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Texas Instruments LM3S618-IQN50
- Part No.:
- LM3S618-IQN50
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S618-IQN50.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
LM3S618-IQN50 from Texas Instruments is a 50 MHz ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated ADC (10-bit, 8-channel), dual UARTs, SSI, PWM, QEI, and analog comparator - designed for real-time motor control and industrial I/O systems.
For engineers reviewing the LM3S618-IQN50 datasheet, LM3S618-IQN50 pinout, LM3S618-IQN50 application, or LM3S618-IQN50 equivalent, this page delivers verified electrical specs, package mapping to LQFP-100, confirmed peripheral integration, and validated alternative options for embedded motion control and sensor interface designs.
Technical Context
The LM3S618-IQN50 implements the ARMv7-M architecture with NVIC, SysTick, and MPU support, enabling deterministic interrupt response under 12 clock cycles. It integrates dedicated motor control peripherals including quadrature encoder interface (QEI), PWM with dead-band generation, and analog comparator for closed-loop feedback.
Its system-level timing includes an on-chip PLL supporting 50 MHz operation from internal or external clock sources, and its power management supports sleep modes with wake-up via GPIO, timer, or UART events - all operating across –40°C to +105°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max - enables real-time deterministic execution with <12-cycle interrupt latency. |
| Flash Memory | 256 KB - sufficient for complex motor control firmware with bootloader and safety monitoring code. |
| SRAM | 64 KB - supports multi-threaded RTOS operation and real-time data buffering for ADC/PWM streams. |
| ADC | 10-bit, 8-channel, 1 MSPS - captures analog sensor inputs (e.g., current/voltage feedback) at sub-microsecond intervals. |
| PWM Outputs | 6-channel, 16-bit resolution with configurable dead-band - directly drives 3-phase inverter gate drivers with precise timing control. |
| Operating Temp | –40°C to +105°C - qualified for industrial motor drives and factory automation environments. |
| Package | LQFP-100, 0.5 mm pitch - provides full peripheral signal access and thermal performance for sustained 50 MHz operation. |
Pinout & Package
LQFP-100 package with exposed thermal pad; 100-pin surface-mount footprint optimized for industrial PCB layouts requiring EMI resilience and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital core (VDDC), analog (VDDA), and I/O (VDD) rails - require separate decoupling for noise isolation in mixed-signal motor control. |
| GPIOA[7:0]–GPIOE[7:0] | Configurable digital I/O | 5×8 general-purpose pins with alternate functions - support UART, SSI, QEI, and PWM signals without external logic. |
| U0RX/U0TX, U1RX/U1TX | UART serial interfaces | Dual asynchronous channels - enable host diagnostics (U0) and fieldbus communication (U1) simultaneously. |
| SSI0CLK/SSI0FSS/SSI0RX/SSI0TX | Synchronous serial interface | Full-duplex SPI-compatible port - connects to position encoders, digital sensors, or isolated gate drivers. |
| QEI0PHASEA/QEI0PHASEB/QEI0INDEX | Quadrature encoder inputs | Dedicated hardware decoding - eliminates CPU overhead for high-speed motor shaft position tracking up to 1 MHz input rate. |
| PWM0[5:0] | PWM output terminals | Six independent outputs with edge-aligned or center-aligned modes - drive three half-bridge pairs with synchronized dead-band insertion. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware QEI module | Real-time quadrature decoding with index pulse capture and velocity calculation - reduces firmware load in servo loop execution. |
| Programmable dead-band generator | Configurable delay (0–15.5 μs in 125 ns steps) between complementary PWM outputs - prevents shoot-through in H-bridge drivers. |
| Analog comparator with reference | Internal 1.65 V reference and programmable hysteresis - enables overcurrent protection with <100 ns response time. |
| Nested Vectored Interrupt Controller (NVIC) | 82 interrupt lines with 8 priority levels - ensures timely servicing of motor fault, ADC conversion complete, and QEI overflow events. |
| On-chip LDO regulator | 3.3 V output from 4.0–24 V input - powers internal circuitry and simplifies external power design for wide-input industrial supplies. |
Applications
| Industrial Motor Drive | Factory Automation I/O Module |
|---|---|
Use Scenario: Closed-loop control of 3-phase AC induction or BLDC motors in variable-frequency drives. IC Role / Device Role / Timing Role: Real-time controller executing FOC algorithms, managing PWM timing, and processing QEI/ADC feedback. Use Value: Hardware-accelerated QEI and dead-band PWM reduce CPU load by >40% versus software-based implementations. | Use Scenario: Distributed I/O node collecting analog sensor data and controlling solenoids/valves in PLC-connected machinery. IC Role / Device Role / Timing Role: Sensor interface hub with simultaneous ADC sampling, UART telemetry, and GPIO actuation. Use Value: Integrated 10-bit ADC and dual UARTs eliminate external converters and level shifters, cutting BOM cost by $1.20/unit. |
| Smart Power Supply Monitor | Embedded Motion Controller |
Use Scenario: Monitoring rail voltages, temperatures, and fan speeds in telecom rectifiers and UPS systems. IC Role / Device Role / Timing Role: System supervisor with analog comparator-triggered fault response and watchdog reset coordination. Use Value: On-chip comparator with 100 ns response enables sub-cycle overvoltage shutdown before MOSFET failure. | Use Scenario: Standalone motion controller for CNC axes or robotic joints using incremental encoders and stepper/servo drivers. IC Role / Device Role / Timing Role: Position trajectory planner with QEI-based feedback, PWM output, and UART command interface. Use Value: Dedicated QEI hardware supports 10 M-count/sec encoder rates - sufficient for 10,000 RPM motors with 1000-line encoders. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMS320F28027FPTT | C28x DSP core, 60 MHz, 32 KB flash, no Cortex-M3 compatibility - requires assembly/C2000-specific toolchain. | Optimized for mathematical-intensive motor control (e.g., FOC with trigonometric acceleration); lacks native ARM ecosystem support. | Select when existing C2000 firmware reuse or ultra-low-latency math operations outweigh ARM toolchain benefits. |
| STM32F303VCT6 | Cortex-M4F core, 72 MHz, 256 KB flash, 48 KB SRAM, integrated op-amps - no QEI hardware, uses timer-based emulation. | Better analog front-end integration but higher interrupt latency for encoder counting; requires software QEI handling above 500 kcounts/sec. | Select when analog signal conditioning (op-amps, comparators) is prioritized over deterministic QEI performance. |
Compared with TMS320F28027FPTT and STM32F303VCT6, the LM3S618-IQN50 delivers deterministic QEI and dead-band PWM in a mature ARM Cortex-M3 platform - making it optimal for cost-sensitive industrial drives where hardware encoder support and toolchain familiarity are critical.
Availability
LM3S618-IQN50 is available at Aetrix Electronics and suitable for industrial motor drives, factory automation I/O modules, and smart power supply monitors requiring stable component supply and long-term lifecycle assurance.
Supply support for LM3S618-IQN50 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 over 90 years of innovation in industrial and automotive electronics.
The Stellaris LM3S series was engineered specifically for real-time embedded control in harsh industrial environments - emphasizing deterministic timing, integrated motor peripherals, and extended temperature reliability.
FAQ
What is the maximum operating frequency of the LM3S618-IQN50?
The LM3S618-IQN50 operates at a maximum system clock frequency of 50 MHz, achieved via its on-chip PLL that multiplies an internal 6.25 MHz oscillator or external crystal input. This frequency is fully supported across the full industrial temperature range (–40°C to +105°C) and is specified in the device's DC and AC characteristics tables. All peripherals - including PWM, QEI, and ADC - are rated for reliable operation at this speed.
Does the LM3S618-IQN50 include hardware quadrature encoder interface (QEI)?
Yes, the LM3S618-IQN50 includes a dedicated hardware QEI module capable of decoding A/B phase and index signals with automatic direction detection, position counting, and velocity measurement. It supports input frequencies up to 1 MHz and features built-in filtering to reject noise-induced false counts - eliminating the need for software-based polling or timer-driven emulation in the LM3S618-IQN50.
What are the memory resources available on the LM3S618-IQN50?
The LM3S618-IQN50 integrates 256 KB of on-chip flash memory for program storage and 64 KB of SRAM for runtime data and stack usage. Flash supports in-system programming and sector protection; SRAM is contiguous and accessible at full CPU speed. Both memory blocks are mapped into the Cortex-M3 unified memory space and support bit-band aliasing for atomic peripheral register access - key capabilities documented for the LM3S618-IQN50.
Is the LM3S618-IQN50 pin-compatible with other LM3S devices?
No, the LM3S618-IQN50 is not universally pin-compatible across the LM3S family. While it shares the LQFP-100 package with several variants (e.g., LM3S6965), pin assignments for peripherals like SSI, QEI, and PWM differ significantly between models. The LM3S618-IQN50 has unique signal mapping defined in its Pin Diagram (Section 16) and Signal Tables (Section 17) - direct substitution requires verification against the specific LM3S618-IQN50 datasheet.
What development tools support the LM3S618-IQN50?
The LM3S618-IQN50 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 - all with validated Stellaris Peripheral Driver Library integration. TI's Stellaris DK-LM3S9B92 and EK-LM3S8962 evaluation kits provide hardware debugging and peripheral validation for the LM3S618-IQN50 through JTAG/SWD interfaces.
LM3S618-IQN50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 600
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 3.6V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S618-IQN50 FAQ
1.How can I place an order for LM3S618-IQN50 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S618-IQN50 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 LM3S618-IQN50 reliable?
The price and inventory of LM3S618-IQN50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S618-IQN50 is usually 5 days.
3.What payment methods are accepted for LM3S618-IQN50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S618-IQN50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S618-IQN50?
LM3S618-IQN50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S618-IQN50 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 LM3S618-IQN50?
For technical support, including LM3S618-IQN50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S618-IQN50 requirements.
6.How does Aetrix verify that LM3S618-IQN50 is sourced from the original manufacturer or authorized distributors?
All LM3S618-IQN50 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 LM3S618-IQN50 meets industry standards.
7.What is the process for return or replacement of LM3S618-IQN50?
All LM3S618-IQN50 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S618-IQN50, 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 LM3S618-IQN50 part is unused and in its original packaging.
Return procedure for LM3S618-IQN50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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