Texas Instruments LM3S2739-IBZ50-A2T

Overview

LM3S2739-IBZ50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated CAN 2.0A/B controller, dual 10-bit ADC (up to 1 MSPS), and hibernation module supporting RTC and battery-backed memory - deployed in industrial motor control and embedded automation systems requiring deterministic real-time response.

For engineers reviewing the LM3S2739-IBZ50-A2T datasheet, LM3S2739-IBZ50-A2T pinout, LM3S2739-IBZ50-A2T application, or LM3S2739-IBZ50-A2T equivalent, key selection criteria include its 50 MHz CPU clock, hibernation current of 1.8 µA, CAN interface compliance, dual ADC sample sequencing, and QFP-100 package compatibility with industrial temperature range (-40°C to +85°C).

Technical Context

The LM3S2739-IBZ50-A2T implements the ARMv7-M architecture with nested vectored interrupt controller (NVIC), memory protection unit (MPU), and SysTick timer - enabling deterministic interrupt latency under 12 cycles. Its hibernation module integrates a 32-bit RTC, battery-backed 2 KB SRAM, and wake-up sources including external pins and RTC match events.

Peripherals include two UARTs with IrDA support, two SSI modules, one I²C master/slave interface, and a dedicated CAN 2.0A/B controller with 32 message objects and programmable FIFO buffering - all accessible via APB bus with configurable clock gating for power optimization.

Key Specifications

Pinout & Package

LM3S2739-IBZ50-A2T is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per TI SPMS054I datasheet Rev I (July 2014), with dedicated JTAG/SWD debug pins, CANH/CANL differential pair, and dual ADC input banks mapped to Port A and Port E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S2739-IBZ50-A2T, the LM3S2678-IBZ50-A2T trades CAN and ADC capability for lower cost, while TM4C123GH6PM offers USB, CAN FD, and extended support - making LM3S2739-IBZ50-A2T optimal for CAN-dependent industrial control where legacy compatibility and proven reliability are prioritized.

Availability

LM3S2739-IBZ50-A2T is available at Aetrix Electronics and suitable for industrial motor control, remote sensor nodes, PLC I/O modules, and factory automation gateways requiring stable component supply and long-term obsolescence management.

Supply support for LM3S2739-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 specializing in analog, embedded processing, and wireless technologies - serving industrial, automotive, and consumer markets since 1930.

The Stellaris LM3S series was designed specifically for real-time industrial control applications demanding high integration, low-power hibernation, and deterministic peripheral response - with LM3S2739-IBZ50-A2T targeting CAN-based distributed automation systems.

FAQ

What is the maximum operating frequency of the LM3S2739-IBZ50-A2T?

The LM3S2739-IBZ50-A2T operates at a maximum CPU clock frequency of 50 MHz, as specified in the Texas Instruments SPMS054I datasheet. This frequency is achieved using the internal PLL with an external crystal or oscillator input, and all peripherals - including ADC, CAN, and timers - are fully functional at this speed without wait states. The LM3S2739-IBZ50-A2T maintains timing compliance across its industrial temperature range (–40°C to +85°C).

Does the LM3S2739-IBZ50-A2T support CAN FD?

No, the LM3S2739-IBZ50-A2T implements a CAN 2.0A/B controller compliant with ISO 11898-1:2003, supporting data rates up to 1 Mbps and standard/extended identifiers - but it does not support CAN FD features such as flexible data-rate switching or larger payload sizes. For CAN FD capability, TI recommends migrating to the TM4C123GH6PM, which retains pin compatibility and adds CAN FD support. The LM3S2739-IBZ50-A2T remains appropriate for legacy CAN 2.0 networks.

How much SRAM is available for application use in the LM3S2739-IBZ50-A2T?

LM3S2739-IBZ50-A2T provides 64 KB of on-chip SRAM, all accessible to the application without reservation for system use. Of this, 2 KB can be retained during hibernation mode when powered from VBAT, while the remaining 62 KB is active during normal operation. The memory map is contiguous and supports both stack and heap allocation, with MPU-enforced region protection available for safety-critical partitions. This SRAM capacity supports complex control algorithms and multi-protocol buffers in the LM3S2739-IBZ50-A2T.

What debug interfaces does the LM3S2739-IBZ50-A2T support?

The LM3S2739-IBZ50-A2T supports both JTAG and SWD (Serial Wire Debug) interfaces via dedicated pins (TCK, TMS, TDI, TDO, nSRST), enabling full-speed debugging, flash programming, and real-time trace using compatible tools like TI's ICDI-based LaunchPads or third-party J-Link adapters. SWD mode uses only two pins (SWDIO and SWCLK), reducing PCB routing complexity versus full JTAG. All debug functionality is implemented in silicon and requires no application firmware overhead - a key feature of the LM3S2739-IBZ50-A2T.

Is the LM3S2739-IBZ50-A2T still in production and supported by Texas Instruments?

Texas Instruments has discontinued marketing and new design-in support for the LM3S2739-IBZ50-A2T, with official product change notices issued in 2016. However, Aetrix Electronics maintains active inventory and extended lifecycle sourcing for this part, including traceable lots and full documentation (SPMS054I datasheet, StellarisWare driver library). The LM3S2739-IBZ50-A2T remains suitable for repair, replacement, and legacy production - backed by TI's original warranty terms and qualification data.