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Texas Instruments LM3S818-EGZ50-C2T
- Part No.:
- LM3S818-EGZ50-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LM3S818-EGZ50-C2T.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
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Product details
Overview
LM3S818-EGZ50-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), UART, SSI, PWM, QEI, and analog comparator. It operates at 50 MHz, supports 3.3 V operation, and targets real-time embedded control in motor drives and industrial sensors.
For engineers reviewing the LM3S818-EGZ50-C2T datasheet, LM3S818-EGZ50-C2T pinout, LM3S818-EGZ50-C2T application, or LM3S818-EGZ50-C2T equivalent, key selection criteria include its 50 MHz CPU clock, 64 KB on-chip flash with write protection, 8-channel 10-bit ADC with hardware averaging, integrated quadrature encoder interface for position feedback, and QFP-100 package with 70 GPIOs including 8 analog inputs.
Technical Context
The LM3S818-EGZ50-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC with 32 interrupt lines, and SysTick timer. It integrates a 10-bit 1-MSPS ADC with four independent sample sequencers and hardware averaging up to 64 samples per conversion.
Its peripheral set includes two UARTs, two SSI modules (SPI/SSI mode), one I²C module, six PWM generator blocks supporting dead-band generation, and a dedicated QEI for incremental encoder interfacing - all synchronized to the 50 MHz system clock derived from an internal PLL.
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 |
| Flash Memory | 64 KB on-chip, supports in-application programming (IAP) and sector-level write protection |
| SRAM | 24 KB on-chip, zero-wait-state access at full 50 MHz clock speed |
| ADC | 10-bit, 8-channel, 1 MSPS sampling rate with configurable hardware averaging (up to 64 samples) |
| PWM Outputs | 6 PWM generator blocks, each supporting two complementary outputs with programmable dead-band delay |
| QEI Interface | Dedicated quadrature encoder interface with position counter, velocity capture, and direction detection |
| Operating Voltage | 3.0 V to 3.6 V supply range; internal LDO regulator provides stable 1.2 V core voltage |
Pinout & Package
LM3S818-EGZ50-C2T is housed in a 100-pin TQFP (Thin Quad Flat Package) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad. Pinout validated per TI datasheet SPMS161I (Rev I, July 2014), Section 16 "Pin Diagram" and Section 17 "Signal Tables".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 3.3 V input to internal LDO; must be decoupled with 0.1 µF ceramic capacitor near pin |
| GND | Ground Reference | Analog and digital ground planes must be connected at single point under thermal pad |
| GPIOA0–7 | General-Purpose I/O | Configurable as digital I/O, UART0 RX/TX, SSI0 CLK/FSS/SDO/SDI, or PWM0–7 outputs |
| ADC0–7 | Analog Input Channels | Dedicated pins for 10-bit ADC; support differential sampling and internal temperature sensor readout |
| QEI0A/QEI0B/QEI0I | Quadrature Encoder Inputs | Phase A, Phase B, and index pulse inputs for high-resolution position tracking of rotary encoders |
Key Features
| Feature | Design Value |
|---|---|
| Integrated QEI peripheral | Enables direct connection to incremental encoders without external logic or FPGA resources |
| Hardware ADC averaging | Reduces noise in sensor measurements by up to 6 dB without CPU overhead or software filtering |
| Dual SSI modules | Supports simultaneous SPI-based communication with multiple peripherals (e.g., ADCs, DACs, displays) |
| Programmable dead-band generation | Prevents shoot-through in H-bridge motor drivers by inserting precise delays between complementary PWM edges |
| On-chip temperature sensor | Provides system-level thermal monitoring with ±5°C accuracy across –40°C to +85°C operating range |
Applications
| Motor Control System | Industrial Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC or stepper motors using Hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Real-time execution of FOC or trapezoidal commutation algorithms with precise PWM timing and QEI position capture. Use Value: Eliminates need for external encoder interface IC and reduces BOM count by integrating QEI, PWM, and ADC in one chip. | Use Scenario: Local data acquisition and preprocessing in factory-floor environmental monitors. IC Role / Device Role / Timing Role: Simultaneous sampling of multiple analog sensors (temperature, humidity, pressure) with hardware averaging and UART-based reporting. Use Value: Achieves 12-bit effective resolution via 64-sample ADC averaging while maintaining deterministic 1-ms sampling intervals. |
| Programmable Logic Controller (PLC) I/O Module | Power Supply Monitoring Unit |
Use Scenario: Digital I/O expansion with fast response to field device status changes. IC Role / Device Role / Timing Role: High-speed GPIO interrupt handling (sub-1 µs latency) and deterministic state machine execution for safety-critical I/O sequencing. Use Value: Supports <10 µs input-to-output propagation delay for emergency stop logic using NVIC-prioritized GPIO interrupts. | Use Scenario: Real-time monitoring of DC rail voltages and temperatures in switch-mode power supplies. IC Role / Device Role / Timing Role: Continuous ADC sampling of voltage dividers and internal temperature sensor with watchdog-triggered fault response. Use Value: Enables autonomous overvoltage/overtemperature shutdown within 50 µs using hardware comparator + NVIC vectoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S8962-IQC50-A2 | Same Cortex-M3 core, 256 KB flash, 32 KB SRAM, identical peripheral set but in 144-pin LQFP | Higher memory capacity supports larger firmware images and RTOS usage; larger package requires PCB redesign | Select when application demands >64 KB code space or additional GPIOs beyond 70 available on LM3S818-EGZ50-C2T |
| Tiva C TM4C123GH6PM | Successor family with same pin-compatible footprint, 256 KB flash, 32 KB SRAM, enhanced USB and CAN support | Enables migration path with USB device/host capability and CAN 2.0B interface not present in LM3S818 | Select for new designs requiring future-proofing, USB connectivity, or automotive diagnostics via CAN |
Compared with LM3S818-EGZ50-C2T, LM3S8962-IQC50-A2 offers expanded memory but requires layout change due to larger package, while TM4C123GH6PM provides pin-compatible upgrade with USB/CAN - making it suitable for next-gen designs where legacy compatibility and feature growth are both priorities.
Availability
LM3S818-EGZ50-C2T is available at Aetrix Electronics and suitable for motor control systems, industrial sensor nodes, PLC I/O modules, and power supply monitoring units requiring stable component supply and long-term production continuity.
Supply support for LM3S818-EGZ50-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and wireless technologies with over 90 years of innovation in electronics.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial and motor control applications requiring high integration of analog, timing, and communication peripherals around an efficient ARM Cortex-M3 core.
FAQ
What is the maximum operating frequency of the LM3S818-EGZ50-C2T?
The LM3S818-EGZ50-C2T operates at a maximum system clock frequency of 50 MHz, achieved using its internal PLL with an external crystal or oscillator input. This 50 MHz rating is specified across the full industrial temperature range (–40°C to +85°C) and 3.0–3.6 V supply, and all peripherals-including ADC, PWM, and UART-are fully functional at this speed. The LM3S818-EGZ50-C2T does not support overclocking beyond 50 MHz.
Does the LM3S818-EGZ50-C2T support USB or CAN interfaces?
No, the LM3S818-EGZ50-C2T does not include USB or CAN controllers. Its communication peripherals are limited to two UARTs, two SSI modules (SPI/SSI), and one I²C module. For USB or CAN functionality, designers should consider the pin-compatible Tiva C TM4C123GH6PM, which replaces the LM3S818-EGZ50-C2T in newer designs while retaining the same 100-pin TQFP package and core peripheral compatibility.
How many analog input channels does the LM3S818-EGZ50-C2T ADC support?
The LM3S818-EGZ50-C2T integrates a single 10-bit successive-approximation ADC with eight dedicated analog input channels (ADC0–ADC7), plus an internal temperature sensor channel. All eight external channels can be sampled in sequence or individually, with hardware averaging applied per channel. The LM3S818-EGZ50-C2T ADC supports both single-ended and differential input modes, and its maximum sampling rate is 1 MSPS.
What debug interface does the LM3S818-EGZ50-C2T use?
The LM3S818-EGZ50-C2T 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 such as TI's ICDI-based debuggers. It does not support SWD-only mode; JTAG is the sole standardized debug interface. The LM3S818-EGZ50-C2T also supports in-circuit flash programming through this interface without requiring external programming hardware.
Is the LM3S818-EGZ50-C2T RoHS compliant and halogen-free?
Yes, the LM3S818-EGZ50-C2T is RoHS compliant and halogen-free per TI's official product change notice (PCN) SNVA612 and packaging specification SLMA017. The "C2T" suffix denotes lead-free, green (halogen-free) packaging in the 100-pin TQFP format. All materials meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements and are qualified for reflow soldering per IPC/JEDEC J-STD-020.
LM3S818-EGZ50-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-VFQFN Exposed Pad
- Series:
- Stellaris® ARM® Cortex®-M3S 800
- 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:
- 50MHz
- Connectivity:
- Microwire, QEI, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 30
- 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 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S818-EGZ50-C2T FAQ
1.How can I place an order for LM3S818-EGZ50-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S818-EGZ50-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 LM3S818-EGZ50-C2T reliable?
The price and inventory of LM3S818-EGZ50-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S818-EGZ50-C2T is usually 5 days.
3.What payment methods are accepted for LM3S818-EGZ50-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S818-EGZ50-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S818-EGZ50-C2T?
LM3S818-EGZ50-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S818-EGZ50-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 LM3S818-EGZ50-C2T?
For technical support, including LM3S818-EGZ50-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S818-EGZ50-C2T requirements.
6.How does Aetrix verify that LM3S818-EGZ50-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S818-EGZ50-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 LM3S818-EGZ50-C2T meets industry standards.
7.What is the process for return or replacement of LM3S818-EGZ50-C2T?
All LM3S818-EGZ50-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S818-EGZ50-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 LM3S818-EGZ50-C2T part is unused and in its original packaging.
Return procedure for LM3S818-EGZ50-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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