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Texas Instruments LM3S3749-IQC50-A0T
- Part No.:
- LM3S3749-IQC50-A0T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S3749-IQC50-A0T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,833
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Product details
Overview
LM3S3749-IQC50-A0T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated USB 2.0 device controller, 12-bit ADC (8-channel), dual UARTs, SSI, I²C, PWM, 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 motor control, industrial automation, and embedded USB peripherals.
For engineers reviewing the LM3S3749-IQC50-A0T datasheet, LM3S3749-IQC50-A0T pinout, LM3S3749-IQC50-A0T application, or LM3S3749-IQC50-A0T equivalent, key selection criteria include USB device stack support, hibernation-enabled low-power operation, integrated analog front-end, deterministic real-time interrupt latency, and TI's StellarisWare® peripheral driver library compatibility.
Technical Context
The LM3S3749-IQC50-A0T implements the ARM Cortex-M3 core with NVIC supporting up to 64 interrupt lines, 3-stage pipeline, and Thumb-2 instruction set. Its system-level integration includes a hibernation module with RTC, battery-backed memory, and wake-on-external-event capability - enabling sub-5 µA sleep current.
Peripherals are memory-mapped and clock-gated per module; the μDMA controller supports 32 channels with scatter-gather and ping-pong buffering. The ADC features hardware averaging across 4–64 samples and differential input mode on selected channels, while the USB controller complies with USB 2.0 full-speed specification and supports control, bulk, and interrupt transfer types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max - delivers deterministic real-time response with <12-cycle interrupt latency. |
| Flash / SRAM | 256 KB flash / 64 KB SRAM - sufficient for USB device stack + application firmware with room for field updates. |
| ADC | 12-bit, 1 MSPS, 8-channel - supports simultaneous sampling of motor phase currents or sensor arrays. |
| USB Interface | Full-speed (12 Mbps) device-only controller - enables HID, CDC, or mass storage class without external PHY. |
| Hibernation Current | ≤5 µA with RTC active - extends battery life in remote sensors or portable industrial tools. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard PCB assembly and thermal management for industrial ambient. |
| Temperature Range | –40°C to +85°C - qualified for use in factory-floor PLC modules and outdoor metering equipment. |
Pinout & Package
LM3S3749-IQC50-A0T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with exposed thermal pad, JEDEC MS-026AC compliant. Pinout validated per TI SPMS086H datasheet Rev H (July 2014), Table 4-1 through Table 4-12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VDDA / VDDUSB | Power supply inputs | Separate domains for digital logic (VDD), analog (VDDA), and USB PHY (VDDUSB) - enable noise isolation and independent power sequencing. |
| USB0_P / USB0_M | Differential USB data pair | Direct connection to USB connector; internal pull-ups enabled for device enumeration without external resistors. |
| PH0 / PH1 | USB0 ID / VBUS sense | Supports OTG-capable detection logic; allows host/device role negotiation when used with appropriate firmware. |
| PD0–PD7 | ADC0 inputs (AIN0–AIN7) | Configurable as single-ended or differential pairs; AIN0–AIN3 support internal temperature sensor routing. |
| PC4–PC7 | PWM0 outputs (PWM0–PWM3) | Complementary output pairs with dead-time insertion - suitable for 3-phase motor gate drive control. |
| PF0–PF4 | Hibernate wake sources | Support external interrupt wake from hibernation using GPIO, RTC match, or external event on PF0–PF4. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Enables ultra-low-power operation (<5 µA) with timekeeping and wake-on-alarm - critical for battery-powered telemetry nodes. |
| Integrated USB 2.0 Device Controller | Eliminates need for external transceiver; supports CDC ACM and HID classes out-of-box with StellarisWare® drivers. |
| μDMA with 32 Channels | Offloads CPU during high-bandwidth transfers (e.g., ADC streaming to SRAM or UART TX buffering), reducing jitter and ISR overhead. |
| Dual UART with IrDA & FIFO | Supports legacy serial diagnostics (UART0) and isolated RS-485 communication (UART1) with 16-byte FIFOs and automatic half-duplex direction control. |
| Programmable Clock Gating | Per-peripheral clock enable/disable via RCGC registers - simplifies power optimization without external PMIC coordination. |
Applications
| Industrial Motor Control | USB Human Interface Device |
|---|---|
Use Scenario: Closed-loop BLDC motor control in HVAC blowers or conveyor drives requiring precise timing, analog sensing, and fault-safe shutdown. IC Role / Device Role / Timing Role: Real-time execution host for FOC algorithm, ADC sampling trigger, PWM waveform generation, and overcurrent interrupt handler. Use Value: Integrated PWM with dead-time control and synchronized ADC sampling eliminates external timing ICs and reduces BOM count by ≥3 components. | Use Scenario: Programmable industrial keypad or diagnostic tool connecting to PC via USB for configuration and firmware update. IC Role / Device Role / Timing Role: USB device controller with HID report descriptor handling and local button/LED interface management. Use Value: On-chip USB PHY and StellarisWare® HID stack reduce development time to <2 weeks versus custom USB firmware on generic MCUs. |
| Remote Sensor Node | Factory Floor PLC I/O Module |
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and vibration in unattended locations for >1 year. IC Role / Device Role / Timing Role: Low-power supervisor managing sensor polling, data aggregation, RTC timestamping, and USB/UART wakeup-triggered transmission. Use Value: Hibernation current ≤5 µA with RTC active extends CR2032 battery life to 18+ months at 1-minute wake intervals. | Use Scenario: DIN-rail mounted digital I/O expansion module interfacing with main PLC via RS-485 and providing local analog input conditioning. IC Role / Device Role / Timing Role: Isolated signal conditioner with 12-bit ADC, opto-isolated GPIO, and UART-to-RS-485 translation. Use Value: Dual UART with hardware flow control and configurable parity enables robust Modbus RTU communication in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Tiva C TM4C123GH6PM | Successor part with same pinout, 80 MHz Cortex-M4F core, floating-point unit, enhanced USB OTG, and larger flash (256 KB → 512 KB). | Requires updated StellarisWare® → TivaWare™ migration; supports DSP-intensive algorithms and USB host capability. | Select when upgrading legacy LM3S designs needing higher performance, FPU, or USB host functionality - not drop-in compatible due to register map changes. |
| STM32F103VET6 | ARM Cortex-M3 at 72 MHz, 512 KB flash, 64 KB SRAM, but no native USB device controller (requires external PHY) and no hibernation module. | Lacks integrated USB and ultra-low-power hibernation - necessitates external components for USB connectivity and higher sleep current (~15 µA). | Select when prioritizing ecosystem breadth (STM32CubeMX, HAL) and cost sensitivity over integrated USB and sub-5 µA hibernation. |
Compared with TM4C123GH6PM and STM32F103VET6, the LM3S3749-IQC50-A0T provides verified USB device + hibernation integration at 50 MHz - ideal for cost-constrained, battery-aware industrial peripherals where migration effort or external component count must be minimized.
Availability
LM3S3749-IQC50-A0T is available at Aetrix Electronics and suitable for industrial motor control, USB human interface devices, remote sensor nodes, and factory floor PLC I/O modules requiring stable component supply and long-term obsolescence planning.
Supply support for LM3S3749-IQC50-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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and wireless technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S family was designed specifically for cost-sensitive, real-time industrial and automation applications requiring integrated analog, USB, and ultra-low-power hibernation - bridging the gap between 8-bit microcontrollers and high-end application processors.
FAQ
What is the maximum operating frequency of the LM3S3749-IQC50-A0T?
The LM3S3749-IQC50-A0T operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This frequency is specified under industrial temperature conditions (–40°C to +85°C) and 3.3 V supply, and is fully supported by the ARM Cortex-M3 core, all on-chip peripherals, and StellarisWare® driver library timing requirements.
Does the LM3S3749-IQC50-A0T support USB host functionality?
No, the LM3S3749-IQC50-A0T integrates a USB 2.0 full-speed device-only controller. It does not support USB host or OTG modes. For host capability, TI recommends migrating to the Tiva C TM4C123GH6PM, which includes a USB OTG controller with dual-role support and updated TivaWare™ software stack.
What is the hibernation current consumption of the LM3S3749-IQC50-A0T?
The LM3S3749-IQC50-A0T achieves ≤5 µA hibernation current with the real-time clock (RTC) running and battery-backed RAM retained. This value is measured per TI SPMS086H datasheet Section 6.3.6 and assumes proper configuration of the hibernation module, VBAT supply, and disabled non-essential clocks - critical for multi-year battery operation in remote sensors.
Is the LM3S3749-IQC50-A0T pin-compatible with other Stellaris LM3S devices?
The LM3S3749-IQC50-A0T uses a 100-pin LQFP package shared with several LM3S derivatives (e.g., LM3S3634, LM3S3748), but pin functions differ across variants. While physical footprint matches, signal mapping - especially for USB, ADC, and PWM - is not identical. Always verify pinout against SPMS086H Table 4-1 before board reuse.
Which development tools support the LM3S3749-IQC50-A0T?
The LM3S3749-IQC50-A0T is supported by TI's Code Composer Studio™ v6+ with StellarisWare® peripheral driver library, Keil MDK-ARM v4.7+, and IAR Embedded Workbench for ARM v7.1+. Debugging requires JTAG/SWD via TI XDS100v3 or Segger J-Link; evaluation boards include the EK-LM3S3749 and DK-LM3S9B92.
LM3S3749-IQC50-A0T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 3000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, IrDA, Microwire, QEI, SPI, SSI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 61
- Program Memory Size:
- 128KB (128K 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:
LM3S3749-IQC50-A0T FAQ
1.How can I place an order for LM3S3749-IQC50-A0T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S3749-IQC50-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 LM3S3749-IQC50-A0T reliable?
The price and inventory of LM3S3749-IQC50-A0T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S3749-IQC50-A0T is usually 5 days.
3.What payment methods are accepted for LM3S3749-IQC50-A0T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S3749-IQC50-A0T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S3749-IQC50-A0T?
LM3S3749-IQC50-A0T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S3749-IQC50-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 LM3S3749-IQC50-A0T?
For technical support, including LM3S3749-IQC50-A0T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S3749-IQC50-A0T requirements.
6.How does Aetrix verify that LM3S3749-IQC50-A0T is sourced from the original manufacturer or authorized distributors?
All LM3S3749-IQC50-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 LM3S3749-IQC50-A0T meets industry standards.
7.What is the process for return or replacement of LM3S3749-IQC50-A0T?
All LM3S3749-IQC50-A0T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S3749-IQC50-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 LM3S3749-IQC50-A0T part is unused and in its original packaging.
Return procedure for LM3S3749-IQC50-A0T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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