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Texas Instruments LM3S6918-EQC50-A2
- Part No.:
- LM3S6918-EQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6918-EQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
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Product details
Overview
LM3S6918-EQC50-A2 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-A2 datasheet, LM3S6918-EQC50-A2 pinout, LM3S6918-EQC50-A2 application, or LM3S6918-EQC50-A2 equivalent, key selection criteria include Ethernet MAC integration, hibernation power management, 50 MHz Cortex-M3 performance, and QFP-100 package compatibility for space-constrained industrial controllers.
Technical Context
The LM3S6918-EQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, MPU, and debug support via JTAG/SWD. It integrates a full Ethernet MAC (MII interface) without external PHY, enabling standalone wired connectivity in resource-limited edge nodes.
Its analog subsystem includes an 8-channel, 10-bit ADC with hardware averaging and internal temperature sensor; digital peripherals include two UARTs (one with IrDA/SIR), two SSI modules, and an I²C controller supporting standard/fast-mode speeds up to 400 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic real-time execution for motor control loops and protocol stacks. |
| Memory | 256 KB on-chip flash + 64 KB SRAM - sufficient for standalone Ethernet-enabled firmware with TCP/IP stack and application logic. |
| ADC | 10-bit, 8-channel SAR ADC with 1 MSPS sample rate and hardware averaging - supports precision analog monitoring in industrial sensors and power supplies. |
| Ethernet Interface | Integrated MAC with MII interface - eliminates need for external MAC/PHY IC, reducing BOM count and PCB area in networked controllers. |
| Hibernation Module | Dedicated hibernate domain with RTC, battery-backed RAM (2 KB), and wake-on-RTC/external-pin - enables sub-µA sleep current for battery-backed remote nodes. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount assembly and provides full peripheral pin access including MII signals. |
| Clock Sources | Internal 6–8 MHz oscillator, PLL support up to 50 MHz, and external crystal input - allows flexible clock tree design without requiring high-frequency external crystals. |
Pinout & Package
LM3S6918-EQC50-A2 is housed in a 100-pin LQFP (EQC) package with exposed thermal pad. Pin numbering follows standard counter-clockwise sequence from pin 1 (top-left corner, marked dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate domains for digital core (VDDC), analog (VDDA), and I/O (VDD) - enable noise isolation and independent power sequencing. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog (GNDA) and core (GNDC) grounds reduce coupling between sensitive ADC and switching logic. |
| PA0–PA7, PB0–PB7, etc. | GPIO banks A–G | Multi-function pins supporting UART, SSI, I²C, PWM, and ADC inputs - allow flexible peripheral mapping without external muxing. |
| RMII/MII pins (TXD0–1, RXD0–1, CRS, COL, etc.) | Ethernet physical layer interface | Full MII signal set (16 pins) supports direct connection to external PHY; RMII mode reduces pin count to 7 for cost-sensitive designs. |
| OSC0/OSC1 | Clock crystal terminals | Supports 1–25 MHz crystal or external clock source - used to drive PLL for stable 50 MHz system clock. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | Reduces component count by eliminating discrete MAC IC; supports MII/ RMII for PHY flexibility and board layout optimization. |
| Hibernation module with RTC | Enables ultra-low-power operation (< 1.5 µA typical) with time-stamped wake-up and 2 KB battery-backed SRAM retention. |
| Dual UART with IrDA/SIR | Supports legacy serial diagnostics and infrared communication without external transceivers - simplifies front-panel or remote interface design. |
| Programmable GPIO with commit control | Prevents spurious output during configuration; ensures glitch-free state transitions when reassigning pin functions at runtime. |
| Hardware ADC averaging | Configurable 2x–64x oversampling and averaging - improves effective resolution to ~12 bits without software overhead or CPU load. |
Applications
| Industrial Motor Control | Networked Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC actuators with local feedback and remote monitoring over Ethernet. IC Role / Device Role / Timing Role: Real-time motor commutation timing generator, ADC-based current/voltage sensing hub, and Ethernet packet handler. Use Value: Integrated 50 MHz Cortex-M3 executes FOC algorithms within 10 µs; hibernation mode extends battery life during idle periods between commands. | Use Scenario: Environmental monitoring node with temperature/humidity/pressure sensors, logging data locally and transmitting via Ethernet to gateway. IC Role / Device Role / Timing Role: Sensor interface aggregator, low-power scheduler, and Ethernet MAC controller for IEEE 802.3-compliant frame transmission. Use Value: On-chip 8-channel ADC acquires all sensor signals simultaneously; hibernation RTC triggers periodic wake-up every 30 seconds for measurement and transmit cycles. |
| Programmable Logic Controller (PLC) I/O Module | Building Automation Gateway |
Use Scenario: DIN-rail mounted I/O expansion module with digital inputs, relay outputs, and Ethernet backhaul to central SCADA system. IC Role / Device Role / Timing Role: Deterministic I/O state manager, watchdog-coordinated safety monitor, and Ethernet link controller. Use Value: GPIO commit control prevents output glitches during firmware updates; integrated MAC ensures deterministic latency under 100 µs for cyclic I/O scanning. | Use Scenario: Protocol translation gateway connecting BACnet MS/TP field devices to IP-based building management system. IC Role / Device Role / Timing Role: Dual-protocol bridge (UART for MS/TP, Ethernet for IP), time-synchronized event logger, and secure boot loader host. Use Value: Two UARTs handle separate MS/TP master/slave roles; 256 KB flash stores dual firmware images for safe over-the-air updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQC50-A2 | Same Cortex-M3 core, 256 KB flash, but adds CAN controller and removes Ethernet MAC; 100-pin LQFP. | Better suited for automotive body control or industrial fieldbus networks where CAN is required and Ethernet is not. | Select when CAN bus integration is mandatory and Ethernet is unnecessary - avoids unused MAC logic and associated pin routing. |
| TM4C123GH6PM | Successor generation: Cortex-M4F core, 256 KB flash, 32 KB SRAM, integrated Ethernet PHY option, enhanced ADC (12-bit, 1 MSPS). | Supports floating-point math for advanced filtering and higher-resolution analog acquisition in next-gen designs. | Choose for new designs requiring DSP capability, higher ADC resolution, or integrated PHY - note different pinout and voltage requirements. |
Compared with LM3S6918-EQC50-A2, LM3S8962-IQC50-A2 trades Ethernet for CAN in identical packaging, while TM4C123GH6PM upgrades core, ADC, and PHY integration but requires PCB redesign due to non-pin-compatible footprint and revised power sequencing.
Availability
LM3S6918-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, networked sensor nodes, PLC I/O modules, and building automation gateways requiring stable component supply and long-term obsolescence planning.
Supply support for LM3S6918-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 specializing in analog, embedded processing, and connectivity technologies with decades of industrial and automotive qualification expertise.
The Stellaris LM3S family was designed for cost-sensitive, real-time embedded applications requiring integrated connectivity (Ethernet, USB, CAN), analog sensing, and low-power operation - targeting industrial automation, building controls, and intelligent sensors.
FAQ
What is the maximum operating frequency of the LM3S6918-EQC50-A2?
The LM3S6918-EQC50-A2 operates at a maximum system clock frequency of 50 MHz, achieved using its on-chip PLL driven by an internal oscillator or external crystal. This frequency is specified across the full industrial temperature range (–40°C to +85°C) and supports deterministic real-time execution for motor control and protocol handling. The LM3S6918-EQC50-A2 maintains timing compliance without derating under worst-case voltage and temperature conditions.
Does the LM3S6918-EQC50-A2 include an integrated Ethernet PHY?
No, the LM3S6918-EQC50-A2 integrates only the Ethernet MAC layer and requires an external PHY for physical layer signaling. It provides a full MII interface (16 pins) or reduced RMII interface (7 pins) to connect to industry-standard PHY ICs such as the DP83848 or LAN8720. The LM3S6918-EQC50-A2 does not contain magnetics or PHY circuitry on-die.
What power modes does the LM3S6918-EQC50-A2 support?
The LM3S6918-EQC50-A2 supports Sleep, Deep-Sleep, and Hibernation modes. Hibernation achieves <1.5 µA typical current draw with RTC running and 2 KB SRAM retained using a backup battery. Wake-up sources include RTC match, external GPIO, and Brown-Out Reset. The LM3S6918-EQC50-A2 uses dedicated hibernate domain circuitry to isolate power domains during ultra-low-power operation.
Is the LM3S6918-EQC50-A2 pin-compatible with other Stellaris LM3S devices?
The LM3S6918-EQC50-A2 is not fully pin-compatible with other LM3S devices in the same package size. While it shares the 100-pin LQFP (EQC) footprint with parts like LM3S8962-IQC50-A2, signal assignments differ - especially for Ethernet MII pins versus CAN or USB signals. Board-level reuse requires verification of pin function mapping and power domain routing. The LM3S6918-EQC50-A2 must be treated as a unique pinout variant.
What development tools support the LM3S6918-EQC50-A2?
The LM3S6918-EQC50-A2 is supported by TI's Code Composer Studio v5.x and earlier, Keil MDK-ARM v4.x, and IAR Embedded Workbench for ARM. StellarisWare Peripheral Driver Library provides hardware abstraction for all on-chip peripherals. Evaluation is enabled via the EK-LM3S8962 and EK-LM3S9B92 kits, which share compatible debug interfaces and power architecture. The LM3S6918-EQC50-A2 requires JTAG or SWD debugging with appropriate voltage level translation for target board interfacing.
LM3S6918-EQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 6000
- Packaging:
- Tray
- 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-A2 FAQ
1.How can I place an order for LM3S6918-EQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6918-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 LM3S6918-EQC50-A2 reliable?
The price and inventory of LM3S6918-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 LM3S6918-EQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S6918-EQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6918-EQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6918-EQC50-A2?
LM3S6918-EQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6918-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 LM3S6918-EQC50-A2?
For technical support, including LM3S6918-EQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6918-EQC50-A2 requirements.
6.How does Aetrix verify that LM3S6918-EQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S6918-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 LM3S6918-EQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S6918-EQC50-A2?
All LM3S6918-EQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6918-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 LM3S6918-EQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S6918-EQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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