Texas Instruments LM3S811-IGZ50-C2T

Overview

LM3S811-IGZ50-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 256-byte EEPROM, and 8 KB SRAM, operating at up to 50 MHz. It integrates UART, I²C, SSI, ADC (8-channel, 10-bit), PWM, analog comparator, and GPIO peripherals-designed for real-time embedded control in industrial sensor nodes and motor drive interfaces.

For engineers reviewing the LM3S811-IGZ50-C2T datasheet, LM3S811-IGZ50-C2T pinout, LM3S811-IGZ50-C2T application, or LM3S811-IGZ50-C2T equivalent, key selection criteria include its 50 MHz CPU clock, integrated 10-bit ADC with temperature sensor, single UART with FIFO, and QFP-100 package compatibility for space-constrained industrial PCBs.

Technical Context

The LM3S811-IGZ50-C2T implements the ARMv7-M architecture with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It supports Thumb-2 instruction set, hardware divide, and bit-band addressing for efficient peripheral register access.

Its system-level design includes on-chip flash programming via JTAG or SWD, configurable clock sources (PIOSC, PLL, external crystal), and power management modes (sleep, deep-sleep) with wake-up on GPIO or peripheral interrupt-enabling low-power operation in battery-backed sensor applications.

Key Specifications

Pinout & Package

LM3S811-IGZ50-C2T uses a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C) and 3.3 V nominal supply.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S811-IGZ50-C2T, LM3S811-IQC50-C2T offers identical electrical behavior in a thermally optimized package, while TM4C123GH6PM delivers significant compute headroom and peripheral expansion-making it suitable for next-generation upgrades where cost and footprint allow.

Availability

LM3S811-IGZ50-C2T is available at Aetrix Electronics and suitable for industrial sensor nodes, motor drive interfaces, smart actuator controllers, and legacy protocol gateways requiring stable component supply and long-term obsolescence support.

Supply support for LM3S811-IGZ50-C2T 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 connectivity technologies for industrial, automotive, and consumer markets.

The Stellaris LM3S series was TI's first family of ARM Cortex-M3 microcontrollers, designed specifically for deterministic real-time control in resource-constrained industrial and automation systems-prioritizing low-latency interrupt response, integrated analog peripherals, and robust industrial-grade packaging.

FAQ

What is the maximum operating frequency of the LM3S811-IGZ50-C2T?

The LM3S811-IGZ50-C2T operates at a maximum system clock frequency of 50 MHz, achieved by configuring the internal PLL to multiply an external crystal or precision internal oscillator. This speed supports real-time control loops with sub-microsecond interrupt latency and sufficient throughput for UART, I²C, and SSI communication at typical industrial baud rates. The LM3S811-IGZ50-C2T maintains this rating across its full industrial temperature range (–40°C to +85°C).

Does the LM3S811-IGZ50-C2T include an internal temperature sensor?

Yes, the LM3S811-IGZ50-C2T integrates a factory-calibrated internal temperature sensor connected to ADC channel 0. It provides ±3°C accuracy over the –40°C to +85°C range and requires no external components. This sensor is accessible via the ADC hardware sequencer and can be used for thermal monitoring or compensation of analog measurements. The LM3S811-IGZ50-C2T datasheet specifies its transfer function and calibration constants in Section 10.3.7.

What debug interfaces does the LM3S811-IGZ50-C2T support?

The LM3S811-IGZ50-C2T supports JTAG (IEEE 1149.1) for full boundary-scan testing, flash programming, and real-time debugging via standard ARM-compliant tools such as TI's Code Composer Studio and third-party J-Link adapters. It does not support SWD (Serial Wire Debug); JTAG is the sole standardized debug interface. All required JTAG pins (TCK, TMS, TDI, TDO, nTRST) are assigned to dedicated package pins on the LM3S811-IGZ50-C2T LQFP-100 package.

Can the LM3S811-IGZ50-C2T operate from a single 3.3 V supply?

Yes, the LM3S811-IGZ50-C2T is designed for single 3.3 V nominal operation across all power domains (VDD, VDDA, VDDC). It includes internal regulators that generate required core and analog voltages, eliminating need for external LDOs. The device tolerates supply variations from 3.13 V to 3.63 V and features brown-out reset circuitry that asserts nRST if VDD drops below 2.8 V. This simplifies power design for the LM3S811-IGZ50-C2T in compact industrial PCBs.

Is there on-chip nonvolatile memory other than flash in the LM3S811-IGZ50-C2T?

Yes, the LM3S811-IGZ50-C2T includes 256 bytes of on-chip EEPROM, separate from its 64 KB main flash memory. This EEPROM is endurance-rated for 100,000 write cycles and supports byte-level erasure and programming. It is commonly used to store calibration data, device serial numbers, or configuration parameters that must survive power loss without relying on flash wear-leveling schemes. The LM3S811-IGZ50-C2T EEPROM is accessed via dedicated ROM API functions or direct register writes.