Texas Instruments LM3S1165-IBZ50-A2T

Overview

LM3S1165-IBZ50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 8-channel 12-bit ADC, and dual UART/I²C/SSI peripherals. It operates at up to 50 MHz and supports real-time motor control, industrial sensing, and low-power embedded applications.

For engineers reviewing the LM3S1165-IBZ50-A2T datasheet, LM3S1165-IBZ50-A2T pinout, LM3S1165-IBZ50-A2T application, or LM3S1165-IBZ50-A2T equivalent, key selection considerations include hibernation-capable power management, on-chip RTC with battery-backed memory, and integrated analog comparators for fast event-triggered wake-up in energy-constrained systems.

Technical Context

The LM3S1165-IBZ50-A2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC with 64 interrupt lines, and SysTick timer. It integrates a hibernation module with RTC, battery-backed RAM (2 KB), and external wake-up capability via GPIO or RTC match.

Peripherals include an 8-channel 12-bit ADC with hardware averaging, two UARTs supporting IrDA/SIR, two I²C masters/slaves, two SSI controllers, and four general-purpose timers with PWM and input capture modes - all clocked from a configurable PLL-based system clock up to 50 MHz.

Key Specifications

Pinout & Package

LM3S1165-IBZ50-A2T 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 SPMS014I datasheet Section 5.1 and Figure 5–1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S1968-IBZ50-A2T and TM4C123GH6PM, the LM3S1165-IBZ50-A2T uniquely balances hibernation-optimized power efficiency, integrated analog sensing, and deterministic real-time control - making it optimal for cost-sensitive, battery-operated industrial endpoints where Ethernet or next-gen process nodes are unnecessary.

Availability

LM3S1165-IBZ50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and medical diagnostic handhelds requiring stable component supply and long-term obsolescence management.

Supply support for LM3S1165-IBZ50-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, specializing in analog, embedded processing, and wireless technologies since 1930.

The Stellaris LM3S series was designed specifically for cost-effective, high-integration 32-bit microcontroller applications in industrial automation, building control, and portable instrumentation - emphasizing low-power operation, analog integration, and real-time determinism.

FAQ

What is the maximum operating frequency of the LM3S1165-IBZ50-A2T?

The LM3S1165-IBZ50-A2T operates at a maximum system clock frequency of 50 MHz. This speed is achieved using an internal PLL that multiplies the input crystal or oscillator frequency. The 50 MHz rating is specified under industrial temperature range (–40°C to +85°C) and nominal 3.3 V supply conditions per the SPMS014I datasheet. All peripherals-including ADC, timers, and UARTs-are fully functional at this clock rate.

Does the LM3S1165-IBZ50-A2T support in-system programming via UART?

Yes, the LM3S1165-IBZ50-A2T supports in-system programming (ISP) through its UART0 or UART1 interface using the built-in ROM bootloader. This feature allows firmware updates without requiring JTAG or external programmers. The bootloader is activated by holding the appropriate GPIO pin low during reset and communicating via standard UART framing at configurable baud rates up to 1 Mbps - enabling field upgrades and manufacturing programming flexibility for the LM3S1165-IBZ50-A2T.

What is the purpose of the hibernation module in the LM3S1165-IBZ50-A2T?

The hibernation module in the LM3S1165-IBZ50-A2T provides ultra-low-power sleep mode with retained functionality: it includes a real-time clock (RTC), 2 KB of battery-backed RAM, and wake-up sources such as RTC alarm, external GPIO, or analog comparator output. When active, the module draws less than 1 µA from the backup supply (VDDC), allowing the LM3S1165-IBZ50-A2T to maintain time and critical state across extended power-loss periods - essential for battery-powered sensors and metering applications.

How many analog-to-digital converter (ADC) channels does the LM3S1165-IBZ50-A2T have, and what is its resolution?

The LM3S1165-IBZ50-A2T integrates a single 12-bit successive-approximation ADC with eight external input channels (AIN0–AIN7) and one internal temperature sensor channel. It supports programmable sample rates up to 1 MSPS and includes hardware averaging across up to 64 samples per conversion sequence. This ADC architecture enables high-fidelity analog acquisition for motor current sensing, environmental monitoring, and precision control loops in the LM3S1165-IBZ50-A2T.

Is the LM3S1165-IBZ50-A2T pin-compatible with other Stellaris LM3S devices?

No, the LM3S1165-IBZ50-A2T is not universally pin-compatible with other LM3S devices. While it shares the 100-pin LQFP package with several variants (e.g., LM3S1968), pin functions differ significantly - especially for hibernation signals (HIB, RTCCLK), USB interface pins, and peripheral mapping. The LM3S1165-IBZ50-A2T datasheet specifies unique pin assignments in Section 5.1 and Figure 5–1; direct substitution without board-level validation is not supported.