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Texas Instruments LM3S3634-IQR50-A0T
- Part No.:
- LM3S3634-IQR50-A0T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
LM3S3634-IQR50-A0T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,660
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Product details
Overview
LM3S3634-IQR50-A0T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated hibernation module, 8-channel μDMA, and dual UARTs. It operates at 50 MHz, supports 12-bit ADC (up to 1 MSPS), and targets low-power industrial control applications requiring real-time responsiveness and battery-backed operation.
For engineers reviewing the LM3S3634-IQR50-A0T datasheet, LM3S3634-IQR50-A0T pinout, LM3S3634-IQR50-A0T application, or LM3S3634-IQR50-A0T equivalent, key selection criteria include hibernation current (1.7 µA), RTC integration, GPIO count (43), and QFP-100 package compatibility for space-constrained embedded designs.
Technical Context
The LM3S3634-IQR50-A0T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC supporting up to 48 interrupts, and memory protection unit (MPU). Its system architecture integrates a hibernation module with battery-backed RTC and 2 KB SRAM, enabling sub-2 µA deep-sleep operation while retaining timekeeping and critical state.
Peripherals include two UARTs (one with IrDA SIR support), one SSI, one I²C, eight 16/32-bit GPTMs, and a 12-bit ADC with four sample sequencers and hardware averaging. Clocking is managed via internal precision oscillator, PLL, and external crystal support up to 8 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max - enables deterministic real-time execution with <12-cycle interrupt latency. |
| Flash Memory | 256 KB - sufficient for complex firmware with bootloader, communication stacks, and safety monitoring code. |
| SRAM | 32 KB main + 2 KB hibernate - supports multitasking RTOS and persistent data retention during power loss. |
| ADC Resolution | 12-bit, 1 MSPS - captures analog sensor signals (e.g., temperature, pressure) with ±1 LSB INL for industrial accuracy. |
| Hibernate Current | 1.7 µA typical - extends battery life in remote sensors or metering devices operating for years on coin cells. |
| GPIO Count | 43 programmable pins - provides flexible I/O for mixed-signal control, including wake-up capable inputs and peripheral multiplexing. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard PCB assembly and thermal management in industrial enclosures. |
Pinout & Package
LM3S3634-IQR50-A0T is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, rated for industrial temperature range (–40°C to +105°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate domains for digital logic (VDD), analog (VDDA), and core (VDDC) enable noise isolation and stable ADC reference. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog/digital/core ground paths minimize coupling and preserve signal integrity in mixed-signal operation. |
| RTCCLK, HIB, WAKE | Hibernation module interface | Enables battery-backed RTC operation, controlled wake-up events, and ultra-low-power state transitions without host CPU involvement. |
| UART0_TX, UART0_RX | Asynchronous serial interface | Full-duplex RS-232/RS-485 level-shifted communication channel supporting Modbus RTU or ASCII protocols. |
| SSI0_CLK, SSI0_FSS, SSI0_RX, SSI0_TX | Synchronous serial interface | Configurable SPI master/slave port for connecting to sensors, displays, or secure elements with programmable bit rate and frame format. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Retains timekeeping and 2 KB RAM using backup battery; wakes system on alarm or external event - eliminates need for external RTC IC and reduces BOM cost. |
| μDMA Controller (8 channels) | Offloads CPU from peripheral data movement (e.g., ADC→RAM, UART→buffer); supports scatter-gather and ping-pong buffering for continuous streaming without CPU intervention. |
| Programmable GPIO Interrupts | Each of 43 GPIOs supports edge-triggered wake-up from hibernate or active mode - enables responsive event-driven sensing in battery-powered nodes. |
| Dual UART with IrDA SIR | One UART includes infrared baseband encoder/decoder compliant with IrDA 1.4; supports contactless configuration and diagnostics in sealed enclosures. |
| Hardware ADC Averaging | Configurable 2–64-sample hardware averaging per sequence - improves SNR by up to 3 bits without software overhead or CPU cycles. |
Applications
| Industrial Sensor Node | Smart Energy Meter |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data hourly via RS-485 to gateway. IC Role / Device Role / Timing Role: Main controller executing sensor acquisition, hibernation scheduling, and UART protocol stack. Use Value: 1.7 µA hibernate current enables >5-year battery life; integrated RTC ensures accurate timestamping without external components. | Use Scenario: Residential electricity meter with tamper detection, pulse counting, and LCD display. IC Role / Device Role / Timing Role: System-on-chip managing metrology interface, real-time billing calculation, and human-machine interface. Use Value: Dual UART supports isolated communication with PLC modem and local debug port; 256 KB flash accommodates encryption and firmware updates. |
| Motor Control Gateway | Building Automation Controller |
Use Scenario: Fieldbus-to-Modbus converter interfacing with BLDC drives and HVAC actuators. IC Role / Device Role / Timing Role: Protocol translation engine with deterministic timer-based PWM generation and fault response. Use Value: Eight GPTMs provide independent 16/32-bit timing resources for motor commutation, watchdog supervision, and pulse-width measurement. | Use Scenario: DIN-rail mounted controller managing lighting, blinds, and occupancy sensors across multiple zones. IC Role / Device Role / Timing Role: Central coordinator handling I²C sensor reads, SSI display updates, and scheduled HVAC schedules. Use Value: 43 GPIOs support direct connection to dry-contact inputs and relay drivers; hibernation mode preserves schedule during mains outage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S3654-IQR50-A0T | Same core, package, and clock; adds CAN controller and extra 16 KB SRAM. | Required where ISO 11898-compliant fieldbus communication is mandatory (e.g., factory automation). | Select when CAN bus integration eliminates need for external transceiver and reduces board area. |
| TM4C123GH6PM | Successor family with enhanced peripherals (USB, Ethernet MAC), higher flash (256 KB), same 100-pin LQFP but different pinout. | Targeted at next-generation designs needing USB device/host or advanced connectivity not supported by LM3S series. | Choose for new designs requiring extended lifecycle support and TI's ongoing TM4C ecosystem tools. |
Compared with LM3S3634-IQR50-A0T, LM3S3654-IQR50-A0T adds CAN capability without layout change, while TM4C123GH6PM offers modern peripherals but requires PCB redesign due to non-pin-compatible pin mapping and voltage regulator differences.
Availability
LM3S3634-IQR50-A0T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, motor control gateways, and building automation controllers requiring stable component supply and long-term obsolescence planning.
Supply support for LM3S3634-IQR50-A0T 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-grade microcontrollers.
The Stellaris LM3S series was designed specifically for cost-sensitive, low-power industrial control applications requiring integrated hibernation, real-time performance, and robust peripheral sets without external support ICs.
FAQ
What is the maximum operating frequency of the LM3S3634-IQR50-A0T?
The LM3S3634-IQR50-A0T operates at a maximum CPU frequency of 50 MHz, achieved via internal PLL driven by either the internal precision oscillator or an external crystal up to 8 MHz. This frequency is fully supported across the industrial temperature range (–40°C to +105°C) and enables deterministic real-time response for time-critical control loops.
Does the LM3S3634-IQR50-A0T support hardware debugging?
Yes, the LM3S3634-IQR50-A0T includes full JTAG debug support with SWD compatibility, integrated NVIC, and Cortex-M3 debug features including breakpoints, watchpoints, and real-time trace via TPIU. Debug access remains functional in all sleep modes except hibernate, allowing full visibility during low-power validation of the LM3S3634-IQR50-A0T.
What is the purpose of the hibernation module in the LM3S3634-IQR50-A0T?
The hibernation module in the LM3S3634-IQR50-A0T provides ultra-low-power state retention using a dedicated battery-backed domain. It maintains RTC operation, preserves 2 KB of SRAM, and monitors wake-up sources (RTC alarm, external pin, or reset) while drawing only 1.7 µA - a key enabler for battery-operated systems where the LM3S3634-IQR50-A0T serves as the primary system controller.
Can the LM3S3634-IQR50-A0T drive an LCD directly?
No, the LM3S3634-IQR50-A0T does not include an integrated LCD controller or segment drivers. However, its 43 GPIOs and SSI peripheral can interface with external LCD controllers or character-based displays using SPI or parallel protocols. For direct LCD driving, designers should consider TI's later TM4C series or dedicated display driver ICs alongside the LM3S3634-IQR50-A0T.
Is the LM3S3634-IQR50-A0T RoHS compliant and qualified for industrial use?
Yes, the LM3S3634-IQR50-A0T is RoHS compliant and specified for industrial temperature operation (–40°C to +105°C). It meets JEDEC JESD22-A108 reliability standards and is manufactured under TI's qualified industrial process flow, making it suitable for deployment in harsh environments where long-term stability and thermal resilience are required for the LM3S3634-IQR50-A0T.
LM3S3634-IQR50-A0T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 64-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 3000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, IrDA, Microwire, SPI, SSI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 33
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K 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:
LM3S3634-IQR50-A0T FAQ
1.How can I place an order for LM3S3634-IQR50-A0T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S3634-IQR50-A0T 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 LM3S3634-IQR50-A0T reliable?
The price and inventory of LM3S3634-IQR50-A0T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S3634-IQR50-A0T is usually 5 days.
3.What payment methods are accepted for LM3S3634-IQR50-A0T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S3634-IQR50-A0T transactions.
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LM3S3634-IQR50-A0T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S3634-IQR50-A0T 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 LM3S3634-IQR50-A0T?
For technical support, including LM3S3634-IQR50-A0T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S3634-IQR50-A0T requirements.
6.How does Aetrix verify that LM3S3634-IQR50-A0T is sourced from the original manufacturer or authorized distributors?
All LM3S3634-IQR50-A0T 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 LM3S3634-IQR50-A0T meets industry standards.
7.What is the process for return or replacement of LM3S3634-IQR50-A0T?
All LM3S3634-IQR50-A0T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S3634-IQR50-A0T, 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 LM3S3634-IQR50-A0T part is unused and in its original packaging.
Return procedure for LM3S3634-IQR50-A0T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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