Texas Instruments LM3S8970-EQC50-A2

Overview

LM3S8970-EQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated CAN, UART, I2C, SSI, and hibernation module. It operates at 50 MHz, supports 3.3 V supply, and targets low-power industrial control and embedded networking applications.

For engineers reviewing the LM3S8970-EQC50-A2 datasheet, LM3S8970-EQC50-A2 pinout, LM3S8970-EQC50-A2 application, or LM3S8970-EQC50-A2 equivalent, key selection considerations include its 50 MHz Cortex-M3 core, on-chip CAN 2.0B controller, hibernation mode with RTC and battery-backed memory, and QFP-100 package compatibility for space-constrained industrial designs.

Technical Context

The LM3S8970-EQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. It integrates a dedicated hibernation module with RTC, battery-backed RAM, and wake-on-external-event capability - enabling sub-5 µA deep-sleep operation.

Its peripheral set includes one CAN 2.0B controller, two UARTs (one with IrDA/SIR), two SSI interfaces, one I2C master/slave, three 16/32-bit general-purpose timers, and a watchdog timer - all clocked from a programmable PLL-driven system clock up to 50 MHz.

Key Specifications

Pinout & Package

LM3S8970-EQC50-A2 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, designated EQC by Texas Instruments. Pin functions are multiplexed across GPIO banks A–G and dedicated peripheral pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S8970-EQC50-A2, LM3S811-EQC50-A2 offers reduced memory and hibernation capacity at lower cost, while TM4C123GH6PM delivers higher clock speed, USB, and modern toolchain support - but mandates layout changes and firmware migration.

Availability

LM3S8970-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, building automation nodes, energy metering endpoints, and remote monitoring terminals requiring stable component supply and long-term obsolescence management.

Supply support for LM3S8970-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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The Stellaris LM3S series was designed as the first ARM Cortex-M3-based microcontroller family for cost-sensitive, low-power industrial and embedded applications - prioritizing integration, hibernation efficiency, and CAN-ready fieldbus support.

FAQ

What is the maximum operating frequency of the LM3S8970-EQC50-A2?

The LM3S8970-EQC50-A2 operates at a maximum system clock frequency of 50 MHz, achieved using its internal PLL with an external crystal or precision internal oscillator. This frequency applies to both the CPU core and most peripherals, enabling real-time response in motor control and communication tasks. The LM3S8970-EQC50-A2 maintains full functionality-including flash access, GPIO toggling, and peripheral operation-at this rated speed under specified voltage and temperature conditions.

Does the LM3S8970-EQC50-A2 support CAN FD or only classical CAN?

The LM3S8970-EQC50-A2 supports only Classical CAN (CAN 2.0B), not CAN FD. Its integrated CAN controller complies with ISO 11898-1:2003 and supports bit rates up to 1 Mbps with programmable timing registers. CAN FD features such as flexible data-length and higher bit rates are absent; the LM3S8970-EQC50-A2 does not implement the CAN FD protocol stack or extended frame format. For CAN FD requirements, consider newer TI families like the TM4C129x or C2000 Delfino series.

How much battery-backed memory does the LM3S8970-EQC50-A2 provide in hibernate mode?

The LM3S8970-EQC50-A2 provides 2 KB of battery-backed SRAM accessible during hibernate mode, retained via the Hibernation Module using an external VBAT supply. This memory remains powered and readable/writable while the main domain is fully powered down, supporting critical state storage and RTC alarm logging. The LM3S8970-EQC50-A2 also includes a 32-bit RTC counter and match register within the same module, enabling time-triggered wake-up events without external components.

Is the LM3S8970-EQC50-A2 pin-compatible with other LM3S devices in the EQC package?

The LM3S8970-EQC50-A2 shares the same 100-pin LQFP (EQC) mechanical footprint with several other LM3S devices, including LM3S811-EQC50-A2 and LM3S3748-EQC50-A2, but pin functions are not fully interchangeable due to differing peripheral sets and GPIO mappings. While power, ground, and basic clock pins align, peripheral-specific pins (e.g., CAN, SSI, or Ethernet) vary significantly. The LM3S8970-EQC50-A2 requires its own validated schematic and layout - it is not a drop-in replacement for other EQC-packaged LM3S parts without design review.

What development tools and software support are available for the LM3S8970-EQC50-A2?

Texas Instruments provided full support for the LM3S8970-EQC50-A2 through StellarisWare Peripheral Driver Library, Code Composer Studio v5–6, and IAR Embedded Workbench. Hardware tools included the Stellaris DK-LM3S9B96 and In-Circuit Debug Interfaces (ICDI) via JTAG/SWD. Though TI discontinued active development after transitioning to Tiva C Series, legacy StellarisWare drivers and CMSIS-compliant startup code remain publicly available. The LM3S8970-EQC50-A2 continues to be supported in production environments with verified toolchains and documented porting paths to TM4C.