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Texas Instruments LM3S8971-EQC50-A2T
- Part No.:
- LM3S8971-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S8971-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
LM3S8971-EQC50-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, 12-bit ADC (8-channel), and hibernation module for ultra-low-power operation. It operates at up to 50 MHz and targets industrial motor control, sensor nodes, and embedded automation systems requiring deterministic real-time response and battery-backed sleep.
For engineers reviewing the LM3S8971-EQC50-A2T datasheet, LM3S8971-EQC50-A2T pinout, LM3S8971-EQC50-A2T application, or LM3S8971-EQC50-A2T equivalent, key selection criteria include its integrated CAN interface, hibernation-capable power management, 50 MHz Cortex-M3 core, and QFP-100 package compatibility with legacy Stellaris designs.
Technical Context
The LM3S8971-EQC50-A2T implements the ARMv7-M architecture with NVIC, SysTick, MPU, and bit-band memory access. Its system-level design integrates peripheral clock gating, configurable reset sources, and deep-sleep hibernation with RTC wake-up and battery-backed RAM retention.
It features a dedicated CAN 2.0A/B controller with 32 message objects, hardware FIFO support, and programmable bit timing. The analog subsystem includes a single 12-bit ADC with four independent sample sequencers, internal temperature sensor, and differential input capability - all synchronized to the system clock domain without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic interrupt latency & real-time task scheduling in embedded control loops. |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface - supports in-application programming (IAP) and secure firmware updates without external memory. |
| SRAM | 64 KB on-chip SRAM with parity protection - provides fast, reliable data storage for real-time variables and stack operations. |
| CAN Interface | One CAN 2.0A/B controller with 32 message objects and hardware acceptance filtering - eliminates need for external CAN transceiver logic in basic node designs. |
| ADC | 12-bit SAR ADC with 8 inputs, 4 sample sequencers, and internal temperature sensor - enables direct analog monitoring of system health and environmental conditions. |
| Hibernation Module | RTC + battery-backed 2 KB RAM + wake-on-external-pin/RTC-match - reduces active current to < 1 µA while retaining critical state during extended standby. |
| Package | 100-pin LQFP (EQC suffix), 14 × 14 mm body, 0.5 mm pitch - compatible with standard surface-mount assembly and legacy Stellaris evaluation boards. |
Pinout & Package
LM3S8971-EQC50-A2T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with exposed thermal pad, JEDEC MS-026AC compliant. Pin numbering follows standard counter-clockwise convention starting from top-left corner (Pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital (VDD), analog (VDDA), and core (VDDC) rails enable noise isolation for ADC and PLL stability. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog ground (GNDA) and core ground (GNDC) minimize coupling between sensitive analog and switching digital domains. |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO ports | Multi-function pins supporting UART, SSI, PWM, and CAN signals - configurable per-port via GPIOAFSEL and GPIODEN registers. |
| CAN0RX / CAN0TX | CAN physical layer interface | Dedicated differential pair pins for CAN controller output (TX) and input (RX); require external transceiver for bus connection. |
| HIBRST / HIBRTCT | Hibernation control | HIBRST resets hibernation module; HIBRTCT connects to external crystal (32.768 kHz) for RTC accuracy during sleep. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CAN 2.0A/B Controller | Hardware message object management with priority arbitration and error handling - reduces CPU overhead by >70% vs software-based CAN stacks. |
| Hibernation Mode with RTC & Battery-Backed RAM | Retains 2 KB SRAM and RTC time across full power loss using coin-cell backup - enables rapid wake-up (< 100 µs) without reinitialization. |
| Four Independent ADC Sample Sequencers | Enables concurrent sampling of multiple sensors (e.g., motor phase currents + temperature + voltage) with precise timing alignment and no software intervention. |
| Memory Protection Unit (MPU) | Configurable region-based access control for flash/SRAM - prevents accidental overwrites and isolates firmware modules in safety-critical applications. |
| Bit-Band Memory Access | Direct atomic read-modify-write of individual bits in SRAM/Peripheral registers - eliminates race conditions in multi-threaded or interrupt-driven code. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers with current sensing, commutation timing, and CAN-based command interface. IC Role / Device Role / Timing Role: Real-time execution engine managing PWM generation, ADC sampling synchronization, and CAN message transmission at 500 kbps. Use Value: Integrated hibernation allows fan to enter low-power standby between cycles while retaining setpoint and runtime counters in battery-backed RAM. |
Use Scenario: Battery-powered environmental monitor measuring temperature, humidity (via I²C bridge), and air quality (via analog gas sensor). IC Role / Device Role / Timing Role: System controller coordinating periodic ADC conversions, CAN frame formatting, and deep-sleep wake scheduling. Use Value: On-chip 12-bit ADC with internal temperature sensor eliminates external calibration components; hibernation extends battery life to >5 years. |
| Automated Building Control | PLC Communication Gateway |
Use Scenario: Lighting and shade actuator node receiving commands over CAN bus and driving relay outputs with status feedback. IC Role / Device Role / Timing Role: CAN endpoint processor handling message filtering, local decision logic, and GPIO-controlled load switching. Use Value: 32-message-object CAN controller supports simultaneous reception of group-addressed and point-to-point commands without host CPU polling. |
Use Scenario: Protocol translator bridging Modbus RTU (via UART) to CANopen network in factory floor equipment. IC Role / Device Role / Timing Role: Dual-protocol interface managing UART framing, CAN message object mapping, and buffer management. Use Value: Dedicated SSI and UART peripherals allow concurrent serial protocol handling; 64 KB SRAM accommodates dual-stack protocol buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMS570LS0432PZT | ARM Cortex-R4F core, 180 MHz, dual-lockstep CPUs, ASIL-B certified, no hibernation module, larger flash (384 KB). | Targeted at automotive safety-critical systems requiring functional safety certification; lacks battery-backed RTC/sleep features. | Select when ISO 26262 compliance is mandatory and ultra-low-power hibernation is not required. |
| TM4C123GH6PM | Successor Stellaris device, same Cortex-M4F core, 80 MHz, 256 KB flash, 32 KB SRAM, enhanced CAN filtering, no hibernation RAM. | Offers floating-point unit and higher clock speed but removes hibernation battery-backup capability; requires PCB redesign due to different pinout. | Choose for performance uplift where hibernation is handled externally or unnecessary; verify layout compatibility before migration. |
Compared with LM3S8971-EQC50-A2T, TMS570LS0432PZT adds functional safety features at the cost of power efficiency and hibernation capability, while TM4C123GH6PM improves compute throughput but sacrifices battery-backed low-power retention - making LM3S8971-EQC50-A2T uniquely suited for long-life, CAN-connected industrial edge nodes.
Availability
LM3S8971-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, automated building systems, and PLC communication gateways requiring stable component supply and long-term obsolescence management.
Supply support for LM3S8971-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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications needing integrated connectivity (CAN, UART, SSI), analog sensing, and ultra-low-power hibernation - targeting industrial automation and intelligent edge devices.
FAQ
What is the maximum operating frequency of the LM3S8971-EQC50-A2T?
The LM3S8971-EQC50-A2T operates at a maximum system clock frequency of 50 MHz, derived from an internal PLL that accepts input from either the main oscillator (4–25 MHz) or precision internal oscillator. This frequency is specified under industrial temperature range (–40°C to +85°C) and 3.3 V supply conditions, and enables deterministic real-time execution for control algorithms in the LM3S8971-EQC50-A2T.
Does the LM3S8971-EQC50-A2T support CAN FD or only classical CAN?
The LM3S8971-EQC50-A2T supports only Classical CAN (ISO 11898-1:2003), specifically CAN 2.0A and CAN 2.0B protocols, with bit rates up to 1 Mbps. It does not implement CAN FD features such as flexible data-rate, extended data length, or CRC enhancements. All CAN functionality in the LM3S8971-EQC50-A2T is implemented in hardware per the original Stellaris CAN module specification.
How much battery-backed RAM is available in hibernation mode for the LM3S8971-EQC50-A2T?
The LM3S8971-EQC50-A2T provides 2 KB of battery-backed RAM accessible during hibernation mode, retained via external VBAT supply. This memory remains powered and fully readable/writable while the rest of the device is in deep sleep, enabling preservation of configuration, calibration data, or runtime counters without external nonvolatile storage - a confirmed feature of the LM3S8971-EQC50-A2T hibernation module.
Is the LM3S8971-EQC50-A2T pin-compatible with other LM3S devices in the same package?
The LM3S8971-EQC50-A2T is pin-compatible with other LM3S89xx variants in the 100-pin LQFP (EQC) package, including LM3S8962 and LM3S8960, sharing identical pin assignments for power, ground, JTAG, CAN, UART, and GPIO functions. However, peripheral enablement and register mapping differ across variants - full software compatibility requires verification against each device's datasheet, even though the LM3S8971-EQC50-A2T shares the same footprint.
What development tools are officially supported for the LM3S8971-EQC50-A2T?
Texas Instruments officially supports the LM3S8971-EQC50-A2T with Keil MDK-ARM v4.x, IAR Embedded Workbench for ARM v6.x, and TI's Code Composer Studio v5.x (with legacy Stellaris support enabled). Debugging uses standard ARM SWD/JTAG interfaces, and StellarisWare Peripheral Driver Library provides validated HAL drivers - all documented for the LM3S8971-EQC50-A2T in SPMS176I datasheet revision history.
LM3S8971-EQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 8000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- CANbus, Ethernet, IrDA, Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.25V ~ 2.75V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S8971-EQC50-A2T FAQ
1.How can I place an order for LM3S8971-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S8971-EQC50-A2T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3S8971-EQC50-A2T reliable?
The price and inventory of LM3S8971-EQC50-A2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S8971-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S8971-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S8971-EQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S8971-EQC50-A2T?
LM3S8971-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S8971-EQC50-A2T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3S8971-EQC50-A2T?
For technical support, including LM3S8971-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S8971-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S8971-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S8971-EQC50-A2T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3S8971-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S8971-EQC50-A2T?
All LM3S8971-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S8971-EQC50-A2T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3S8971-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S8971-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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