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Texas Instruments LM3S1937-EQC50-A2
- Part No.:
- LM3S1937-EQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1937-EQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,847
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Product details
Overview
LM3S1937-EQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (8-channel), dual UARTs, I²C, SSI, PWM, and GPIOs - designed for low-power industrial control and motor drive applications requiring real-time responsiveness and battery-backed operation.
For engineers reviewing the LM3S1937-EQC50-A2 datasheet, LM3S1937-EQC50-A2 pinout, LM3S1937-EQC50-A2 application, or LM3S1937-EQC50-A2 equivalent, key selection considerations include hibernation support with RTC and battery-backed memory, 50 MHz CPU clock speed, QFP-100 package compatibility, and integrated analog/motor control peripherals for embedded motion systems.
Technical Context
The LM3S1937-EQC50-A2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC-based interrupt handling, and memory protection unit (MPU). It integrates a hibernation module with RTC, battery-backed RAM, and wake-up sources including external pins and RTC match events.
Peripherals include two UARTs supporting IrDA/SIR, one I²C master/slave interface, one SSI port, eight PWM generator blocks, an 8-channel 12-bit ADC with hardware averaging, and analog comparators - all operating under a unified clock tree managed by the system control block.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, supports Thumb-2 instructions and NVIC exception model |
| Max Clock Speed | 50 MHz - enables deterministic real-time execution for motor control loops and sensor sampling |
| Flash Memory | 256 KB - sufficient for firmware with bootloader, communication stacks, and control algorithms |
| SRAM | 64 KB - supports real-time data buffering, stack/heap allocation, and hibernation context storage |
| ADC Resolution | 12-bit - provides 4096-level precision for analog sensor inputs like current/voltage feedback |
| Hibernation Support | Integrated hibernation module with RTC, battery-backed RAM, and wake-on-RTC-match capability |
| Package | 100-pin LQFP (EQC) - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
LM3S1937-EQC50-A2 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP), 14 mm × 14 mm body, 0.5 mm pitch, exposed thermal pad (EP), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 3.3 V nominal supply for CPU, memory, and digital logic; requires local decoupling |
| VDDA | Analog Power Supply | Separate 3.3 V supply for ADC and analog comparator to minimize noise coupling |
| GND | Digital Ground | Reference return path for digital I/O and core logic |
| GNDA | Analog Ground | Isolated ground plane for analog subsystems to preserve ADC accuracy |
| OSC0 / OSC1 | Crystal Oscillator Input/Output | Supports external 1–25 MHz crystal for main system clock or precision timing reference |
| HIB | Hibernation Module Enable | Active-low signal controlling entry into hibernation mode; tied high during normal operation |
| RTCCLK | Real-Time Clock Input | Accepts 32.768 kHz watch crystal input for RTC and hibernation timing |
| PD0 / PD1 | UART0 Transmit/Receive | Default UART0 pins supporting asynchronous serial communication at up to 3 Mbps |
| PE4 / PE5 | I²C0 SCL/SDA | Open-drain bidirectional interface for I²C bus communication with standard/fast-mode timing |
| PF0–PF4 | GPIO / Analog Input | Multi-function pins configurable as digital I/O or ADC input channels (AIN0–AIN4) |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Enables ultra-low-power sleep state (< 10 µA) with timekeeping and wake-on-event capability using external battery backup |
| 8-Channel 12-Bit ADC | Supports simultaneous sampling across multiple channels with hardware averaging to improve SNR in noisy industrial environments |
| Dual UART with IrDA/SIR | Provides robust serial communication with infrared modulation support for remote diagnostics and configuration |
| Eight PWM Generator Blocks | Each with two 16-bit PWM outputs - suitable for three-phase motor control with complementary dead-time insertion |
| Integrated Analog Comparators | Two rail-to-rail comparators with programmable reference and interrupt generation for overcurrent/overvoltage fault detection |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC or stepper motors in factory automation equipment with thermal monitoring and emergency stop response. IC Role / Device Role / Timing Role: Central controller executing FOC or trapezoidal commutation, managing PWM timing, ADC sampling, and fault-safe shutdown. Use Value: Integrated hibernation allows energy-efficient standby between production cycles; 50 MHz core ensures sub-microsecond interrupt latency for torque ripple minimization. | Use Scenario: Battery-powered environmental sensor hub collecting temperature, humidity, and vibration data for predictive maintenance. IC Role / Device Role / Timing Role: Data acquisition host with ADC, RTC, and low-power sleep management; schedules periodic wake-ups for measurement bursts. Use Value: Hibernation mode draws < 10 µA while maintaining RTC and 2 KB battery-backed RAM - extending battery life to >5 years on CR2032. |
| Programmable Logic Controller (PLC) I/O Module | Energy Monitoring Gateway |
Use Scenario: DIN-rail mounted I/O expansion module interfacing with discrete sensors, relays, and analog transmitters in building management systems. IC Role / Device Role / Timing Role: Real-time I/O processor handling GPIO interrupts, analog input scaling, and Modbus RTU over UART. Use Value: Dual UARTs enable isolated fieldbus communication and local debug interface simultaneously; 64 KB SRAM buffers protocol payloads without external memory. | Use Scenario: Residential smart metering gateway aggregating current/voltage measurements from CT clamps and communicating via RS-485 or Zigbee. IC Role / Device Role / Timing Role: Precision analog front-end controller performing RMS calculation, harmonic analysis, and time-synchronized logging. Use Value: 12-bit ADC with hardware averaging achieves ±0.5% measurement accuracy at 50/60 Hz; RTC enables tariff-based energy logging with timestamp integrity. |
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 enhanced Cortex-M4F core, floating-point unit, 256 KB flash, same 100-pin LQFP package | Supports DSP-intensive tasks (e.g., FFT-based power quality analysis); lacks hibernation module with battery-backed RAM | Select when migrating legacy LM3S designs to higher performance; verify RTC/hibernation functionality replacement |
| STM32F103VET6 | ARM Cortex-M3 core, 512 KB flash, 64 KB SRAM, 12-bit ADC (16 ch), but no integrated hibernation or battery-backed memory | Requires external RTC and backup power circuitry for low-power timekeeping; broader ecosystem tooling | Choose for cost-sensitive applications where hibernation is implemented externally or not required |
Compared with TM4C123GH6PM and STM32F103VET6, the LM3S1937-EQC50-A2 uniquely delivers integrated hibernation with battery-backed RAM and RTC in a mature, production-qualified platform - making it optimal for long-life, battery-constrained industrial nodes where firmware stability and low-power retention are critical design requirements.
Availability
LM3S1937-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and energy monitoring gateways requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1937-EQC50-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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The Stellaris LM3S series was engineered specifically for deterministic real-time control in resource-constrained embedded systems - emphasizing low-latency interrupt response, integrated analog/motor peripherals, and ultra-low-power hibernation for battery-operated industrial edge devices.
FAQ
What is the maximum operating frequency of the LM3S1937-EQC50-A2?
The LM3S1937-EQC50-A2 operates at a maximum CPU clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This speed enables deterministic execution of real-time control algorithms, such as motor commutation and PID loops, with sub-microsecond interrupt latency. The LM3S1937-EQC50-A2 maintains this performance across its specified industrial temperature range (-40°C to +105°C) when supplied with stable 3.3 V power and proper decoupling.
Does the LM3S1937-EQC50-A2 support hibernation with battery backup?
Yes, the LM3S1937-EQC50-A2 includes a dedicated hibernation module that supports battery-backed operation with real-time clock (RTC) functionality. When powered from a coin-cell battery via the VBAT pin, it retains 2 KB of RAM and maintains accurate timekeeping while drawing less than 10 µA. The LM3S1937-EQC50-A2 can wake on RTC alarm, external GPIO event, or HIB interrupt - making it ideal for energy-harvesting or long-life sensor applications.
What analog peripherals are integrated into the LM3S1937-EQC50-A2?
The LM3S1937-EQC50-A2 integrates an 8-channel, 12-bit analog-to-digital converter (ADC) with hardware sample averaging, two rail-to-rail analog comparators with programmable voltage references, and an internal temperature sensor. These peripherals are optimized for industrial sensing - the ADC supports sequenced sampling and trigger synchronization with PWM timers, while comparators generate interrupts for fast overcurrent or overvoltage fault detection without CPU intervention. All analog functions are accessible through the LM3S1937-EQC50-A2's dedicated VDDA/GNDA power domains.
Which communication interfaces does the LM3S1937-EQC50-A2 provide?
The LM3S1937-EQC50-A2 provides two UARTs (with IrDA/SIR support), one I²C interface (master/slave capable), one SSI port (SPI-compatible), and GPIO-configurable bit-banged protocols. UART0 and UART1 support baud rates up to 3 Mbps and include FIFOs and modem control signals. The I²C interface complies with standard and fast modes (up to 400 kHz), and the SSI supports Motorola, TI, and National Semiconductor frame formats. These interfaces are fully integrated and require no external transceivers for basic operation - a key feature of the LM3S1937-EQC50-A2's system-on-chip architecture.
Is the LM3S1937-EQC50-A2 pin-compatible with other Stellaris devices?
The LM3S1937-EQC50-A2 uses a 100-pin LQFP (EQC) package shared across several LM3S family members, including the LM3S8962 and LM3S811, but pin assignments differ significantly due to peripheral mapping variations. While mechanical footprint compatibility exists, electrical pin functions - especially for analog inputs, PWM outputs, and hibernation signals - are not interchangeable. Therefore, the LM3S1937-EQC50-A2 is not pin-compatible with other Stellaris devices without board-level redesign and firmware adaptation.
LM3S1937-EQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tray
- 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:
- 256KB (256K 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:
LM3S1937-EQC50-A2 FAQ
1.How can I place an order for LM3S1937-EQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1937-EQC50-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 LM3S1937-EQC50-A2 reliable?
The price and inventory of LM3S1937-EQC50-A2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1937-EQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1937-EQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1937-EQC50-A2 transactions.
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4.How is shipping managed for LM3S1937-EQC50-A2?
LM3S1937-EQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1937-EQC50-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 LM3S1937-EQC50-A2?
For technical support, including LM3S1937-EQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1937-EQC50-A2 requirements.
6.How does Aetrix verify that LM3S1937-EQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1937-EQC50-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 LM3S1937-EQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1937-EQC50-A2?
All LM3S1937-EQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1937-EQC50-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 LM3S1937-EQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1937-EQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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