My Inquiry
My Account
Texas Instruments LM3S308-EQN25-C2
- Part No.:
- LM3S308-EQN25-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S308-EQN25-C2.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,262
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3S308-EQN25-C2 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 up to 50 MHz and targets real-time motor control and industrial sensor interfaces.
For engineers reviewing the LM3S308-EQN25-C2 datasheet, LM3S308-EQN25-C2 pinout, LM3S308-EQN25-C2 application, or LM3S308-EQN25-C2 equivalent, key selection criteria include flash/SRAM size, 12-bit ADC sampling rate, UART/SSI/I²C peripheral count, GPIO count with alternate functions, and QFN-25 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3S308-EQN25-C2 implements the ARM Cortex-M3 core with nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU). It integrates a 12-bit, 1 MSPS analog-to-digital converter with hardware averaging and temperature sensor support.
Peripherals include two UARTs with FIFOs, one I²C master/slave interface, one SSI port supporting Motorola, TI, and Microwire formats, and four 16/32-bit general-purpose timers with PWM, input capture, and RTC modes - all clocked from a configurable PLL-based system clock up to 50 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, supports Thumb-2 instruction set for code density and real-time determinism |
| Max Clock Speed | 50 MHz - enables deterministic 20 ns instruction cycle time for time-critical control loops |
| Flash Memory | 256 KB - sufficient for bootloader + application firmware with field-upgrade capability |
| SRAM | 32 KB - supports real-time data buffering, stack/heap allocation, and peripheral FIFO management |
| ADC Resolution & Rate | 12-bit, 1 MSPS - captures fast transients in motor current or voltage sensing without external oversampling |
| Package | QFN-25 (4×4 mm, 0.4 mm pitch) - surface-mount, thermally enhanced, suitable for compact industrial modules |
| Operating Voltage | 3.0 V to 3.6 V - compatible with standard industrial 3.3 V supply rails and LDO-regulated systems |
Pinout & Package
LM3S308-EQN25-C2 uses a 25-pin QFN package with exposed thermal pad. Pin functions are defined per TI SPMS068I datasheet Section 15 (Pin Diagram) and Section 16 (Signal Tables).
| 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 |
| GND, GNDA | Ground Returns | Analog and digital ground separation preserves 12-bit ADC accuracy and reduces switching noise injection |
| GPIOA[0–7], GPIOB[0–7], GPIOC[0–7], GPIOD[0–7], GPIOE[0–7] | Configurable I/O Banks | Up to 43 total GPIOs with programmable pull-up/down, slew rate, and open-drain options - many support peripheral alternate functions |
| UART0_RX / UART0_TX / UART1_RX / UART1_TX | Serial Interface Signals | Dual full-duplex UARTs with 16-byte FIFOs - enable simultaneous host debug and sensor telemetry communication |
| SSI0_CLK / SSI0_FSS / SSI0_RX / SSI0_TX | Synchronous Serial Interface | Single SSI port supporting SPI-compatible protocols - connects to digital sensors, DACs, or display controllers |
| I2C0_SDA / I2C0_SCL | I²C Bus Interface | Standard-mode (100 kHz) and fast-mode (400 kHz) I²C - interfaces with EEPROMs, temperature sensors, and PMICs |
| ADC0_IN0–ADC0_IN7 | Analog Input Channels | Eight single-ended or four differential ADC inputs - routed from dedicated pins, not shared with GPIO by default |
| RESET | Active-Low Reset Input | Asynchronous reset pin - requires external RC network or supervisor IC for reliable power-on and brownout recovery |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-Accelerated ADC Averaging | Up to 64-sample hardware averaging per conversion - improves effective resolution to >13 bits without CPU overhead |
| Integrated Temperature Sensor | On-die sensor calibrated to ±3°C accuracy - enables self-monitoring of die temperature for thermal throttling or safety shutdown |
| PWM-Capable Timers | Four 16/32-bit timers with PWM, capture, and quadrature encoder support - drive motor gate drivers or generate precise timing waveforms |
| Peripheral Multiplexing | Each GPIO pin supports up to 8 alternate functions - maximizes peripheral connectivity without increasing pin count |
| Memory Protection Unit (MPU) | Configurable region-based access control - isolates critical firmware sections from application-level faults in safety-aware designs |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors using current/voltage feedback and commutation timing. IC Role / Device Role / Timing Role: Real-time execution of FOC (Field-Oriented Control) algorithms with sub-microsecond timer resolution and synchronized ADC sampling. Use Value: Integrated 12-bit ADC with hardware averaging and PWM timers eliminates need for external signal conditioning and timing ICs. | Use Scenario: Battery-powered environmental monitoring node aggregating temperature, humidity, and pressure data. IC Role / Device Role / Timing Role: Low-power system controller managing sensor polling, data preprocessing, and UART/SSI-based wireless module interfacing. Use Value: 32 KB SRAM buffers multi-sensor readings; sleep modes reduce active current to <100 µA while retaining RAM state. |
| Programmable Logic Controller (PLC) I/O Module | Human-Machine Interface (HMI) Controller |
Use Scenario: DIN-rail mounted I/O expansion module with digital input filtering, relay driving, and Modbus RTU over UART. IC Role / Device Role / Timing Role: Deterministic peripheral handling of 16+ discrete inputs/outputs with configurable debounce and isolation interface control. Use Value: Dual UARTs support simultaneous Modbus RTU slave communication and local debug port; GPIOs tolerate 5 V tolerant inputs via external resistors. | Use Scenario: Embedded touchscreen controller for industrial panel PCs requiring button scanning, LED dimming, and status indicator management. IC Role / Device Role / Timing Role: Dedicated timer-driven PWM outputs for LED brightness control and GPIO-managed capacitive touch scan sequencing. Use Value: Hardware PWM with dead-band insertion prevents shoot-through in LED driver circuits; GPIO alternate functions simplify front-panel wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S318-EQN25-C2 | Same package and pinout; adds CAN controller and second I²C interface; identical flash/SRAM | Required for CANopen or DeviceNet fieldbus integration; unnecessary if only UART/SSI/I²C needed | Select LM3S318-EQN25-C2 only when CAN protocol support is mandatory; otherwise LM3S308-EQN25-C2 reduces BOM cost and software complexity |
| TM4C123GH6PM | Successor generation; 80 MHz Cortex-M4F core, 256 KB flash, 32 KB SRAM, same QFP-64 footprint but different pinout and voltage range (1.2 V core / 3.3 V I/O) | Enables floating-point math for advanced filtering; requires PCB redesign and updated power delivery | Choose TM4C123GH6PM for new designs needing higher performance or FPU; LM3S308-EQN25-C2 remains valid for legacy-compatible, cost-sensitive upgrades |
Compared with LM3S318-EQN25-C2, LM3S308-EQN25-C2 omits CAN but simplifies firmware and reduces component count; versus TM4C123GH6PM, it avoids migration effort and maintains proven stability in mature industrial deployments.
Availability
LM3S308-EQN25-C2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and HMI controllers requiring stable component supply and long-term production continuity.
Supply support for LM3S308-EQN25-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as an early-generation ARM Cortex-M3 MCU family targeting cost-sensitive, real-time industrial control applications with integrated analog and communication peripherals - before the TM4C transition.
FAQ
What is the maximum operating frequency of the LM3S308-EQN25-C2?
The LM3S308-EQN25-C2 operates at a maximum system clock frequency of 50 MHz, achieved via its internal PLL that multiplies the crystal or external clock source. This speed enables deterministic execution of real-time control tasks such as motor commutation and ADC-triggered PWM updates, and is validated across the full industrial temperature range (–40°C to +85°C) per TI SPMS068I datasheet Section 17.
Does the LM3S308-EQN25-C2 include an internal temperature sensor?
Yes, the LM3S308-EQN25-C2 integrates a factory-calibrated on-die temperature sensor accessible through ADC channel 8. Its output is linear across –40°C to +125°C with ±3°C accuracy, and requires no external components. The sensor is documented in Section 10.3.7 of the SPMS068I datasheet and can be read using standard ADC sequence configuration in the LM3S308-EQN25-C2 firmware.
How many UART interfaces does the LM3S308-EQN25-C2 support?
The LM3S308-EQN25-C2 supports two independent UART peripherals (UART0 and UART1), each with 16-byte transmit and receive FIFOs, programmable baud rates, and full modem control signals. Both UARTs are fully functional in the QFN-25 package, with dedicated pins assigned per Section 16.1 of the SPMS068I datasheet - enabling simultaneous debug logging and fieldbus communication in the LM3S308-EQN25-C2 design.
Is the LM3S308-EQN25-C2 pin-compatible with other Stellaris LM3S devices?
No, the LM3S308-EQN25-C2 is not universally pin-compatible across the LM3S family. While it shares the QFN-25 package with LM3S318-EQN25-C2 and LM3S362-EQN25-C2, pin assignments differ for peripherals like SSI and I²C. For example, SSI0 signals occupy different pins in LM3S318-EQN25-C2. Always verify signal mapping using TI's SPMS068I datasheet pin diagrams before substituting the LM3S308-EQN25-C2.
What debug interface does the LM3S308-EQN25-C2 use?
The LM3S308-EQN25-C2 uses a 4-pin JTAG interface (TCK, TMS, TDI, TDO) compliant with IEEE 1149.1, supporting full boundary-scan testing and real-time debugging via SWD-compatible tools. Debug access is enabled by default at reset and requires no firmware initialization. The JTAG pinout and timing specifications are detailed in Section 4 of the SPMS068I datasheet for the LM3S308-EQN25-C2.
LM3S308-EQN25-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- 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-EQN25-C2 FAQ
1.How can I place an order for LM3S308-EQN25-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S308-EQN25-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-EQN25-C2 reliable?
The price and inventory of LM3S308-EQN25-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-EQN25-C2 is usually 5 days.
3.What payment methods are accepted for LM3S308-EQN25-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S308-EQN25-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S308-EQN25-C2?
LM3S308-EQN25-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S308-EQN25-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-EQN25-C2?
For technical support, including LM3S308-EQN25-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S308-EQN25-C2 requirements.
6.How does Aetrix verify that LM3S308-EQN25-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S308-EQN25-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-EQN25-C2 meets industry standards.
7.What is the process for return or replacement of LM3S308-EQN25-C2?
All LM3S308-EQN25-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S308-EQN25-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-EQN25-C2 part is unused and in its original packaging.
Return procedure for LM3S308-EQN25-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3S308-EQN25-C2 Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
