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Texas Instruments LM3S308-IQN25-C2T
- Part No.:
- LM3S308-IQN25-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S308-IQN25-C2T.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,186
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Product details
Overview
LM3S308-IQN25-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, integrated ADC (12-bit, 1 MSPS), dual UARTs, I²C, SSI, and PWM-capable timers. It operates at 50 MHz and supports industrial temperature range (–40°C to +85°C) in a 100-pin LQFP package. Used in motor control, industrial automation, and embedded HMI systems.
For engineers reviewing the LM3S308-IQN25-C2T datasheet, LM3S308-IQN25-C2T pinout, LM3S308-IQN25-C2T application, or LM3S308-IQN25-C2T equivalent, key selection criteria include flash/SRAM size, peripheral mix (UART/SSI/I²C), ADC resolution and sampling rate, PWM timer capability, and industrial-grade thermal performance.
Technical Context
The LM3S308-IQN25-C2T implements the ARM Cortex-M3 core with NVIC, SysTick, MPU, and debug support via JTAG. Its system-level integration includes on-chip LDO regulator, clock gating for power management, and reset controller with brown-out detection.
Peripherals are memory-mapped and accessible via APB bus; ADC supports hardware averaging and internal temperature sensor; UARTs include FIFOs and programmable baud-rate generation; SSI supports master/slave SPI modes with frame formatting control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic real-time execution with Thumb-2 instruction set. |
| Flash Memory | 256 KB on-chip flash with 1K erase sectors - sufficient for complex firmware with bootloader and field-upgrade capability. |
| SRAM | 32 KB on-chip SRAM - supports real-time data buffering, stack/heap allocation, and interrupt service routine context storage. |
| ADC | 12-bit, 1 MSPS, 8-channel SAR ADC with hardware averaging - suitable for precision analog sensing in motor current or temperature monitoring. |
| Timers | Four 16/32-bit GPTMs with PWM, one 32-bit RTC - enables multi-channel motor phase timing, pulse-width modulation, and wall-clock timekeeping. |
| Communication | Dual UARTs (FIFO, auto-baud), I²C master/slave, SSI (SPI-compatible) - supports serial diagnostics, sensor networks, and display interfaces. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without external thermal derating. |
| Supply Voltage | 2.25 V to 2.75 V - compatible with single 2.5 V rail or regulated 2.5 V LDO output. |
Pinout & Package
Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital core (VDD), analog (VDDA), and clock domain (VDDC) supplies - require separate decoupling for noise isolation. |
| GND, GNDA, GNDC | Ground returns | Analog ground (GNDA) must be isolated from digital ground to preserve ADC accuracy. |
| PA0–PA7, PB0–PB7, etc. | GPIO with alternate functions | Each port supports UART/SSI/I²C/ADC/PWM mapping - flexible peripheral routing reduces PCB layer count. |
| U0RX/U0TX, U1RX/U1TX | UART serial I/O | Dedicated full-duplex UART pins with programmable drive strength - enable robust RS-232/RS-485 interface with external transceivers. |
| SSI0CLK/SSI0FSS/SSI0RX/SSI0TX | SSI interface signals | Hardware-controlled SPI master/slave interface - offloads CPU during flash or sensor communication. |
| ADC0AIN0–ADC0AIN7 | Analog input channels | Eight single-ended or four differential ADC inputs - support direct connection to resistive sensors or op-amp outputs. |
| JTAG TCK/TMS/TDI/TDO/nTRST | JTAG debug interface | Standard 5-pin JTAG for programming and real-time debugging - compatible with TI XDS100v3 and third-party emulators. |
Key Features
| Feature | Design Value |
|---|---|
| ARM Cortex-M3 core with NVIC | Enables low-latency interrupt response (<12 cycles) and priority-based nested interrupt handling for real-time motor control loops. |
| On-chip LDO regulator | Generates internal 1.25 V core voltage from 2.25–2.75 V supply - eliminates need for external core regulator and simplifies power design. |
| Hardware ADC averaging | Configurable 2x–64x oversampling and averaging - improves effective resolution to >13 bits without software overhead. |
| GPIO alternate function remapping | Per-pin assignment of UART/SSI/I²C/ADC/PWM functions - allows optimal signal routing and avoids trace congestion on dense PCBs. |
| Multiple low-power sleep modes | Deep-sleep mode draws <10 µA with RTC active - extends battery life in portable industrial monitors or wireless sensor nodes. |
| Internal temperature sensor | Monitors die temperature with ±5°C accuracy - enables thermal throttling or safety shutdown in enclosed motor drives. |
Applications
| Industrial Motor Control | Factory Automation I/O Module |
|---|---|
Use Scenario: Closed-loop control of BLDC motors using PWM outputs, current sensing via ADC, and position feedback via quadrature encoder inputs. IC Role / Device Role / Timing Role: Real-time execution engine managing commutation timing, fault detection, and communication with PLC over UART. Use Value: Integrated PWM timers and ADC with hardware averaging reduce external component count and improve current measurement stability under EMI. | Use Scenario: Remote digital I/O expansion node collecting sensor data and executing local logic in distributed control systems. IC Role / Device Role / Timing Role: Protocol gateway translating Modbus RTU (via UART) to local GPIO/ADC reads and discrete actuator control. Use Value: Dual UARTs allow simultaneous host communication and daisy-chained device management; 32 KB SRAM buffers protocol payloads reliably. |
| Embedded Human-Machine Interface | Thermal Monitoring System |
Use Scenario: Touch-enabled panel with LCD driver interface, button scanning, and status LED control in HVAC controllers. IC Role / Device Role / Timing Role: Main controller handling GUI rendering, touch debounce, and serial display updates via SSI or UART. Use Value: Flexible GPIO remapping enables direct matrix keypad scanning; SSI supports fast pixel data transfer to monochrome OLED displays. | Use Scenario: Standalone temperature logger with thermistor inputs, nonvolatile logging, and USB-to-UART bridge for data retrieval. IC Role / Device Role / Timing Role: Analog front-end processor acquiring and conditioning temperature readings, storing timestamps in SRAM, and formatting logs for serial export. Use Value: Internal temperature sensor validates ambient reading integrity; 256 KB flash stores months of timestamped log entries without external memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Tiva C TM4C123GH6PM | Successor part with 80 MHz Cortex-M4F core, FPU, 256 KB flash, 32 KB SRAM, same 100-pin LQFP package. | Supports floating-point math and enhanced DSP instructions - better suited for advanced motor algorithms or audio processing. | Select when upgrading legacy LM3S designs requiring higher compute throughput or FPU acceleration. |
| STM32F103VCT6 | ARM Cortex-M3 at 72 MHz, 256 KB flash, 48 KB SRAM, 12-bit ADC (1 MSPS), but no integrated LDO and different peripheral register layout. | Lacks on-chip LDO - requires external 1.8 V or 3.3 V core regulator; UART/SSI/I²C peripherals use different initialization sequences. | Choose for cost-sensitive designs where external power management is already present and firmware porting effort is acceptable. |
Compared with TM4C123GH6PM and STM32F103VCT6, the LM3S308-IQN25-C2T offers proven industrial reliability, integrated LDO simplification, and mature StellarisWare driver support - ideal for stable, long-lifecycle deployments where upgrade path or ecosystem compatibility is secondary to qualification continuity.
Availability
LM3S308-IQN25-C2T is available at Aetrix Electronics and suitable for industrial motor control, factory automation I/O modules, and embedded HMI applications requiring stable component supply and long-term manufacturing continuity.
Supply support for LM3S308-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive markets.
The Stellaris LM3S family was designed specifically for cost-sensitive, real-time embedded applications demanding high peripheral integration, low power, and industrial temperature operation - targeting motor control, PLCs, and intelligent sensors.
FAQ
What is the maximum operating frequency of the LM3S308-IQN25-C2T?
The LM3S308-IQN25-C2T operates at a maximum system clock frequency of 50 MHz. This is achieved using the internal PLL with an external crystal or oscillator input, and the core runs at this frequency without overclocking or derating. The LM3S308-IQN25-C2T datasheet specifies timing parameters and AC characteristics validated up to 50 MHz across the full industrial temperature range.
Does the LM3S308-IQN25-C2T include an integrated voltage regulator?
Yes, the LM3S308-IQN25-C2T integrates an on-chip low-dropout (LDO) regulator that generates the 1.25 V core voltage from a single 2.25 V to 2.75 V supply. This eliminates the need for an external core regulator and simplifies board-level power design. The LDO characteristics - including load regulation, line regulation, and dropout voltage - are specified in Section 18.1.3 of the LM3S308-IQN25-C2T datasheet.
How many ADC channels does the LM3S308-IQN25-C2T support, and what is its resolution?
The LM3S308-IQN25-C2T features a single 12-bit successive approximation register (SAR) ADC with eight input channels (ADC0AIN0–ADC0AIN7). It supports both single-ended and differential sampling modes, and includes hardware sample averaging (2x–64x) to enhance effective resolution. The ADC achieves 1 MSPS sampling rate with full 12-bit linearity across the industrial temperature range.
Is the LM3S308-IQN25-C2T pin-compatible with other Stellaris devices?
No, the LM3S308-IQN25-C2T is not universally pin-compatible across the Stellaris family. While it shares the 100-pin LQFP package with some variants (e.g., LM3S3748), signal assignments differ significantly - especially for analog inputs, PWM outputs, and peripheral alternate functions. Pin compatibility must be verified per specific variant using the LM3S308-IQN25-C2T pin diagram and signal tables in Sections 15 and 16 of its datasheet.
What debug interface does the LM3S308-IQN25-C2T support?
The LM3S308-IQN25-C2T supports standard 5-pin JTAG (TCK, TMS, TDI, TDO, nTRST) for programming, boundary scan, and real-time debugging. It is compatible with TI's XDS100v3-class emulators and third-party JTAG tools supporting ARM CoreSight compliant debug access. SWD is not supported - only JTAG is implemented on the LM3S308-IQN25-C2T.
LM3S308-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:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 25MHz
- Connectivity:
- I2C, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 28
- 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 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S308-IQN25-C2T FAQ
1.How can I place an order for LM3S308-IQN25-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S308-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 LM3S308-IQN25-C2T reliable?
The price and inventory of LM3S308-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 LM3S308-IQN25-C2T is usually 5 days.
3.What payment methods are accepted for LM3S308-IQN25-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S308-IQN25-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S308-IQN25-C2T?
LM3S308-IQN25-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S308-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 LM3S308-IQN25-C2T?
For technical support, including LM3S308-IQN25-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S308-IQN25-C2T requirements.
6.How does Aetrix verify that LM3S308-IQN25-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S308-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 LM3S308-IQN25-C2T meets industry standards.
7.What is the process for return or replacement of LM3S308-IQN25-C2T?
All LM3S308-IQN25-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S308-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 LM3S308-IQN25-C2T part is unused and in its original packaging.
Return procedure for LM3S308-IQN25-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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