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Texas Instruments LM3S1918-IQC50-A2
- Part No.:
- LM3S1918-IQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1918-IQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,788
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Product details
Overview
LM3S1918-IQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (8-channel), dual UARTs, I²C, SSI, and PWM-capable timers. It operates at up to 50 MHz and supports industrial motor control and sensor interface applications.
For engineers reviewing the LM3S1918-IQC50-A2 datasheet, LM3S1918-IQC50-A2 pinout, LM3S1918-IQC50-A2 application, or LM3S1918-IQC50-A2 equivalent, key selection criteria include hibernation-enabled low-power operation, on-chip RTC with battery-backed memory, and peripheral integration for real-time embedded control without external timing or power management ICs.
Technical Context
The LM3S1918-IQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic real-time execution. Its hibernation module includes a 32.768-kHz RTC, battery-backed 256-byte RAM, and wake-up capability via GPIO or RTC match.
Peripherals are clock-gated and configurable via system control registers; ADC supports hardware averaging and temperature sensing; UARTs include IrDA/SIR support and 16-byte FIFOs; all timers support one-shot, periodic, PWM, and input capture modes with flexible prescaling.
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 | 12-bit SAR ADC with 8 single-ended or 4 differential inputs, 1 MSPS sample rate, internal temperature sensor |
| Timers | Two 32-bit or four 16-bit general-purpose timers; one 32-bit RTC timer with hibernation support |
| Communication | Dual UARTs (IrDA/SIR capable), one I²C master/slave, one SSI (SPI/SSI/Microwire) |
| Hibernation | Dedicated hibernation module with 32.768 kHz RTC, battery-backed 256 B RAM, GPIO/RTC wake-up sources |
| Package | 100-pin LQFP (14 mm × 14 mm), 0.5 mm pitch, RoHS-compliant |
Pinout & Package
LM3S1918-IQC50-A2 is housed in a 100-pin LQFP package (JEDEC MO-152AC) with exposed thermal pad. Pin functions are organized into GPIO banks (A–G), analog inputs (AIN0–AIN7), crystal oscillator (XIN/XOUT), JTAG debug (TCK/TMS/TDI/TDO/nTRST), and power/ground rails.
| 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 PLL stability |
| GND, GNDA, GNDC | Ground returns | Dedicated analog (GNDA) and core (GNDC) grounds reduce coupling between signal domains |
| XIN / XOUT | Crystal oscillator terminals | Supports 1–25 MHz crystal or external clock; enables precise timing for RTC and system clock generation |
| PA0–PA7, PB0–PB7, etc. | GPIO bank pins | Configurable as digital I/O, alternate function (UART, SSI, I²C), or analog input (AIN0–AIN7) |
| TCK / TMS / TDI / TDO / nTRST | JTAG debug interface | Full IEEE 1149.1 boundary-scan and SWD-compatible debug access for firmware development and validation |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module | Enables sub-μA sleep current with RTC and 256 B battery-backed RAM retention-critical for battery-powered remote sensors |
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy over –40°C to +85°C, eliminating need for external thermal monitoring ICs |
| Dual UART with IrDA/SIR | Supports infrared communication and serial protocol bridging without external transceivers or level shifters |
| Hardware ADC Averaging | Configurable 2–64-sample hardware averaging reduces software overhead and improves SNR for noisy industrial analog signals |
| Peripheral Clock Gating | Individual enable/disable control per peripheral reduces dynamic power by disabling unused blocks-essential for energy-constrained designs |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop BLDC motor drive with current sensing, commutation logic, and fault protection. IC Role / Device Role / Timing Role: Real-time controller executing FOC algorithms, managing PWM outputs, sampling ADC channels, and handling overcurrent interrupts. Use Value: Integrated hibernation and RTC allow scheduled wake-up for periodic diagnostics; 50 MHz CPU ensures <1 μs interrupt latency for safety-critical fault response. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and pressure with wireless upload. IC Role / Device Role / Timing Role: System-on-chip host managing sensor interfaces, data logging, low-power scheduling, and UART-based RF module control. Use Value: Sub-10 μA hibernation current extends battery life to >5 years; on-chip temperature sensor eliminates calibration drift from external components. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Equipment |
Use Scenario: DIN-rail mounted I/O expansion unit with isolated digital inputs, analog inputs, and RS-485 communication. IC Role / Device Role / Timing Role: Central processor for signal conditioning, protocol translation (Modbus RTU over UART), and watchdog-managed firmware updates. Use Value: Dual UARTs support simultaneous host communication and fieldbus interface; hardware CRC engine offloads checksum computation from CPU. | Use Scenario: Portable ECG or pulse oximeter requiring precise analog front-end timing and low-noise signal acquisition. IC Role / Device Role / Timing Role: Signal acquisition controller synchronizing ADC sampling, filtering, and secure data export via UART or USB (with external PHY). Use Value: 12-bit ADC with hardware averaging achieves >10-bit effective resolution at 1 kSPS; separate VDDA/GNDA rails minimize digital switching noise on analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S811-IQN50-A2 | Same Cortex-M3 core, but only 64 KB flash, 256 KB SRAM, no hibernation module or RTC | Lacks battery-backed RTC and low-power hibernation-unsuitable for long-term unattended operation | Select LM3S1918-IQC50-A2 when hibernation, RTC, and larger flash are required for firmware updates and time-stamped logging |
| TM4C123GH6PM | Successor family with enhanced peripherals (USB, CAN), 80 MHz CPU, 256 KB flash, same 100-pin LQFP package | Includes USB OTG and CAN FD; requires updated BSP and toolchain; not drop-in compatible due to register map changes | Choose TM4C123GH6PM for new designs needing USB connectivity or automotive-grade CAN; LM3S1918-IQC50-A2 remains optimal for legacy hibernation-critical deployments |
Compared with LM3S811-IQN50-A2, the LM3S1918-IQC50-A2 adds hibernation and doubles flash capacity-enabling secure OTA updates and extended data buffering. Against TM4C123GH6PM, it trades newer features for proven low-power reliability in field-deployed sensor nodes where USB/CAN are unnecessary.
Availability
LM3S1918-IQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and portable medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1918-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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive microcontrollers.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications demanding integrated analog, low-power hibernation, and deterministic interrupt response-targeting industrial automation and sensor edge nodes.
FAQ
What is the maximum operating frequency of the LM3S1918-IQC50-A2?
The LM3S1918-IQC50-A2 operates at a maximum system clock frequency of 50 MHz. This is achieved using an internal PLL that multiplies the input crystal or external clock source. The device maintains full specification compliance-including ADC performance, UART baud accuracy, and GPIO toggle speed-at this rated frequency across the industrial temperature range (–40°C to +85°C). The LM3S1918-IQC50-A2 does not support overclocking beyond 50 MHz.
Does the LM3S1918-IQC50-A2 support hardware debugging via JTAG?
Yes, the LM3S1918-IQC50-A2 includes a full IEEE 1149.1-compliant JTAG interface with five dedicated pins (TCK, TMS, TDI, TDO, and nTRST). It supports boundary-scan testing, flash programming, and real-time debugging via TI's Code Composer Studio and third-party tools like Segger J-Link. The LM3S1918-IQC50-A2 also supports Serial Wire Debug (SWD) mode using the same physical pins, enabling compact debug probe connections without sacrificing functionality.
What power-saving features does the LM3S1918-IQC50-A2 offer?
The LM3S1918-IQC50-A2 integrates a dedicated hibernation module that achieves sub-10 µA sleep current while retaining RTC operation and 256 bytes of battery-backed RAM. It supports multiple low-power modes including sleep, deep-sleep, and hibernate-with wake-up sources including GPIO edges, RTC alarm, and external interrupts. The LM3S1918-IQC50-A2 uses clock gating per peripheral and voltage scaling to minimize active power, making it suitable for battery-operated field instruments where runtime exceeds one year.
Can the LM3S1918-IQC50-A2's ADC measure temperature directly?
Yes, the LM3S1918-IQC50-A2 includes an internal temperature sensor connected to ADC channel AIN6. When enabled, it provides calibrated readings across –40°C to +85°C with ±3°C typical accuracy, requiring no external components. The LM3S1918-IQC50-A2 firmware can read this channel alongside other analog inputs using the same ADC sequencer and hardware averaging-enabling system-level thermal monitoring without adding BOM cost or board space.
Is the LM3S1918-IQC50-A2 pin-compatible with other Stellaris devices?
No, the LM3S1918-IQC50-A2 is not universally pin-compatible across the Stellaris family. While it shares the 100-pin LQFP package with some variants (e.g., LM3S811-IQN50-A2), pin functions differ significantly-especially for analog inputs, hibernation signals, and peripheral mappings. The LM3S1918-IQC50-A2 reserves specific pins for hibernation control (HIBRST, HIBACK) and RTC crystal (XRTCO), which are absent or repurposed in non-hibernation variants. PCB layout must be verified against the LM3S1918-IQC50-A2-specific pin diagram.
LM3S1918-IQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 52
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1918-IQC50-A2 FAQ
1.How can I place an order for LM3S1918-IQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1918-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 LM3S1918-IQC50-A2 reliable?
The price and inventory of LM3S1918-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 LM3S1918-IQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1918-IQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1918-IQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1918-IQC50-A2?
LM3S1918-IQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1918-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 LM3S1918-IQC50-A2?
For technical support, including LM3S1918-IQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1918-IQC50-A2 requirements.
6.How does Aetrix verify that LM3S1918-IQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1918-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 LM3S1918-IQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1918-IQC50-A2?
All LM3S1918-IQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1918-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 LM3S1918-IQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1918-IQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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