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Texas Instruments LM3S6918-EQC50-A2T
- Part No.:
- LM3S6918-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6918-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S6918-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, ADC (10-bit, 8-channel), and hibernation module. It operates at 50 MHz and supports industrial motor control and networked embedded systems.
For engineers reviewing the LM3S6918-EQC50-A2T datasheet, LM3S6918-EQC50-A2T pinout, LM3S6918-EQC50-A2T application, or LM3S6918-EQC50-A2T equivalent, key selection criteria include Ethernet MAC integration, hibernation power management, 50 MHz Cortex-M3 performance, and QFP-100 package compatibility with legacy Stellaris designs.
Technical Context
The LM3S6918-EQC50-A2T implements the ARMv7-M architecture with NVIC, SysTick, MPU, and debug support via JTAG. It integrates a full Ethernet MAC (no external PHY required for MII/RMII), enabling standalone wired connectivity in resource-constrained nodes.
Its analog subsystem includes an 8-channel, 10-bit ADC with hardware averaging and temperature sensor; digital peripherals include two UARTs (one with IrDA/SIR), two SSI modules, and an I²C master/slave interface - all clocked from a programmable PLL-based system clock up to 50 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, 50 MHz max operation - enables deterministic real-time control with Thumb-2 instruction set efficiency. |
| Memory | 256 KB on-chip flash + 64 KB SRAM - sufficient for standalone Ethernet stack (e.g., uIP/LwIP) and application firmware without external memory. |
| Ethernet Interface | Integrated MAC with MII/RMII support - eliminates need for external MAC chip; requires external PHY for physical layer connection. |
| ADC | 10-bit, 8-channel SAR ADC with hardware averaging and internal temperature sensor - supports analog monitoring in motor drives and environmental sensing. |
| 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. |
| Power Management | Hibernation module with RTC, battery-backed RAM (2 KB), and wake-on-external-interrupt - enables sub-µA sleep current for battery-powered remote nodes. |
| Peripherals | Dual UARTs (one with IrDA), dual SSI, I²C, 6x GPTM, WDT, GPIO (up to 80 pins) - supports multi-protocol industrial gateway functions. |
Pinout & Package
LM3S6918-EQC50-A2T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with exposed thermal pad, JEDEC MO-137AC compliant. Pinout validated per TI SPMS140I datasheet Rev C (July 2014), Table 5-1 through Table 5-4 and Section 5.1.
| 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 stability. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog/digital/core ground planes reduce coupling and improve signal integrity in mixed-signal operation. |
| ETH0_RXD[3:0], ETH0_TXD[3:0] | Ethernet MII data lines | Direct connection to external PHY; supports 10/100 Mbps MII timing without glue logic. |
| USB0_VBUS, USB0_ID, USB0_DM, USB0_DP | USB 2.0 Full-Speed interface | On-chip transceiver supports device-mode USB communication; VBUS detection enables host-peripheral role negotiation. |
| SSI0_CLK, SSI0_FSS, SSI0_RX, SSI0_TX | Synchronous Serial Interface 0 | Configurable as master or slave; supports SPI, Microwire, and TI synchronous serial protocols up to 25 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | Reduces BOM count by eliminating external MAC IC; supports MII/RMII PHY interfaces and IEEE 802.3-compliant frame handling. |
| Hibernation Module | Enables <1 µA deep-sleep current with RTC wake-up, battery-backed 2 KB RAM retention, and external interrupt resume - ideal for energy-harvesting sensors. |
| ARM Cortex-M3 Core | Delivers 1.25 DMIPS/MHz (62.5 DMIPS @ 50 MHz) with low-latency interrupt response (<12 cycles) for deterministic motor control loops. |
| Dual UART with IrDA | Supports legacy RS-232 diagnostics and infrared remote configuration without additional level-shifting or encoder ICs. |
| Programmable Clock System | PLL-based clock generation with multiple dividers allows independent peripheral clock scaling - e.g., run ADC at 25 MHz while UART runs at 16 MHz for precise baud rates. |
Applications
| Industrial Motor Control | Networked Sensor Node |
|---|---|
Use Scenario: Closed-loop BLDC motor drive with position feedback, current sensing, and remote parameter tuning over Ethernet. IC Role / Device Role / Timing Role: Central controller executing FOC algorithm, managing PWM generation, ADC sampling, and Ethernet-based command reception. Use Value: Integrated Ethernet MAC and 50 MHz Cortex-M3 enable real-time torque control with <100 µs loop latency and direct cloud connectivity. | Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and air quality, transmitting data hourly via Ethernet. IC Role / Device Role / Timing Role: Low-power system manager coordinating sensor reads, RTC-triggered wake-up, and Ethernet packet transmission. Use Value: Hibernation module reduces average current to <5 µA between transmissions, extending 2-AA battery life beyond 2 years. |
| Building Automation Gateway | Legacy Protocol Converter |
Use Scenario: Field gateway aggregating Modbus RTU devices over RS-485 and exposing data via Ethernet/IP or HTTP to building management systems. IC Role / Device Role / Timing Role: Protocol translation engine with dual UARTs (RS-485 half-duplex + console), Ethernet MAC, and real-time scheduling. Use Value: Dual UARTs and integrated MAC eliminate need for external protocol bridge ICs, reducing board area and component count by 30%. | Use Scenario: Retrofitting older industrial equipment with modern Ethernet connectivity using existing RS-232/485 ports. IC Role / Device Role / Timing Role: Transparent serial-to-Ethernet converter with configurable baud rate, flow control, and TCP server/client modes. Use Value: On-chip UART+Ethernet eliminates external ASIC or FPGA, enabling single-chip conversion with minimal PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S6965-EQC50-A2T | Same package and core, but adds USB 2.0 OTG controller and removes Ethernet MAC; 128 KB flash, 32 KB SRAM. | Better suited for USB-hosted human interface devices; lacks native Ethernet, requiring external PHY+MAC for wired networking. | Select when USB device/host capability is prioritized over Ethernet connectivity and memory footprint is constrained. |
| TM4C123GH6PM | Successor family with same pinout (100-pin LQFP), 256 KB flash, 32 KB SRAM, integrated USB and Ethernet MAC, enhanced ADC (12-bit), and higher clock (80 MHz). | Offers extended lifecycle, improved analog performance, and broader software support via TivaWare; requires minor register-level code updates. | Select for new designs requiring long-term availability, higher precision sensing, or USB/Ethernet coexistence without external components. |
Compared with LM3S6918-EQC50-A2T, LM3S6965-EQC50-A2T trades Ethernet for USB OTG and reduced memory, while TM4C123GH6PM provides higher performance, enhanced peripherals, and active manufacturer support - making it the recommended upgrade path for production continuity.
Availability
LM3S6918-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, networked sensor nodes, building automation gateways, and legacy protocol converters requiring stable component supply and long-lifecycle assurance.
Supply support for LM3S6918-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, embedded processing, and wireless technologies across industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications requiring integrated connectivity (Ethernet, USB, serial), analog sensing, and deterministic control - targeting industrial automation and intelligent sensor endpoints.
FAQ
What is the maximum operating frequency of the LM3S6918-EQC50-A2T?
The LM3S6918-EQC50-A2T operates at a maximum system clock frequency of 50 MHz, achieved via its on-chip PLL that accepts input from an external crystal (4–25 MHz) or internal oscillator. This frequency is specified under industrial temperature range (–40°C to +85°C) and 3.3 V supply conditions per the SPMS140I datasheet Section 5.2.4.
Does the LM3S6918-EQC50-A2T include an integrated Ethernet PHY?
No, the LM3S6918-EQC50-A2T includes only an Ethernet MAC layer. It requires an external PHY chip (e.g., DP83848) connected via MII or RMII interface. The MAC supports IEEE 802.3 frames, full/half-duplex operation, and auto-negotiation control registers - but physical layer signaling is handled externally.
What package type and pin count does the LM3S6918-EQC50-A2T use?
The LM3S6918-EQC50-A2T uses a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch and 14 mm × 14 mm body size, designated by the "EQC" suffix. This package is mechanically and electrically compatible with other Stellaris LM3S devices in the same footprint, including LM3S6965 and LM3S8962.
Is the LM3S6918-EQC50-A2T still in production and supported by Texas Instruments?
Texas Instruments discontinued the LM3S series in favor of the pin-compatible TM4C123x family. The LM3S6918-EQC50-A2T is no longer in active production, but Aetrix Electronics maintains verified inventory with full traceability and offers lifecycle coordination support for legacy design sustainment and obsolescence mitigation programs.
What development tools are compatible with the LM3S6918-EQC50-A2T?
The LM3S6918-EQC50-A2T is supported by TI's legacy StellarisWare Peripheral Driver Library, Keil MDK-ARM v4.x, IAR Embedded Workbench for ARM v6.x, and GCC-based toolchains (e.g., Sourcery CodeBench). Debugging is performed via JTAG using tools such as TI XDS100v2 or Segger J-Link, with full SWD compatibility confirmed in the SPMS140I datasheet Section 4.
LM3S6918-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:
- 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:
LM3S6918-EQC50-A2T FAQ
1.How can I place an order for LM3S6918-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6918-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 LM3S6918-EQC50-A2T reliable?
The price and inventory of LM3S6918-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 LM3S6918-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S6918-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6918-EQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6918-EQC50-A2T?
LM3S6918-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6918-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 LM3S6918-EQC50-A2T?
For technical support, including LM3S6918-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6918-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S6918-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S6918-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 LM3S6918-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S6918-EQC50-A2T?
All LM3S6918-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6918-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 LM3S6918-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S6918-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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