Texas Instruments LM3S2918-EQC50-A2

Overview

LM3S2918-EQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated CAN 2.0A/B controller, 12-bit 1-MSPS ADC (8-channel), and dual UARTs with IrDA support. It operates at 50 MHz and targets industrial motor control and embedded automation systems requiring real-time communication and analog sensing.

For engineers reviewing the LM3S2918-EQC50-A2 datasheet, LM3S2918-EQC50-A2 pinout, LM3S2918-EQC50-A2 application, or LM3S2918-EQC50-A2 equivalent, key selection criteria include its integrated CAN interface, hibernation module with RTC and battery-backed memory, 50 MHz operation under industrial temperature range (–40°C to +105°C), and QFP-100 package compatibility with legacy Stellaris designs.

Technical Context

The LM3S2918-EQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. Its peripheral set includes a hibernation module supporting RTC wake-up and battery-backed SRAM retention, plus a dedicated CAN controller compliant with ISO 11898-1.

It integrates dual UARTs with hardware flow control and SIR encoding, an 8-channel 12-bit ADC with sample sequencers and hardware averaging, and four 32/16-bit general-purpose timers-two supporting PWM and one configurable as RTC-enabling precise timing in motor feedback loops and sensor sampling.

Key Specifications

Pinout & Package

LM3S2918-EQC50-A2 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, JEDEC MS-026AC compliant. Pinout supports multiplexed GPIO, dedicated JTAG/SWD debug, CANH/CANL differential pair, and separate VDDA/VSSA for analog noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C123GH6PM and STM32F103VET6, the LM3S2918-EQC50-A2 offers unique hibernation-with-RTC functionality and mature StellarisWare driver library support, making it optimal for legacy-replacement CAN nodes requiring guaranteed low-power retention without redesigning power architecture.

Availability

LM3S2918-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and programmable logic controller I/O modules requiring stable component supply and long-term obsolescence management.

Supply support for LM3S2918-EQC50-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, specializing in analog, embedded processing, and wireless technologies with leadership in industrial, automotive, and enterprise applications.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring integrated communication (CAN, UART, I2C), analog sensing, and deterministic control - targeting industrial automation, building systems, and automotive subsystems before the TM4C transition.

FAQ

What is the maximum operating frequency of the LM3S2918-EQC50-A2?

The LM3S2918-EQC50-A2 operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This frequency is specified across the full industrial temperature range (–40°C to +105°C) and supports deterministic interrupt response times critical for motor control loops. The LM3S2918-EQC50-A2 achieves this performance using the ARM Cortex-M3 core with tightly coupled memory interfaces and zero-wait-state flash execution.

Does the LM3S2918-EQC50-A2 support CAN FD or only classical CAN?

The LM3S2918-EQC50-A2 supports only classical CAN 2.0A/B protocols - it does not implement CAN FD features such as flexible data-rate or extended payload length. Its CAN controller complies fully with ISO 11898-1 and supports bit rates up to 1 Mbps with programmable timing quanta. For CAN FD requirements, designers should consider newer TI devices like the TM4C129x series or third-party alternatives. The LM3S2918-EQC50-A2 remains appropriate for legacy CAN networks in industrial and automotive domains.

Is there an internal temperature sensor in the LM3S2918-EQC50-A2?

Yes, the LM3S2918-EQC50-A2 includes an internal temperature sensor connected to ADC channel 0, calibrated to ±3°C accuracy across –40°C to +105°C. It requires no external components and is accessible via the ADC sequencer with automatic sampling and conversion. This feature enables on-chip thermal monitoring for motor drivers or power supplies without adding discrete sensors. The LM3S2918-EQC50-A2 firmware can read temperature values directly using StellarisWare API calls like ADCSequenceDataGet().

What debug interface does the LM3S2918-EQC50-A2 use?

The LM3S2918-EQC50-A2 uses a 5-pin JTAG interface (TCK, TMS, TDI, TDO, nTRST) compliant with IEEE 1149.1, supporting full boundary-scan, flash programming, and real-time debugging. SWD (Serial Wire Debug) is not supported - only JTAG is implemented. Debug tools such as TI's ICDI-based LaunchPad debuggers or third-party JTAG emulators (e.g., Segger J-Link) are compatible. The LM3S2918-EQC50-A2 also includes hardware breakpoints and watchpoints managed by the Cortex-M3's debug architecture.

Can the LM3S2918-EQC50-A2 operate without an external crystal?

Yes, the LM3S2918-EQC50-A2 can operate using its internal 6 MHz RC oscillator for basic functionality, though this limits precision timing and disables features requiring accurate clocks - such as CAN bit timing, UART baud rate stability, and RTC operation. For production use, an external 8–25 MHz crystal is recommended for main system clock, and a 32.768 kHz crystal is required for hibernation-mode RTC. The LM3S2918-EQC50-A2 supports both configurations via clock configuration registers in the System Control module.