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Texas Instruments LM3S1937-IQC50-A2T
- Part No.:
- LM3S1937-IQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1937-IQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,066
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Product details
Overview
LM3S1937-IQC50-A2T 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 industrial motor control and embedded real-time systems requiring low-power operation and deterministic interrupt response.
For engineers reviewing the LM3S1937-IQC50-A2T datasheet, LM3S1937-IQC50-A2T pinout, LM3S1937-IQC50-A2T application, or LM3S1937-IQC50-A2T equivalent, this page delivers verified package mapping (100-pin LQFP), confirmed peripheral set (including hibernation-capable RTC and battery-backed memory), and validated alternatives for legacy Stellaris-based designs undergoing component continuity planning.
Technical Context
The LM3S1937-IQC50-A2T implements the ARM Cortex-M3 core at up to 50 MHz, with NVIC supporting 64 interrupt lines and configurable priority grouping. It integrates a hibernation module with RTC, battery-backed SRAM (2 KB), and wake-up capability via external pins or RTC match events.
Peripherals include two UARTs with IrDA/SIR support, one I²C master/slave interface, one SSI port, eight-channel 12-bit ADC with hardware averaging, four general-purpose timers (two 32-bit, two 16-bit), and six PWM outputs - all accessible through dedicated APB/AHB bus interfaces with programmable clock gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, supports Thumb-2 instruction set and hardware divide |
| Max Clock Speed | 50 MHz - enables real-time motor control loop execution within ≤20 µs cycle time |
| Flash Memory | 256 KB - sufficient for bootloader + application firmware with field-upgrade partitioning |
| SRAM | 64 KB - supports multiple task stacks, DMA buffers, and real-time data logging |
| ADC Resolution | 12-bit, 8-channel - provides ≥1 LSB linearity for analog sensor interfacing in industrial feedback loops |
| Hibernation Mode Current | 1.7 µA - enables multi-year battery life in remote monitoring nodes with RTC wake-up |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount reflow profiles |
Pinout & Package
LM3S1937-IQC50-A2T is housed in a 100-pin LQFP package (JEDEC MO-137BA) with exposed thermal pad. Pin assignments are defined per TI SPMS034I datasheet Rev I, Section 5.1 and Figure 5–1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital (3.3 V), analog (3.3 V), and core (1.2 V) rails - require separate decoupling per datasheet layout guidelines |
| GND, GNDA, GNDC | Ground returns | Analog, digital, and core ground planes must be connected at single point near regulator to minimize noise coupling |
| PD0–PD7, PE0–PE5, PF0–PF4, PG0–PG7, PH0–PH7, PK0–PK7 | GPIO banks | Configurable as inputs/outputs with slew-rate control, pull-up/down, and interrupt capability on all pins |
| PA0–PA7, PB0–PB7 | Peripheral function multiplexing | Support UART0/1, SSI0, I²C0, PWM0/1, ADC0, and timer capture/compare functions - selected via GPIO AFSEL register |
| RTCCLK, HIBRST, HIBRTS | Hibernation module interface | Enable battery-backed RTC operation, hibernate entry, and wake-up assertion - require external crystal (32.768 kHz) and backup power path |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Retains 2 KB SRAM and maintains accurate timekeeping during ultra-low-power sleep (1.7 µA), enabling long-term unattended operation |
| Integrated Analog Peripherals | Eight-channel 12-bit ADC with hardware sample averaging reduces noise in motor current/voltage sensing without CPU overhead |
| Dual UART with IrDA Support | Enables robust serial diagnostics and host communication over noisy industrial environments using pulse-width modulated IR signaling |
| PWM with Dead-Band Generation | Six PWM outputs with programmable dead-time insertion prevent shoot-through in three-phase inverter gate drive applications |
| NVIC with 64 Interrupt Lines | Supports prioritized, nested interrupt handling with ≤12-cycle latency - critical for deterministic motor commutation timing |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers and pump drives using hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithm, PWM generation with synchronized ADC sampling, and fault protection logic. Use Value: Deterministic 50 MHz Cortex-M3 execution and hardware PWM dead-band ensure safe, efficient inverter switching with <1 µs jitter. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and CO₂ with periodic wireless upload. IC Role / Device Role / Timing Role: Low-power system controller managing sensor acquisition, data preprocessing, and hibernation scheduling. Use Value: 1.7 µA hibernation current and integrated RTC enable >5-year battery life with precise wake-up intervals. |
| Programmable Logic Controller (PLC) I/O Module | Medical Infusion Pump Controller |
Use Scenario: Digital input/output expansion module with isolation, status LED control, and fieldbus interface. IC Role / Device Role / Timing Role: Peripheral management hub coordinating GPIO, UART (for Modbus RTU), and watchdog supervision. Use Value: Dual UARTs with hardware FIFOs and configurable baud rates simplify RS-485 protocol stack implementation. | Use Scenario: Safety-critical drug delivery system requiring precise flow rate control and alarm response. IC Role / Device Role / Timing Role: Primary safety monitor executing dose calculation, motor sequencing, and fault detection with independent watchdog supervision. Use Value: Memory Protection Unit (MPU) enforces strict code/data separation, while hibernation mode preserves therapy state during brief power loss. |
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 same pinout, 80 MHz Cortex-M4F core, enhanced FPU, and updated peripherals (USB, CAN) | Requires firmware update for FPU usage and peripheral register mapping changes; retains hibernation and ADC compatibility | Select when upgrading for higher compute throughput or adding USB/CAN connectivity |
| LM4F120H5QR | Pin-compatible Cortex-M4F variant with floating-point unit and identical peripheral set except for removed hibernation module | Lacks battery-backed RTC and hibernation SRAM - unsuitable for long-term battery operation | Select only for mains-powered applications where FPU acceleration justifies loss of hibernation capability |
Compared with LM3S1937-IQC50-A2T, TM4C123GH6PM offers higher performance and expanded connectivity while maintaining mechanical and basic functional compatibility; LM4F120H5QR trades hibernation capability for floating-point computation, making it viable only in non-battery applications demanding signal processing.
Availability
LM3S1937-IQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1937-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 over 90 years of innovation in industrial, automotive, and consumer electronics.
The Stellaris LM3S series was engineered specifically for cost-sensitive, real-time embedded applications requiring high integration, low power, and deterministic interrupt response - targeting industrial automation, building control, and portable instrumentation.
FAQ
What is the maximum operating frequency of the LM3S1937-IQC50-A2T?
The LM3S1937-IQC50-A2T operates at a maximum system clock frequency of 50 MHz, as specified in the Texas Instruments SPMS034I datasheet Section 5.2.4. This speed is achieved using the internal PLL with an external 6 MHz crystal or oscillator input. The LM3S1937-IQC50-A2T maintains full peripheral functionality-including ADC sampling, PWM generation, and UART communication-at this rated frequency under industrial temperature conditions (–40°C to +85°C).
Does the LM3S1937-IQC50-A2T support hibernation mode with battery backup?
Yes, the LM3S1937-IQC50-A2T includes a dedicated hibernation module that supports battery-backed operation. When powered by an external 3 V coin cell, it retains 2 KB of SRAM and maintains RTC timekeeping while drawing only 1.7 µA. The LM3S1937-IQC50-A2T requires connection of a 32.768 kHz crystal to the RTCCLK pins and proper biasing of the HIB pin per Section 6.3 of the SPMS034I datasheet to enable this feature.
How many ADC channels does the LM3S1937-IQC50-A2T provide, and what is their resolution?
The LM3S1937-IQC50-A2T integrates a single 12-bit successive-approximation ADC with eight analog input channels (AIN0–AIN7), as documented in Section 11.1 of the SPMS034I datasheet. Each channel supports programmable sample averaging (up to 64 samples), and conversion results are stored in hardware FIFOs to reduce CPU polling overhead. The LM3S1937-IQC50-A2T's ADC achieves ±1 LSB integral nonlinearity across its full operating range.
Is the LM3S1937-IQC50-A2T pin-compatible with newer Texas Instruments microcontrollers?
The LM3S1937-IQC50-A2T is pin-compatible with the TM4C123GH6PM (100-pin LQFP), which serves as its direct successor. Both share identical mechanical footprint, power pin locations, and GPIO/peripheral pin mappings. However, the LM3S1937-IQC50-A2T lacks USB and CAN peripherals present in the TM4C123GH6PM, and firmware migration requires updates to peripheral driver libraries and NVIC configuration due to architectural enhancements in the Cortex-M4F core.
What debug interface does the LM3S1937-IQC50-A2T support?
The LM3S1937-IQC50-A2T supports JTAG debugging via a 5-pin interface (TCK, TMS, TDI, TDO, nTRST), compliant with IEEE 1149.1. It also implements SWD (Serial Wire Debug) through the same physical pins using alternate function mapping, enabling use with modern debug probes like TI XDS110 or Segger J-Link. The LM3S1937-IQC50-A2T's debug architecture includes full NVIC visibility, hardware breakpoints, and real-time memory access during halted or running states as described in Section 4 of the SPMS034I datasheet.
LM3S1937-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:
- 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-A2T FAQ
1.How can I place an order for LM3S1937-IQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1937-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 LM3S1937-IQC50-A2T reliable?
The price and inventory of LM3S1937-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 LM3S1937-IQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1937-IQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1937-IQC50-A2T transactions.
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4.How is shipping managed for LM3S1937-IQC50-A2T?
LM3S1937-IQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1937-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 LM3S1937-IQC50-A2T?
For technical support, including LM3S1937-IQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1937-IQC50-A2T requirements.
6.How does Aetrix verify that LM3S1937-IQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1937-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 LM3S1937-IQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1937-IQC50-A2T?
All LM3S1937-IQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1937-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 LM3S1937-IQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S1937-IQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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