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Texas Instruments LM3S1918-EQC50-A2
- Part No.:
- LM3S1918-EQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1918-EQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
LM3S1918-EQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (8-channel), dual UARTs, I²C, SSI, and PWM-capable timers. It operates at 50 MHz and targets low-power industrial control and sensor interface applications.
For engineers reviewing the LM3S1918-EQC50-A2 datasheet, LM3S1918-EQC50-A2 pinout, LM3S1918-EQC50-A2 application, or LM3S1918-EQC50-A2 equivalent, key selection considerations include hibernation support, on-chip RTC, analog peripheral integration, and Cortex-M3 debug capabilities including SWD and JTAG.
Technical Context
The LM3S1918-EQC50-A2 implements the ARM Cortex-M3 processor core with Thumb-2 instruction set, NVIC for interrupt management, SysTick timer, and MPU for memory protection. It integrates a hibernation module with battery-backed RTC and 2 KB of hibernate memory.
Peripherals include an 8-channel 12-bit ADC with hardware averaging, two UARTs supporting IrDA/SIR, one I²C master/slave interface, one SSI controller, and six general-purpose timers-two 32-bit and four 16-bit-with PWM, capture, and RTC modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs Thumb-2 instructions at up to 50 MHz |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface and single-cycle access at 50 MHz |
| SRAM | 64 KB on-chip SRAM, zero-wait-state operation at full speed |
| ADC | 12-bit SAR ADC with 8 input channels, configurable sample sequencers, and hardware averaging |
| Hibernation Module | Includes RTC, battery-backed 2 KB RAM, and wake-on-RTC/external-pin capability |
| Timers | Six GPTMs: two 32-bit and four 16-bit, supporting one-shot, periodic, PWM, capture, and RTC modes |
| Communication | Two UARTs (one with IrDA/SIR), one I²C, one SSI, all with FIFO and interrupt support |
Pinout & Package
LM3S1918-EQC50-A2 is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per TI SPMS033I datasheet Rev I, July 2014.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Separate domains for digital core (VDDC), analog (VDDA), and I/O (VDD); enable noise isolation |
| GND, GNDA, GNDC | Ground returns | Dedicated analog/digital/thermal ground pins reduce coupling and improve ADC accuracy |
| PF0–PF7 | GPIO Port F | Configurable as GPIO or alternate functions including NMI, CAN0RX/CAN0TX, and USB signals |
| PA0–PA7 | GPIO Port A | Supports UART0, SSI0, I²C0, and ADC0 channel inputs; includes internal pull-up/pull-down |
| JTAG/SWD | Debug interface | TCK, TMS, TDI, TDO, nTRST, and SWDIO/SWCLK pins support full debug and programming access |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation with RTC | Enables sub-µA sleep current with timekeeping and wake-on-event without external components |
| Integrated Analog Front-End | Single-chip solution for sensor signal acquisition: 12-bit ADC + internal temp sensor + reference voltage |
| Peripheral Multiplexing | Multiple peripherals share GPIO pins via software-selectable alternate functions, reducing board routing complexity |
| Cortex-M3 Debug Architecture | Full SWD/JTAG support with NVIC, SysTick, and MPU enables deterministic real-time debugging and secure execution |
| Flash Security | Lock bits prevent unauthorized read-out of flash contents; supports firmware IP protection in production units |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers using PWM outputs and ADC feedback. IC Role / Device Role / Timing Role: Real-time motor commutation controller with precise 50 MHz timing, ADC sampling, and hibernation-ready fault recovery. Use Value: Eliminates external RTC and power supervisor ICs; reduces BOM count by integrating hibernation, PWM, and analog sensing. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and pressure with periodic wake-up. IC Role / Device Role / Timing Role: Low-power system controller managing sensor interfaces, data logging, and scheduled wireless transmission. Use Value: Sub-1 µA hibernate current extends battery life to >5 years; on-chip RTC eliminates external timing component. |
| Programmable Logic Controller (PLC) | Medical Diagnostic Instrument |
Use Scenario: Compact DIN-rail mounted PLC executing ladder logic with discrete I/O, serial communication, and watchdog supervision. IC Role / Device Role / Timing Role: Deterministic control engine with dual UARTs for Modbus RTU, GPIO for digital I/O expansion, and hardware watchdog. Use Value: Integrated NVIC and MPU ensure predictable interrupt latency and memory isolation for certified control tasks. | Use Scenario: Portable blood glucose meter requiring accurate analog measurement, user interface, and data storage. IC Role / Device Role / Timing Role: Signal acquisition and processing unit with 12-bit ADC, internal temperature sensor, and flash-based calibration storage. Use Value: On-chip ADC reference and hardware averaging achieve ±1 LSB INL, meeting ISO 15197 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S1968-EQC50-A2 | Same package and pinout; adds CAN controller and removes one UART; identical flash/SRAM/peripherals otherwise | Better suited for automotive body electronics or industrial fieldbus nodes requiring CAN 2.0B | Select when CAN interface is required and UART0 is not needed |
| TM4C123GH6PM | Successor family; 80 MHz Cortex-M4F core, 256 KB flash, 32 KB SRAM, FPU, enhanced analog and connectivity peripherals | Higher performance, floating-point math, and updated ecosystem; requires PCB redesign due to different pinout and package | Select for new designs needing higher compute throughput or FPU support; not drop-in compatible |
Compared with LM3S1968-EQC50-A2, the LM3S1918-EQC50-A2 provides dual UARTs instead of CAN-critical for Modbus or legacy serial protocols-while maintaining identical hibernation, ADC, and timer capabilities. Against TM4C123GH6PM, it offers proven qualification and simpler toolchain support but lacks FPU and newer peripheral features.
Availability
LM3S1918-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic controllers, and portable medical instruments requiring stable component supply and long-term lifecycle support.
Supply support for LM3S1918-EQC50-A2 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, delivering analog and embedded processing solutions across industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as the first ARM Cortex-M3-based microcontroller family for cost-sensitive, low-power embedded applications requiring integrated analog, connectivity, and energy-efficient operation.
FAQ
What is the maximum operating frequency of the LM3S1918-EQC50-A2?
The LM3S1918-EQC50-A2 operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This frequency applies to both CPU execution and peripheral timing, enabling deterministic real-time response in control loops and communication stacks. All specifications in the TI SPMS033I datasheet assume this 50 MHz condition unless otherwise noted.
Does the LM3S1918-EQC50-A2 support hibernation mode with battery backup?
Yes, the LM3S1918-EQC50-A2 includes a dedicated hibernation module with battery-backed real-time clock (RTC), 2 KB of hibernate memory, and wake-on-RTC-match or external pin events. When powered from VBAT, it draws less than 1 µA while maintaining timekeeping and retaining critical state-enabling multi-year operation in battery-powered sensor nodes without external RTC or supervisor ICs.
How many analog-to-digital converter (ADC) channels does the LM3S1918-EQC50-A2 have?
The LM3S1918-EQC50-A2 integrates a single 12-bit successive-approximation ADC with eight external input channels (ADC0–ADC7), plus an internal temperature sensor channel. It supports hardware sample averaging across up to 64 samples per conversion and uses four independent sample sequencers to manage trigger sources, priority, and DMA handshaking without CPU intervention.
Is the LM3S1918-EQC50-A2 pin-compatible with other Stellaris LM3S devices?
The LM3S1918-EQC50-A2 shares the same 100-pin LQFP package and pinout with several LM3S variants-including LM3S1968-EQC50-A2-but not all. Pin compatibility is confirmed only with parts explicitly marked "EQC50" and sharing the same revision suffix (e.g., -A2). Always verify against TI's official pin multiplexing tables before substitution, as peripheral assignments differ between models.
What debug interfaces are supported by the LM3S1918-EQC50-A2?
The LM3S1918-EQC50-A2 supports both JTAG and Serial Wire Debug (SWD) interfaces via dedicated pins (TCK, TMS, TDI, TDO, nTRST, SWDIO, SWCLK). It includes full ARM CoreSight debug infrastructure-NVIC, DWT, ITM, and FPB-enabling real-time trace, breakpoint setting, register inspection, and flash programming using standard tools like TI Code Composer Studio or ARM-compatible debug probes.
LM3S1918-EQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.25V ~ 2.75V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1918-EQC50-A2 FAQ
1.How can I place an order for LM3S1918-EQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1918-EQC50-A2 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 LM3S1918-EQC50-A2 reliable?
The price and inventory of LM3S1918-EQC50-A2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1918-EQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1918-EQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1918-EQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1918-EQC50-A2?
LM3S1918-EQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1918-EQC50-A2 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 LM3S1918-EQC50-A2?
For technical support, including LM3S1918-EQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1918-EQC50-A2 requirements.
6.How does Aetrix verify that LM3S1918-EQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1918-EQC50-A2 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 LM3S1918-EQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1918-EQC50-A2?
All LM3S1918-EQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1918-EQC50-A2, 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 LM3S1918-EQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S1918-EQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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