM3S612-EQN50-C2 to monitor die temperature for thermal throttling or safety shutdown in motor drive and power supply applications.

How many PWM outputs does the LM3S612-EQN50-C2 support, and what advanced features are included?

The LM3S612-EQN50-C2 supports six independent PWM outputs derived from two PWM modules, each with two 16-bit generators. Key features include programmable dead-band insertion (1–64 clock cycles), fault pin input for immediate shutdown, and synchronous update of multiple PWM registers-enabling robust, glitch-free 3-phase inverter control without external logic. These capabilities are fully implemented in the LM3S612-EQN50-C2 silicon.

Is the LM3S612-EQN50-C2 pin-compatible with other Stellaris LM3S devices?

The LM3S612-EQN50-C2 uses a 50-pin LQFP package shared with several LM3S family members, including LM3S608-EQN50-C2 and LM3S610-EQN50-C2. Pinouts are identical for power, ground, JTAG, and primary peripheral signals (UART, I²C, SSI, ADC, PWM), enabling direct PCB reuse across these variants. However, GPIO alternate function mappings differ slightly-requiring firmware validation when substituting the LM3S612-EQN50-C2 into existing LM3S608 designs.

What debug interface does the LM3S612-EQN50-C2 support, and is SWD available?

The LM3S612-EQN50-C2 supports IEEE 1149.1 JTAG via five dedicated pins (TCK, TMS, TDI, TDO, nTRST) and is compatible with TI's ICDI and third-party JTAG debug adapters. While it does not implement Serial Wire Debug (SWD) natively, the JTAG interface provides full flash programming, breakpoint setting, and real-time register/memory access-meeting all standard development and production debug needs for the LM3S612-EQN50-C2.