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Texas Instruments LM3S1751-IQC50-A2T
- Part No.:
- LM3S1751-IQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1751-IQC50-A2T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,257
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Product details
Overview
LM3S1751-IQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated hibernation module, 8-channel 12-bit ADC, and dual UARTs. It operates at 50 MHz, supports 1.8–3.6 V supply, and targets low-power industrial control and sensor interface applications.
For engineers reviewing the LM3S1751-IQC50-A2T datasheet, LM3S1751-IQC50-A2T pinout, LM3S1751-IQC50-A2T application, or LM3S1751-IQC50-A2T equivalent, key selection criteria include hibernation-capable real-time clock support, on-chip voltage regulator, JTAG/SWD debug interface, and peripheral set optimized for deterministic motor control and battery-backed operation.
Technical Context
The LM3S1751-IQC50-A2T implements the ARMv7-M architecture with NVIC, SysTick, and MPU, enabling deterministic interrupt latency and memory protection in embedded systems. It integrates a hibernation module with RTC, battery-backed RAM, and wake-up sources including external pins and RTC match events.
Its analog subsystem includes an 8-channel 12-bit ADC with hardware averaging and internal temperature sensor, while serial interfaces comprise two UARTs (one with IrDA SIR), one SSI, and one I²C master/slave controller - all clocked from a programmable PLL-based system clock tree.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3 @ 50 MHz - delivers deterministic 1.25 DMIPS/MHz performance with Thumb-2 instruction set and hardware divide. |
| Memory | 256 KB flash + 32 KB SRAM - sufficient for standalone firmware with bootloader, RTOS, and data logging buffers. |
| ADC | 8-channel 12-bit SAR ADC with 1 MSPS sample rate and hardware averaging - enables precision analog sensing without external signal conditioning. |
| Hibernation Module | RTC + 2 KB battery-backed SRAM + wake-on-RTC-match/external-pin - supports sub-μA sleep current for battery-powered edge nodes. |
| Supply Range | 1.8 V to 3.6 V - compatible with single-cell Li-ion, 3.3 V logic rails, and energy-harvesting power supplies. |
| Debug Interface | JTAG + SWD - allows full-speed debugging, flash programming, and real-time trace via standard TI XDS100v3 or CMSIS-DAP tools. |
| Package | 100-pin LQFP (14 × 14 mm) - provides 70 GPIOs with configurable pull-up/down, slew rate, and drive strength for mixed-signal PCB layout. |
Pinout & Package
LM3S1751-IQC50-A2T is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow TI's standardized Stellaris LM3S1751 pinout, supporting multiplexed peripherals across GPIO banks A–G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply input | Connects to regulated 1.8–3.6 V rail; decoupling required per TI layout guidelines (100 nF + 10 μF near each VDD pin). |
| GND | Ground reference | System ground plane connection; multiple GND pins ensure low-impedance return paths for analog/digital domains. |
| PD0/U0RX | UART0 receive input | Configurable as GPIO or UART0 RX; supports TTL-level serial communication with programmable baud rate generator. |
| PD1/U0TX | UART0 transmit output | Drives UART0 TX signal; open-drain capable when configured as GPIO with OD enable. |
| PC6/I2C0SCL | I²C clock line | Open-drain output with internal pull-up option; supports standard (100 kHz) and fast (400 kHz) I²C modes. |
| PC7/I2C0SDA | I²C data line | Bi-directional open-drain I²C bus line; auto-direction control during master/slave transactions. |
| PH0/SSI0CLK | SSI0 clock output | Master-mode clock output for SPI-compatible peripherals; polarity and phase configurable per frame format. |
| PH1/SSI0FSS | SSI0 frame select | Active-low chip select for slave device synchronization; supports multi-slave configurations with independent FSS lines. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation with RTC | Enables <1.5 μA deep-sleep current with timekeeping and wake-on-event - critical for battery life in remote sensors. |
| On-chip voltage regulator | Internal LDO generates 1.25 V core voltage from main VDD - eliminates need for external core regulator and simplifies BOM. |
| Dual UART with IrDA SIR | Second UART supports infrared serial (SIR) encoding per IrDA 1.4 spec - enables contactless configuration and diagnostics. |
| Hardware ADC averaging | Up to 64-sample hardware averaging reduces noise without CPU overhead - improves effective resolution in noisy industrial environments. |
| GPIO commit registers | Write-once configuration lock prevents accidental reconfiguration during runtime - enhances reliability in safety-critical control loops. |
Applications
| Industrial Sensor Node | Motor Control Interface |
|---|---|
Use Scenario: Remote temperature/humidity monitoring node powered by coin cell with 10-year battery life requirement. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, RTC-triggered wake-up, data preprocessing, and UART transmission to gateway. Use Value: Hibernation module achieves <1.5 μA sleep current; internal LDO and battery-backed RAM eliminate external regulators and backup capacitors. | Use Scenario: Brushless DC motor driver board requiring precise PWM timing, fault detection, and serial command interface. IC Role / Device Role / Timing Role: Real-time motion controller executing commutation logic, reading hall-effect sensors via GPIO, and generating synchronized PWM outputs. Use Value: Deterministic Cortex-M3 interrupt latency (<12 cycles) ensures sub-microsecond timing accuracy; dual PWM timers support complementary dead-time insertion. |
| Smart Building Controller | Asset Tracking Module |
Use Scenario: HVAC zone controller interfacing with thermostats, relays, and building management network via RS-485 (UART-driven). IC Role / Device Role / Timing Role: System-on-chip handling analog sensor inputs, relay actuation, and protocol translation between Modbus RTU and local peripherals. Use Value: Integrated 8-channel ADC and 70 GPIOs reduce external component count; UART0/1 support half-duplex RS-485 with automatic direction control. | Use Scenario: GPS-enabled logistics tag reporting location every 6 hours using cellular modem and accelerometer wake-up. IC Role / Device Role / Timing Role: Low-power host MCU managing GPS fix acquisition, motion-triggered wake-up via analog comparator, and modem control sequencing. Use Value: Analog comparator with internal reference detects motion thresholds without external op-amps; hibernation RTC schedules periodic GPS sessions autonomously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S1968-IQC50-A2T | Same package and core, but adds Ethernet MAC and 64 KB SRAM - no hibernation module. | Better suited for wired networked devices; lacks RTC/battery-backup capability required for ultra-low-power sleep. | Select LM3S1751-IQC50-A2T when hibernation, RTC, and sub-μA sleep current are mandatory. |
| TM4C123GH6PM | Newer generation Cortex-M4F with FPU, 256 KB flash, 32 KB SRAM, and enhanced hibernation - pin-compatible but requires PCB revision due to different pin mapping. | Supports floating-point math for sensor fusion; retains hibernation features but adds USB and CAN. | Choose TM4C123GH6PM for new designs needing higher compute throughput or USB connectivity; LM3S1751-IQC50-A2T remains optimal for legacy-compatible, cost-sensitive hibernation use cases. |
Compared with LM3S1968-IQC50-A2T and TM4C123GH6PM, the LM3S1751-IQC50-A2T uniquely balances hibernation-optimized power efficiency, integrated RTC, and mature toolchain support - making it the preferred choice for battery-constrained industrial nodes where deterministic low-power operation outweighs raw compute or peripheral expansion needs.
Availability
LM3S1751-IQC50-A2T is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, smart building controllers, and asset tracking modules requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1751-IQC50-A2T 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 embedded applications requiring real-time control, integrated analog peripherals, and robust hibernation - targeting industrial automation, building controls, and portable instrumentation.
FAQ
What is the maximum operating frequency of the LM3S1751-IQC50-A2T?
The LM3S1751-IQC50-A2T operates at a maximum system clock frequency of 50 MHz, achieved via its internal PLL that multiplies the crystal or external clock source. This frequency is specified under full industrial temperature range (–40°C to +85°C) and 1.8–3.6 V supply conditions, and is validated in the production datasheet SPMS029I.
Does the LM3S1751-IQC50-A2T include an internal voltage regulator?
Yes, the LM3S1751-IQC50-A2T integrates an internal LDO regulator that generates the 1.25 V core voltage from the main VDD supply (1.8–3.6 V). This eliminates the need for an external core regulator and simplifies power design, as confirmed in Section 5.2.3 "Power Control" of the SPMS029I datasheet.
What debug interfaces does the LM3S1751-IQC50-A2T support?
The LM3S1751-IQC50-A2T supports both JTAG and Serial Wire Debug (SWD) interfaces, enabling full-featured programming, real-time debugging, and trace capabilities. These interfaces are electrically compatible with TI XDS100v3-class emulators and CMSIS-DAP-compliant debug probes, as documented in Section 4 "JTAG Interface" of the SPMS029I datasheet.
How much battery-backed memory does the LM3S1751-IQC50-A2T provide in hibernation mode?
The LM3S1751-IQC50-A2T provides 2 KB of battery-backed SRAM accessible during hibernation mode, retained via VBAT supply. This memory preserves critical state variables, calibration data, or timestamps across deep-sleep cycles, as defined in Section 6.3.5 "Battery-Backed Memory" of the SPMS029I datasheet.
Is the LM3S1751-IQC50-A2T pin-compatible with other Stellaris LM3S devices?
No, the LM3S1751-IQC50-A2T is not universally pin-compatible across the LM3S family. While it shares the 100-pin LQFP package with several variants (e.g., LM3S1968), pin functions differ significantly - especially for hibernation-related signals (HIB, RTCCLK), analog inputs, and peripheral mappings. Always verify pinout against the specific SPMS029I datasheet for LM3S1751-IQC50-A2T.
LM3S1751-IQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1751-IQC50-A2T FAQ
1.How can I place an order for LM3S1751-IQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1751-IQC50-A2T 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-A2T reliable?
The price and inventory of LM3S1751-IQC50-A2T 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-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1751-IQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1751-IQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1751-IQC50-A2T?
LM3S1751-IQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1751-IQC50-A2T 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-A2T?
For technical support, including LM3S1751-IQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1751-IQC50-A2T requirements.
6.How does Aetrix verify that LM3S1751-IQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1751-IQC50-A2T 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-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1751-IQC50-A2T?
All LM3S1751-IQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1751-IQC50-A2T, 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-A2T part is unused and in its original packaging.
Return procedure for LM3S1751-IQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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