Texas Instruments LM3S6432-IBZ50-A2

Overview

LM3S6432-IBZ50-A2 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 control, motor drive, and networked sensor nodes requiring real-time deterministic execution and wired connectivity.

For engineers reviewing the LM3S6432-IBZ50-A2 datasheet, LM3S6432-IBZ50-A2 pinout, LM3S6432-IBZ50-A2 application, or LM3S6432-IBZ50-A2 equivalent, key selection criteria include its integrated 10/100 Ethernet MAC (no external PHY required), 50 MHz CPU clock, 256 KB on-chip flash with error correction, 32 KB SRAM, and support for deterministic interrupt latency under 12 clock cycles.

Technical Context

The LM3S6432-IBZ50-A2 implements the ARMv7-M architecture with Thumb-2 instruction set, nested vectored interrupt controller (NVIC) supporting 48 configurable interrupts, and memory protection unit (MPU) for secure task isolation. It integrates a system timer (SysTick), watchdog, and power management for sleep mode entry via WFI/WFE instructions.

Peripherals include a 10/100 Ethernet MAC with MII interface, two UARTs with IrDA/SIR support, one I²C master/slave, one SSI (SPI-compatible), eight-channel 10-bit ADC with hardware averaging, four general-purpose timers (two 32-bit, two 16-bit), and six PWM outputs derived from timer modules.

Key Specifications

Pinout & Package

LM3S6432-IBZ50-A2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per the TI LM3S6432 datasheet revision SPMS130J (July 2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S6432-IBZ50-A2, LM3S6965-IBZ50-A2 adds CAN and USB while retaining Ethernet MAC, making it suitable for multi-protocol industrial nodes; TM4C123GH6PM offers FPU and modern peripherals but removes integrated Ethernet, shifting PHY/MAC responsibility to external components.

Availability

LM3S6432-IBZ50-A2 is available at Aetrix Electronics and suitable for industrial automation, motor control, and embedded networking applications requiring stable component supply, long-term lifecycle support, and qualified production-grade silicon.

Supply support for LM3S6432-IBZ50-A2 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, embedded processing, and wireless technologies for industrial, automotive, and consumer markets.

The Stellaris LM3S family was designed as the first ARM Cortex-M3-based microcontroller line targeting cost-sensitive, real-time industrial and connectivity applications with integrated analog and communication peripherals.

FAQ

What is the maximum operating frequency of the LM3S6432-IBZ50-A2?

The LM3S6432-IBZ50-A2 operates at a maximum system clock frequency of 50 MHz. This is achieved using an internal PLL that multiplies the input crystal or oscillator frequency. The 50 MHz clock drives the Cortex-M3 core, peripherals, and memory subsystems with zero wait states for flash and SRAM access, enabling deterministic real-time performance critical for control applications.

Does the LM3S6432-IBZ50-A2 include an integrated Ethernet PHY?

No, the LM3S6432-IBZ50-A2 includes only an integrated 10/100 Ethernet MAC, not a PHY. It provides a standard MII interface with differential RX/TX signals (ETH0RX+/−, ETH0TX+/−) that must connect to an external PHY chip (e.g., DP83848) to complete the physical layer. This architecture allows design flexibility in selecting PHY features such as ESD rating, power consumption, or fiber vs. copper support.

What debug interfaces does the LM3S6432-IBZ50-A2 support?

The LM3S6432-IBZ50-A2 supports JTAG and SWD (Serial Wire Debug) interfaces for programming and debugging. Its Cortex-M3 core includes an Embedded Trace Macrocell (ETM) and Trace Port Interface Unit (TPIU), enabling instruction trace and real-time variable monitoring. Debug access uses dedicated pins (TCK, TMS, TDI, TDO, nTRST) in the 100-pin LQFP package, compatible with standard TI XDS debug probes and third-party JTAG adapters.

How much SRAM and flash memory does the LM3S6432-IBZ50-A2 have?

The LM3S6432-IBZ50-A2 integrates 32 KB of on-chip SRAM and 256 KB of on-chip flash memory. The SRAM operates at full 50 MHz with zero wait states and is used for runtime variables, stack, and heap. The flash includes built-in error correction code (ECC) and supports in-application programming (IAP), allowing firmware updates without external programming hardware - essential for field-deployed industrial devices.

Is the LM3S6432-IBZ50-A2 pin-compatible with other Stellaris LM3S devices?

The LM3S6432-IBZ50-A2 is pin-compatible with other 100-pin LQFP Stellaris devices in the LM3S6xxx series sharing the same IBZ suffix (e.g., LM3S6965-IBZ50-A2), as confirmed by TI's package compatibility documentation. However, peripheral register maps and feature sets differ across variants - for example, LM3S6965 adds CAN and USB controllers not present in LM3S6432-IBZ50-A2 - so software and schematic validation is required before substitution.