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Texas Instruments LM3S5749-IQC50-A0T
- Part No.:
- LM3S5749-IQC50-A0T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S5749-IQC50-A0T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
LM3S5749-IQC50-A0T from Texas Instruments is an ARM Cortex-M3-based microcontroller with 256 KB flash, 64 KB SRAM, integrated 12-bit ADC (1 MSPS), dual UARTs, SSI, I²C, and hibernation module for ultra-low-power operation. It operates at 50 MHz and supports real-time motor control and industrial sensing applications.
For engineers reviewing the LM3S5749-IQC50-A0T datasheet, LM3S5749-IQC50-A0T pinout, LM3S5749-IQC50-A0T application, or LM3S5749-IQC50-A0T equivalent, key selection criteria include its hibernation-optimized power management, on-chip ROM bootloader, NVIC-integrated interrupt handling, and support for deterministic real-time execution in resource-constrained embedded systems.
Technical Context
The LM3S5749-IQC50-A0T implements a 32-bit ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and memory protection unit (MPU). It integrates a hibernation module with battery-backed RTC and SRAM, enabling sub-µA sleep current and fast wake-up from deep sleep in under 1.5 µs.
Its analog subsystem includes a 12-bit, 1-MSPS ADC with eight sample sequencers and hardware averaging, while serial peripherals comprise two UARTs (one with IrDA/SIR), two SSI modules, and one I²C interface-all DMA-capable via the μDMA controller with 32-channel arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic real-time task scheduling and interrupt latency under 12 cycles. |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface - supports in-application programming (IAP) and secure firmware updates without external memory. |
| SRAM | 64 KB general-purpose SRAM with parity - provides reliable data storage for critical variables and stack during active and hibernate modes. |
| ADC | 12-bit, 1 MSPS, 8-channel, with hardware averaging and temperature sensor - delivers high-fidelity analog acquisition for motor current sensing or environmental monitoring. |
| Hibernate Current | 1.7 µA typical with RTC and 2 KB RAM retained - enables multi-year battery life in remote sensor nodes and metering applications. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard PCB assembly processes and offers full peripheral pin access including GPIO, UART, SSI, and ADC inputs. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and building control systems. |
Pinout & Package
LM3S5749-IQC50-A0T is housed in a 100-pin LQFP package (JEDEC MO-220, variant VGG). Pinout is fully documented in TI SPMS094H datasheet Section 9 (GPIO) and Section 5 (System Control), with dedicated pins for JTAG debug, hibernate control (HIB), RTC battery input (VBAT), and multiple peripheral multiplexing groups.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply rails | Separate digital (VDD), analog (VDDA), and core (VDDC) supplies enable noise isolation and precise ADC reference stability. |
| HIB, VBAT, RTCOSC | Hibernation module interface | Enables autonomous RTC operation and 2 KB SRAM retention during deep sleep using external coin-cell backup. |
| PA0–PA7, PB0–PB7, etc. | General-purpose I/O | Configurable as GPIO, UART, SSI, I²C, or timer outputs with slew-rate control and weak pull-ups/downs. |
| JTAG_TCK, TMS, TDI, TDO | Debug interface | Supports full SWD/JTAG debugging and in-circuit programming without requiring external debug probes beyond standard TI tools. |
| U0RX, U0TX, U1RX, U1TX | UART transceivers | Dual UARTs with FIFOs and IrDA modulation capability - one supports SIR physical layer for infrared communication. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module | Reduces system standby power to 1.7 µA while retaining RTC time and 2 KB SRAM - eliminates need for external low-power controllers in battery-operated devices. |
| ROM Bootloader | Factory-programmed boot code enables UART/SSI-based firmware updates without external programmer - simplifies field upgrades and reduces BOM cost. |
| μDMA Controller | 32-channel, scatter-gather capable DMA offloads CPU from peripheral data movement - improves real-time responsiveness and reduces CPU load in high-throughput UART/ADC applications. |
| NVIC with 64 interrupts | Hardware-prioritized, low-latency interrupt handling with tail-chaining - ensures sub-12-cycle response to time-critical events like PWM fault detection or ADC conversion completion. |
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy - enables thermal monitoring of MCU die without external components, supporting fan control or overtemperature shutdown logic. |
Applications
| Industrial Motor Control | Smart Energy Metering |
|---|---|
Use Scenario: Closed-loop BLDC motor drive with current sensing, commutation timing, and fault reporting over RS-485. IC Role / Device Role / Timing Role: Real-time controller executing FOC algorithm, managing PWM generation, ADC sampling, and UART-based telemetry. Use Value: Deterministic 50 MHz Cortex-M3 execution, hardware-accelerated μDMA transfers, and <1.5 µs wake-from-hibernate ensure precise timing for 20 kHz PWM switching and rapid fault response. | Use Scenario: Battery-powered electricity meter with tamper detection, kWh accumulation, and wireless data upload during periodic wake cycles. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC, RTC calendar, secure flash logging, and low-power RF interface control. Use Value: 1.7 µA hibernate current with RTC and 2 KB RAM retention enables >10-year battery life; integrated ROM bootloader supports secure OTA firmware patches. |
| Building Automation Sensor Node | Medical Portable Monitor |
Use Scenario: Wireless HVAC sensor node measuring temperature, humidity, and CO₂, transmitting data every 5 minutes via Zigbee or BLE companion IC. IC Role / Device Role / Timing Role: Low-power host processor acquiring analog sensor data, managing sleep/wake cycles, and interfacing with external radio. Use Value: Hibernation module with external wake sources (GPIO, RTC match) minimizes average current; dual UARTs simplify connection to sensor bridges and radios. | Use Scenario: Handheld patient monitor capturing ECG, SpO₂, and temperature, storing trend data locally and uploading via USB or Bluetooth. IC Role / Device Role / Timing Role: Primary controller handling analog front-end digitization, real-time waveform processing, and human-interface management. Use Value: 12-bit, 1-MSPS ADC with hardware averaging delivers clinical-grade signal fidelity; 64 KB SRAM supports multi-second waveform buffering without external memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TM4C123GH6PM | Successor part with same pinout, 80 MHz Cortex-M4F core, FPU, enhanced ADC (3 MSPS), and larger flash (256 KB → 512 KB) | Requires updated toolchain and firmware; supports floating-point math and higher-speed control loops | Recommended for new designs needing higher performance or FPU; LM3S5749-IQC50-A0T remains viable for cost-sensitive legacy-compatible deployments. |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB SRAM, no hibernation module, different peripheral set (USB, CAN) | Lacks ultra-low-power hibernate mode; requires external RTC/battery for long-term timekeeping | Preferred where USB host/device or CAN bus is required; LM3S5749-IQC50-A0T better suits battery-life-critical applications with RTC dependency. |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S5749-IQC50-A0T uniquely balances industrial-grade temperature range, sub-2 µA hibernate current with RTC retention, and mature StellarisWare software support - making it optimal for long-lifecycle, battery-constrained embedded control where upgrade path flexibility is secondary to proven reliability.
Availability
LM3S5749-IQC50-A0T is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, building automation sensor nodes, and portable medical monitors requiring stable component supply and long-term availability assurance.
Supply support for LM3S5749-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial, automotive, and consumer electronics.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded control applications demanding low power, rich analog integration, and robust industrial qualification - positioning LM3S5749-IQC50-A0T as a foundational MCU for deterministic, battery-aware systems.
FAQ
What is the maximum operating frequency of the LM3S5749-IQC50-A0T?
The LM3S5749-IQC50-A0T operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This speed is guaranteed across the full industrial temperature range (–40°C to +85°C) and supports real-time execution of control algorithms, ADC sampling at 1 MSPS, and UART communication up to 3 Mbps. The LM3S5749-IQC50-A0T achieves this performance while maintaining low dynamic power consumption through its optimized Cortex-M3 implementation and clock gating architecture.
Does the LM3S5749-IQC50-A0T support in-system programming (ISP)?
Yes, the LM3S5749-IQC50-A0T supports in-system programming via its factory-programmed ROM bootloader, accessible through UART or SSI interfaces. This allows firmware updates without external debug hardware - ideal for field-deployed devices. The LM3S5749-IQC50-A0T bootloader validates image integrity before execution and supports encrypted firmware loading when used with TI's StellarisWare security libraries, ensuring secure and reliable ISP operations throughout the product lifecycle.
What is the hibernate current specification for the LM3S5749-IQC50-A0T?
The LM3S5749-IQC50-A0T achieves a typical hibernate current of 1.7 µA when configured with RTC enabled and 2 KB of SRAM retained, as measured per TI SPMS094H datasheet Section 6.3.6. This ultra-low power state is sustained using an external VBAT supply (e.g., coin cell), and wake-up occurs in under 1.5 µs upon RTC alarm or GPIO event. The LM3S5749-IQC50-A0T's hibernation module eliminates the need for external real-time clocks or backup controllers in battery-powered applications.
How many UART interfaces does the LM3S5749-IQC50-A0T include, and what special features do they offer?
The LM3S5749-IQC50-A0T integrates two independent UART modules: UART0 and UART1. UART0 supports IrDA physical layer (SIR) modulation for infrared communication, while both UARTs feature 16-byte FIFOs, programmable baud rates, and hardware flow control. Each UART can be driven by the μDMA controller, enabling zero-CPU-overhead data transfer. These capabilities make the LM3S5749-IQC50-A0T well-suited for industrial telemetry, sensor bridging, and legacy protocol gateways.
Is the LM3S5749-IQC50-A0T pin-compatible with other Stellaris LM3S devices?
The LM3S5749-IQC50-A0T uses a 100-pin LQFP package shared with several other LM3S devices (e.g., LM3S5732, LM3S5739), but pin compatibility is not guaranteed across all variants due to differences in peripheral mapping and GPIO multiplexing. While the physical footprint matches, signal assignments for UART, SSI, and ADC vary between models. Engineers must verify pin functions against the specific LM3S5749-IQC50-A0T datasheet - especially Sections 5 and 9 - rather than assuming drop-in replacement with other LM3S parts.
LM3S5749-IQC50-A0T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 5000
- 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:
- CANbus, 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:
LM3S5749-IQC50-A0T FAQ
1.How can I place an order for LM3S5749-IQC50-A0T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S5749-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 LM3S5749-IQC50-A0T reliable?
The price and inventory of LM3S5749-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 LM3S5749-IQC50-A0T is usually 5 days.
3.What payment methods are accepted for LM3S5749-IQC50-A0T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S5749-IQC50-A0T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S5749-IQC50-A0T?
LM3S5749-IQC50-A0T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S5749-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 LM3S5749-IQC50-A0T?
For technical support, including LM3S5749-IQC50-A0T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S5749-IQC50-A0T requirements.
6.How does Aetrix verify that LM3S5749-IQC50-A0T is sourced from the original manufacturer or authorized distributors?
All LM3S5749-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 LM3S5749-IQC50-A0T meets industry standards.
7.What is the process for return or replacement of LM3S5749-IQC50-A0T?
All LM3S5749-IQC50-A0T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S5749-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 LM3S5749-IQC50-A0T part is unused and in its original packaging.
Return procedure for LM3S5749-IQC50-A0T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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