Texas Instruments LM3S1958-IQC50-A2T

Overview

LM3S1958-IQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (1 MSPS), and dual UARTs + I²C + SSI interfaces. It operates at 50 MHz and supports industrial temperature range (–40°C to +85°C) in 100-pin LQFP package. Used in motor control, industrial automation, and sensor interface systems requiring low-power operation with real-time responsiveness.

For engineers reviewing the LM3S1958-IQC50-A2T datasheet, LM3S1958-IQC50-A2T pinout, LM3S1958-IQC50-A2T application, or LM3S1958-IQC50-A2T equivalent, key selection criteria include its hibernation-capable power management, integrated RTC with battery-backed memory, 12-bit ADC sampling rate, and support for multiple serial protocols without external transceivers.

Technical Context

The LM3S1958-IQC50-A2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC-based interrupt handling, and bit-band memory access. It integrates a hibernation module with RTC, battery-backed RAM, and wake-up on external event or time match - enabling sub-μA sleep current.

Peripherals include two UARTs (one with IrDA/SIR), one I²C master/slave, one SSI controller, eight PWM-capable GPIOs, and a 12-channel 12-bit ADC with hardware averaging and temperature sensor. Clock system supports PLL-based 50 MHz operation from internal oscillator or external crystal.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VET6, the LM3S1958-IQC50-A2T uniquely provides hibernation-optimized power architecture with battery-backed RAM and calendar RTC - critical for energy-constrained applications where sub-μA sleep and autonomous wake-up are mandatory design requirements.

Availability

LM3S1958-IQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controllers, and human-machine interfaces requiring stable component supply across extended product lifecycles.

Supply support for LM3S1958-IQC50-A2T 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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring high integration, low power, and deterministic interrupt response - targeting industrial automation, building controls, and sensor fusion systems.

FAQ

What is the maximum operating frequency of the LM3S1958-IQC50-A2T?

The LM3S1958-IQC50-A2T operates at a maximum system clock frequency of 50 MHz, achieved via its integrated PLL that multiplies the input clock (from internal oscillator or external crystal). This frequency is specified across the full industrial temperature range (–40°C to +85°C) and 3.3 V supply, ensuring deterministic real-time performance in demanding environments. The LM3S1958-IQC50-A2T's Cortex-M3 core executes Thumb-2 instructions at this rate with single-cycle GPIO toggling and sub-100 ns interrupt latency.

Does the LM3S1958-IQC50-A2T support hibernation mode with RTC functionality?

Yes, the LM3S1958-IQC50-A2T integrates a dedicated hibernation module with a calendar-based real-time clock (RTC), 2 KB of battery-backed SRAM, and wake-up capability from GPIO or RTC match events. In hibernation mode, it draws as little as 1.5 μA (typical) while retaining timekeeping and critical configuration data. The LM3S1958-IQC50-A2T's hibernation module is fully autonomous and does not require CPU intervention to maintain time or respond to wake triggers.

What ADC capabilities does the LM3S1958-IQC50-A2T provide?

The LM3S1958-IQC50-A2T features a 12-bit successive-approximation ADC with 12 input channels, 1 MSPS sampling rate, and hardware-supported sample averaging (2–64 samples). It includes an internal temperature sensor calibrated to ±3°C accuracy and supports both single-ended and differential acquisition modes. The ADC operates independently of CPU load, with sequencer-triggered conversions and DMA-ready results - all confirmed in the LM3S1958-IQC50-A2T datasheet Section 11.

Which serial communication interfaces are integrated into the LM3S1958-IQC50-A2T?

The LM3S1958-IQC50-A2T integrates two UARTs (one supporting IrDA/SIR), one I²C master/slave interface, and one SSI controller compatible with SPI, Microwire, and TI synchronous serial protocols. All interfaces feature FIFO buffering, programmable baud rates, and interrupt/DMA support. These peripherals are mapped to specific GPIO pins in the 100-pin LQFP package and are fully register-configurable - as documented in LM3S1958-IQC50-A2T Sections 12–14 of the datasheet.

Is the LM3S1958-IQC50-A2T pin-compatible with other Stellaris LM3S devices?

No, the LM3S1958-IQC50-A2T is not universally pin-compatible across the Stellaris LM3S family. While it shares the 100-pin LQFP footprint with certain variants (e.g., LM3S8962), signal assignments differ significantly - especially for ADC, PWM, and peripheral function mapping. Pin compatibility must be verified per device using the Signal Tables (Section 16.1) in the LM3S1958-IQC50-A2T datasheet; no generic pin-to-pin replacement is guaranteed without board-level validation.