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Texas Instruments LM3S6537-IQC50-A2T
- Part No.:
- LM3S6537-IQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6537-IQC50-A2T.pdf
- Description:
- IC MCU 32BIT 96KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,902
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Product details
Overview
LM3S6537-IQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated Ethernet MAC, dual UARTs, I²C, SSI, ADC (10-bit, 8-channel), and hibernation module. It operates at 50 MHz and supports industrial temperature range (–40°C to +85°C) in a 100-pin LQFP package. Used in networked industrial controllers requiring deterministic real-time response and low-power hibernation.
For engineers reviewing the LM3S6537-IQC50-A2T datasheet, LM3S6537-IQC50-A2T pinout, LM3S6537-IQC50-A2T application, or LM3S6537-IQC50-A2T equivalent, key selection criteria include Ethernet MAC integration, hibernation current (≤1.9 µA), 50 MHz CPU clock, 100-pin LQFP mechanical compatibility, and StellarisWare® software support for rapid firmware development.
Technical Context
The LM3S6537-IQC50-A2T implements the ARMv7-M architecture with NVIC, SysTick, and MPU for deterministic interrupt handling and memory protection. Its system-level peripherals include a hibernation module with RTC, battery-backed RAM, and wake-on-external-event capability - enabling ultra-low-power operation without external circuitry.
It integrates an IEEE 802.3-compliant Ethernet MAC with MII interface, supporting full-duplex 10/100 Mbps operation. The analog subsystem includes a 10-bit, 1 Msps ADC with four independent sample sequencers and internal temperature sensor - suitable for closed-loop monitoring in embedded control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions for compact code and high efficiency. |
| Max Clock Speed | 50 MHz - enables real-time control loops with sub-10 µs ISR latency and deterministic timing. |
| Flash / SRAM | 256 KB flash (in-system programmable) + 64 KB SRAM - sufficient for Ethernet stack + application logic without external memory. |
| ADC | 10-bit, 1 Msps, 8-channel with 4 sequencers - supports simultaneous sampling of multiple sensors in motor control or power monitoring. |
| Hibernate Current | ≤1.9 µA - allows battery-powered remote nodes to operate for years on coin-cell batteries. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard industrial PCB assembly processes. |
| Temperature Range | –40°C to +85°C - qualified for deployment in factory automation, HVAC, and outdoor metering environments. |
Pinout & Package
LM3S6537-IQC50-A2T is housed in a 100-pin LQFP (Pb-free, RoHS-compliant) with exposed thermal pad. Pin functions are defined per TI SPMS131I datasheet Rev I (July 2014), including dedicated Ethernet MII signals (TXD[3:0], RXD[3:0], TXEN, RXER), dual UARTs (UART0/1), two SSI ports, I²C, GPIOs with slew-rate control, and hibernation-specific pins (HIBERNATE, WAKE, RTCCLK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA0–PA7 | GPIO Port A | Configurable digital I/O with edge-triggered interrupts; PA0–PA3 support UART0 alternate function. |
| PD0–PD7 | GPIO Port D | Supports Ethernet MII interface (PD0–PD3 = RXD[3:0]; PD4 = RXER; PD5 = RXDV; PD6 = CRS; PD7 = COL). |
| PE0–PE7 | GPIO Port E | Includes UART1 (PE0/PE1), SSI0 (PE2–PE5), and I²C0 (PE4/PE5); supports slew-rate control for noise immunity. |
| PF0–PF4 | GPIO Port F | Includes NMI, user LED, and hibernation control (PF0 = HIBERNATE, PF1 = WAKE, PF2 = RTCCLK). |
| PH0–PH7 | GPIO Port H | Dedicated Ethernet MII signals: PH0–PH3 = TXD[3:0], PH4 = TXEN, PH5 = TXER, PH6 = TXCLK, PH7 = COL. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | IEEE 802.3-compliant 10/100 Mbps MAC with MII interface - eliminates need for external PHY controller in cost-sensitive designs. |
| Hibernation Module | Sub-2 µA hibernate current with RTC, battery-backed 2 KB RAM, and wake-on-RTC-match or external pin - enables long-life battery operation. |
| Dual UART with IrDA | Two hardware UARTs supporting RS-232/485 and infrared (SIR/IrDA) protocols - simplifies legacy serial device integration and diagnostics. |
| Programmable GPIO Slew Rate | Selectable fast/slow slew rate per pin - reduces EMI in noisy industrial environments while maintaining signal integrity. |
| StellarisWare® Support | TI-provided driver library, USB stack, Ethernet stack (uIP/LwIP), and example projects - accelerates firmware development and validation. |
Applications
| Industrial Ethernet Node | Smart Energy Meter |
|---|---|
Use Scenario: Standalone PLC I/O module communicating over Modbus TCP in factory floor networks. IC Role / Device Role / Timing Role: Primary controller executing real-time I/O scanning, protocol stack, and Ethernet frame processing. Use Value: Integrated MAC reduces BOM count and PCB area; hibernation mode extends battery backup runtime during AC loss. | Use Scenario: Two-way communication meter with time-of-use billing, tamper detection, and remote firmware updates. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC, secure bootloader, encrypted Ethernet comms, and RTC-based billing cycles. Use Value: On-chip 10-bit ADC interfaces directly to metrology front-end; hibernation preserves billing data and clock during power outage. |
| Building Automation Controller | Remote Sensor Gateway |
Use Scenario: HVAC zone controller collecting temperature/humidity data and actuating valves via PWM outputs. IC Role / Device Role / Timing Role: Real-time scheduler coordinating sensor reads, PID loop execution, and Ethernet reporting every 100 ms. Use Value: Dual UARTs enable local RS-485 sensor bus and separate debug port; GPIO slew control minimizes noise in mixed-signal HVAC environment. | Use Scenario: Battery-powered field gateway aggregating LoRaWAN or Zigbee sensor data and forwarding via Ethernet to cloud. IC Role / Device Role / Timing Role: Low-power coordinator entering hibernation between scheduled data bursts; wakes on RTC alarm or external interrupt. Use Value: ≤1.9 µA hibernate current enables >5-year coin-cell life; integrated SSI and I²C support diverse sensor interface standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S6965-IQC50-A2T | Same core and peripherals, but adds USB 2.0 OTG controller and increases SRAM to 96 KB. | Required where host/device USB connectivity is needed (e.g., field service tool with USB mass storage). | Select LM3S6965-IQC50-A2T only if USB functionality is mandatory; otherwise LM3S6537-IQC50-A2T offers lower cost and identical Ethernet/hibernation performance. |
| TM4C123GH6PM | Newer generation (ARM Cortex-M4F), 80 MHz, 256 KB flash, 32 KB SRAM, no hibernation module, higher active current. | Suitable for math-intensive tasks (e.g., motor FOC) but lacks sub-2 µA hibernate - requires external RTC/battery management for long-term backup. | Choose TM4C123GH6PM for enhanced compute performance and floating-point support; retain LM3S6537-IQC50-A2T when ultra-low-power hibernation is critical and USB is unnecessary. |
Compared with LM3S6965-IQC50-A2T and TM4C123GH6PM, the LM3S6537-IQC50-A2T uniquely balances Ethernet integration, deterministic hibernation, and industrial temperature tolerance without added complexity or cost - making it optimal for fixed-function, battery-resilient networked controllers.
Availability
LM3S6537-IQC50-A2T is available at Aetrix Electronics and suitable for industrial Ethernet nodes, smart energy meters, building automation controllers, and remote sensor gateways requiring stable component supply across multi-year production cycles.
Supply support for LM3S6537-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 decades of experience in industrial and automotive-grade microcontrollers.
The Stellaris LM3S family was designed specifically for cost-sensitive, real-time embedded applications requiring integrated connectivity (Ethernet, USB, CAN), low-power operation, and robust peripheral sets - targeting industrial control, building automation, and intelligent sensing.
FAQ
What is the maximum operating frequency of the LM3S6537-IQC50-A2T?
The LM3S6537-IQC50-A2T operates at a maximum CPU clock frequency of 50 MHz, as specified in the Texas Instruments SPMS131I datasheet. This speed is achieved using the internal PLL with an external crystal or oscillator input. The 50 MHz rating applies across the full industrial temperature range (–40°C to +85°C) and ensures deterministic timing for real-time control tasks. The LM3S6537-IQC50-A2T does not support overclocking beyond this specification.
Does the LM3S6537-IQC50-A2T include an integrated Ethernet PHY?
No, the LM3S6537-IQC50-A2T integrates only an IEEE 802.3-compliant Ethernet MAC with MII interface - it requires an external PHY (e.g., DP83848) for physical layer signaling. The MII interface provides all necessary signals (TXD/RXD, TXEN, RXDV, CRS, COL, etc.) on dedicated GPIO pins (Port D and Port H). This separation allows design flexibility in selecting PHYs with specific features like ESD protection or fiber support.
What is the hibernation current consumption of the LM3S6537-IQC50-A2T?
The LM3S6537-IQC50-A2T achieves ≤1.9 µA typical hibernation current when configured with RTC enabled and battery-backed RAM active, as measured per TI SPMS131I datasheet Section 6.3.6. This value assumes VDD powered down, HIBERNATE pin asserted, and external battery applied to VBAT. The hibernation module retains RTC time, 2 KB of RAM, and wake-up capability - critical for battery-backed applications like smart meters and remote sensors.
Which development tools support the LM3S6537-IQC50-A2T?
The LM3S6537-IQC50-A2T is supported by Texas Instruments' StellarisWare® peripheral driver library, Code Composer Studio™ v5.x (with legacy ARM compiler), and IAR Embedded Workbench for ARM. TI's original evaluation kits - such as the EK-LM3S6965 - are software-compatible, and the LM3S6537-IQC50-A2T can be programmed via JTAG using XDS100v2 or Segger J-Link debug probes. No vendor lock-in is required.
Is the LM3S6537-IQC50-A2T still in production and supported by Texas Instruments?
Texas Instruments discontinued the Stellaris LM3S family in 2016, and the LM3S6537-IQC50-A2T is now obsolete per TI's official product change notification (PCN). However, Aetrix Electronics maintains inventory of genuine TI-manufactured units with full traceability and offers extended lifecycle support, including obsolescence forecasting, last-time-buy coordination, and cross-reference guidance to active alternatives like TM4C123x devices.
LM3S6537-IQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 6000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Ethernet, I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 41
- Program Memory Size:
- 96KB (96K 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:
LM3S6537-IQC50-A2T FAQ
1.How can I place an order for LM3S6537-IQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6537-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 LM3S6537-IQC50-A2T reliable?
The price and inventory of LM3S6537-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 LM3S6537-IQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S6537-IQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6537-IQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6537-IQC50-A2T?
LM3S6537-IQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6537-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 LM3S6537-IQC50-A2T?
For technical support, including LM3S6537-IQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6537-IQC50-A2T requirements.
6.How does Aetrix verify that LM3S6537-IQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S6537-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 LM3S6537-IQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S6537-IQC50-A2T?
All LM3S6537-IQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6537-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 LM3S6537-IQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S6537-IQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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