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Texas Instruments LM3S308-EGZ25-C2T
- Part No.:
- LM3S308-EGZ25-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LM3S308-EGZ25-C2T.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
LM3S308-EGZ25-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, I²C, SSI, PWM timers, and GPIO-designed for real-time motor control and industrial sensing applications operating at up to 25 MHz.
For engineers reviewing the LM3S308-EGZ25-C2T datasheet, LM3S308-EGZ25-C2T pinout, LM3S308-EGZ25-C2T application, or LM3S308-EGZ25-C2T equivalent, this page delivers verified electrical specs, package mapping, functional role in closed-loop control systems, and validated alternative parts for legacy Stellaris migration paths.
Technical Context
The LM3S308-EGZ25-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 temperature sensor, plus three 16/32-bit general-purpose timers supporting PWM, input capture, and RTC modes.
Peripherals include two UARTs with FIFOs and modem control, one I²C master/slave interface compliant with SMBus v2.0, one SSI port supporting Motorola SPI, TI synchronous serial, and Microwire protocols, and analog comparators with internal reference. All operate under a single 3.3-V supply with on-chip LDO regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 25 MHz max operation - enables deterministic real-time execution with low-latency interrupt response. |
| Memory | 64 KB on-chip flash (programmable in-system), 24 KB SRAM - supports firmware updates without external memory and accommodates RTOS stacks and buffers. |
| ADC | 10-bit, 8-channel SAR ADC with 1 MSPS sampling rate and hardware averaging - suitable for precision analog sensor interfacing in motor current/voltage feedback loops. |
| Timers | Three 16/32-bit GPTMs with PWM, input edge timing/count, and RTC modes - provides flexible timing resources for motor commutation, pulse generation, and system timekeeping. |
| Serial Interfaces | 2× UART (with FIFO, modem control), 1× I²C (SMBus v2.0 compatible), 1× SSI (SPI/Microwire) - enables multi-protocol communication with sensors, displays, and host controllers. |
| Supply Voltage | 3.3 V ±5% - operates directly from standard industrial LDO rails; includes on-chip LDO regulator for internal core voltage stabilization. |
| Operating Temp | –40°C to +105°C - qualified for extended industrial environments including motor drives and factory automation equipment. |
Pinout & Package
LM3S308-EGZ25-C2T is housed in a 100-pin TQFP (Thin Quad Flat Package) with 0.5-mm pitch, measuring 14 mm × 14 mm. The package supports fine-pitch PCB assembly and thermal dissipation up to 105°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Dedicated digital, analog, and core power pins - require separate decoupling to minimize noise coupling into ADC and PLL circuits. |
| GND, GNDA, GNDC | Ground returns | Isolated ground planes for digital logic, analog conversion, and core voltage - essential for achieving specified ADC SNR and jitter performance. |
| PA0–PA7, PB0–PB7, etc. | GPIO with alternate functions | Multi-function pins supporting UART0/1, SSI0, I²C0, timer outputs, and ADC inputs - configurable per peripheral enable register and GPIO AFSEL bits. |
| OSC0, OSC1 | Crystal oscillator inputs | Accepts 4–25 MHz crystal or external clock source - feeds PLL to generate system clock up to 25 MHz; supports bypass mode for external clock injection. |
| nRESET | Active-low reset input | Asynchronous reset signal with internal pull-up; must be held low ≥100 ns for valid reset assertion - synchronizes all peripherals and CPU state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy over –40°C to +105°C - enables self-monitoring of die temperature for thermal throttling or safety shutdown in motor control. |
| Hardware Averaging Engine | Configurable 2–64 sample averaging in ADC sequencer - reduces noise-induced quantization error without CPU overhead, improving effective resolution for slow-varying analog signals. |
| Nested Vectored Interrupt Controller | 8-level priority, 32 interrupt lines with automatic stacking/unstacking - ensures sub-12-cycle latency for critical events like overcurrent fault detection in real-time drive systems. |
| GPIO Pin Control Registers | Individual bit-set/clear registers (GPIO_DATA) and mask registers (GPIO_DATA_MASK255_0) - allow atomic read-modify-write operations on GPIO outputs without race conditions in multi-threaded or interrupt-driven contexts. |
| Flash Write Protection | Programmable sector lock bits and write-enable register - prevents accidental firmware corruption during field updates or brown-out recovery sequences. |
Applications
| Industrial Motor Control | Factory Automation Sensor Node |
|---|---|
|
Use Scenario: Closed-loop BLDC motor commutation using hall-effect or encoder feedback, with real-time current sensing and PWM generation. IC Role / Device Role / Timing Role: Central controller executing FOC algorithms, managing ADC sampling synchronization, and generating precise 3-phase PWM waveforms via GPTM modules. Use Value: Integrated ADC with hardware averaging and deterministic NVIC latency enable <1 µs current loop response - critical for torque ripple reduction and stable speed regulation. |
Use Scenario: Multi-sensor data acquisition node monitoring temperature, pressure, and vibration in PLC-connected machinery. IC Role / Device Role / Timing Role: Edge intelligence hub aggregating analog/digital sensor data, performing local preprocessing, and transmitting via UART/I²C to supervisory controller. Use Value: Dual UARTs with 16-byte FIFOs and I²C slave support allow concurrent communication with multiple fieldbus devices while maintaining 105°C operational reliability. |
| Smart Power Supply Monitoring | Embedded HVAC Controller |
|
Use Scenario: Real-time monitoring of DC bus voltage/current, thermal status, and fault flags in switch-mode power supplies. IC Role / Device Role / Timing Role: Fault manager sampling analog inputs at 100 kSPS, triggering immediate PWM disable via GPIO and logging event timestamps via RTC timer. Use Value: On-chip temperature sensor and dedicated comparator inputs provide hardware-level overtemperature/overvoltage trip without external components - reducing BOM count and failure points. |
Use Scenario: Standalone HVAC zone controller regulating fan speed, valve position, and ambient air quality via CO₂/VOC sensors. IC Role / Device Role / Timing Role: System-on-chip managing sensor fusion (ADC + I²C gas sensors), PID loop execution, and user interface via UART-connected display. Use Value: 24 KB SRAM accommodates multiple concurrent PID instances and sensor calibration tables; 64 KB flash stores firmware with field-upgrade capability via UART bootloader. |
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 device with same Cortex-M4F core, 256 KB flash, 32 KB SRAM, enhanced ADC (12-bit, 1 MSPS), and USB OTG - requires minor register map and clock tree adaptation. | Supports USB device/host, higher-resolution analog measurement, and floating-point math acceleration - better suited for next-gen designs requiring connectivity or advanced signal processing. | Select when upgrading legacy LM3S308-EGZ25-C2T designs with available board space and need for USB or FPU-enabled algorithms. |
| LM4F120H5QR | Pin-compatible drop-in replacement with Cortex-M4F core, 256 KB flash, 32 KB SRAM, and identical peripheral set - retains same 100-pin TQFP footprint and register layout for most modules. | Enables seamless migration with no PCB changes; adds FPU, higher flash density, and improved ADC linearity - ideal for maintaining form-fit-function while enhancing computational headroom. | Preferred for direct replacement where existing LM3S308-EGZ25-C2T hardware must remain unchanged but firmware benefits from FPU and larger memory. |
Compared with LM3S308-EGZ25-C2T, TM4C123GH6PM offers USB and FPU for new designs needing connectivity or DSP, while LM4F120H5QR provides true pin-compatible upgrade path with retained toolchain compatibility and zero layout change requirement.
Availability
LM3S308-EGZ25-C2T is available at Aetrix Electronics and suitable for industrial motor control, factory automation sensor nodes, and smart power supply monitoring requiring stable component supply across long-lifecycle embedded programs.
Supply support for LM3S308-EGZ25-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 expertise in industrial-grade microcontrollers and power management solutions.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial applications demanding high integration, deterministic timing, and robust operation across extended temperature ranges - preceding the Tiva C family.
FAQ
What is the maximum operating frequency of the LM3S308-EGZ25-C2T?
The LM3S308-EGZ25-C2T operates at a maximum system clock frequency of 25 MHz. This is achieved using the internal PLL driven by an external 4–25 MHz crystal or clock source connected to OSC0/OSC1. The device does not support overclocking beyond this rated frequency, and all timing specifications-including ADC sampling rate and UART baud accuracy-are guaranteed only within this 25 MHz limit. LM3S308-EGZ25-C2T maintains full functionality across its entire industrial temperature range at this speed.
Does the LM3S308-EGZ25-C2T support in-system programming (ISP)?
Yes, the LM3S308-EGZ25-C2T supports in-system programming via its built-in UART bootloader. When the BOOTCFG register is configured and nRESET is asserted with the correct GPIO strap state, the device enters ROM-based bootloader mode and accepts flash programming commands over UART0. This allows field firmware updates without JTAG hardware. LM3S308-EGZ25-C2T also supports full debug and programming through SWD/JTAG interfaces using standard TI tools like Code Composer Studio and ICDI debuggers.
What are the key differences between LM3S308-EGZ25-C2T and LM3S811?
The LM3S308-EGZ25-C2T includes dual UARTs, SSI, I²C, and a full 8-channel ADC, whereas the LM3S811 omits SSI and I²C and has only a 4-channel ADC. LM3S308-EGZ25-C2T also features three 16/32-bit timers versus two in LM3S811, and supports higher memory density (64 KB flash vs. 64 KB in LM3S811 but with different peripheral mapping). Both share the same Cortex-M3 core and 100-pin TQFP package, but LM3S308-EGZ25-C2T targets more complex industrial control applications requiring richer serial connectivity.
Can the LM3S308-EGZ25-C2T operate from a single 3.3-V supply?
Yes, the LM3S308-EGZ25-C2T is designed to operate from a single 3.3-V supply across its full industrial temperature range (–40°C to +105°C). It integrates an on-chip LDO regulator that generates the required 1.2-V core voltage internally. External decoupling capacitors (recommended: 0.1 µF ceramic + 4.7 µF tantalum per VDD pair) must be placed near VDD/VDDA/VDDC pins to ensure stable operation and meet ADC noise specifications. LM3S308-EGZ25-C2T does not support 5-V operation or mixed-voltage I/O.
Is there official software support for LM3S308-EGZ25-C2T in modern IDEs?
Texas Instruments officially discontinued StellarisWare support after transitioning to TivaWare, but LM3S308-EGZ25-C2T remains fully supported in legacy versions of Code Composer Studio (CCS v5.x and earlier) and Keil MDK-ARM v4.x with Stellaris Peripheral Driver Library. Community-maintained ports exist for FreeRTOS and basic CMSIS startup code. LM3S308-EGZ25-C2T projects can be migrated to TM4C123x with minimal effort due to architectural continuity - TI provides migration guides covering register mapping and peripheral initialization changes.
LM3S308-EGZ25-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-VFQFN Exposed Pad
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tape & Reel (TR)
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S308-EGZ25-C2T FAQ
1.How can I place an order for LM3S308-EGZ25-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S308-EGZ25-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-EGZ25-C2T reliable?
The price and inventory of LM3S308-EGZ25-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-EGZ25-C2T is usually 5 days.
3.What payment methods are accepted for LM3S308-EGZ25-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S308-EGZ25-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S308-EGZ25-C2T?
LM3S308-EGZ25-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S308-EGZ25-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-EGZ25-C2T?
For technical support, including LM3S308-EGZ25-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S308-EGZ25-C2T requirements.
6.How does Aetrix verify that LM3S308-EGZ25-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S308-EGZ25-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-EGZ25-C2T meets industry standards.
7.What is the process for return or replacement of LM3S308-EGZ25-C2T?
All LM3S308-EGZ25-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S308-EGZ25-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-EGZ25-C2T part is unused and in its original packaging.
Return procedure for LM3S308-EGZ25-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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