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Texas Instruments LM3S6911-EQC50-A2T
- Part No.:
- LM3S6911-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6911-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
LM3S6911-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated Ethernet MAC, dual UARTs, I²C, SSI, analog comparators, and hibernation module. It operates at 50 MHz, supports -40°C to +105°C industrial temperature range, and targets embedded control in networked industrial equipment.
For engineers reviewing the LM3S6911-EQC50-A2T datasheet, LM3S6911-EQC50-A2T pinout, LM3S6911-EQC50-A2T application, or LM3S6911-EQC50-A2T equivalent, key selection criteria include Ethernet MAC integration, hibernation power management, 100-pin LQFP package, 50 MHz operation, and industrial temperature rating.
Technical Context
The LM3S6911-EQC50-A2T implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic real-time interrupt handling and memory protection. Its system-level peripherals include a hibernation module with RTC and battery-backed memory, plus an integrated 10/100 Ethernet MAC without external PHY interface.
Peripherals are clock-gated and configurable via the system control block, supporting low-power modes including deep-sleep and hibernate. The device uses a single 3.3-V supply and includes internal voltage regulation, eliminating need for external LDOs in many designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Harvard architecture with Thumb-2 instruction set |
| Max Clock Speed | 50 MHz - enables real-time control loop execution within 20 ns timing resolution |
| Flash Memory | 256 KB - sufficient for bootloader, protocol stacks (e.g., TCP/IP), and application firmware |
| SRAM | 64 KB - supports Ethernet frame buffering, stack allocation, and real-time data buffers |
| Operating Temp | -40°C to +105°C - qualified for industrial automation, motor drives, and outdoor gateways |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) - compatible with standard PCB assembly and thermal relief design |
| Ethernet Interface | Integrated 10/100 MAC - requires external PHY but eliminates external MAC IC and associated glue logic |
| Hibernate Mode | Sub-µA current draw with RTC and 2 KB battery-backed RAM retention - enables long-term battery operation |
Pinout & Package
LM3S6911-EQC50-A2T is housed in a 100-pin LQFP package (JEDEC MS-026AC) with exposed thermal pad. Pinout supports multiplexed GPIO, dedicated Ethernet MII signals, UART/SSI/I²C interfaces, analog comparator inputs, and hibernation control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital, analog, and core domains enable noise isolation and precise ADC reference stability |
| PD0–PD7, PE0–PE7, PF0–PF4, etc. | GPIO bank terminals | Configurable as digital I/O, peripheral functions (UART0/1, SSI0/1, I²C0), or analog inputs |
| RMII_RXD0, RMII_RXD1, RMII_CRS_DV, RMII_TXEN, RMII_TXD0, RMII_TXD1, RMII_REFCLK | Ethernet RMII interface | Supports reduced-pin-count 10/100 Ethernet PHY connection; no MII bus required |
| HIB_RTCCLK, HIB_WAKE, HIB_NRES, HIB_VDD3P3 | Hibernation module control | Enable wake-on-RTC alarm, external event, or battery voltage monitoring without CPU wake-up |
| U0RX, U0TX, U1RX, U1TX | UART transceiver I/O | Dual full-duplex UARTs support simultaneous debug console and fieldbus communication (e.g., Modbus RTU) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | Reduces BOM count by eliminating discrete MAC IC; supports IEEE 802.3-compliant frame handling and checksum offload |
| Hibernation Module with RTC | Enables <1 µA sleep current with timekeeping and wake-on-alarm-critical for battery-powered remote sensors |
| Dual UART + I²C + Dual SSI | Allows concurrent serial communication with multiple field devices (e.g., RS-485 gateway with SPI sensor hub and I²C EEPROM) |
| ARM Cortex-M3 + NVIC | Provides deterministic sub-1 µs interrupt latency and priority-based nested interrupt handling for motion control loops |
| 256 KB Flash + 64 KB SRAM | Supports dual-bank firmware updates and runtime packet buffering for Ethernet TCP/IP stack operation |
Applications
| Industrial Ethernet Gateway | Smart Sensor Node |
|---|---|
Use Scenario: Protocol translation between Modbus RTU field devices and Ethernet-based SCADA systems. IC Role / Device Role / Timing Role: Central controller executing TCP/IP stack, Modbus parsing, and real-time scheduling. Use Value: Integrated Ethernet MAC reduces latency vs. external MAC+PHY solutions; hibernation mode extends battery life during idle periods. | Use Scenario: Wireless-capable environmental sensor collecting temperature, humidity, and air quality data. IC Role / Device Role / Timing Role: Primary MCU managing sensor readout, data preprocessing, and low-power wireless transmission scheduling. Use Value: Sub-µA hibernate current with RTC wake-up enables multi-year battery life; dual UARTs support debug and sensor interface simultaneously. |
| Programmable Logic Controller (PLC) I/O Module | Motor Control Interface Unit |
Use Scenario: DIN-rail mounted I/O expansion module with digital input/output and analog monitoring. IC Role / Device Role / Timing Role: Real-time I/O processor with deterministic response to field events and Ethernet-based configuration. Use Value: Cortex-M3 NVIC ensures <1 µs interrupt response to fast edge-triggered inputs; 64 KB SRAM buffers diagnostic logs and configuration snapshots. | Use Scenario: Closed-loop motor drive interface handling encoder feedback, PWM generation, and safety monitoring. IC Role / Device Role / Timing Role: Motion controller coordinating timer-based PWM, quadrature decoding, and fault-safe shutdown sequencing. Use Value: 50 MHz clock and hardware timers support 100 kHz PWM carrier frequency; analog comparators enable overcurrent trip detection with <100 ns response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S6965-IQC50-A2 | Same core, 256 KB flash, 64 KB SRAM, but adds USB 2.0 OTG controller and removes Ethernet MAC | Better suited for USB-connected human interface devices; lacks native Ethernet for industrial networking | Select when USB host/device capability is required and Ethernet is not needed |
| TM4C123GH6PM | Successor family with same pinout, 256 KB flash, 32 KB SRAM, enhanced Ethernet PHY interface, and FPU option | Higher performance per MHz, improved peripheral flexibility, but reduced SRAM may constrain TCP/IP buffer depth | Prefer for new designs requiring extended lifecycle support and higher computational throughput |
Compared with LM3S6911-EQC50-A2T, LM3S6965-IQC50-A2 trades Ethernet for USB, limiting networked control use; TM4C123GH6PM offers modernized peripherals and longer TI support but requires SRAM-aware stack optimization due to halved SRAM size.
Availability
LM3S6911-EQC50-A2T is available at Aetrix Electronics and suitable for industrial Ethernet gateways, smart sensor nodes, PLC I/O modules, and motor control interface units requiring stable component supply across extended production lifecycles.
Supply support for LM3S6911-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 connectivity technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as TI's first ARM Cortex-M3-based microcontroller family targeting cost-sensitive, real-time industrial control applications with integrated communication peripherals and robust power management.
FAQ
What is the maximum operating frequency of the LM3S6911-EQC50-A2T?
The LM3S6911-EQC50-A2T operates at a maximum frequency of 50 MHz. This speed is achieved using the internal PLL driven from the main oscillator or external crystal. The 50 MHz clock feeds the Cortex-M3 core, system bus, and all synchronous peripherals, enabling real-time deterministic execution for industrial control tasks. All timing specifications in the LM3S6911-EQC50-A2T datasheet assume this rated frequency under specified voltage and temperature conditions.
Does the LM3S6911-EQC50-A2T include an integrated Ethernet PHY?
No, the LM3S6911-EQC50-A2T integrates only the Ethernet MAC layer-not a physical layer (PHY). It supports both MII and RMII interfaces, requiring an external PHY such as the DP83848 or LAN8720 for 10/100BASE-TX connectivity. The RMII interface reduces pin count and simplifies layout, while the MAC handles frame assembly, CRC calculation, and DMA transfers independently of CPU intervention.
What power-saving modes does the LM3S6911-EQC50-A2T support?
The LM3S6911-EQC50-A2T supports Sleep, Deep-Sleep, and Hibernate modes. Hibernate draws less than 1 µA and retains RTC operation and 2 KB of SRAM using a backup battery. Sleep and Deep-Sleep disable CPU and selected peripherals while preserving full SRAM and register state. These modes are controlled via the hibernation module and system control registers, and are validated across the full -40°C to +105°C temperature range specified for the LM3S6911-EQC50-A2T.
How much on-chip memory does the LM3S6911-EQC50-A2T provide?
The LM3S6911-EQC50-A2T provides 256 KB of on-chip flash memory and 64 KB of on-chip SRAM. The flash is organized into 1 KB sectors and supports in-application programming (IAP); the SRAM is unified and accessible at full speed by both CPU and DMA. Both memory blocks are mapped into the Cortex-M3's linear address space and meet timing requirements at 50 MHz operation, as confirmed in the LM3S6911-EQC50-A2T datasheet revision SPMS139I.
Is the LM3S6911-EQC50-A2T pin-compatible with other Stellaris LM3S devices?
The LM3S6911-EQC50-A2T is pin-compatible with other 100-pin LQFP Stellaris devices in the LM3S6000 family-including LM3S6965 and LM3S6100-but not with smaller-package variants. Pin compatibility covers power, ground, GPIO, UART, SSI, I²C, and hibernation signals; however, Ethernet MII/RMII and USB signals differ across models. Always verify signal mapping against the specific device's pin diagram before board reuse, as documented for the LM3S6911-EQC50-A2T in section 16 of its datasheet.
LM3S6911-EQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 6000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Ethernet, I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 46
- 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:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S6911-EQC50-A2T FAQ
1.How can I place an order for LM3S6911-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6911-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 LM3S6911-EQC50-A2T reliable?
The price and inventory of LM3S6911-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 LM3S6911-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S6911-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6911-EQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6911-EQC50-A2T?
LM3S6911-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6911-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 LM3S6911-EQC50-A2T?
For technical support, including LM3S6911-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6911-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S6911-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S6911-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 LM3S6911-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S6911-EQC50-A2T?
All LM3S6911-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6911-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 LM3S6911-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S6911-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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