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Texas Instruments LM3S6965-IQC50-A2T
- Part No.:
- LM3S6965-IQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S6965-IQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
LM3S6965-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. It serves as main system controller in networked industrial sensors and programmable logic controllers.
For engineers reviewing the LM3S6965-IQC50-A2T datasheet, LM3S6965-IQC50-A2T pinout, LM3S6965-IQC50-A2T application, or LM3S6965-IQC50-A2T equivalent, key selection criteria include Ethernet MAC integration, hibernation power management, 50 MHz real-time performance, and industrial-grade thermal reliability - all confirmed in TI's SPMS144I production data sheet dated July 15, 2014.
Technical Context
The LM3S6965-IQC50-A2T implements the ARM Cortex-M3 core with NVIC, SysTick, and MPU, enabling deterministic interrupt response and memory protection for safety-critical firmware. Its integrated Ethernet MAC supports 10/100 Mbps MII interface without external PHY control logic.
It features a dedicated hibernation module with battery-backed RTC, 2 KB hibernate RAM, and wake-on-RTC/external-pin capability - enabling sub-5 µA deep-sleep operation. Analog subsystem includes one 10-bit 1-MSPS ADC with four independent sample sequencers and internal temperature sensor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max - enables hard real-time deterministic execution with <8 µs interrupt latency. |
| Memory | 256 KB flash + 64 KB SRAM - sufficient for standalone Ethernet-enabled firmware with protocol stack and application logic. |
| Ethernet Interface | Integrated 10/100 Mbps MAC with MII - eliminates need for external MAC IC and reduces BOM count in wired industrial nodes. |
| ADC | 10-bit, 1 MSPS, 8-channel with 4 sequencers - supports concurrent analog monitoring of multiple sensors without CPU polling overhead. |
| Hibernate Current | ≤5 µA typical - enables multi-year battery life in remote sensor nodes using hibernation + RTC wake-up scheduling. |
| Operating Temp | –40°C to +85°C - qualified for uncontrolled industrial cabinet environments without forced cooling. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount reflow processes and manual inspection. |
Pinout & Package
LM3S6965-IQC50-A2T is housed in a 100-pin LQFP package (JEDEC MS-026AC) with exposed thermal pad. Pin functions are defined per TI SPMS144I datasheet Section 5.1 and GPIO register mapping in Section 8.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Differentiated domains: VDD (digital core), VDDA (analog), VDDC (clock system) - require separate filtering to prevent noise coupling into ADC/timing circuits. |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO banks | Multi-function pins supporting UART, SSI, I²C, PWM, and ADC inputs - configurable per peripheral enable registers without hardware muxing. |
| RMII_TXD0/RMII_TXD1 | Ethernet MAC transmit data | Direct connection to RMII-compliant PHY; no glue logic needed for 10/100 Mbps operation. |
| HIB_RTCCLK, HIB_WAKE | Hibernation module interface | Supports external crystal (32.768 kHz) for RTC and dedicated wake-up input - enables precise low-power scheduling independent of main clock domain. |
| nRST, nWAKE | Reset and wake control | Asynchronous reset assertion halts CPU and peripherals; nWAKE triggers exit from hibernate mode without full reset sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Ethernet MAC | Reduces system-level component count by eliminating discrete MAC IC; supports MII interface for direct PHY connection. |
| Hibernation Module with RTC | Enables ultra-low-power sleep states (<5 µA) with time-triggered wake-up - critical for battery-powered field devices with scheduled telemetry uploads. |
| Four Independent ADC Sequencers | Allows simultaneous sampling of up to 8 analog channels across different timing windows - eliminates software-driven channel switching delays. |
| ARM Cortex-M3 with MPU | Provides memory protection for partitioned firmware (e.g., bootloader vs. application), improving robustness in long-life embedded deployments. |
| Dual UART + SSI + I²C | Supports concurrent communication with legacy RS-232 devices (UART), SPI sensors (SSI), and I²C peripherals - simplifies multi-protocol gateway design. |
Applications
| Industrial Ethernet Sensor Node | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Remote temperature/pressure sensor with wired Ethernet backhaul in factory automation. IC Role / Device Role / Timing Role: Main system controller executing Modbus TCP stack, ADC sampling, and hibernation scheduling. Use Value: Integrated Ethernet MAC and hibernation module reduce bill-of-materials and extend battery life to >3 years on coin-cell power. | Use Scenario: DIN-rail mounted digital I/O expansion module with local logic execution and network supervision. IC Role / Device Role / Timing Role: Real-time I/O coordinator managing GPIO state changes, UART-based diagnostics, and Ethernet status reporting. Use Value: 50 MHz Cortex-M3 core ensures sub-millisecond response to input transitions while maintaining deterministic Modbus TCP latency. |
| Smart Energy Meter Interface | Building Automation Controller |
Use Scenario: Pulse-counting and voltage/current measurement interface between metering IC and楼宇网关. IC Role / Device Role / Timing Role: Analog front-end aggregator and protocol bridge converting metrology data to Ethernet packets. Use Value: 10-bit ADC with hardware averaging and four sequencers enable accurate RMS calculation across multiple phases without CPU intervention. | Use Scenario: HVAC zone controller collecting thermostat, damper, and occupancy sensor data for centralized BACnet/IP routing. IC Role / Device Role / Timing Role: Field-level decision engine performing local PID control and scheduled reporting over Ethernet. Use Value: Dual UARTs support legacy BACnet MS/TP and modern BACnet/IP simultaneously; hibernation extends uptime during utility outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQC50-A2T | Same core and peripherals but adds CAN controller and removes Ethernet MAC; identical 100-pin LQFP package. | Better suited for automotive body control modules requiring CAN bus; unsuitable where Ethernet connectivity is mandatory. | Select when CAN interface is required and Ethernet is unnecessary - same PCB footprint but different peripheral trade-off. |
| TM4C123GH6PM | Successor generation: Cortex-M4F core, 80 MHz, 256 KB flash, 32 KB SRAM, integrated PHY support, enhanced ADC (12-bit). | Supports floating-point math and higher-speed Ethernet; requires updated driver stack and layout due to different pinout and power sequencing. | Choose for new designs needing higher performance or FPU; not drop-in compatible - requires schematic and firmware revision. |
Compared with LM3S6965-IQC50-A2T, LM3S8962-IQC50-A2T trades Ethernet for CAN in identical packaging, while TM4C123GH6PM offers architectural upgrades (M4F, PHY support) at the cost of migration effort - making LM3S6965-IQC50-A2T optimal for legacy-stable, Ethernet-centric industrial nodes.
Availability
LM3S6965-IQC50-A2T is available at Aetrix Electronics and suitable for industrial Ethernet sensor nodes, PLC I/O modules, smart energy meter interfaces, and building automation controllers requiring stable component supply and long-term lifecycle assurance.
Supply support for LM3S6965-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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and wireless technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S family was designed as the first ARM Cortex-M3-based MCU line targeting cost-sensitive, real-time industrial control applications with integrated connectivity - LM3S6965-IQC50-A2T exemplifies this with Ethernet MAC and hibernation for wired edge nodes.
FAQ
What is the maximum operating frequency of the LM3S6965-IQC50-A2T?
The LM3S6965-IQC50-A2T operates at a maximum CPU frequency of 50 MHz, as specified in the SPMS144I production 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 is validated under worst-case voltage and process corners. LM3S6965-IQC50-A2T maintains deterministic interrupt latency and peripheral timing compliance at this frequency.
Does the LM3S6965-IQC50-A2T include an integrated Ethernet PHY?
No, the LM3S6965-IQC50-A2T integrates only the Ethernet MAC layer, not the physical layer (PHY). It provides an MII interface for connection to an external 10/100 Mbps PHY chip such as the DP83848 or LAN8720. The MAC supports full-duplex operation, IEEE 802.3 compliance, and hardware checksum offload. LM3S6965-IQC50-A2T requires external magnetics and PHY for complete Ethernet functionality.
What power modes does the LM3S6965-IQC50-A2T support?
The LM3S6965-IQC50-A2T supports Sleep, Deep-Sleep, and Hibernate modes. Hibernate mode draws ≤5 µA and retains 2 KB of RAM plus RTC operation using a backup battery or supercapacitor. Wake-up sources include RTC alarm, external GPIO, and HIB_WAKE pin. LM3S6965-IQC50-A2T exits Hibernate in <100 µs and restores full operation without firmware reload - critical for responsive low-power sensing.
How many ADC channels and what resolution does the LM3S6965-IQC50-A2T provide?
The LM3S6965-IQC50-A2T includes a single 10-bit successive-approximation ADC with eight input channels (AIN0–AIN7), capable of 1 million samples per second. It features four independent sample sequencers, each configurable for burst or periodic sampling, with hardware averaging up to 64 samples per conversion. LM3S6965-IQC50-A2T also integrates an internal temperature sensor accessible via AIN6.
Is the LM3S6965-IQC50-A2T pin-compatible with other Stellaris LM3S devices?
LM3S6965-IQC50-A2T is not universally pin-compatible across the LM3S family. While it shares the 100-pin LQFP package with LM3S8962-IQC50-A2T, pin functions differ significantly - especially for Ethernet vs. CAN signals. For example, RMII pins on LM3S6965-IQC50-A2T map to CANH/CANL on LM3S8962-IQC50-A2T. LM3S6965-IQC50-A2T requires dedicated layout; no PCB reuse is possible without signal-layer redesign.
LM3S6965-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:
- Active
- Programmable:
- Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Ethernet, I2C, IrDA, Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 42
- 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:
LM3S6965-IQC50-A2T FAQ
1.How can I place an order for LM3S6965-IQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S6965-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 LM3S6965-IQC50-A2T reliable?
The price and inventory of LM3S6965-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 LM3S6965-IQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S6965-IQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S6965-IQC50-A2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S6965-IQC50-A2T?
LM3S6965-IQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S6965-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 LM3S6965-IQC50-A2T?
For technical support, including LM3S6965-IQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S6965-IQC50-A2T requirements.
6.How does Aetrix verify that LM3S6965-IQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S6965-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 LM3S6965-IQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S6965-IQC50-A2T?
All LM3S6965-IQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S6965-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 LM3S6965-IQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S6965-IQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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