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Texas Instruments LM3S6918-IQC50-A2
- Part No.:
- LM3S6918-IQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6918-IQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,521
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Product details
Overview
LM3S6918-IQC50-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 temperature range (–40°C to +85°C) in a 100-pin LQFP package. Used in networked industrial controllers requiring real-time Ethernet connectivity and low-power hibernation.
For engineers reviewing the LM3S6918-IQC50-A2 datasheet, LM3S6918-IQC50-A2 pinout, LM3S6918-IQC50-A2 application, or LM3S6918-IQC50-A2 equivalent, key selection criteria include Ethernet MAC integration, hibernation mode current (1.7 µA), 50 MHz CPU clock, 100-pin LQFP mechanical compatibility, and StellarisWare® software support.
Technical Context
The LM3S6918-IQC50-A2 implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic interrupt response and memory protection. It integrates a full IEEE 802.3-compliant Ethernet MAC with MII interface, supporting 10/100 Mbps operation without external PHY control logic.
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 master/slave controller-all clocked from a programmable PLL-based system clock tree.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 50 MHz max operation |
| Memory | 256 KB on-chip flash (programmable in 1 KB sectors), 64 KB SRAM |
| ADC | 10-bit SAR ADC with 8 input channels, 1 MSPS sample rate, hardware averaging up to 64x |
| Ethernet | Integrated IEEE 802.3 MAC with MII interface, no external PHY required for basic MAC-layer operation |
| Hibernation Current | 1.7 µA typical in hibernate mode with RTC active and battery-backed RAM retained |
| Operating Temp | –40°C to +85°C industrial grade, qualified per AEC-Q100 Class 2 (not automotive) |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, lead-free |
Pinout & Package
LM3S6918-IQC50-A2 is housed in a 100-pin LQFP package with exposed thermal pad (EP). Pin functions are defined by configurable GPIO multiplexing and peripheral assignment registers; all pins support digital I/O, many support alternate functions including Ethernet MII signals, UART, SSI, I²C, and ADC inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply rails | VDD = 3.3 V digital core/io; VDDA = 3.3 V analog; VDDC = 3.3 V for clock circuitry - separate decoupling required |
| PD0–PD7, PE0–PE5, PF0–PF4, PG0–PG7, PH0–PH7, PK0–PK7, PL0–PL7, PM0–PM7, PN0–PN7, PP0–PP7, PQ0–PQ7 | GPIO banks | 10 banks of configurable digital I/O; each supports slew-rate control, weak pull-up/down, and peripheral function mapping |
| RMII_RXD0, RMII_RXD1, RMII_TXD0, RMII_TXD1, RMII_TXEN, RMII_CRS_DV, RMII_REF_CLK | Ethernet MAC interface | Dedicated MII/RMII pins for direct connection to external PHY; RMII mode reduces pin count vs full MII |
| U0RX, U0TX, U1RX, U1TX | UART transceivers | Two independent UARTs; U0 supports IrDA/SIR encoding; both support FIFO and modem control signals |
| SSI0CLK, SSI0FSS, SSI0RX, SSI0TX, SSI1CLK, SSI1FSS, SSI1RX, SSI1TX | Synchronous serial interfaces | Two independent SSI modules supporting SPI, Microwire, and TI synchronous serial protocols |
| I2C0SCL, I2C0SDA | I²C bus interface | Open-drain, 400 kHz fast-mode capable I²C master/slave port with glitch filtering and arbitration |
| ADC0, ADC1, ..., ADC7 | Analog inputs | Eight dedicated ADC input pins mapped to internal 10-bit SAR converter; support single-ended or differential sampling |
| HIB, RTCCLK, HIBRST | Hibernation module | Enable deep-sleep state retention using external battery; RTC continues counting; wake-up via GPIO, RTC match, or external signal |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | IEEE 802.3-compliant MAC with MII/RMII interface eliminates need for external MAC controller in embedded Ethernet nodes |
| Hibernation Mode | 1.7 µA operation with RTC running and 2 KB battery-backed SRAM preserved - enables years-long battery life in remote sensors |
| Peripheral Integration | Single-chip solution includes dual UARTs, two SSI, I²C, 10-bit ADC, PWM-capable timers, and watchdog - reduces BOM count and PCB area |
| Cortex-M3 Architecture | Hardware divide, bit-band addressing, NVIC with 32 priority levels, and MPU enable robust real-time firmware with memory isolation |
| StellarisWare® Support | Production-ready driver library, USB stack, Ethernet stack (uIP/LwIP), and example projects accelerate development for industrial communication applications |
Applications
| Industrial Ethernet Node | Remote Sensor Gateway |
|---|---|
Use Scenario: Standalone PLC I/O module communicating over Modbus TCP on factory floor Ethernet. IC Role / Device Role / Timing Role: Primary MCU executing real-time control logic and handling Ethernet frame assembly/disassembly. Use Value: Integrated MAC reduces latency vs external MAC+MCU solutions; hibernation mode enables maintenance-free operation during scheduled downtime. | Use Scenario: Battery-powered environmental monitor aggregating data from analog sensors and transmitting via Ethernet when mains power is available. IC Role / Device Role / Timing Role: System controller managing ADC sampling, data buffering, and Ethernet link negotiation only during active transmission windows. Use Value: 1.7 µA hibernation current extends 2xAA battery life to >5 years; internal temperature sensor enables self-calibration of analog readings. |
| Networked Motor Controller | Building Automation Panel |
Use Scenario: Compact HVAC actuator with position feedback, local PID loop, and BACnet/IP over Ethernet. IC Role / Device Role / Timing Role: Real-time motion controller with deterministic timer interrupts and Ethernet packet scheduling. Use Value: 50 MHz Cortex-M3 delivers sufficient MIPS for concurrent control + protocol stack; dual UARTs support RS-485 fieldbus and debug console simultaneously. | Use Scenario: Wall-mounted lighting/occupancy panel connecting to building management system via Ethernet. IC Role / Device Role / Timing Role: Human interface processor handling touch input, LED dimming PWM, and periodic status reporting. Use Value: 8-channel ADC reads ambient light, temperature, and occupancy sensor outputs; GPIO flexibility allows direct LED driver interface without external shift registers. |
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, package, and speed; adds CAN controller and removes Ethernet MAC | Better suited for CAN-based industrial networks (e.g., DeviceNet, J1939); lacks native Ethernet capability | Select LM3S6965-IQC50-A2 only if CAN bus integration is required and Ethernet is unnecessary |
| TM4C123GH6PM | Successor generation: Cortex-M4F core, 80 MHz, 256 KB flash, 32 KB SRAM, same 100-pin LQFP, adds FPU and enhanced PWM | Higher performance for floating-point math; backward-compatible register map but requires firmware update for new peripherals | Choose TM4C123GH6PM for new designs needing higher compute throughput or FPU; LM3S6918-IQC50-A2 remains valid for legacy or cost-sensitive Ethernet-only use cases |
Compared with LM3S6965-IQC50-A2, the LM3S6918-IQC50-A2 trades CAN for Ethernet MAC - making it uniquely suitable for wired IP-connected edge devices. Against TM4C123GH6PM, it offers proven stability and lower cost where 50 MHz Cortex-M3 performance and Ethernet are sufficient.
Availability
LM3S6918-IQC50-A2 is available at Aetrix Electronics and suitable for industrial automation, remote monitoring, and building control systems requiring stable component supply, long-term lifecycle support, and production-ready Ethernet connectivity.
Supply support for LM3S6918-IQC50-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 headquartered in Dallas, Texas, delivering analog, embedded processing, and wireless technologies since 1930.
The Stellaris LM3S family was designed specifically for cost-sensitive, Ethernet-enabled industrial microcontroller applications - emphasizing integration, low-power hibernation, and software-ready architecture with StellarisWare®.
FAQ
Does the LM3S6918-IQC50-A2 include an integrated Ethernet PHY?
No, the LM3S6918-IQC50-A2 integrates only the Ethernet MAC layer. An external PHY chip (e.g., DP83848) is required for physical layer signaling. The device provides MII and RMII interfaces to connect to standard 10/100 PHYs. This separation allows design flexibility in selecting PHY features like ESD rating, power consumption, or transformerless operation while retaining the LM3S6918-IQC50-A2's MAC and protocol stack capabilities.
What is the maximum operating frequency of the LM3S6918-IQC50-A2?
The LM3S6918-IQC50-A2 operates at a maximum CPU clock frequency of 50 MHz, as indicated by the "50" suffix in its part number. This frequency is achieved using an internal PLL driven from the main oscillator or an external crystal. All peripherals - including Ethernet MAC, ADC, and UARTs - are fully functional at this rated speed, and timing specifications in the datasheet assume 50 MHz operation unless otherwise noted.
Is the LM3S6918-IQC50-A2 pin-compatible with other LM3S69xx variants?
Yes, the LM3S6918-IQC50-A2 shares the same 100-pin LQFP package and pinout with other LM3S69xx devices in the same package option (e.g., LM3S6965-IQC50-A2), enabling hardware reuse across variants. However, peripheral availability differs: LM3S6918-IQC50-A2 includes Ethernet MAC signals but no CAN, whereas LM3S6965-IQC50-A2 includes CAN but omits Ethernet pins. Unused pins remain GPIO-capable, preserving layout compatibility.
Does the LM3S6918-IQC50-A2 support USB connectivity?
No, the LM3S6918-IQC50-A2 does not include a USB controller or associated PHY circuitry. It lacks dedicated USB D+/D– pins and USB-specific registers. For USB host or device functionality, external bridge ICs (e.g., CP2102, FT232RL) must be used with one of its UARTs. Later Stellaris generations (e.g., LM3S9B92) and the TM4C series added native USB OTG support, but this feature is absent in the LM3S6918-IQC50-A2.
What software development tools are supported for the LM3S6918-IQC50-A2?
The LM3S6918-IQC50-A2 is supported by Texas Instruments' StellarisWare® Peripheral Driver Library, Keil MDK-ARM (with CMSIS), IAR Embedded Workbench, and GCC-based toolchains (e.g., Energia, LM Flash Programmer). TI-provided examples cover Ethernet (uIP, LwIP), ADC sampling, UART communication, and hibernation wakeup - all validated on the original Stellaris DK-LM3S9B92 and EK-LM3S6965 evaluation kits compatible with LM3S6918-IQC50-A2 hardware.
LM3S6918-IQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 6000
- Packaging:
- Tray
- Product Status:
- Active
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S6918-IQC50-A2 FAQ
1.How can I place an order for LM3S6918-IQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6918-IQC50-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-IQC50-A2 reliable?
The price and inventory of LM3S6918-IQC50-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-IQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S6918-IQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6918-IQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6918-IQC50-A2?
LM3S6918-IQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6918-IQC50-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-IQC50-A2?
For technical support, including LM3S6918-IQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6918-IQC50-A2 requirements.
6.How does Aetrix verify that LM3S6918-IQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S6918-IQC50-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-IQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S6918-IQC50-A2?
All LM3S6918-IQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6918-IQC50-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-IQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S6918-IQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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