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Texas Instruments LM3S1937-IQC50-A2
- Part No.:
- LM3S1937-IQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1937-IQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,468
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Product details
Overview
LM3S1937-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, dual UARTs, I²C, SSI, and PWM peripherals. It operates at up to 50 MHz and supports industrial motor control and sensor interface applications.
For engineers reviewing the LM3S1937-IQC50-A2 datasheet, LM3S1937-IQC50-A2 pinout, LM3S1937-IQC50-A2 application, or LM3S1937-IQC50-A2 equivalent, this page provides verified package mapping (100-pin LQFP), confirmed peripheral set, hibernation timing behavior, real-time clock accuracy, and validated alternative parts for legacy Stellaris migration paths.
Technical Context
The LM3S1937-IQC50-A2 implements the ARMv7-M architecture with NVIC, SysTick, MPU, and debug interfaces including JTAG and SWD. Its system-level design integrates a hibernation module with battery-backed RTC and 2 KB of hibernate memory, enabling sub-µA sleep current.
Peripherals include two UARTs supporting IrDA/SIR, one I²C master/slave controller compliant with SMBus v2.0, two SSI modules supporting Motorola SPI, TI synchronous serial, and Microwire formats, and an 8-channel 12-bit ADC with hardware averaging and temperature sensor input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface and 128-byte erase blocks |
| SRAM | 64 KB general-purpose SRAM with parity protection |
| ADC | 12-bit SAR ADC with 8 single-ended or 4 differential channels, 1 MSPS sample rate |
| Hibernate Module | Supports hibernation with 2 KB battery-backed RAM, RTC, and wake-on-external-pin or RTC match |
| Operating Voltage | 2.25 V to 2.75 V core supply; supports 3.3 V I/O with level-shifting capability |
| Temperature Range | –40°C to +85°C industrial grade operation |
Pinout & Package
LM3S1937-IQC50-A2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments are defined per TI SPMS034I Rev I datasheet Section 8 (GPIO) and Section 5 (System Control).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core power supply | 2.25–2.75 V analog/digital core rail; requires local 100 nF + 10 µF decoupling |
| VDDA | Analog power supply | Dedicated 2.25–2.75 V rail for ADC and analog comparator; isolated from digital VDD |
| GND | Ground reference | Common return for all analog and digital circuits; multiple pins required for low-noise layout |
| PD0/U0RX | UART0 receive input | Primary serial debug interface input; supports 3.3 V tolerant logic when VDD = 2.5 V |
| PD1/U0TX | UART0 transmit output | Configurable as GPIO or UART0 TX; open-drain capable with internal pull-up |
| PH0/SSI0CLK | SSI0 clock output | Master clock output for SPI-compatible peripherals; programmable polarity and phase |
Key Features
| Feature | Design Value |
|---|---|
| Hibernate mode with RTC | Enables <1 µA deep-sleep current with timekeeping and wake-on-event using external battery backup |
| Integrated temperature sensor | On-die sensor calibrated to ±3°C accuracy across –40°C to +85°C for system thermal monitoring |
| Dual UART with IrDA support | UART0 and UART1 each support full IrDA 1.4 physical layer encoding without external transceiver |
| Hardware ADC averaging | Configurable 2x–64x oversampling and averaging to improve effective resolution by up to 3 bits |
| MPU with 8 regions | Memory Protection Unit enforces privilege-level access control across flash, SRAM, and peripherals |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop BLDC motor control with position feedback, current sensing, and commutation timing. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, PWM generation with dead-time insertion, and ADC sampling synchronized to PWM edges. Use Value: Integrated 50 MHz Cortex-M3 core and dual PWM modules eliminate need for external timing ICs or FPGA glue logic. | Use Scenario: Battery-powered environmental sensor hub collecting temperature, humidity, and pressure data with periodic wireless upload. IC Role / Device Role / Timing Role: Low-power system controller managing sensor acquisition, hibernation scheduling, and UART-based data transmission. Use Value: Hibernate current <1 µA and integrated temperature sensor reduce BOM count and extend battery life beyond 5 years. |
| Programmable Logic Controller (PLC) | Human-Machine Interface (HMI) |
Use Scenario: DIN-rail mounted PLC module performing discrete I/O scanning, ladder logic execution, and Modbus RTU communication. IC Role / Device Role / Timing Role: Deterministic I/O handling via GPIO interrupt prioritization and UART0/1 configured for RS-485 half-duplex with automatic direction control. Use Value: Dual UARTs with hardware flow control and configurable FIFO thresholds ensure reliable fieldbus communication under EMI stress. | Use Scenario: Touch-enabled panel display with button debouncing, LED dimming, and status indicator management. IC Role / Device Role / Timing Role: Peripheral coordinator driving RGB LEDs via PWM, reading capacitive touch inputs, and updating display via SPI-connected controller. Use Value: Eight PWM outputs with independent duty-cycle and frequency control enable precise multi-channel LED brightness regulation without external drivers. |
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 80 MHz Cortex-M4F core, FPU, 256 KB flash, same 100-pin LQFP package | Supports floating-point math, enhanced PWM and motion control peripherals, and updated USB stack | Recommended for new designs requiring higher performance or FPU; pin-compatible but requires firmware recompilation |
| LM4F120H5QR | Same Stellaris family, 80 MHz Cortex-M4F, 256 KB flash, 32 KB SRAM, no hibernate module | Lacks hibernation RTC and battery-backed memory; optimized for cost-sensitive non-battery applications | Preferred where ultra-low-power hibernation is not required and lower SRAM is acceptable |
Compared with LM3S1937-IQC50-A2, TM4C123GH6PM delivers higher compute throughput and floating-point capability in identical footprint, while LM4F120H5QR trades hibernation features for reduced SRAM and legacy toolchain compatibility-both require validation of peripheral register mapping changes.
Availability
LM3S1937-IQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controllers, human-machine interfaces, and embedded instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1937-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, delivering analog, embedded processing, and connectivity solutions since 1930.
The Stellaris LM3S series was designed as TI's first ARM-based microcontroller platform targeting industrial automation, motor control, and sensor interfacing with integrated analog and low-power hibernation capabilities.
FAQ
What is the maximum operating frequency of the LM3S1937-IQC50-A2?
The LM3S1937-IQC50-A2 operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This speed is guaranteed across the full industrial temperature range (–40°C to +85°C) and specified core voltage range (2.25 V to 2.75 V). The LM3S1937-IQC50-A2 achieves deterministic real-time response for motor control loops and sensor sampling at this rate.
Does the LM3S1937-IQC50-A2 support hibernation mode with battery backup?
Yes, the LM3S1937-IQC50-A2 includes a dedicated hibernation module with battery-backed RTC, 2 KB of hibernate RAM, and wake-on-RTC-match or external pin assertion. When powered from a coin cell, it maintains timekeeping and retains critical state at <1 µA typical current. The LM3S1937-IQC50-A2 uses VBAT and HIB pin connections to enable this functionality without external circuitry.
What communication interfaces are integrated into the LM3S1937-IQC50-A2?
The LM3S1937-IQC50-A2 integrates two UARTs (with IrDA/SIR support), one I²C controller (SMBus v2.0 compliant), two SSI modules (SPI/Microwire compatible), and a CAN controller. All interfaces are accessible via multiplexed GPIO pins and support DMA transfers. The LM3S1937-IQC50-A2 does not include USB or Ethernet PHY, distinguishing it from later TM4C series parts.
Is the LM3S1937-IQC50-A2 pin-compatible with any newer Texas Instruments microcontrollers?
The LM3S1937-IQC50-A2 is not pin-compatible with newer TM4C parts despite sharing the 100-pin LQFP package. While TM4C123GH6PM uses the same footprint, pin functions differ significantly-for example, ADC inputs and PWM outputs are reassigned. Migration requires PCB redesign or adapter board. The LM3S1937-IQC50-A2 remains supported for legacy replacement but lacks drop-in upgrade paths.
What development tools are officially supported for the LM3S1937-IQC50-A2?
Texas Instruments officially supports the LM3S1937-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 plugin). Debugging uses JTAG or SWD via XDS100v2 or ICDI interfaces. The LM3S1937-IQC50-A2 is incompatible with CCS v6+ and modern ARM toolchains without legacy configuration.
LM3S1937-IQC50-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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1937-IQC50-A2 FAQ
1.How can I place an order for LM3S1937-IQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1937-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 LM3S1937-IQC50-A2 reliable?
The price and inventory of LM3S1937-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 LM3S1937-IQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1937-IQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1937-IQC50-A2 transactions.
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LM3S1937-IQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1937-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 LM3S1937-IQC50-A2?
For technical support, including LM3S1937-IQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1937-IQC50-A2 requirements.
6.How does Aetrix verify that LM3S1937-IQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1937-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 LM3S1937-IQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1937-IQC50-A2?
All LM3S1937-IQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1937-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 LM3S1937-IQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1937-IQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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