Texas Instruments LM3S1918-EQC50-A2T

Overview

LM3S1918-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (8-channel), dual UARTs, I²C, SSI, and PWM peripherals. It operates at up to 50 MHz and supports industrial temperature range (–40°C to +105°C) in a 100-pin LQFP package. Used in motor control, sensor hubs, and programmable logic controllers.

For engineers reviewing the LM3S1918-EQC50-A2T datasheet, LM3S1918-EQC50-A2T pinout, LM3S1918-EQC50-A2T application, or LM3S1918-EQC50-A2T equivalent, key selection criteria include Cortex-M3 core compatibility, hibernation-enabled low-power operation, on-chip analog peripherals, and industrial-grade thermal performance.

Technical Context

The LM3S1918-EQC50-A2T integrates an ARM Cortex-M3 processor core with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It features a dedicated hibernation module with battery-backed RTC and RAM, enabling sub-µA sleep current while retaining real-time clock and 2 KB of memory.

Peripherals include two UARTs supporting IrDA/SIR, one I²C master/slave interface, two SSI modules for SPI/SSI/Microwire, eight-channel 12-bit ADC with hardware averaging, four general-purpose timers (two 32-bit, two 16-bit), and analog comparators with internal reference. All are directly memory-mapped and accessible via APB bus.

Key Specifications

Pinout & Package

LM3S1918-EQC50-A2T is housed in a 100-pin LQFP package (Pb-free, RoHS-compliant) with exposed thermal pad. Pin assignments support multiplexed GPIO, peripheral functions, power domains (VDD/VDDA/VDDC/VBAT), and debug interfaces (SWD/JTAG).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S1918-EQC50-A2T provides unique hibernation-domain power management and industrial temperature resilience without requiring external RTC or backup circuitry - critical for unattended remote sensor nodes and fail-safe control systems.

Availability

LM3S1918-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controllers, and energy monitoring gateways requiring stable component supply and long-term lifecycle support.

Supply support for LM3S1918-EQC50-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 digital signal processing technologies.

The Stellaris LM3S product line was designed specifically for cost-sensitive, high-reliability industrial and building automation applications requiring deterministic real-time performance, low-power hibernation, and integrated analog peripherals - before the transition to the TM4C series.

FAQ

What is the maximum operating frequency of the LM3S1918-EQC50-A2T?

The LM3S1918-EQC50-A2T operates at a maximum system clock frequency of 50 MHz. This is achieved using the internal PLL with an external crystal (4–25 MHz) or internal oscillator. The Cortex-M3 core executes instructions at this rate with zero wait states for both flash and SRAM access, ensuring deterministic real-time behavior essential for motor control and PLC applications. The LM3S1918-EQC50-A2T does not support overclocking beyond 50 MHz per TI's production specifications.

Does the LM3S1918-EQC50-A2T support JTAG debugging?

Yes, the LM3S1918-EQC50-A2T supports standard IEEE 1149.1 JTAG debugging via TCK, TMS, TDI, TDO, and TRST pins. However, Texas Instruments also implements Serial Wire Debug (SWD) using SWCLK and SWDIO pins - a two-wire alternative that reduces pin count and is fully supported by TI's Code Composer Studio and third-party tools like OpenOCD. The LM3S1918-EQC50-A2T datasheet confirms full JTAG TAP controller compliance and SWD fallback capability.

What is the purpose of the VBAT pin on the LM3S1918-EQC50-A2T?

The VBAT pin on the LM3S1918-EQC50-A2T supplies power to the hibernation module's dedicated domain, enabling retention of the 2 KB hibernate RAM and operation of the real-time clock (RTC) during main power loss. When VBAT is connected to a coin cell or supercapacitor, the LM3S1918-EQC50-A2T maintains timekeeping and critical state data while drawing less than 1 µA. This feature is integral to the LM3S1918-EQC50-A2T's design for battery-backed industrial telemetry and fail-safe control recovery.

Can the LM3S1918-EQC50-A2T operate in extended temperature ranges?

Yes, the LM3S1918-EQC50-A2T is rated for industrial temperature operation from –40°C to +105°C. This specification is validated per TI's production test flow and documented in the official LM3S1918 datasheet (SPMS033I, Rev I). The device uses temperature-compensated oscillators and process-trimmed analog blocks to maintain ADC accuracy and timing stability across this range - making the LM3S1918-EQC50-A2T suitable for deployment in harsh environments such as factory floors, outdoor metering, and transportation infrastructure.

How many UART peripherals does the LM3S1918-EQC50-A2T include?

The LM3S1918-EQC50-A2T includes two independent UART peripherals, each with full-duplex operation, 16-byte transmit/receive FIFOs, programmable baud rates (up to 3 Mbps), and integrated IrDA/SIR encoding/decoding. Both UARTs support hardware flow control, modem control signals, and loopback testing. These UARTs are used in the LM3S1918-EQC50-A2T for simultaneous communication with host interfaces and fieldbus devices - for example, one UART for Modbus RTU over RS-485 and another for debug console or BLE module control.