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Texas Instruments LM3S1918-IQC50-A2T
- Part No.:
- LM3S1918-IQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1918-IQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
LM3S1918-IQC50-A2T 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-A2T datasheet, LM3S1918-IQC50-A2T pinout, LM3S1918-IQC50-A2T application, or LM3S1918-IQC50-A2T equivalent, key selection criteria include hibernation-enabled low-power operation, on-chip RTC with battery-backed memory, and dual UART + I²C + SSI for multi-protocol embedded connectivity in space-constrained industrial designs.
Technical Context
The LM3S1918-IQC50-A2T implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic real-time interrupt handling and memory protection. It integrates a dedicated hibernation module with RTC, battery-backed RAM, and wake-up sources including external pins and RTC match events.
Peripherals include an 8-channel 12-bit ADC with hardware averaging and temperature sensor, two UARTs supporting IrDA/SIR, one I²C master/slave controller, one SSI port, four general-purpose timers (two 32-bit, two 16-bit), and eight GPIO ports with programmable slew rate and drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface and erase/program support |
| SRAM | 64 KB on-chip SRAM, zero-wait-state access at full speed |
| ADC | 12-bit SAR ADC with 8 input channels, 1 MSPS sample rate, internal temperature sensor |
| Hibernation Module | Dedicated power domain with RTC, 2 KB battery-backed RAM, and wake-on-RTC-match or GPIO |
| Communication Interfaces | 2× UART (IrDA/SIR capable), 1× I²C, 1× SSI, all with FIFO and DMA support |
| Timers | 4× general-purpose timers (GPTM): two 32-bit or four 16-bit; supports PWM, capture, RTC mode |
Pinout & Package
LM3S1918-IQC50-A2T is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per TI SPMS033I datasheet Rev I, Section 16 "Pin Diagram" and Table 16-1 "Pin Descriptions".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate analog (VDDA), digital core (VDDC), and I/O (VDD) rails enable noise isolation and flexible power sequencing |
| GND, GNDA, GNDC | Ground returns | Dedicated analog ground (GNDA) and core ground (GNDC) reduce coupling between signal domains |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO bank terminals | Eight configurable GPIO ports (A–H); each pin supports alternate functions (UART, I²C, SSI, timer I/O) |
| USB0VBUS, USB0ID, USB0P, USB0N | USB physical layer interface | Full-speed USB 2.0 device interface with integrated transceiver and pull-up control |
| HIB, RTCCLK, HIBRST | Hibernation control signals | Enable deep-sleep entry, provide RTC clock source, and reset hibernation logic independently of main reset |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Mode Power Consumption | ~1.1 µA typical with RTC running and 2 KB RAM retained - enables years of battery life in remote sensors |
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy over –40°C to +85°C - eliminates external thermal IC in environmental monitors |
| Programmable GPIO Slew Rate | Selectable fast/slow edge rates per pin - reduces EMI in noisy industrial environments without external RC networks |
| Dual UART with IrDA Encoding | Hardware-level pulse shaping and modulation for 38.4 kbps IrDA - enables contactless configuration in medical or sealed enclosures |
| SSI with Multiple Frame Formats | Supports Motorola SPI, TI synchronous serial, and Microwire protocols - interoperates with diverse legacy and proprietary peripherals |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop BLDC motor control in HVAC blowers with thermal monitoring and fault reporting over RS-485. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithms, managing ADC sampling, PWM generation, and UART-based diagnostics. Use Value: Integrated hibernation allows firmware updates during maintenance windows without full power cycle; 50 MHz CPU delivers <10 µs interrupt latency for current-loop timing. | Use Scenario: Battery-powered vibration/temperature node in predictive maintenance systems with monthly data upload via UART-to-LoRa gateway. IC Role / Device Role / Timing Role: Low-power sensor aggregator with RTC-triggered wake-up, ADC acquisition, and burst-mode UART transmission. Use Value: 1.1 µA hibernation current extends 2xAA battery life beyond 3 years; on-chip temperature sensor eliminates calibration overhead. |
| Building Automation Panel | Medical Diagnostic Handheld |
Use Scenario: Touch-enabled HVAC control panel with local display, button inputs, and BACnet MS/TP communication over UART. IC Role / Device Role / Timing Role: Human interface processor handling touch scan, LED/PWM dimming, and protocol translation between UI and field bus. Use Value: Eight GPIO ports support direct matrix keypad scanning and RGB LED control; dual UARTs allow simultaneous UI debug and field bus traffic. | Use Scenario: Portable blood glucose meter requiring FDA-compliant firmware updates, secure data logging, and IR-based patient data transfer. IC Role / Device Role / Timing Role: Safety-critical application controller managing sensor excitation, ADC conversion, EEPROM logging, and IrDA host communication. Use Value: MPU-enforced memory protection isolates bootloader from application; hardware IrDA encoder ensures reliable 38.4 kbps data exchange with clinic PCs. |
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-byte hibernation RAM, no USB PHY | Suitable for cost-sensitive, non-USB, lower-code-footprint designs like simple thermostats | Select when USB and >128 KB flash are unnecessary; retains same peripheral set except USB and hibernation RAM size |
| TM4C123GH6PM | Successor family with 256 KB flash, 32 KB SRAM, enhanced FPU, and updated hibernation (2 KB RAM), but different pinout and register mapping | Required for new designs needing FPU, CAN, or extended lifecycle support post-2018 | Choose for long-term design continuity; not drop-in compatible due to pinout and driver changes - requires PCB and firmware rework |
Compared with LM3S1918-IQC50-A2T, LM3S811-IQN50-A2 offers reduced memory and no USB at lower cost for simpler tasks, while TM4C123GH6PM provides modernized peripherals and FPU but demands full redesign - making LM3S1918-IQC50-A2T optimal for legacy-compatible, USB-integrated, hibernation-critical industrial controllers.
Availability
LM3S1918-IQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, building automation panels, and medical diagnostic handhelds requiring stable component supply and long-lifecycle support.
Supply support for LM3S1918-IQC50-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, specializing in analog, embedded processing, and wireless technologies with over 50 years of innovation in industrial and automotive electronics.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications demanding low-power operation, rich analog integration, and deterministic interrupt response - targeting industrial automation, building controls, and portable instrumentation.
FAQ
What is the maximum operating frequency of the LM3S1918-IQC50-A2T?
The LM3S1918-IQC50-A2T operates at a maximum system clock frequency of 50 MHz, as confirmed by its "-IQC50" suffix and the SPMS033I datasheet Section 5.2.4. This frequency is achieved using the internal PLL with an external crystal or oscillator input, and all peripherals-including ADC, UARTs, and timers-are fully functional at this speed without wait states.
Does the LM3S1918-IQC50-A2T include USB functionality?
Yes, the LM3S1918-IQC50-A2T integrates a full-speed USB 2.0 device controller with on-chip transceiver, supporting USB device enumeration and data transfer at 12 Mbps. Pins USB0P and USB0N are dedicated differential I/Os, and USB0VBUS monitoring enables host-detection capability - all documented in Section 17 of the SPMS033I datasheet.
What is the hibernation current specification for the LM3S1918-IQC50-A2T?
The LM3S1918-IQC50-A2T achieves a typical hibernation current of 1.1 µA when the hibernation module is active with RTC running and 2 KB of battery-backed RAM retained. This value is measured under specified conditions (VDD = 3.3 V, TA = 25°C) and appears in the Electrical Characteristics table (Section 3.3) of the SPMS033I datasheet.
How many ADC channels does the LM3S1918-IQC50-A2T support, and what is its resolution?
The LM3S1918-IQC50-A2T features a single 12-bit successive-approximation ADC with eight analog input channels (AIN0–AIN7), as detailed in Section 11 of the SPMS033I datasheet. It supports hardware sample averaging across up to 64 samples and includes an internal temperature sensor accessible via AIN11.
Is the LM3S1918-IQC50-A2T pin-compatible with other Stellaris LM3S devices?
No, the LM3S1918-IQC50-A2T is not universally pin-compatible across the LM3S family. While it shares the 100-pin LQFP package with some variants (e.g., LM3S8962), differences in peripheral mapping - particularly USB, hibernation, and GPIO alternate functions - require verification against individual datasheet pin diagrams. The LM3S1918-IQC50-A2T pinout is unique to its feature set and must be used as defined in Section 16 of SPMS033I.
LM3S1918-IQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1918-IQC50-A2T FAQ
1.How can I place an order for LM3S1918-IQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1918-IQC50-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 LM3S1918-IQC50-A2T reliable?
The price and inventory of LM3S1918-IQC50-A2T 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-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1918-IQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1918-IQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1918-IQC50-A2T?
LM3S1918-IQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1918-IQC50-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 LM3S1918-IQC50-A2T?
For technical support, including LM3S1918-IQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1918-IQC50-A2T requirements.
6.How does Aetrix verify that LM3S1918-IQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1918-IQC50-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 LM3S1918-IQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1918-IQC50-A2T?
All LM3S1918-IQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1918-IQC50-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 LM3S1918-IQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S1918-IQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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