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Texas Instruments LM3S5749-IQC50-A0
- Part No.:
- LM3S5749-IQC50-A0
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S5749-IQC50-A0.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S5749-IQC50-A0 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated 12-bit ADC (1 MSPS), dual UARTs, SSI, I²C, PWM timers, and hibernation module - deployed in industrial motor control, sensor nodes, and embedded HMI systems.
For engineers reviewing the LM3S5749-IQC50-A0 datasheet, LM3S5749-IQC50-A0 pinout, LM3S5749-IQC50-A0 application, or LM3S5749-IQC50-A0 equivalent, key selection criteria include Cortex-M3 core performance at 50 MHz, hibernation current of 1.8 µA, 12-channel ADC resolution, UART/SSI/I²C peripheral integration, and QFP-100 package compatibility with industrial temperature range operation.
Technical Context
The LM3S5749-IQC50-A0 implements the ARM Cortex-M3 processor core with Thumb-2 instruction set, NVIC interrupt controller, SysTick timer, and MPU - enabling deterministic real-time execution and memory protection in resource-constrained embedded systems. It integrates a dedicated hibernation module with RTC, battery-backed RAM, and wake-up capability from deep-sleep states.
Peripherals include two UARTs supporting IrDA/SIR, one SSI port for SPI/Microwire communication, one I²C master/slave interface, eight 16/32-bit general-purpose timers (with PWM and RTC modes), and a 12-bit, 1-MSPS ADC with four independent sample sequencers and hardware averaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic interrupt latency and efficient C/C++ code execution. |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface - supports in-system programming and secure firmware updates. |
| SRAM | 64 KB on-chip SRAM with parity checking - provides fast, reliable data storage for real-time variables and stack operations. |
| ADC | 12-bit, 1-MSPS SAR ADC with 12 input channels and four sample sequencers - enables concurrent analog monitoring across multiple sensors. |
| Hibernation Current | 1.8 µA typical with RTC active - extends battery life in always-on sensor or metering applications without external power management ICs. |
| Operating Temp | –40°C to +85°C industrial grade - ensures stable operation in factory automation, HVAC, and outdoor embedded equipment. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard PCB assembly processes and thermal management for moderate-power MCU applications. |
Pinout & Package
LM3S5749-IQC50-A0 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C). Pinout conforms to TI's LM3S5749 family layout, with dedicated JTAG debug, GPIO banks A–G, analog inputs, and peripheral function multiplexing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital (VDD), analog (VDDA), and core (VDDC) rails - enable noise isolation between logic, ADC, and CPU domains. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog (GNDA) and core (GNDC) grounds - reduce coupling noise into sensitive ADC and PLL circuits. |
| PD0–PD7, PE0–PE5, PF0–PF4, PG0–PG7 | GPIO pins | Multi-function I/O with programmable drive strength, slew rate, and pull-up/down - support direct LED driving, button sensing, and peripheral control without external components. |
| PA0–PA7, PB0–PB7 | UART0/1, SSI0, I²C0 signals | Shared peripheral functions mapped to GPIO pins - allow flexible board layout and signal routing via software configuration. |
| PC0–PC7 | ADC0 inputs (AIN0–AIN7) | Analog input channels with internal reference and temperature sensor - enable direct connection of thermistors, potentiometers, and voltage dividers. |
| TCK, TMS, TDI, TDO, nTRST | JTAG debug interface | Standard 5-pin JTAG for full-speed debugging, flash programming, and boundary scan - eliminates need for separate SWD or proprietary debug adapters. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module | Retains RTC time, 2 KB battery-backed SRAM, and wake-up on external event or timer - enables years-long operation on coin-cell batteries in remote monitoring devices. |
| μDMA Controller | 32-channel micro-DMA with scatter-gather support - offloads CPU during high-bandwidth transfers (e.g., ADC-to-memory, UART-to-buffer), reducing ISR overhead and jitter. |
| Peripheral Integration | Two UARTs (one with IrDA), one SSI, one I²C, eight GPTMs, WDT, and system control peripherals - minimizes external component count in compact industrial controllers. |
| Memory Protection Unit (MPU) | Configurable region-based memory access control - enforces privilege separation between firmware modules and prevents accidental overwrites in safety-critical tasks. |
| ROM Bootloader | Factory-programmed ROM bootloader supporting UART, SSI, and I²C firmware updates - enables field upgrades without JTAG hardware or pre-flashed application code. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed and position control of BLDC motors in HVAC blowers and conveyor drives using Hall-effect feedback and PWM outputs. IC Role / Device Role / Timing Role: Real-time execution host for FOC algorithms, ADC sampling synchronization, and precise 100 ns PWM edge placement. Use Value: Integrated 50 MHz Cortex-M3 core and eight GPTMs eliminate need for external timing ICs or FPGA glue logic in cost-sensitive motor drives. | Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and CO₂ via analog and I²C sensors, transmitting data hourly via UART-to-LoRa module. IC Role / Device Role / Timing Role: Low-power system manager coordinating sensor reads, data logging, RTC-triggered wake-up, and serial transmission bursts. Use Value: 1.8 µA hibernation current and integrated RTC extend 2000 mAh coin-cell life beyond 3 years without external power gating circuitry. |
| Embedded Human-Machine Interface | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Touch-enabled front panel for industrial equipment with LCD driver interface, button matrix scanning, and status LED control. IC Role / Device Role / Timing Role: Primary UI controller managing display refresh, capacitive touch polling, and real-time alarm response with <10 ms latency. Use Value: 64 KB SRAM buffers frame data and touch history; GPIO flexibility allows direct connection to resistive/capacitive overlays without companion ASICs. | Use Scenario: DIN-rail mounted I/O expansion module converting 24 V DC field signals to Modbus RTU over RS-485, with isolated digital inputs and relay outputs. IC Role / Device Role / Timing Role: Protocol engine and isolation interface coordinator handling Modbus framing, CRC calculation, and opto-isolated GPIO state management. Use Value: Dual UARTs support simultaneous RS-232 debug and RS-485 Modbus communication; GPIOs tolerate 5 V tolerant inputs for direct 24 V signal conditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S811-IQC50-A0 | Same Cortex-M3 core, 64 KB flash, 25 KB SRAM, no hibernation module, no μDMA, fewer peripherals (1 UART, 1 SSI, no I²C). | Suitable for simpler control tasks without low-power sleep or multi-peripheral concurrency requirements. | Select when BOM cost reduction is critical and hibernation, DMA, or dual UARTs are unnecessary. |
| TM4C123GH6PM | Successor generation: 80 MHz Cortex-M4F core, 256 KB flash, 32 KB SRAM, FPU, enhanced ADC (12-bit, 1 MSPS, 16 ch), same 100-pin LQFP package. | Required for floating-point math (e.g., FFT-based vibration analysis), higher throughput, or extended lifecycle availability beyond LM3S end-of-life. | Choose for new designs needing FPU, longer product support, or improved analog performance - not drop-in compatible due to register map differences. |
Compared with LM3S811-IQC50-A0, the LM3S5749-IQC50-A0 delivers 4× more flash, full μDMA, hibernation, and richer peripheral set - justifying its use in feature-complete industrial endpoints. Versus TM4C123GH6PM, it trades FPU and higher clock for proven stability and legacy toolchain compatibility in maintenance-focused deployments.
Availability
LM3S5749-IQC50-A0 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, embedded HMI, and PLC I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for LM3S5749-IQC50-A0 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as the first ARM Cortex-M3-based MCU family for cost-sensitive, real-time industrial control - emphasizing integrated peripherals, low-power hibernation, and seamless migration from 8/16-bit architectures.
FAQ
What is the maximum operating frequency of the LM3S5749-IQC50-A0?
The LM3S5749-IQC50-A0 operates at a maximum system clock frequency of 50 MHz, derived from an internal precision oscillator or external crystal source. This frequency is fully supported across all on-chip peripherals including the ADC, UARTs, and timers. The Cortex-M3 core executes instructions at this rate with single-cycle multiplication and deterministic interrupt latency - making the LM3S5749-IQC50-A0 suitable for time-critical control loops in motor and sensor applications.
Does the LM3S5749-IQC50-A0 support in-application programming (IAP) of flash memory?
Yes, the LM3S5749-IQC50-A0 supports in-application programming via its on-chip flash controller, allowing firmware updates without halting CPU execution. The flash memory is organized into 1 KB sectors with individual lock bits, enabling secure sector protection during runtime. Applications can reprogram non-active sectors while executing from others - a capability used in bootloader implementations and field-upgradable industrial firmware. The LM3S5749-IQC50-A0 datasheet specifies timing and sequence requirements for safe flash writes and erases.
What are the power supply requirements for the LM3S5749-IQC50-A0?
The LM3S5749-IQC50-A0 requires three independent supply connections: VDD (digital I/O, 3.3 V ±10%), VDDA (analog, 3.3 V ±10%), and VDDC (core, 2.5 V ±10%). Separate ground returns (GND, GNDA, GNDC) are mandatory to maintain ADC accuracy and PLL stability. The device draws 28 mA typical at 50 MHz active mode and drops to 1.8 µA in hibernate mode with RTC enabled - confirming its suitability for battery-operated and energy-conscious designs.
How many ADC channels does the LM3S5749-IQC50-A0 support, and what is their resolution?
The LM3S5749-IQC50-A0 integrates a 12-bit successive approximation register (SAR) ADC with up to 12 external input channels (AIN0–AIN11) and one internal temperature sensor. It achieves 1 million samples per second (1 MSPS) aggregate throughput using four independent sample sequencers that support hardware averaging, trigger synchronization, and burst sampling. This ADC architecture enables simultaneous monitoring of multiple analog sensors - such as current shunts, thermistors, and pressure transducers - without external multiplexers or sample-and-hold circuits.
Is the LM3S5749-IQC50-A0 pin-compatible with other LM3S devices in the same package?
No, the LM3S5749-IQC50-A0 is not fully pin-compatible with other LM3S devices in the 100-pin LQFP package. While it shares the same physical footprint and power/ground pin locations, peripheral signal assignments (e.g., UART, SSI, I²C, ADC inputs) differ across the LM3S family. For example, LM3S811 assigns UART0 to different GPIO pins than LM3S5749-IQC50-A0. Board-level reuse requires verification of signal mapping per TI's device-specific pinout tables - not assumed compatibility based on package alone.
LM3S5749-IQC50-A0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 5000
- Packaging:
- Tray
- 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-A0 FAQ
1.How can I place an order for LM3S5749-IQC50-A0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S5749-IQC50-A0 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-A0 reliable?
The price and inventory of LM3S5749-IQC50-A0 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-A0 is usually 5 days.
3.What payment methods are accepted for LM3S5749-IQC50-A0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S5749-IQC50-A0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S5749-IQC50-A0?
LM3S5749-IQC50-A0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S5749-IQC50-A0 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-A0?
For technical support, including LM3S5749-IQC50-A0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S5749-IQC50-A0 requirements.
6.How does Aetrix verify that LM3S5749-IQC50-A0 is sourced from the original manufacturer or authorized distributors?
All LM3S5749-IQC50-A0 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-A0 meets industry standards.
7.What is the process for return or replacement of LM3S5749-IQC50-A0?
All LM3S5749-IQC50-A0 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S5749-IQC50-A0, 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-A0 part is unused and in its original packaging.
Return procedure for LM3S5749-IQC50-A0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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