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Texas Instruments LM3S308-IGZ25-C2
- Part No.:
- LM3S308-IGZ25-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LM3S308-IGZ25-C2.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,658
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Product details
Overview
LM3S308-IGZ25-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, I²C, SSI, and PWM-capable timers. It operates at up to 25 MHz and supports industrial temperature range (–40°C to +85°C) in a 100-pin LQFP package. It targets motor control and embedded automation systems requiring real-time analog acquisition and serial connectivity.
For engineers reviewing the LM3S308-IGZ25-C2 datasheet, LM3S308-IGZ25-C2 pinout, LM3S308-IGZ25-C2 application, or LM3S308-IGZ25-C2 equivalent, key selection considerations include its 25 MHz max CPU frequency, on-chip 10-bit ADC with hardware averaging, dual UART support with FIFOs, integrated watchdog and system timer, and compatibility with StellarisWare® peripheral driver library.
Technical Context
The LM3S308-IGZ25-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC for nested interrupt handling, and SysTick timer for OS tick generation. Its memory subsystem includes 64 KB of single-cycle flash and 24 KB of SRAM, both accessible via AHB bus.
Peripherals are organized into APB-based modules: two UARTs with 16-byte FIFOs, one I²C master/slave interface supporting standard/fast modes, one SSI controller compatible with SPI/Microwire, eight-channel 10-bit ADC with four sample sequencers, and six general-purpose timers (including RTC and PWM modes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, supports deterministic interrupt latency and bit-band addressing. |
| Max Clock Frequency | 25 MHz - defines maximum real-time execution speed and peripheral timing margins for UART baud rates, ADC sampling, and PWM resolution. |
| Flash Memory | 64 KB - stores firmware with error detection, supports in-application programming (IAP) and flash protection bits. |
| SRAM | 24 KB - provides runtime data storage, stack space, and buffer memory for communication peripherals and ADC sample buffers. |
| ADC Resolution & Channels | 10-bit, 8-channel - enables precise analog sensor interfacing; four independent sample sequencers allow triggered, burst, or continuous acquisition. |
| UART Interfaces | 2 × UART - each with 16-byte TX/RX FIFOs, programmable baud rate generator, and modem control signals for RS-232/RS-485 bridging. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without external thermal management or derating. |
Pinout & Package
LM3S308-IGZ25-C2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments support multiplexed GPIO, dedicated peripheral functions, and power/ground distribution optimized for noise immunity in mixed-signal applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital core (VDDC), analog (VDDA), and I/O (VDD) rails require separate decoupling; internal LDO regulates VDDC from VDD. |
| GND, GNDA, GNDC | Ground returns | Analog ground (GNDA) must be isolated from digital ground (GNDC) and connected at single point to minimize ADC noise coupling. |
| PA0–PA7, PB0–PB7, etc. | GPIO with alternate functions | Each port supports up to 8 alternate peripheral mappings (e.g., UART0TX on PA0, SSI0CLK on PA2); configurable pull-up/down and drive strength. |
| USB0VBUS, USB0ID | USB interface signals | Not present on LM3S308-IGZ25-C2 - this variant lacks USB PHY and associated pins per datasheet Section 15 (Pin Diagram) and Table 16.1. |
| OSC0, OSC1 | External crystal oscillator inputs | Supports 1–25 MHz crystal or external clock source; internal PLL generates system clock up to 25 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10-bit ADC with hardware averaging | Reduces software overhead for noise suppression; supports up to 1 MSPS sampling across 8 channels with sequencer-triggered acquisition. |
| Dual UARTs with 16-byte FIFOs | Enables robust asynchronous communication with minimal CPU intervention; supports automatic flow control and break detection. |
| ARM Cortex-M3 with NVIC and SysTick | Provides deterministic interrupt response (<12 cycles), priority-based nesting, and scalable real-time OS tick generation. |
| On-chip 64 KB flash with protection bits | Allows secure firmware updates and prevents accidental overwrite of bootloader or critical configuration sectors. |
| Industrial-grade temperature range | Validated operation from –40°C to +85°C ensures reliability in factory automation, HVAC, and motor drive enclosures without forced cooling. |
Applications
| Motor Control Interface | Industrial Sensor Hub |
|---|---|
Use Scenario: Real-time closed-loop control of BLDC motors using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Central controller executing FOC algorithms, acquiring position/speed analog signals, and generating synchronized 3-phase PWM outputs. Use Value: Integrated 10-bit ADC with hardware averaging enables accurate current sensing; dual UARTs support host command interface and debug telemetry without external logic. | Use Scenario: Aggregating temperature, pressure, and humidity readings from multiple analog and digital sensors in a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: Data concentrator managing time-stamped sensor acquisition, local preprocessing, and protocol translation to Modbus RTU over RS-485. Use Value: Eight ADC channels and I²C/SSI interfaces allow direct connection to diverse sensors; 24 KB SRAM accommodates local buffering and firmware stack depth for multitasking. |
| Embedded HMI Controller | Power Supply Monitor |
Use Scenario: Driving a monochrome graphical LCD and responding to keypad/touch input in a front-panel interface for industrial equipment. IC Role / Device Role / Timing Role: User interface processor handling display refresh, button debouncing, and status LED control while maintaining communication with main system MCU. Use Value: GPIO flexibility supports direct segment driving or SPI-based display interface; watchdog timer ensures fail-safe recovery from UI lockup. | Use Scenario: Monitoring rail voltages, fan speeds, and thermal sensors in an AC/DC power supply unit for telecom infrastructure. IC Role / Device Role / Timing Role: Dedicated supervisor IC performing periodic ADC measurements, threshold comparison, and fault logging via UART to host controller. Use Value: Internal temperature sensor and 8-channel ADC eliminate need for external monitoring ICs; low-power sleep modes extend uptime during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S310-IGZ25-C2 | Same core and peripherals but with 96 KB flash and 32 KB SRAM; identical pinout and package. | Supports larger firmware images and deeper data buffers; suitable when code size exceeds 64 KB or extended logging is required. | Select LM3S310-IGZ25-C2 only if additional flash/SRAM is needed; otherwise LM3S308-IGZ25-C2 offers optimal cost/performance balance. |
| TM4C123GH6PM | Successor family with Cortex-M4F core, 80 MHz max frequency, enhanced ADC (12-bit, 2MSPS), and USB OTG; 64-pin LQFP (not pin-compatible). | Enables floating-point math, higher-resolution sensing, and USB device/host capability; requires PCB redesign due to different pin count and layout. | Choose TM4C123GH6PM for new designs needing performance headroom or USB; retain LM3S308-IGZ25-C2 for legacy compatibility and cost-sensitive volume production. |
Compared with LM3S310-IGZ25-C2 and TM4C123GH6PM, the LM3S308-IGZ25-C2 delivers verified industrial real-time control within strict BOM cost constraints, offering sufficient memory and analog capability for established motor and sensor applications without requiring layout changes or toolchain migration.
Availability
LM3S308-IGZ25-C2 is available at Aetrix Electronics and suitable for motor control systems, industrial sensor nodes, embedded HMIs, and power supply supervision requiring stable component supply and long-term industrial qualification.
Supply support for LM3S308-IGZ25-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 specializing in analog, embedded processing, and connectivity technologies, with decades of industrial and automotive qualification expertise.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded applications demanding integrated analog peripherals, deterministic interrupt response, and broad ecosystem support through StellarisWare® drivers and evaluation tools.
FAQ
What is the maximum operating frequency of the LM3S308-IGZ25-C2?
The LM3S308-IGZ25-C2 operates at a maximum system clock frequency of 25 MHz, derived from its internal PLL locked to an external crystal or oscillator input. This frequency governs CPU execution speed, peripheral timing (e.g., UART baud rates), and ADC sampling rate limits. The device does not support overclocking beyond this rated specification, and all electrical characteristics in the datasheet assume operation at or below 25 MHz.
Does the LM3S308-IGZ25-C2 include USB functionality?
No, the LM3S308-IGZ25-C2 does not include USB hardware. As confirmed in the official Texas Instruments datasheet (Section 15, Pin Diagram and Table 16.1), this variant omits USB0VBUS, USB0ID, and related PHY pins. USB capability is present only in higher-tier Stellaris devices such as the LM3S811 or LM3S9B92. For USB-enabled designs, engineers should consider the TM4C123GH6PM as a functional successor.
What are the supported ADC features on the LM3S308-IGZ25-C2?
The LM3S308-IGZ25-C2 integrates a 10-bit successive-approximation ADC with eight input channels, four independent sample sequencers, and hardware sample averaging (up to 64 samples). It supports single-ended and differential input modes, internal temperature sensor readout, and programmable trigger sources including processor, timer, and analog comparator events - all documented in Section 10 of the datasheet.
Is the LM3S308-IGZ25-C2 pin-compatible with other LM3S devices?
The LM3S308-IGZ25-C2 shares the same 100-pin LQFP package and pinout with the LM3S310-IGZ25-C2 and LM3S316-IGZ25-C2, enabling drop-in replacement where flash/SRAM requirements align. However, it is not pin-compatible with 64-pin or 48-pin LM3S variants (e.g., LM3S811), nor with TM4C series devices, which use different pin counts and signal allocations.
What development tools support the LM3S308-IGZ25-C2?
The LM3S308-IGZ25-C2 is fully supported by Texas Instruments' StellarisWare® Peripheral Driver Library, Code Composer Studio™ v5/v6, and IAR Embedded Workbench for ARM. Evaluation is enabled via the LM3S811 Evaluation Kit (EK-LM3S811), which shares the same JTAG interface and core architecture - though users must verify peripheral register mapping matches the LM3S308-IGZ25-C2 datasheet.
LM3S308-IGZ25-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-VFQFN Exposed Pad
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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-IGZ25-C2 FAQ
1.How can I place an order for LM3S308-IGZ25-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S308-IGZ25-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 LM3S308-IGZ25-C2 reliable?
The price and inventory of LM3S308-IGZ25-C2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S308-IGZ25-C2 is usually 5 days.
3.What payment methods are accepted for LM3S308-IGZ25-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S308-IGZ25-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S308-IGZ25-C2?
LM3S308-IGZ25-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S308-IGZ25-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 LM3S308-IGZ25-C2?
For technical support, including LM3S308-IGZ25-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S308-IGZ25-C2 requirements.
6.How does Aetrix verify that LM3S308-IGZ25-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S308-IGZ25-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 LM3S308-IGZ25-C2 meets industry standards.
7.What is the process for return or replacement of LM3S308-IGZ25-C2?
All LM3S308-IGZ25-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S308-IGZ25-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 LM3S308-IGZ25-C2 part is unused and in its original packaging.
Return procedure for LM3S308-IGZ25-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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