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Texas Instruments LM3S8971-EQC50-A2
- Part No.:
- LM3S8971-EQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S8971-EQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
LM3S8971-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 ADC (8-channel), and hibernation module supporting RTC and battery-backed memory. It operates at 50 MHz and targets industrial motor control and embedded automation systems requiring real-time communication and low-power operation.
For engineers reviewing the LM3S8971-EQC50-A2 datasheet, LM3S8971-EQC50-A2 pinout, LM3S8971-EQC50-A2 application, or LM3S8971-EQC50-A2 equivalent, key selection criteria include CAN interface support, hibernation capability with RTC, 50 MHz CPU clock, 256 KB on-chip flash, and QFP-100 package compatibility for space-constrained industrial PCBs.
Technical Context
The LM3S8971-EQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU, enabling deterministic interrupt handling and memory protection in safety-critical firmware. Its integrated CAN controller supports bit rates up to 1 Mbps and full CAN 2.0B message filtering with 32 message objects.
Hibernation mode draws ≤2 µA while retaining RTC time, battery-backed RAM, and wake-up capability via GPIO or CAN activity. The ADC supports hardware averaging across up to 64 samples per conversion, with programmable trigger sources including timer match and CAN message arrival.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface and 128-byte erase sectors |
| SRAM | 64 KB on-chip SRAM, zero-wait-state access at 50 MHz |
| CAN Interface | One CAN 2.0A/B controller with 32 message objects, programmable bit timing, and loopback test mode |
| ADC | 12-bit SAR ADC with 8 single-ended/4 differential inputs, 1 MSPS max sample rate, hardware averaging |
| Hibernation Module | Supports RTC, battery-backed 2 KB RAM, wake-on-CAN, wake-on-GPIO, and deep-sleep current ≤2 µA |
| Package | 100-pin LQFP (EQC), 14 mm × 14 mm, 0.5 mm pitch, RoHS-compliant |
Pinout & Package
LM3S8971-EQC50-A2 is housed in a 100-pin LQFP (EQC) package with exposed thermal pad. Pin functions are defined per TI SPMS176I datasheet Rev I (July 2014), supporting multiplexed peripherals including CAN, UARTx3, SSIx2, I²Cx1, PWMx6, and GPIOx43.
| 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 CPU domains |
| VSS, VSSA, VSSC | Ground returns | Dedicated analog ground (VSSA) and core ground (VSSC) reduce coupling between signal paths |
| CAN0RX / CAN0TX | CAN physical layer interface | Differential CAN bus receive/transmit pins compatible with ISO 11898-2 transceivers |
| SSI0CLK / SSI0FSS / SSI0RX / SSI0TX | Synchronous serial interface | Four-pin SPI-compatible interface supporting master/slave modes and frame formats (Motorola/Freescale, TI, Microwire) |
| UART0RX / UART0TX | Asynchronous serial interface | Full-duplex UART with programmable baud rate, FIFO, and IrDA/SIR support |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CAN 2.0B Controller | Enables robust fieldbus communication without external CAN controller IC or protocol stack overhead |
| Hibernation Mode with RTC | Allows battery-powered operation for months using coin-cell backup while maintaining accurate timekeeping |
| Hardware-Averaged ADC | Reduces firmware load and improves SNR by performing up to 64-sample averaging in hardware before CPU read |
| ARM Cortex-M3 with MPU | Provides memory protection, nested vectored interrupts, and Thumb-2 code density for deterministic real-time response |
| Multiple Low-Power Modes | Supports sleep, deep-sleep, and hibernate states with configurable wake sources (GPIO, CAN, timer, RTC alarm) |
Applications
| Industrial Motor Control | Building Automation System |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC fans and pumps using PWM outputs and ADC feedback from current sensors. IC Role / Device Role / Timing Role: Real-time execution host with integrated CAN for distributed actuator coordination and ADC sampling synchronized to PWM edges. Use Value: Eliminates need for external CAN controller and reduces BOM count while enabling precise 50 MHz timing for 20 kHz PWM generation. | Use Scenario: Central controller in lighting and HVAC subsystems communicating over CAN bus with remote sensor nodes and actuators. IC Role / Device Role / Timing Role: CAN network master managing scheduling, fault reporting, and time-stamped event logging via integrated RTC. Use Value: Hibernation mode maintains system time and state during power loss, enabling seamless recovery without external RTC chip or backup circuitry. |
| Energy Metering Gateway | Factory Floor I/O Module |
Use Scenario: Aggregating pulse-count data from multiple utility meters and transmitting via CAN to a central SCADA node. IC Role / Device Role / Timing Role: Data concentrator with timestamped capture of meter pulses using GPIO interrupts and internal RTC. Use Value: Hardware RTC and battery-backed RAM retain cumulative kWh counts and timestamps across AC power outages. | Use Scenario: DIN-rail mounted digital I/O module converting 24 V DC field signals to CAN messages for PLC integration. IC Role / Device Role / Timing Role: Isolated input conditioning and CAN protocol handler with configurable debounce and edge-triggered interrupts. Use Value: Integrated CAN controller and hibernation support enable reliable operation in unattended environments with minimal external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Tiva C TM4C123GH6PM | Successor device with same ARM Cortex-M4F core, 256 KB flash, but adds FPU, USB, and enhanced PWM; no hibernation module | Lacks battery-backed RTC and hibernation current <2 µA - unsuitable for long-term battery operation | Select when floating-point math or USB host/device is required; avoid if ultra-low-power hibernation is mandatory |
| STM32F103VET6 | ARM Cortex-M3 with 512 KB flash, 64 KB SRAM, CAN 2.0B, but no dedicated hibernation module or battery-backed RAM | Requires external RTC and backup capacitor/supercap for timekeeping during power loss | Choose for higher flash density and broader ecosystem; accept added BOM complexity for RTC functionality |
Compared with TM4C123GH6PM and STM32F103VET6, the LM3S8971-EQC50-A2 uniquely integrates hibernation with battery-backed RAM and sub-2 µA deep-sleep current - critical for battery-powered CAN nodes where runtime and timekeeping integrity cannot rely on external components.
Availability
LM3S8971-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, building automation, energy metering gateways, and factory floor I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for LM3S8971-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 connectivity technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as the first ARM Cortex-M3-based microcontroller family for cost-sensitive industrial applications demanding real-time performance, integrated communication (CAN, UART, SSI), and ultra-low-power hibernation - directly addressing needs in motor drives and distributed control systems.
FAQ
What is the maximum operating frequency of the LM3S8971-EQC50-A2?
The LM3S8971-EQC50-A2 operates at a maximum CPU clock frequency of 50 MHz, derived from an internal PLL that accepts input from an external crystal (4–25 MHz) or internal oscillator. This frequency enables deterministic real-time execution of motor control loops and CAN message handling without external clock synthesis circuitry. The LM3S8971-EQC50-A2 maintains full peripheral functionality-including ADC sampling, PWM generation, and CAN bit timing-at this rated speed.
Does the LM3S8971-EQC50-A2 support CAN FD?
No, the LM3S8971-EQC50-A2 supports only classical CAN 2.0A/B protocols with fixed 11-bit or 29-bit identifiers and up to 8 bytes per frame. It does not implement CAN FD features such as flexible data-rate switching, extended payload length, or CRC enhancements. The LM3S8971-EQC50-A2 CAN controller complies with ISO 11898-1 and supports bit rates up to 1 Mbps under standard timing constraints.
What power modes are available on the LM3S8971-EQC50-A2?
The LM3S8971-EQC50-A2 offers Sleep, Deep-Sleep, and Hibernate modes. Hibernate draws ≤2 µA with RTC active and 2 KB battery-backed RAM retained. Wake-up sources include GPIO edges, CAN activity, RTC alarm, and external interrupts. The LM3S8971-EQC50-A2 exits Hibernate in under 10 µs, preserving register context and enabling rapid resumption of control tasks after power interruption.
Is the LM3S8971-EQC50-A2 pin-compatible with other Stellaris LM3S devices?
The LM3S8971-EQC50-A2 uses a 100-pin LQFP (EQC) package shared with several LM3S variants (e.g., LM3S811, LM3S818), but pin functions differ significantly due to peripheral configuration. For example, CAN0RX/TX appear on different pins across models, and ADC channel mapping varies. The LM3S8971-EQC50-A2 is not a drop-in replacement for other EQC-packaged LM3S parts without PCB layout revision and firmware adaptation.
What development tools support the LM3S8971-EQC50-A2?
The LM3S8971-EQC50-A2 is supported by Texas Instruments' Code Composer Studio v5.x and earlier, Keil MDK-ARM v4.7x, and IAR Embedded Workbench for ARM v6.5x. TI's StellarisWare Peripheral Driver Library provides hardware abstraction for all on-chip peripherals. Debugging uses JTAG via standard 20-pin ARM connector; the LM3S8971-EQC50-A2 does not support SWD. Evaluation boards such as EK-LM3S8962 and DK-LM3S9B92 provide reference schematics and firmware examples.
LM3S8971-EQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 8000
- Packaging:
- Tray
- 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-A2 FAQ
1.How can I place an order for LM3S8971-EQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S8971-EQC50-A2 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-A2 reliable?
The price and inventory of LM3S8971-EQC50-A2 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-A2 is usually 5 days.
3.What payment methods are accepted for LM3S8971-EQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S8971-EQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S8971-EQC50-A2?
LM3S8971-EQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S8971-EQC50-A2 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-A2?
For technical support, including LM3S8971-EQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S8971-EQC50-A2 requirements.
6.How does Aetrix verify that LM3S8971-EQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S8971-EQC50-A2 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-A2 meets industry standards.
7.What is the process for return or replacement of LM3S8971-EQC50-A2?
All LM3S8971-EQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S8971-EQC50-A2, 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-A2 part is unused and in its original packaging.
Return procedure for LM3S8971-EQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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