Texas Instruments LM3S6432-IBZ50-A2T

Overview

LM3S6432-IBZ50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated Ethernet MAC, dual UARTs, I²C, SSI, ADC (10-bit, 8-channel), PWM, and analog comparators. It operates at 50 MHz and targets industrial motor control and networked embedded systems.

For engineers reviewing the LM3S6432-IBZ50-A2T datasheet, LM3S6432-IBZ50-A2T pinout, LM3S6432-IBZ50-A2T application, or LM3S6432-IBZ50-A2T equivalent, key selection criteria include Ethernet MAC integration, 50 MHz CPU clock, 256 KB on-chip flash, 32 KB SRAM, and support for real-time motor control peripherals including PWM and analog comparators.

Technical Context

The LM3S6432-IBZ50-A2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC interrupt controller, SysTick timer, and MPU. It integrates a full Ethernet MAC (MII/RMII interface) without external PHY, enabling standalone wired connectivity in compact designs.

Peripherals include two UARTs with IrDA/SIR support, one I²C master/slave, one SSI (SPI-compatible), 8-channel 10-bit ADC with hardware averaging, four general-purpose timers (including RTC mode), and a dedicated PWM module with fault protection and dead-band generation-optimized for closed-loop motor drive applications.

Key Specifications

Pinout & Package

LM3S6432-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 SPMS130J datasheet Rev J.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S6432-IBZ50-A2T, LM3S6965-IBZ50-A2T trades Ethernet for USB and larger flash, while TM4C123GH6PM delivers higher performance and modern toolchain support-but requires layout and firmware migration effort.

Availability

LM3S6432-IBZ50-A2T is available at Aetrix Electronics and suitable for industrial motor control, networked PLC I/O modules, smart energy gateways, and building automation controllers requiring stable component supply and long-lifecycle support.

Supply support for LM3S6432-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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability and industrial-grade performance.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring integrated connectivity (Ethernet, USB, CAN), motor control peripherals, and deterministic ARM-based execution-targeting industrial automation and building systems.

FAQ

What is the maximum operating frequency of the LM3S6432-IBZ50-A2T?

The LM3S6432-IBZ50-A2T operates at a maximum CPU clock frequency of 50 MHz, as specified in the Texas Instruments SPMS130J datasheet. This frequency is achieved using the internal PLL driven from the main oscillator or external crystal. The 50 MHz rating applies across the full industrial temperature range (–40°C to +85°C) and ensures deterministic timing for real-time motor control loops and Ethernet frame processing in the LM3S6432-IBZ50-A2T.

Does the LM3S6432-IBZ50-A2T include an integrated Ethernet PHY?

No, the LM3S6432-IBZ50-A2T integrates only the Ethernet MAC layer-not the physical layer (PHY). It supports MII and RMII interfaces to connect externally to a standard 10/100 Mbps PHY chip such as the DP83848 or LAN8720. This architecture allows design flexibility in PHY selection while retaining the benefits of on-chip MAC logic, DMA, and descriptor management in the LM3S6432-IBZ50-A2T.

How much flash and SRAM memory does the LM3S6432-IBZ50-A2T provide?

The LM3S6432-IBZ50-A2T contains 256 KB of on-chip flash memory and 32 KB of SRAM. Flash is used for program storage, bootloader, and nonvolatile configuration data; SRAM serves as runtime memory for variables, stack, heap, and Ethernet frame buffers. Both memory blocks are tightly coupled to the Cortex-M3 core and accessible without wait states at 50 MHz, as confirmed in the LM3S6432-IBZ50-A2T datasheet section 6.

What analog peripherals are integrated into the LM3S6432-IBZ50-A2T?

The LM3S6432-IBZ50-A2T integrates an 8-channel, 10-bit analog-to-digital converter (ADC) with hardware sample averaging (up to 64 samples), an internal temperature sensor, and two analog comparators with programmable reference. These peripherals support real-time analog signal acquisition for motor current sensing, bus voltage monitoring, and thermal protection-functions critical in industrial drive applications where the LM3S6432-IBZ50-A2T is commonly deployed.

Is the LM3S6432-IBZ50-A2T pin-compatible with other Stellaris LM3S devices?

No, the LM3S6432-IBZ50-A2T is not universally pin-compatible with other LM3S devices. While it shares the 100-pin LQFP package with several variants (e.g., LM3S6965), differences in peripheral mapping-especially Ethernet RMII pins versus USB or CAN signals-mean PCB layout is not interchangeable. Pin compatibility must be verified per specific variant; the LM3S6432-IBZ50-A2T pinout is unique to its feature set and documented in the SPMS130J datasheet.