Texas Instruments LM3S817-IQN50-C2

Overview

LM3S817-IQN50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (10-bit, 8-channel), dual UARTs, SSI, PWM, and analog comparator. It operates at up to 50 MHz, supports industrial temperature range (–40°C to +85°C), and targets motor control and embedded sensing applications.

For engineers reviewing the LM3S817-IQN50-C2 datasheet, LM3S817-IQN50-C2 pinout, LM3S817-IQN50-C2 application, or LM3S817-IQN50-C2 equivalent, key selection criteria include its 50 MHz CPU clock, 10-bit ADC sampling rate (up to 1 MSPS), GPIO interrupt capability per pin, integrated LDO regulator, and QFP-100 package compatibility with legacy Stellaris designs.

Technical Context

The LM3S817-IQN50-C2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. Its peripheral set includes two UARTs supporting RS-232/RS-485 modes, one SSI port compatible with SPI/Microwire, and a dedicated PWM module with dead-band generation and fault protection logic.

It integrates an on-chip 10-bit ADC with hardware averaging and internal temperature sensor, plus an analog comparator with programmable reference. Clock management includes PLL-based system clock derivation from external crystal or internal oscillator, with multiple sleep modes controlled via SCB registers.

Key Specifications

Pinout & Package

LM3S817-IQN50-C2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments are defined per TI SPMS159I datasheet Section 15 (Pin Diagram) and Section 16 (Signal Tables).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S817-IQN50-C2 offers optimal balance of analog integration, industrial temperature rating, and proven reliability in motor control - without requiring PCB redesign or new toolchain validation.

Availability

LM3S817-IQN50-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and embedded HMI controllers requiring stable component supply and long-term lifecycle support.

Supply support for LM3S817-IQN50-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 over 90 years of innovation in power management and microcontrollers.

The Stellaris LM3S family was designed specifically for deterministic real-time control in resource-constrained industrial and automotive subsystems - emphasizing integrated analog peripherals, low-latency interrupt response, and robust qualification across extended temperature ranges.

FAQ

What is the maximum operating frequency of the LM3S817-IQN50-C2?

The LM3S817-IQN50-C2 operates at a maximum system clock frequency of 50 MHz, achieved using its on-chip PLL with external crystal or internal oscillator input. This speed is factory-trimmed and guaranteed across the full industrial temperature range (–40°C to +85°C). The LM3S817-IQN50-C2 delivers consistent 50 MHz performance without requiring external clock synthesis circuitry.

Does the LM3S817-IQN50-C2 include an integrated voltage regulator?

Yes, the LM3S817-IQN50-C2 integrates a low-dropout (LDO) regulator that generates the 1.2 V core supply from the 3.3 V I/O supply (VDD). This eliminates the need for an external core regulator and simplifies power design. The LM3S817-IQN50-C2 datasheet specifies LDO output accuracy of ±3% and load regulation of <10 mV over full temperature and load conditions.

How many analog-to-digital converter channels does the LM3S817-IQN50-C2 support?

The LM3S817-IQN50-C2 features a single 10-bit ADC with eight input channels (ADC0CH0 through ADC0CH7), configurable as single-ended or differential pairs. It supports hardware sample averaging (up to 64 samples per conversion) and includes an internal temperature sensor. All channels share the same ADC module and are accessed via the same register set in the LM3S817-IQN50-C2 peripheral memory map.

Is the LM3S817-IQN50-C2 pin-compatible with other Stellaris devices?

The LM3S817-IQN50-C2 uses a 100-pin LQFP package with pin assignments matching the LM3S811, LM3S812, and LM3S818 within the same Stellaris LM3S8xx family. However, peripheral enablement and signal mapping differ across variants - for example, LM3S818 adds CAN, while LM3S817 omits it. Direct replacement requires verification of peripheral usage against the LM3S817-IQN50-C2 signal table.

What debug interfaces are supported by the LM3S817-IQN50-C2?

The LM3S817-IQN50-C2 supports both JTAG and Serial Wire Debug (SWD) interfaces via dedicated pins (TCK, TMS, TDI, TDO, nTRST, and SWDIO/SWCLK). SWD mode is enabled by default on reset and provides reduced pin count debugging. The LM3S817-IQN50-C2 implements ARM CoreSight debug architecture compliant with ARM Debug Interface v5.0.