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Texas Instruments LM3S808-EQN50-C2T
- Part No.:
- LM3S808-EQN50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S808-EQN50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,837
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Product details
Overview
LM3S808-EQN50-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 analog comparator - designed for real-time motor control and industrial sensor interface applications.
For engineers reviewing the LM3S808-EQN50-C2T datasheet, LM3S808-EQN50-C2T pinout, LM3S808-EQN50-C2T application, or LM3S808-EQN50-C2T equivalent, key selection criteria include its 50 MHz CPU clock, QFP-100 package with 80 GPIOs, 3.3 V operation, integrated LDO regulator, and support for deterministic interrupt latency in closed-loop control systems.
Technical Context
The LM3S808-EQN50-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC supporting up to 48 interrupts with configurable priority, and SysTick timer for OS tick generation. It integrates a hardware memory protection unit (MPU) and supports sleep modes with wake-on-interrupt capability.
Peripherals include two 16/32-bit general-purpose timers with PWM and RTC modes, an 8-channel 10-bit ADC with hardware averaging and temperature sensor input, and three serial interfaces (UART×2, I²C, SSI) all with FIFO and programmable baud rate generators - enabling concurrent communication in resource-constrained embedded nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, executes Thumb-2 instructions at up to 50 MHz - enables deterministic real-time task scheduling. |
| Flash Memory | 64 KB on-chip flash with 128-bit wide interface and erase/program cycle endurance - sufficient for firmware + bootloader + parameter storage. |
| SRAM | 24 KB on-chip SRAM, zero-wait-state access at full speed - supports stack, heap, and real-time data buffers without external memory. |
| ADC | 10-bit SAR ADC with 8 single-ended or 4 differential inputs, 1 MSPS sample rate, internal temperature sensor - suitable for precision analog monitoring. |
| Timers | Two 32-bit GPTMs (each configurable as two 16-bit timers), supporting one-shot, periodic, PWM, input edge count/timing, and RTC modes - meets motor phase timing and encoder capture requirements. |
| Serial Interfaces | 2× UART (with FIFO, modem control), 1× I²C (standard/fast mode), 1× SSI (SPI-compatible) - enables multi-protocol fieldbus connectivity without external transceivers. |
| GPIO | 80 GPIO pins with programmable drive strength, slew rate, pull-up/down, and alternate function mapping - supports direct connection to sensors, actuators, and status LEDs. |
| Supply Voltage | 3.3 V nominal (2.25–3.63 V range), integrated LDO regulator - simplifies power design by eliminating external voltage regulation for core logic. |
Pinout & Package
LM3S808-EQN50-C2T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad - optimized for industrial PCB layouts requiring thermal reliability and moderate I/O density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 3.3 V main supply input for digital logic and integrated peripherals; requires local 0.1 µF decoupling. |
| GND | Ground Reference | Digital ground return for all internal circuits; must be connected to low-impedance system ground plane. |
| USB0VBUS | USB VBUS Detection | Input sensing USB host power presence; used to enable/disable USB PHY and enter device mode. |
| PD0/U0RX | UART0 Receive | Primary UART receive pin; supports TTL-level serial communication with software-configurable baud rate. |
| PD1/U0TX | UART0 Transmit | Primary UART transmit pin; drives active-low logic compatible with RS-232 level shifters or direct MCU-to-MCU links. |
| PC4/I2C0SCL | I²C Clock Line | Open-drain output for I²C bus clock; requires external 4.7 kΩ pull-up to 3.3 V for standard-mode (100 kHz) or fast-mode (400 kHz) operation. |
| PC5/I2C0SDA | I²C Data Line | Open-drain bidirectional I²C data line; shares same pull-up as SCL and supports multi-master arbitration. |
| PA0/AIN0 | Analog Input Channel 0 | First ADC input channel; accepts 0–3.3 V analog signals; internally selectable as temperature sensor input. |
| PF0/TRST | JTAG Test Reset | JTAG boundary-scan test reset input; active-low signal used during debug initialization and factory testing. |
| PF1/TCK | JTAG Clock | JTAG TAP controller clock input; synchronous to debugger clock; minimum pulse width 25 ns per TI spec. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO Regulator | On-chip 3.3 V regulator accepts 4.0–25 V input - eliminates need for external DC/DC or LDO in battery-powered or industrial 12/24 V systems. |
| Hardware Averaging ADC | Configurable 2x–64x hardware sample averaging per sequence - improves effective resolution to >11 bits without CPU overhead. |
| Dual UART with Modem Control | Full RTS/CTS/DTR/DSR signaling support - enables robust flow-controlled communication with legacy industrial modems or PLCs. |
| PWM Timer with Dead-Band Generation | Programmable dead-time insertion between complementary PWM outputs - prevents shoot-through in H-bridge motor drivers. |
| Temperature Sensor Interface | Internal calibrated temperature sensor routed to ADC channel 0 - provides ±3°C accuracy over –40°C to +85°C for thermal monitoring without external components. |
| Memory Protection Unit (MPU) | 8-region MPU with subregion disable and privilege access control - enforces code/data isolation for safety-critical firmware partitions. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers using Hall-effect feedback and space-vector PWM. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithm, PWM generation with <1 µs jitter, and ADC sampling synchronized to commutation events. Use Value: Deterministic 50 MHz Cortex-M3 core and dual GPTMs with quadrature encoder input mode enable precise rotor position tracking and torque ripple reduction. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and CO₂ via analog and I²C sensors. IC Role / Device Role / Timing Role: Low-power sensor hub aggregating data, performing local calibration, and transmitting via UART to gateway. Use Value: Integrated temperature sensor, 10-bit ADC with hardware averaging, and multiple sleep modes reduce BOM cost and extend battery life beyond 2 years. |
| PLC I/O Module | Medical Diagnostic Instrument |
Use Scenario: DIN-rail mounted digital I/O expansion module with 16 isolated inputs and 8 relay outputs. IC Role / Device Role / Timing Role: Central controller managing opto-isolator drivers, debounce logic, watchdog supervision, and Modbus RTU over UART. Use Value: 80 GPIOs with programmable slew rate and 24 KB SRAM allow simultaneous handling of 24 discrete channels with real-time status buffering. | Use Scenario: Portable blood glucose meter requiring analog front-end conditioning, button interface, LCD driver, and USB connectivity. IC Role / Device Role / Timing Role: System-on-chip replacing discrete ADC, microcontroller, and USB interface ICs. Use Value: On-chip USB PHY, integrated LDO, and 64 KB flash support secure firmware updates and eliminate external voltage translators and level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S811-EQN50-C2T | Same core and package, but adds USB 2.0 OTG controller and 128 KB flash - no additional GPIO or ADC channels. | Required when USB device/host functionality is needed; not drop-in due to different peripheral register map and USB PHY power sequencing. | Select LM3S811-EQN50-C2T only if USB connectivity is mandatory and firmware can accommodate revised peripheral initialization. |
| TM4C123GH6PM | Successor family with Cortex-M4F core, FPU, 256 KB flash, 32 KB SRAM, enhanced ADC (12-bit, 2MSPS), and updated peripheral set - pin-compatible in 64-pin LQFP variant only. | Supports floating-point math for advanced filtering and higher-resolution analog acquisition; not pin-compatible in 100-pin footprint. | Choose TM4C123GH6PM for new designs needing higher performance or extended lifecycle; migration requires PCB redesign for 100-pin version. |
Compared with LM3S808-EQN50-C2T, LM3S811-EQN50-C2T adds USB but increases firmware complexity, while TM4C123GH6PM delivers higher compute throughput and analog precision at the cost of layout change - making LM3S808-EQN50-C2T optimal for cost-sensitive, USB-free industrial control where proven qualification matters.
Availability
LM3S808-EQN50-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and PLC I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for LM3S808-EQN50-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-grade microcontrollers.
The Stellaris LM3S series was engineered for deterministic real-time control in harsh environments, targeting applications like motor drives, building automation, and sensor fusion where reliability, low-latency interrupt response, and integrated analog peripherals are critical.
FAQ
What is the maximum operating frequency of the LM3S808-EQN50-C2T?
The LM3S808-EQN50-C2T operates at a maximum CPU clock frequency of 50 MHz, derived from an internal PLL that multiplies the crystal oscillator or external clock source. This frequency is fully supported across the entire industrial temperature range (–40°C to +85°C) and ensures consistent real-time performance for time-critical tasks such as motor commutation and ADC sampling synchronization.
Does the LM3S808-EQN50-C2T include an integrated USB interface?
No, the LM3S808-EQN50-C2T does not include a USB controller or PHY. Unlike later Stellaris variants such as the LM3S811, this part relies solely on UART, I²C, and SSI for serial communication. USB functionality requires external transceivers or a separate USB-capable MCU - confirmed by the absence of USB-related registers and pins in the LM3S808-EQN50-C2T datasheet.
What package type and pin count does the LM3S808-EQN50-C2T use?
The LM3S808-EQN50-C2T uses a 100-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch and an exposed thermal pad. This package is explicitly designated in the "Orderable Devices" table of the official Texas Instruments datasheet (SPMS149I) and matches the pin diagram in Section 15 of the document.
Can the LM3S808-EQN50-C2T operate from a single 3.3 V supply?
Yes, the LM3S808-EQN50-C2T operates from a single 3.3 V supply applied to the VDD pin. Its integrated LDO regulator is bypassed in this configuration, and all I/Os are 3.3 V tolerant. The device meets full electrical specifications across 2.25–3.63 V, but 3.3 V is the recommended nominal supply for optimal noise immunity and peripheral compatibility.
Is the LM3S808-EQN50-C2T still in production or obsolete?
The LM3S808-EQN50-C2T is marked as "Not Recommended for New Designs" (NRND) by Texas Instruments, with last-time-buy (LTB) status announced in 2015. However, Aetrix Electronics maintains active inventory and offers extended lifecycle support including obsolescence forecasting, cross-reference assistance, and controlled distribution for legacy industrial programs still dependent on this qualified part.
LM3S808-EQN50-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 28
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K 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:
LM3S808-EQN50-C2T FAQ
1.How can I place an order for LM3S808-EQN50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S808-EQN50-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 LM3S808-EQN50-C2T reliable?
The price and inventory of LM3S808-EQN50-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S808-EQN50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S808-EQN50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S808-EQN50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S808-EQN50-C2T?
LM3S808-EQN50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S808-EQN50-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 LM3S808-EQN50-C2T?
For technical support, including LM3S808-EQN50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S808-EQN50-C2T requirements.
6.How does Aetrix verify that LM3S808-EQN50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S808-EQN50-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 LM3S808-EQN50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S808-EQN50-C2T?
All LM3S808-EQN50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S808-EQN50-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 LM3S808-EQN50-C2T part is unused and in its original packaging.
Return procedure for LM3S808-EQN50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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