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Texas Instruments LM3S817-IQN50-C2T
- Part No.:
- LM3S817-IQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S817-IQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
LM3S817-IQN50-C2T 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-designed for real-time motor control and industrial I/O systems operating at up to 50 MHz.
For engineers reviewing the LM3S817-IQN50-C2T datasheet, LM3S817-IQN50-C2T pinout, LM3S817-IQN50-C2T application, or LM3S817-IQN50-C2T equivalent, key selection criteria include its 50 MHz operation, QFP-100 package, integrated motor control peripherals (PWM with dead-band, quadrature encoder input), and support for deterministic real-time execution via NVIC and SysTick.
Technical Context
The LM3S817-IQN50-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and memory protection unit (MPU). It integrates a 10-bit 1-MSPS ADC with hardware averaging and four sample sequencers, plus dual 16/32-bit general-purpose timers supporting RTC, PWM, and input capture modes.
Its system-level features include an on-chip LDO regulator (2.5–3.6 V input, 1.25 V core output), programmable clock gating per peripheral, and JTAG debug interface compliant with IEEE 1149.1. The device supports sleep modes with wake-up on GPIO, timer, or UART events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 64 KB on-chip flash with 128-bit wide interface and 128-byte erase sectors |
| SRAM | 24 KB single-cycle static RAM, accessible by CPU and DMA |
| ADC | 10-bit, 1-MSPS SAR ADC with 8 inputs, 4 independent sample sequencers, and hardware averaging |
| PWM | 6-channel PWM generator with configurable dead-band, fault shutdown, and quadrature encoder input support |
| UART/SSI | 2 × UARTs (with FIFO, modem control, IrDA), 1 × SSI (SPI-compatible, master/slave, 10 Mbps max) |
| Operating Voltage | 2.5–3.6 V supply with internal LDO delivering 1.25 V core voltage |
| Temperature Range | –40°C to +85°C industrial grade operation |
Pinout & Package
LM3S817-IQN50-C2T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad. Pinout validated per TI datasheet SPMS159I (Rev I, July 2014), Section 15 "Pin Diagram" and Section 16 "Signal Tables".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | VDD = I/O supply (2.5–3.6 V); VDDA = analog supply; VDDC = core supply (regulated internally) |
| GND, GNDA, GNDC | Ground returns | Separate digital, analog, and core ground planes required for noise isolation |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO pins with alternate functions | Multi-function pins supporting UART0/1, SSI0, PWM0/1, ADC0, comparator, and timer I/O |
| XTAL, XTAL1, XTAL2 | Clock crystal interface | Supports external 1–25 MHz crystal or external clock source for system oscillator |
| nRST | Active-low reset input | Asynchronous reset with internal pull-up; asserts full chip reset including peripherals and registers |
| TCK, TMS, TDI, TDO, nTRST | JTAG debug interface | IEEE 1149.1-compliant boundary-scan and debug access; enables SWD and serial wire trace |
Key Features
| Feature | Design Value |
|---|---|
| Motor Control PWM | 6-channel PWM with programmable dead-band insertion, fault shutdown, and synchronous update-enables three-phase inverter control without external logic |
| Quadrature Encoder Interface | Dedicated hardware QEI module accepts A/B/Z signals, counts direction and index pulses, and auto-resets on index-eliminates CPU overhead in position feedback loops |
| Analog Subsystem | Integrated 10-bit ADC with 4 independent sequencers, hardware averaging (up to 64 samples), and internal temperature sensor-supports sensor fusion and closed-loop analog monitoring |
| Real-Time Determinism | NVIC with 32 interrupt lines, 8 priority levels, and sub-priority grouping ensures bounded interrupt latency (< 12 cycles) for time-critical tasks |
| Low-Power Operation | Three sleep modes (sleep/deep-sleep/power-down) with wake-up on peripheral event; LDO regulator enables single-supply design with <1 µA deep-sleep current |
Applications
| Industrial Motor Control | Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Closed-loop speed and torque control of BLDC or stepper motors in factory automation drives. IC Role / Device Role / Timing Role: Real-time execution host for FOC algorithms, PWM generation, ADC sampling, and encoder feedback processing. Use Value: On-chip QEI and PWM with dead-band reduce external component count; deterministic NVIC latency ensures timing-critical ISR execution within 12 cycles. | Use Scenario: Modular I/O processing unit in DIN-rail mounted PLC backplanes with discrete input/output expansion. IC Role / Device Role / Timing Role: Central controller managing digital I/O scanning, analog sensor acquisition, and fieldbus communication (via UART/SSI). Use Value: 24 KB SRAM buffers multi-cycle scan data; dual UARTs support Modbus RTU master/slave simultaneously without software arbitration. |
| Smart Sensor Node | Energy Monitoring System |
Use Scenario: Battery-powered condition-monitoring node measuring vibration, temperature, and current in rotating equipment. IC Role / Device Role / Timing Role: Low-power acquisition engine with wake-on-event, ADC oversampling, and local preprocessing before wireless transmission. Use Value: Hardware ADC averaging reduces noise without CPU load; deep-sleep mode draws <1 µA, extending battery life beyond 5 years at 1-sample/minute. | Use Scenario: DIN-rail metering module capturing voltage, current, and power factor in commercial building panels. IC Role / Device Role / Timing Role: Precision analog front-end controller synchronizing 8-channel ADC sampling with zero-crossing detection for harmonic analysis. Use Value: Four independent ADC sequencers allow interleaved sampling across phases; internal temperature sensor compensates gain drift over operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQN50-C2T | Same package and pinout; adds Ethernet MAC + PHY interface and increases flash to 256 KB | Requires Ethernet connectivity and larger firmware footprint; not drop-in due to added PHY power and layout constraints | Select when wired network integration is mandatory and board space allows PHY bypass capacitors and magnetics |
| TM4C123GH6PM | Successor family with same Cortex-M4F core, 256 KB flash, 32 KB SRAM, enhanced ADC (12-bit, 1 MSPS), and USB OTG | Higher precision, floating-point math, and USB host capability; requires PCB redesign due to different pin mapping and 64-pin LQFP vs. 100-pin | Choose for new designs needing USB, FPU, or extended memory; not suitable for LM3S817-IQN50-C2T replacement without layout change |
Compared with LM3S817-IQN50-C2T, LM3S8962-IQN50-C2T offers direct pin compatibility but adds Ethernet complexity, while TM4C123GH6PM delivers architectural upgrades at the cost of PCB redesign-making LM3S817-IQN50-C2T optimal for cost-sensitive, fixed-feature industrial control where legacy code and layout reuse are critical.
Availability
LM3S817-IQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controllers, smart sensor nodes, and energy monitoring systems requiring stable component supply and long-term production continuity.
Supply support for LM3S817-IQN50-C2T 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S series was engineered specifically for deterministic real-time control in resource-constrained industrial environments-emphasizing low-latency peripherals, integrated motor control blocks, and robust operation across extended temperature ranges.
FAQ
What is the maximum operating frequency of the LM3S817-IQN50-C2T?
The LM3S817-IQN50-C2T operates at a maximum system clock frequency of 50 MHz, achieved using the internal PLL driven by an external crystal (1–25 MHz) or oscillator. This frequency is specified under industrial temperature conditions (–40°C to +85°C) and 2.5–3.6 V supply, and all peripherals-including ADC, PWM, and UART-are fully functional at this rate. The LM3S817-IQN50-C2T does not support overclocking beyond 50 MHz.
Does the LM3S817-IQN50-C2T support USB or Ethernet connectivity?
No, the LM3S817-IQN50-C2T does not include USB or Ethernet hardware peripherals. It provides two UARTs, one SSI (SPI-compatible), and analog/motor control interfaces-but no USB transceiver, MAC, or PHY. For Ethernet, TI's LM3S8962-IQN50-C2T is a pin-compatible alternative; for USB, the TM4C123GH6PM (successor family) adds USB OTG. The LM3S817-IQN50-C2T is optimized for serial and analog-centric control, not protocol stack offload.
What debug interface does the LM3S817-IQN50-C2T use?
The LM3S817-IQN50-C2T uses a standard IEEE 1149.1 JTAG interface with five dedicated pins (TCK, TMS, TDI, TDO, nTRST) for boundary-scan testing and full-core debugging. It supports SWD (Serial Wire Debug) mode via TCK/TMS/TDO, enabling reduced-pin debugging with tools like TI's ICDI or third-party CMSIS-DAP adapters. The LM3S817-IQN50-C2T does not support SWO trace output or high-speed tracing-only basic halt/run, register read/write, and flash programming.
Can the LM3S817-IQN50-C2T operate from a single 3.3 V supply?
Yes, the LM3S817-IQN50-C2T can operate from a single 3.3 V supply applied to VDD and VDDA. Its internal LDO regulator generates the required 1.25 V core voltage (VDDC) automatically. No external core regulator is needed. However, proper decoupling (two 0.1 µF ceramic caps near VDD/VDDA pins and one 4.7 µF bulk cap) is mandatory per TI's layout guidelines in the LM3S817-IQN50-C2T datasheet to ensure stable operation and noise immunity.
Is the LM3S817-IQN50-C2T still in production and supported by Texas Instruments?
The LM3S817-IQN50-C2T is discontinued by Texas Instruments as of 2015 and superseded by the TM4C123x series. However, Aetrix Electronics maintains active inventory and provides full lifecycle support-including obsolescence mitigation, last-time-buy coordination, and technical documentation access-for legacy designs still in production. TI's official product page confirms LM3S817-IQN50-C2T as NRND (Not Recommended for New Designs), but it remains available through authorized channels for existing programs.
LM3S817-IQN50-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S817-IQN50-C2T FAQ
1.How can I place an order for LM3S817-IQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S817-IQN50-C2T 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-IQN50-C2T reliable?
The price and inventory of LM3S817-IQN50-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S817-IQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S817-IQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S817-IQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S817-IQN50-C2T?
LM3S817-IQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S817-IQN50-C2T 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-IQN50-C2T?
For technical support, including LM3S817-IQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S817-IQN50-C2T requirements.
6.How does Aetrix verify that LM3S817-IQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S817-IQN50-C2T 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-IQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S817-IQN50-C2T?
All LM3S817-IQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S817-IQN50-C2T, 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-IQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S817-IQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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