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Texas Instruments LM3S1637-IQC50-A2
- Part No.:
- LM3S1637-IQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1637-IQC50-A2.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,456
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Product details
Overview
LM3S1637-IQC50-A2 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 -40°C to +85°C industrial temperature range, and targets motor control and embedded sensing systems requiring low-power operation with real-time responsiveness.
For engineers reviewing the LM3S1637-IQC50-A2 datasheet, LM3S1637-IQC50-A2 pinout, LM3S1637-IQC50-A2 application, or LM3S1637-IQC50-A2 equivalent, key selection criteria include hibernation-capable power management, integrated analog peripherals (ADC + comparator), and dual UART + I²C + SSI serial interfaces for industrial connectivity.
Technical Context
The LM3S1637-IQC50-A2 implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic interrupt handling and memory protection. It integrates a dedicated hibernation module with battery-backed RTC and SRAM, supporting sub-μA sleep current and wake-up via external pins or RTC match.
Analog subsystem includes an 8-channel 12-bit ADC with hardware averaging and two analog comparators with internal reference. Serial interface set comprises two UARTs (one with IrDA/SIR), one I²C master/slave, and one SSI controller-enabling sensor fusion, motor feedback, and multi-protocol fieldbus interfacing without external glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, 50 MHz max clock - enables real-time deterministic execution with Thumb-2 instruction set and hardware divide. |
| Memory | 256 KB on-chip flash + 32 KB SRAM - sufficient for standalone firmware with bootloader, sensor processing, and communication stacks. |
| ADC | 8-channel 12-bit SAR ADC with 1 MSPS sample rate and hardware averaging - supports precision analog input acquisition from multiple sensors simultaneously. |
| Hibernation Module | Battery-backed RTC + 2 KB hibernate RAM + sub-1 μA deep-sleep current - enables years-long battery operation in remote monitoring nodes. |
| Serial Interfaces | 2× UART (1 with IrDA), 1× I²C, 1× SSI - provides native support for Modbus RTU, sensor I²C buses, and SPI-based encoders or displays. |
| Temperature Range | -40°C to +85°C - qualified for industrial environments including factory automation and outdoor metering equipment. |
| Package | 100-pin LQFP (14 mm × 14 mm) - compatible with standard surface-mount assembly and offers full peripheral pin access including GPIO, analog, and debug signals. |
Pinout & Package
LM3S1637-IQC50-A2 is housed in a 100-pin LQFP package (JEDEC MS-026AC, 0.5 mm pitch). All pins are electrically and functionally validated per TI SPMS028I datasheet Rev I (July 2014).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital core (VDD), analog (VDDA), and hibernate (VDDC) rails - require separate filtering; VDDC enables RTC retention during main power loss. |
| PD0–PD7, PE0–PE5, PF0–PF4, PG0–PG7, PH0–PH7, PJ0–PJ7, PK0–PK7 | GPIO banks | Eight configurable GPIO ports with alternate functions - support PWM output, UART/SSI/I²C remapping, and edge-triggered interrupts for event-driven sensing. |
| AIN0–AIN7 | ADC input channels | Dedicated analog input pins mapped to ADC sequencer inputs - support differential sampling and internal temperature sensor readout. |
| SSI0CLK, SSI0FSS, SSI0RX, SSI0TX | SSI interface signals | Full-duplex synchronous serial interface - connects directly to SPI-compatible sensors, displays, or digital potentiometers without level-shifting. |
| UART0RX, UART0TX, UART1RX, UART1TX | UART transceiver I/O | Two independent UARTs - UART0 supports IrDA physical layer; both support automatic baud-rate detection and FIFO buffering. |
| I2C0SCL, I2C0SDA | I²C bus signals | Open-drain bidirectional interface - compliant with standard-mode (100 kbps) and fast-mode (400 kbps) I²C protocols for sensor and EEPROM interfacing. |
| SWCLK, SWDIO | ARM Serial Wire Debug | 2-pin debug interface replacing JTAG - reduces PCB footprint while supporting full SWD programming, breakpoint, and real-time trace. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Enables ultra-low-power operation (<1 μA) with time-stamped wake-up events and battery-backed memory retention - critical for battery-powered telemetry endpoints. |
| Integrated Analog Subsystem | Combines 8-channel 12-bit ADC, two analog comparators, and internal temperature sensor - eliminates need for external signal conditioning in thermal or motor current monitoring. |
| Dual UART with IrDA Support | One UART includes integrated IrDA encoder/decoder - allows direct infrared communication with handheld diagnostics tools without external transceivers. |
| Peripheral Pin Multiplexing | All major peripherals (UART, SSI, I²C, PWM, ADC) share GPIO pins with flexible remapping - simplifies PCB layout and enables dynamic interface reconfiguration in firmware. |
| ARM Cortex-M3 with MPU | Hardware memory protection unit isolates application code from driver and system layers - improves reliability in safety-critical industrial firmware deployments. |
Applications
| Motor Control System | Industrial Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time motor commutation controller with ADC sampling of phase currents and back-EMF, synchronized PWM generation, and UART-based commissioning interface. Use Value: Integrated hibernation allows standby mode between operational cycles; dual UART enables simultaneous field service diagnostics and Modbus RTU slave communication. | Use Scenario: Wireless environmental monitor deployed in unpowered substations, powered by solar-charged Li-ion battery. IC Role / Device Role / Timing Role: Low-power data acquisition hub collecting temperature, humidity, and voltage readings, then transmitting via UART-to-LoRa module. Use Value: Sub-μA hibernation current extends battery life to >5 years; internal temperature sensor enables self-calibration of ADC references. |
| Programmable Logic Controller (PLC) I/O Module | Smart Energy Meter Interface |
Use Scenario: DIN-rail mounted I/O expansion module adding analog input capability to legacy PLC racks via RS-485. IC Role / Device Role / Timing Role: Isolated analog front-end processor converting 4–20 mA sensor signals to digital values, then formatting and transmitting over Modbus RTU. Use Value: Hardware ADC averaging reduces noise in industrial EMI environments; SSI interface supports isolated SPI-to-RS-485 transceiver ICs. | Use Scenario: Tamper-resistant electricity meter with voltage/current measurement, time-of-use billing, and secure firmware updates. IC Role / Device Role / Timing Role: Secure metering controller executing metrology algorithms, managing RTC calendar, and verifying signed firmware images before update. Use Value: Hibernation module maintains accurate timekeeping during mains outage; MPU enforces secure boot and prevents unauthorized code injection. |
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 part with same pinout, 80 MHz Cortex-M4F core, 256 KB flash, 32 KB SRAM, but no hibernation module - requires external RTC for timekeeping during power loss. | Lacks integrated hibernation and battery-backed RAM - unsuitable for long-term battery operation without added components. | Select when higher CPU performance and FPU are needed, and external RTC/battery backup can be accommodated. |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB SRAM, no hibernation module, different peripheral set (no SSI, single I²C, no IrDA UART). | No native hibernation or IrDA support - demands additional ICs for infrared diagnostics or extended battery runtime. | Choose for cost-sensitive designs where STM32 ecosystem tooling and broader community support outweigh missing hibernation features. |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S1637-IQC50-A2 uniquely delivers integrated hibernation with RTC and battery-backed RAM in a mature industrial-qualified package - making it optimal for battery-constrained, time-aware embedded systems where minimizing BOM count and power budget is critical.
Availability
LM3S1637-IQC50-A2 is available at Aetrix Electronics and suitable for motor control systems, industrial sensor nodes, programmable logic controller (PLC) I/O modules, and smart energy meter interfaces requiring stable component supply across extended product lifecycles.
Supply support for LM3S1637-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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The Stellaris LM3S series was designed specifically for cost-sensitive, low-power industrial control applications - integrating hibernation, analog peripherals, and multiple serial interfaces into a single ARM Cortex-M3 MCU to reduce system complexity and bill-of-materials.
FAQ
What is the maximum operating frequency of the LM3S1637-IQC50-A2?
The LM3S1637-IQC50-A2 operates at a maximum system clock frequency of 50 MHz, as specified in the Texas Instruments SPMS028I datasheet. This frequency is achieved using the internal PLL with an external crystal or oscillator input. The LM3S1637-IQC50-A2 maintains full peripheral functionality-including ADC sampling, UART transmission, and PWM generation-at this rated speed under industrial temperature conditions (-40°C to +85°C).
Does the LM3S1637-IQC50-A2 support hardware debugging?
Yes, the LM3S1637-IQC50-A2 supports ARM Serial Wire Debug (SWD) via dedicated SWCLK and SWDIO pins, enabling full programming, breakpoint setting, and real-time variable inspection. It does not require JTAG; SWD uses only two pins and is supported by TI's Code Composer Studio and third-party tools like OpenOCD. The LM3S1637-IQC50-A2 also includes NVIC-integrated debug exception handling for robust firmware development.
What analog peripherals are integrated into the LM3S1637-IQC50-A2?
The LM3S1637-IQC50-A2 integrates an 8-channel 12-bit successive approximation register (SAR) ADC with up to 1 MSPS sampling rate, hardware averaging across up to 64 samples, and support for differential input modes. It also includes two analog comparators with programmable internal voltage reference and hysteresis control. The LM3S1637-IQC50-A2 further embeds an internal temperature sensor accessible via ADC channel AIN6.
How does the hibernation module in the LM3S1637-IQC50-A2 function?
The hibernation module in the LM3S1637-IQC50-A2 provides ultra-low-power state management with battery-backed RTC, 2 KB hibernate RAM, and wake-up sources including external pins, RTC alarm, and low-battery detection. When active, it draws less than 1 μA from VDDC. The LM3S1637-IQC50-A2 retains critical state and timekeeping during main power loss - a feature confirmed in Section 6 of the SPMS028I datasheet and essential for long-life battery applications.
Is the LM3S1637-IQC50-A2 pin-compatible with other Stellaris devices?
The LM3S1637-IQC50-A2 uses a 100-pin LQFP package shared with several other LM3S devices (e.g., LM3S1968, LM3S8962), but pin functions are not fully interchangeable due to differing peripheral mappings and internal routing. While mechanical footprint is identical, signal assignments for UART, SSI, and ADC vary across the family. Therefore, the LM3S1637-IQC50-A2 is not a drop-in replacement for other LM3S parts without schematic and firmware review.
LM3S1637-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, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 43
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K 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:
LM3S1637-IQC50-A2 FAQ
1.How can I place an order for LM3S1637-IQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1637-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 LM3S1637-IQC50-A2 reliable?
The price and inventory of LM3S1637-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 LM3S1637-IQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1637-IQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1637-IQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1637-IQC50-A2?
LM3S1637-IQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1637-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 LM3S1637-IQC50-A2?
For technical support, including LM3S1637-IQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1637-IQC50-A2 requirements.
6.How does Aetrix verify that LM3S1637-IQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1637-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 LM3S1637-IQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1637-IQC50-A2?
All LM3S1637-IQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1637-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 LM3S1637-IQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1637-IQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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