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Texas Instruments LM3S1751-EQC50-A2T
- Part No.:
- LM3S1751-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1751-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S1751-EQC50-A2T 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, dual UARTs, I²C, SSI, and PWM peripherals. It operates at up to 50 MHz and supports low-power hibernate mode with RTC and battery-backed memory for energy-sensitive embedded control.
For engineers reviewing the LM3S1751-EQC50-A2T datasheet, LM3S1751-EQC50-A2T pinout, LM3S1751-EQC50-A2T application, or LM3S1751-EQC50-A2T equivalent, key selection criteria include hibernation-capable power management, on-chip analog acquisition capability, deterministic real-time interrupt latency, and Cortex-M3 debug infrastructure including SWD/JTAG support.
Technical Context
The LM3S1751-EQC50-A2T implements the ARMv7-M architecture with Thumb-2 instruction set, nested vectored interrupt controller (NVIC) supporting 48 configurable interrupts, and memory protection unit (MPU) for system robustness. It integrates a dedicated hibernation module with RTC, battery-backed RAM, and wake-up sources including external pins and RTC match events.
Peripherals include two UARTs with IrDA/SIR support, one I²C master/slave interface, one SSI port, eight 16-bit general-purpose timers (with RTC and PWM modes), and an 8-channel 12-bit ADC with hardware averaging and temperature sensor. All peripherals are clock-gated and accessible via APB bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 50 MHz max operation |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface and 1-cycle access at 50 MHz |
| SRAM | 64 KB on-chip SRAM, zero-wait-state operation at full speed |
| ADC | 8-channel 12-bit SAR ADC with 1 MSPS sample rate, hardware averaging, and internal temperature sensor |
| Hibernate Module | Dedicated hibernation controller with 2 KB battery-backed RAM, RTC, and wake-on-RTC-match or GPIO |
| Timers | Eight 16-bit GPTMs (configurable as four 32-bit or eight 16-bit), including RTC and PWM modes |
| Communication | Two UARTs (one with IrDA/SIR), one I²C, one SSI, all with FIFO and programmable baud rates |
Pinout & Package
LM3S1751-EQC50-A2T is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per TI SPMS029I datasheet Rev I, July 2014.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate digital core (VDDC), analog (VDDA), and I/O (VDD) rails enable noise isolation for ADC and timing stability |
| GND, GNDA, GNDC | Ground returns | Dedicated analog ground (GNDA) and core ground (GNDC) reduce coupling between signal domains |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO ports | Multi-function pins supporting UART, I²C, SSI, PWM, timer capture, and ADC input with software-selectable drive strength |
| XTAL, XTAL32 | Clock inputs | Supports main 4–25 MHz crystal oscillator and optional 32.768 kHz RTC crystal for hibernation timekeeping |
| nRST, nWAKE | Reset & wake control | Asynchronous active-low reset; nWAKE enables wake-from-hibernate via external event |
Key Features
| Feature | Design Value |
|---|---|
| Hibernate with RTC | Enters sub-µA sleep state while maintaining real-time clock accuracy and retaining 2 KB of RAM using backup battery |
| Integrated ADC | 8-channel 12-bit SAR converter with 1 MSPS throughput, programmable sample averaging, and on-die temperature sensor |
| Cortex-M3 Debug | SWD/JTAG interface with full NVIC visibility, hardware breakpoints, watchpoints, and trace port interface unit (TPIU) |
| Peripheral Flexibility | GPIO pins support multiple alternate functions (UART0/1, I²C0, SSI0, PWM0/1, Timer0–7, ADC0) with run-time reconfiguration |
| Power Management | Five power modes (run, sleep, deep-sleep, hibernate, shutdown) with dynamic clock gating and voltage scaling support |
Applications
| Industrial Sensor Node | Smart Metering Endpoint |
|---|---|
Use Scenario: Battery-powered remote sensor collecting temperature, humidity, and pressure data at 1-minute intervals. IC Role / Device Role / Timing Role: Main system controller executing sensor polling, data preprocessing, and wireless transmission scheduling. Use Value: Hibernate mode draws <1.5 µA while maintaining RTC and 2 KB RAM, enabling multi-year battery life without compromising timestamp accuracy. | Use Scenario: Electricity meter requiring tamper detection, pulse counting, and secure data logging with time-stamped events. IC Role / Device Role / Timing Role: Real-time data aggregator with precise time-of-use billing via integrated RTC and hibernation-aware wake-up triggers. Use Value: On-chip 12-bit ADC acquires voltage/current waveforms; RTC match interrupts initiate metering cycles independent of main CPU activity. |
| Motor Control Interface | Building Automation Controller |
Use Scenario: Compact HVAC actuator board controlling DC brushless fan speed and monitoring thermal feedback. IC Role / Device Role / Timing Role: Real-time motor commutation controller with PWM generation, ADC-based current sensing, and fault response. Use Value: Eight 16-bit timers support simultaneous PWM output (up to 8 channels), quadrature encoder input, and dead-time insertion for gate driver safety. | Use Scenario: Distributed lighting control node managing DALI or 0–10 V dimming outputs based on occupancy and ambient light. IC Role / Device Role / Timing Role: Local decision engine interfacing with I²C sensors, UART-connected gateway, and PWM-driven LED drivers. Use Value: Dual UARTs allow concurrent DALI bus communication and cloud-uplink via cellular modem; I²C supports multi-sensor fusion without additional bridge ICs. |
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 device with same Cortex-M4F core, 256 KB flash, but higher 80 MHz clock, FPU, and enhanced peripheral set (USB, CAN) | Requires PCB redesign due to 64-pin LQFP vs. 100-pin; lacks hibernation-optimized power architecture of LM3S series | Select when floating-point math or USB host/device is required; not drop-in compatible |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB RAM, but no dedicated hibernate module or battery-backed RAM | No native RTC-with-backup-RAM hibernation; requires external RTC + SRAM for equivalent low-power retention | Choose for cost-sensitive designs where external hibernation components are acceptable |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S1751-EQC50-A2T delivers uniquely optimized ultra-low-power hibernation with integrated RTC and battery-backed memory - critical for battery-operated endpoints where firmware must retain state and time across years of sleep without external components.
Availability
LM3S1751-EQC50-A2T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering endpoints, motor control interfaces, and building automation controllers requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1751-EQC50-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.
The Stellaris LM3S family was designed specifically for cost-sensitive, power-constrained embedded control applications requiring deterministic real-time performance, integrated analog front-ends, and robust low-power hibernation - targeting industrial automation, energy metering, and sensor edge devices.
FAQ
What is the maximum operating frequency of the LM3S1751-EQC50-A2T?
The LM3S1751-EQC50-A2T 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 driven by the main oscillator (4–25 MHz crystal). The Cortex-M3 core executes Thumb-2 instructions at this rate with zero-wait-state access to both flash and SRAM, ensuring deterministic real-time performance for time-critical control loops.
Does the LM3S1751-EQC50-A2T support hibernation with RTC and battery-backed memory?
Yes, the LM3S1751-EQC50-A2T includes a dedicated hibernation module that supports sub-µA sleep current, a 32.768 kHz RTC, and 2 KB of battery-backed SRAM. When powered from a backup source (e.g., coin cell), it retains time and critical data during main power loss. Wake-up can be triggered by RTC match, external GPIO, or HIBERNATE pin assertion - all documented in Section 6 of the SPMS029I datasheet.
How many ADC channels does the LM3S1751-EQC50-A2T have, and what is its resolution?
The LM3S1751-EQC50-A2T features an 8-channel, 12-bit successive approximation register (SAR) ADC with up to 1 MSPS sampling rate. Channels support single-ended or differential input configurations, hardware sample averaging (2x–64x), and integration of an internal temperature sensor. All specifications are confirmed in Section 11 of the SPMS029I datasheet and validated in TI's production test flow.
What communication interfaces are integrated into the LM3S1751-EQC50-A2T?
The LM3S1751-EQC50-A2T integrates two UARTs (one supporting IrDA/SIR), one I²C master/slave interface, and one SSI (SPI-compatible) port. Each interface includes FIFO buffers, programmable baud rates, and interrupt capability. These peripherals share GPIO pins via alternate function mapping and are fully documented in Sections 12–14 of the SPMS029I datasheet.
Is the LM3S1751-EQC50-A2T pin-compatible with other Stellaris LM3S devices?
No, the LM3S1751-EQC50-A2T is not universally pin-compatible across the LM3S family. While it shares the 100-pin LQFP package with some variants (e.g., LM3S1968), pin assignments for peripherals such as UART, I²C, and ADC differ significantly between models. Board-level compatibility must be verified per device-specific pinout tables in each respective datasheet - the LM3S1751-EQC50-A2T pin mapping is unique to its feature set and silicon revision.
LM3S1751-EQC50-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:
- Obsolete
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1751-EQC50-A2T FAQ
1.How can I place an order for LM3S1751-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1751-EQC50-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-EQC50-A2T reliable?
The price and inventory of LM3S1751-EQC50-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-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1751-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1751-EQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1751-EQC50-A2T?
LM3S1751-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1751-EQC50-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-EQC50-A2T?
For technical support, including LM3S1751-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1751-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S1751-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1751-EQC50-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-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1751-EQC50-A2T?
All LM3S1751-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1751-EQC50-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-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S1751-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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