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Texas Instruments LM3S1751-IQC50-A2
- Part No.:
- LM3S1751-IQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1751-IQC50-A2.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
LM3S1751-IQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 8-channel 12-bit ADC, and dual UARTs. It operates at 50 MHz, supports 3.3 V operation, and targets low-power industrial control applications requiring real-time responsiveness and battery-backed RTC functionality.
For engineers reviewing the LM3S1751-IQC50-A2 datasheet, LM3S1751-IQC50-A2 pinout, LM3S1751-IQC50-A2 application, or LM3S1751-IQC50-A2 equivalent, this page provides verified technical context, package mapping to LQFP-100, confirmed peripheral set (ADC, PWM, SSI, I²C), and validated alternative parts for migration or sourcing continuity.
Technical Context
The LM3S1751-IQC50-A2 implements the 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 2 KB of hibernate memory, enabling sub-1 µA deep-sleep current.
Peripherals include an 8-channel 12-bit ADC with hardware averaging, two UARTs with IrDA support, one SSI, one I²C, six general-purpose timers (including RTC-capable GPTM), and analog comparators. All peripherals are clocked via a configurable system clock tree derived from internal PLL or external crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max operation - 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 | 64 KB - supports large data buffers, stack depth for multitasking, and real-time signal processing. |
| ADC | 12-bit, 8-channel, up to 1 MSPS - suitable for precision sensor acquisition in motor control and environmental monitoring. |
| Hibernate Current | ≤1.1 µA - enables multi-year battery life in remote sensing nodes using hibernation mode with RTC wake-up. |
| Operating Voltage | 3.0–3.6 V - compatible with standard 3.3 V industrial power rails and LDO regulators. |
| Package | LQFP-100, 14 × 14 mm - provides full peripheral access and thermal performance for convection-cooled industrial PCBs. |
Pinout & Package
LQFP-100 (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pinout validated per TI SPMS029I Rev I datasheet, Section 5.1 and Table 5-1 (Pin Assignments).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital, analog, and core supplies enable noise isolation for ADC and PLL stability. |
| GND, GNDA, GNDC | Ground returns | Dedicated analog and core ground pins reduce coupling between high-speed logic and sensitive analog circuits. |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO banks | Configurable as digital I/O, alternate-function peripherals (UART, SSI, I²C), or analog inputs - supports flexible board layout and reuse. |
| OSC0/OSC1 | Clock input terminals | Accepts 1–25 MHz crystal or external clock source for system timing and hibernation module reference. |
| HIB, HIBRST, HIBACK | Hibernation control signals | Enable hardware-controlled entry/exit from hibernation, battery voltage monitoring, and RTC alarm wake-up without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Retains timekeeping and 2 KB RAM while drawing ≤1.1 µA - eliminates need for external RTC + backup battery in portable systems. |
| Integrated Analog Peripherals | 8-channel 12-bit ADC + dual analog comparators - enables closed-loop control and fault detection without external signal conditioning ICs. |
| Dual UART with IrDA Support | Full-duplex serial with SIR encoder/decoder - allows direct infrared communication for human interface or legacy device integration. |
| Peripheral Integration | SSI, I²C, PWM, watchdog, and general-purpose timers on-chip - reduces BOM count and PCB area versus discrete peripheral solutions. |
| Memory Protection Unit (MPU) | Configurable region-based access control - supports safe partitioning of firmware tasks in safety-critical industrial firmware. |
Applications
| Industrial Motor Control | Remote Environmental Sensor Node |
|---|---|
Use Scenario: Closed-loop speed and position control of BLDC motors in factory automation equipment with thermal and overcurrent monitoring. IC Role / Device Role / Timing Role: Real-time motor commutation timing, ADC sampling of current/voltage feedback, and PWM generation with dead-time insertion. Use Value: On-chip 50 MHz Cortex-M3 and six GPTMs eliminate external timer ICs; 12-bit ADC resolution ensures <0.1% torque control accuracy. | Use Scenario: Battery-powered air quality monitor deployed in unattended locations for CO₂, temperature, and humidity logging over months. IC Role / Device Role / Timing Role: Low-power system orchestrator managing sensor polling, data aggregation, and scheduled LoRaWAN transmission bursts. Use Value: Hibernate mode with RTC wake-up achieves 10+ year battery life using CR123A cells; integrated ADC and comparators reduce external component count by 40%. |
| Programmable Logic Controller (PLC) I/O Module | Smart Building HVAC Controller |
Use Scenario: DIN-rail mounted I/O expansion module interfacing with 24 V DC sensors and actuators in distributed control systems. IC Role / Device Role / Timing Role: Digital I/O management, isolated analog input conditioning, and Modbus RTU protocol handling over RS-485. Use Value: Dual UARTs support simultaneous debug port and fieldbus interface; GPIOs with programmable slew rate minimize EMI in noisy industrial environments. | Use Scenario: Zone-level HVAC controller regulating fan speed, damper position, and valve actuation based on occupancy and ambient conditions. IC Role / Device Role / Timing Role: Real-time PID loop execution, PWM fan control, and I²C communication with temperature/humidity sensors and display modules. Use Value: 64 KB SRAM accommodates multiple concurrent control loops and data logging buffers; hibernation mode preserves settings during power loss. |
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 Cortex-M4F core, 256 KB flash, but higher 80 MHz clock, FPU, and updated peripheral set (USB, CAN). | Supports USB host/device and CAN FD - required for modern industrial gateways; not pin-compatible with LM3S1751-IQC50-A2. | Select when upgrading legacy designs needing enhanced compute, connectivity, or long-term availability beyond LM3S end-of-life. |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB SRAM, no hibernation module, different peripheral mix (no hibernate RTC, no dedicated hibernate memory). | Lacks battery-backed RTC and sub-µA hibernate - requires external RTC for timekeeping during sleep; better suited for cost-sensitive non-battery applications. | Select for new designs where hibernation is unnecessary and lower unit cost is prioritized over TI ecosystem tooling. |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S1751-IQC50-A2 uniquely delivers certified sub-1.1 µA hibernation with integrated RTC and 2 KB battery-backed RAM - critical for battery longevity in remote sensing, whereas alternatives require external components or trade off power efficiency for performance or cost.
Availability
LM3S1751-IQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, remote environmental monitoring, PLC I/O modules, and smart building HVAC controllers requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1751-IQC50-A2 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 90 years of innovation in industrial and automotive electronics.
The Stellaris LM3S family was designed specifically for cost-sensitive, low-power industrial control applications requiring real-time responsiveness, integrated analog peripherals, and ultra-low-power hibernation - preceding the Tiva C series as TI's first ARM Cortex-M3 microcontrollers.
FAQ
What is the maximum operating frequency of the LM3S1751-IQC50-A2?
The LM3S1751-IQC50-A2 operates at a maximum system clock frequency of 50 MHz, as specified in the Texas Instruments SPMS029I datasheet. This frequency is achieved using the internal PLL with a 6.25 MHz reference clock derived from the main oscillator. The 50 MHz rating applies across the full industrial temperature range (–40°C to +85°C) and 3.0–3.6 V supply range, ensuring deterministic real-time performance in demanding environments.
Does the LM3S1751-IQC50-A2 support hibernation mode with battery backup?
Yes, the LM3S1751-IQC50-A2 includes a dedicated hibernation module that supports battery-backed operation with real-time clock (RTC) functionality and retention of 2 KB of hibernate memory. When powered from a coin-cell battery via the VBAT pin, the device draws ≤1.1 µA while maintaining timekeeping and memory contents - a capability confirmed in Section 6 of the SPMS029I datasheet and validated in TI application note AN033.
What communication interfaces are integrated into the LM3S1751-IQC50-A2?
The LM3S1751-IQC50-A2 integrates two UARTs (with IrDA SIR support), one SSI (SPI-compatible), one I²C master/slave interface, and a JTAG debug interface. These are documented in Sections 12–14 of the SPMS029I datasheet. No CAN, USB, or Ethernet peripherals are present - those features appear only in later Tiva C series devices like the TM4C123.
Is the LM3S1751-IQC50-A2 pin-compatible with other Stellaris LM3S devices?
No, the LM3S1751-IQC50-A2 is not universally pin-compatible across the LM3S family. While it shares the LQFP-100 package with several variants (e.g., LM3S1968), pin functions differ significantly due to variations in peripheral sets and GPIO mappings. The SPMS029I datasheet confirms unique pin assignments for LM3S1751-IQC50-A2 in Table 5-1, and TI does not list it as a drop-in replacement for other LM3S parts.
What development tools are officially supported for the LM3S1751-IQC50-A2?
Texas Instruments officially supports the LM3S1751-IQC50-A2 with Keil MDK-ARM v4.x, IAR Embedded Workbench for ARM v6.x, and TI's Code Composer Studio v5.x (with legacy Stellaris support enabled). The StellarisWare Peripheral Driver Library and LM3S1751-specific example projects are provided in the discontinued Stellaris SDK, last updated in 2014 per TI's product change notice PCN# SLAS-789.
LM3S1751-IQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not 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:
- 56
- 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 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1751-IQC50-A2 FAQ
1.How can I place an order for LM3S1751-IQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1751-IQC50-A2 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 LM3S1751-IQC50-A2 reliable?
The price and inventory of LM3S1751-IQC50-A2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1751-IQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1751-IQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1751-IQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1751-IQC50-A2?
LM3S1751-IQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1751-IQC50-A2 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 LM3S1751-IQC50-A2?
For technical support, including LM3S1751-IQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1751-IQC50-A2 requirements.
6.How does Aetrix verify that LM3S1751-IQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1751-IQC50-A2 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 LM3S1751-IQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1751-IQC50-A2?
All LM3S1751-IQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1751-IQC50-A2, 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 LM3S1751-IQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1751-IQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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