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Texas Instruments LM3S817-EQN50-C2
- Part No.:
- LM3S817-EQN50-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S817-EQN50-C2.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
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Product details
Overview
LM3S817-EQN50-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (10-bit, 8-channel), dual UARTs, SSI, PWM, and analog comparator. It operates at up to 50 MHz and supports industrial motor control, sensor interface, and embedded HMI applications.
For engineers reviewing the LM3S817-EQN50-C2 datasheet, LM3S817-EQN50-C2 pinout, LM3S817-EQN50-C2 application, or LM3S817-EQN50-C2 equivalent, key selection criteria include its 50 MHz CPU clock, QFP-100 package with 80 GPIOs, integrated analog peripherals, and support for real-time deterministic execution in resource-constrained embedded systems.
Technical Context
The LM3S817-EQN50-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC with 32 interrupt lines, and SysTick timer. It integrates a 10-bit 1-MSPS ADC with hardware averaging and four sample sequencers.
Its peripheral set includes two UARTs with FIFOs and modem control, one SSI port supporting Freescale SPI and MICROWIRE protocols, six PWM generator blocks with dead-band generation, and an analog comparator with internal voltage reference. Clocking is managed via PLL-based system clock up to 50 MHz from internal or external sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, deterministic interrupt latency |
| Max Clock Speed | 50 MHz - enables real-time control loops with sub-10 µs ISR response |
| Flash Memory | 64 KB - sufficient for bootloader + application firmware with field-upgrade capability |
| SRAM | 24 KB - supports multiple task stacks, buffers for UART/SSI, and ADC data acquisition |
| ADC Resolution | 10-bit, 1-MSPS - resolves 1 mV steps on 1 V full-scale input for precision sensor interfacing |
| GPIO Count | 80 pins - configurable as digital I/O, UART/SSI/PWM functions, or analog inputs |
| Operating Voltage | 3.0–3.6 V - compatible with standard industrial 3.3 V supply rails and LDO regulation |
| Temperature Range | –40°C to +85°C - qualified for extended industrial environments without derating |
Pinout & Package
LM3S817-EQN50-C2 is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, 14 × 14 mm body size, and exposed thermal pad for enhanced heat dissipation in continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power Supply Inputs | Digital core (VDDC), analog (VDDA), and I/O (VDD) domains require independent 3.3 V filtering |
| GND, GNDA, GNDC | Ground Returns | Analog (GNDA), core (GNDC), and I/O (GND) grounds must be star-connected to minimize noise coupling |
| PD0–PD7, PE0–PE7, PF0–PF4, etc. | General-Purpose I/O | 80 total GPIOs support alternate functions including UART0/1, SSI0, PWM0/1, and ADC0 inputs |
| USB0VBUS, USB0ID, USB0DM, USB0DP | USB 2.0 Full-Speed Interface | On-chip USB PHY supports device-mode operation; VBUS sensing enables plug-detection |
| OSC0, OSC1 | Crystal Oscillator Inputs | Supports 4–25 MHz crystal or external clock source for precise system timing |
| nRST | Active-Low Reset Input | Asynchronous reset with internal pull-up; accepts 3.3 V logic level |
| JTAG TCK/TMS/TDI/TDO/nTRST | Debug Interface Signals | Standard 5-pin JTAG interface for programming and real-time debugging via SWD-compatible tools |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Comparator | Two comparators with programmable hysteresis and internal 1.65 V reference-enables zero-crossing detection and overvoltage protection without external components |
| Dual UART with Modem Control | UART0 and UART1 each support RTS/CTS flow control and 16-byte FIFOs-reduces CPU overhead in serial telemetry and configuration interfaces |
| PWM Generator with Dead-Band | Six PWM outputs with configurable dead-time insertion-supports three-phase motor gate drive with shoot-through prevention |
| Hardware ADC Averaging | Up to 64-sample hardware averaging per conversion-improves effective resolution to ~12 bits for noisy industrial sensor signals |
| Memory Protection Unit (MPU) | Configurable memory regions with privilege/access control-enables safe multitasking and firmware partitioning in safety-aware designs |
| System Control Block (SCB) | Includes SysTick timer, NVIC, and system exception handling-simplifies RTOS integration and deterministic scheduling |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers and pump drives using Hall-effect feedback. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, PWM waveform generation, and ADC sampling synchronized to commutation events. Use Value: Deterministic 50 MHz Cortex-M3 core and hardware dead-band ensure precise phase timing and prevent MOSFET shoot-through. | Use Scenario: Battery-powered environmental monitoring node measuring temperature, humidity, and pressure with local processing. IC Role / Device Role / Timing Role: Sensor signal conditioning via ADC and comparator, low-power sleep/wake scheduling, and UART-based data reporting. Use Value: Integrated 10-bit ADC with hardware averaging delivers stable readings under EMI; 24 KB SRAM stores calibration coefficients and history buffers. |
| Human-Machine Interface (HMI) | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Touch-button panel with LED status indicators and serial communication to host controller. IC Role / Device Role / Timing Role: GPIO scanning, PWM dimming control, UART command parsing, and real-time button debouncing. Use Value: 80 GPIOs support direct matrix keypad interface; dual UARTs enable simultaneous debug and host communication. | Use Scenario: DIN-rail mounted I/O expansion module converting discrete 24 V inputs to Modbus RTU over RS-485. IC Role / Device Role / Timing Role: Digital input filtering, isolated output switching control, and protocol stack execution with deterministic timing. Use Value: On-chip analog comparator monitors input thresholds; SSI interface connects to isolated RS-485 transceivers with minimal BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQC50-A2 | Same Cortex-M3 core, 256 KB flash, 32 KB SRAM, adds CAN controller and Ethernet MAC | Targeted at networked industrial nodes requiring CAN bus or Ethernet connectivity | Select when CAN or Ethernet interface is required; otherwise LM3S817-EQN50-C2 offers lower cost and smaller footprint |
| TM4C123GH6PM | Successor family with same pinout, 256 KB flash, 32 KB SRAM, enhanced ADC (12-bit), and USB OTG | Designed for long-term production with extended lifecycle and TI's newer StellarisWare SDK support | Preferred for new designs needing longer availability and upgraded peripherals; LM3S817-EQN50-C2 remains viable for legacy compatibility |
Compared with LM3S817-EQN50-C2, LM3S8962-IQC50-A2 adds CAN/Ethernet at higher cost and power, while TM4C123GH6PM provides backward-compatible upgrade path with richer analog and USB capabilities-both require validation of firmware migration effort.
Availability
LM3S817-EQN50-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, HMI panels, and PLC I/O modules requiring stable component supply and long-lifecycle support.
Supply support for LM3S817-EQN50-C2 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 with emphasis on reliability, power efficiency, and industrial-grade qualification.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications demanding high integration of analog, control, and communication peripherals in a single chip.
FAQ
What is the maximum operating frequency of the LM3S817-EQN50-C2?
The LM3S817-EQN50-C2 operates at a maximum system clock frequency of 50 MHz, achieved via its internal PLL that multiplies the input crystal or oscillator frequency. This speed is specified across the full industrial temperature range (–40°C to +85°C) and 3.0–3.6 V supply, enabling deterministic real-time performance for motor control and sensor processing tasks within the LM3S817-EQN50-C2.
Does the LM3S817-EQN50-C2 include an integrated USB interface?
Yes, the LM3S817-EQN50-C2 integrates a full-speed (12 Mbps) USB 2.0 device-mode controller with on-chip PHY. It supports USB device enumeration and data transfer using the USB0DM/USB0DP pins, VBUS sensing on USB0VBUS, and ID pin detection on USB0ID-enabling HID, CDC, or custom class implementations without external transceivers in the LM3S817-EQN50-C2.
How many analog-to-digital converter (ADC) channels does the LM3S817-EQN50-C2 support?
The LM3S817-EQN50-C2 features a single 10-bit ADC module with eight external input channels (ADC0[7:0]) and one internal temperature sensor channel. It supports hardware sample averaging across up to 64 conversions per sequence, improving effective resolution and noise immunity-this ADC architecture is fully documented in the LM3S817-EQN50-C2 datasheet Section 10.
Is the LM3S817-EQN50-C2 pin-compatible with other Stellaris devices?
No, the LM3S817-EQN50-C2 is not universally pin-compatible across the Stellaris family. While it shares the 100-pin LQFP package with some variants like LM3S8962, differences in peripheral mapping (e.g., missing CAN in LM3S817-EQN50-C2) and signal assignments mean PCB layout changes are required for substitution. Always verify pin function tables in the LM3S817-EQN50-C2 datasheet before replacement.
What debug interface does the LM3S817-EQN50-C2 support?
The LM3S817-EQN50-C2 supports standard 5-pin JTAG debugging via TCK, TMS, TDI, TDO, and nTRST signals. It also implements Serial Wire Debug (SWD) mode using TCK and TMS pins, enabling compatibility with modern debug probes such as TI's XDS100v3 and third-party CMSIS-DAP adapters-full debug functionality is accessible without additional hardware in the LM3S817-EQN50-C2.
LM3S817-EQN50-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 3.6V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S817-EQN50-C2 FAQ
1.How can I place an order for LM3S817-EQN50-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S817-EQN50-C2 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 LM3S817-EQN50-C2 reliable?
The price and inventory of LM3S817-EQN50-C2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S817-EQN50-C2 is usually 5 days.
3.What payment methods are accepted for LM3S817-EQN50-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S817-EQN50-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S817-EQN50-C2?
LM3S817-EQN50-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S817-EQN50-C2 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 LM3S817-EQN50-C2?
For technical support, including LM3S817-EQN50-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S817-EQN50-C2 requirements.
6.How does Aetrix verify that LM3S817-EQN50-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S817-EQN50-C2 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 LM3S817-EQN50-C2 meets industry standards.
7.What is the process for return or replacement of LM3S817-EQN50-C2?
All LM3S817-EQN50-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S817-EQN50-C2, 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 LM3S817-EQN50-C2 part is unused and in its original packaging.
Return procedure for LM3S817-EQN50-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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