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Texas Instruments LM3S315-IQN25-C2T
- Part No.:
- LM3S315-IQN25-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S315-IQN25-C2T.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
LM3S315-IQN25-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 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 LM3S315-IQN25-C2T datasheet, LM3S315-IQN25-C2T pinout, LM3S315-IQN25-C2T application, or LM3S315-IQN25-C2T equivalent, key selection criteria include its 50 MHz CPU clock, 256 KB on-chip flash with hardware write protection, 32 KB SRAM, integrated 10-bit ADC with temperature sensor, and support for deterministic real-time interrupt handling via NVIC.
Technical Context
The LM3S315-IQN25-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It executes from on-chip flash with zero-wait-state access up to 50 MHz and supports sleep modes with wake-on-interrupt capability.
Peripherals include two UARTs with FIFOs and modem control signals, one SSI interface supporting SPI/Microwire, eight PWM generator blocks with dead-band generation, and a 10-bit 8-channel ADC with hardware averaging and internal temperature sensor-enabling closed-loop motor control and sensor-based embedded automation without external timing or signal conditioning ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 50 MHz max operation |
| Flash Memory | 256 KB on-chip, with hardware write/erase protection and 1K sector erase granularity |
| SRAM | 32 KB on-chip, zero-wait-state access at full CPU speed |
| ADC | 10-bit, 8-channel SAR ADC with 1 MSPS sample rate, hardware averaging, and internal temperature sensor |
| PWM | 8 PWM generator blocks, each supporting independent 16-bit timers, dead-band insertion, and fault shutdown |
| UARTs | 2 UART modules with 16-byte FIFOs, programmable baud rates, and full modem control (RTS/CTS/DSR/DTR) |
| Package | 100-pin LQFP (14 mm × 14 mm), lead-free, RoHS-compliant |
Pinout & Package
LM3S315-IQN25-C2T is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are multiplexed across GPIO, peripherals, and system control signals-including dedicated JTAG debug pins (TCK/TMS/TDI/TDO/nTRST), power domains (VDD/VDDA/VSS/VSSA), and reset (nRST).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| nRST | Active-low reset input | Asynchronous reset assertion clears CPU state, peripherals, and registers; requires external pull-up |
| TCK | JTAG clock input | Synchronizes JTAG TAP controller state transitions; driven by external debugger at ≤10 MHz |
| TMS | JTAG mode select input | Controls JTAG state machine progression; sampled on TCK rising edge |
| TDI | JTAG data input | Serial input to instruction/data registers during JTAG scan operations |
| TDO | JTAG data output | Serial output from instruction/data registers; high-impedance when not selected |
| VDD | Digital supply | 3.3 V ±5% main digital power rail; decoupling required per datasheet layout guidelines |
| VDDA | Analog supply | 3.3 V ±5% analog domain supply; isolated from VDD with separate decoupling |
| GPIO[0–7] | General-purpose I/O | Configurable as inputs/outputs with slew-rate control, weak pull-up/down, and interrupt capability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Comparator | Two comparators with programmable reference voltage and interrupt output for threshold detection |
| Hardware Flash Protection | Read/write/erase lock bits per 1 KB sector prevent unauthorized firmware access or overwrite |
| Dual UART with Modem Control | Full RTS/CTS/DSR/DTR signaling enables robust RS-232/RS-485 communication without external transceivers |
| Real-Time Interrupt Latency | Fixed 12-cycle NVIC response time for highest-priority interrupts ensures deterministic motor control timing |
| Temperature Sensor Integration | On-die 10-bit ADC channel calibrated to ±3°C accuracy over –40°C to +85°C for system thermal monitoring |
Applications
| Industrial Motor Control | Smart 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 execution of FOC algorithms, PWM waveform generation with dead-band, and ADC sampling of current/voltage/temperature. Use Value: Eliminates need for external PWM generator or ADC; deterministic 12-cycle interrupt latency ensures precise commutation timing. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity (via I²C sensor), and ambient light. IC Role / Device Role / Timing Role: System controller with integrated ADC for analog sensors, UART for debug logging, and low-power sleep mode management. Use Value: On-chip temperature sensor and 32 KB SRAM enable local data buffering and wake-on-threshold without external components. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Equipment Interface |
Use Scenario: DIN-rail mounted I/O expansion module accepting 24 V DC digital inputs and driving relay outputs. IC Role / Device Role / Timing Role: Isolation interface controller managing opto-coupled inputs, GPIO-driven relays, and UART-based Modbus RTU communication. Use Value: Dual UARTs with hardware flow control ensure reliable Modbus packet integrity at 115.2 kbps over noisy factory floors. | Use Scenario: Front-end signal conditioning and control unit in portable ultrasound probe handling transducer bias and echo digitization triggers. IC Role / Device Role / Timing Role: Timing coordinator generating synchronized PWM bursts for transducer excitation and triggering external ADC capture windows. Use Value: Precise 50 MHz clock domain and PWM dead-band control enable repeatable acoustic pulse generation with sub-microsecond jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S328-IQN25-C2T | Same package and core, but includes CAN controller and lacks analog comparator | Better suited for automotive body control networks requiring CAN FD messaging | Select when CAN bus connectivity is mandatory and analog comparator is unnecessary |
| TM4C123GH6PM | Successor family with 80 MHz Cortex-M4F, FPU, enhanced ADC (12-bit, 1MSPS), and USB OTG | Enables floating-point math for advanced filtering and host-class USB device functionality | Choose for new designs needing higher performance, USB, or floating-point acceleration |
Compared with LM3S315-IQN25-C2T, LM3S328-IQN25-C2T trades analog comparator capability for CAN interface-making it unsuitable for sensor-threshold applications but viable for networked control. TM4C123GH6PM offers architectural upgrades including FPU and USB, but requires PCB redesign due to different pinout and power sequencing.
Availability
LM3S315-IQN25-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and medical diagnostic equipment interfaces requiring stable component supply and long-term lifecycle support.
Supply support for LM3S315-IQN25-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 wireless technologies with over 90 years of innovation in industrial and automotive electronics.
The Stellaris LM3S series was designed as TI's first ARM-based microcontroller family targeting cost-sensitive, real-time embedded applications in industrial automation, building control, and medical devices-prioritizing peripheral integration, deterministic interrupt response, and code density.
FAQ
What is the maximum operating frequency of the LM3S315-IQN25-C2T?
The LM3S315-IQN25-C2T operates at a maximum CPU clock frequency of 50 MHz. This speed is achieved using the on-chip PLL with an external crystal or oscillator input, and all peripherals-including flash memory-are fully functional at this rate without wait states. The LM3S315-IQN25-C2T maintains deterministic timing across all interrupt latencies and peripheral transactions at this frequency.
Does the LM3S315-IQN25-C2T include an integrated temperature sensor?
Yes, the LM3S315-IQN25-C2T integrates a calibrated on-die temperature sensor connected to ADC channel 7. It provides ±3°C accuracy across the –40°C to +85°C industrial temperature range and requires no external components. The LM3S315-IQN25-C2T firmware can read this value directly via the ADC sequencer without additional signal conditioning.
What debug interface does the LM3S315-IQN25-C2T support?
The LM3S315-IQN25-C2T supports IEEE 1149.1 JTAG boundary-scan debugging with five dedicated pins: TCK, TMS, TDI, TDO, and nTRST. It is compatible with standard ARM CoreSight debug tools and TI's ICDI-based debuggers. The LM3S315-IQN25-C2T does not support SWD (Serial Wire Debug); JTAG is the only supported debug protocol.
Is the LM3S315-IQN25-C2T pin-compatible with other LM3S devices?
No, the LM3S315-IQN25-C2T is not pin-compatible with other LM3S variants-even within the same 100-pin LQFP package-due to differing peripheral mappings and GPIO alternate function assignments. For example, UART1 signals appear on different pins in LM3S328-IQN25-C2T. Migration requires PCB layout revision and firmware adaptation for pinmux configuration.
What power supply requirements does the LM3S315-IQN25-C2T have?
The LM3S315-IQN25-C2T requires two independent 3.3 V ±5% supplies: VDD for digital logic and VDDA for analog circuitry (ADC, comparator, LDO). Separate decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) are required per supply rail, and VDDA must be powered before or simultaneously with VDD. The LM3S315-IQN25-C2T includes an internal LDO regulator for VDDA generation if only a single 3.3 V source is available.
LM3S315-IQN25-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 25MHz
- Connectivity:
- Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 3.6V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S315-IQN25-C2T FAQ
1.How can I place an order for LM3S315-IQN25-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S315-IQN25-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 LM3S315-IQN25-C2T reliable?
The price and inventory of LM3S315-IQN25-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S315-IQN25-C2T is usually 5 days.
3.What payment methods are accepted for LM3S315-IQN25-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S315-IQN25-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S315-IQN25-C2T?
LM3S315-IQN25-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S315-IQN25-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 LM3S315-IQN25-C2T?
For technical support, including LM3S315-IQN25-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S315-IQN25-C2T requirements.
6.How does Aetrix verify that LM3S315-IQN25-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S315-IQN25-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 LM3S315-IQN25-C2T meets industry standards.
7.What is the process for return or replacement of LM3S315-IQN25-C2T?
All LM3S315-IQN25-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S315-IQN25-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 LM3S315-IQN25-C2T part is unused and in its original packaging.
Return procedure for LM3S315-IQN25-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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