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Texas Instruments LM3S1968-EQC50-A2T
- Part No.:
- LM3S1968-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1968-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
LM3S1968-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated 12-bit ADC (8-channel), dual UARTs, I²C, SSI, PWM, and hibernation module. It operates at 50 MHz and supports motor control and industrial sensing applications.
For engineers reviewing the LM3S1968-EQC50-A2T datasheet, LM3S1968-EQC50-A2T pinout, LM3S1968-EQC50-A2T application, or LM3S1968-EQC50-A2T equivalent, this page delivers verified functional roles, validated package mapping, confirmed peripheral integration, and real-world use context for embedded control design.
Technical Context
The LM3S1968-EQC50-A2T implements the ARM Cortex-M3 core with nested vectored interrupt controller (NVIC), memory protection unit (MPU), and SysTick timer. It integrates a hibernation module with RTC, battery-backed memory, and wake-up sources including external pins and RTC match events.
Peripherals include two UARTs supporting IrDA/SIR, one I²C master/slave interface, two SSI modules, eight-channel 12-bit ADC with hardware averaging, four general-purpose timers (two 32-bit, two 16-bit), and six PWM outputs with fault handling. Clocking is managed via internal precision oscillator and PLL support up to 50 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, Thumb-2 instruction set, 50 MHz max operation |
| Memory | 256 KB on-chip flash (programmable in 1 KB sectors), 64 KB SRAM |
| ADC | 12-bit SAR ADC with 8 input channels, hardware sample averaging, internal temperature sensor |
| Timers | Four GPTMs: two 32-bit or four 16-bit; one watchdog; one SysTick; hibernation module with RTC |
| Communication | Two UARTs (IrDA/SIR capable), one I²C, two SSI (SPI/SSI/Microwire compatible) |
| PWM & Control | Six PWM outputs with dead-band generation, fault inputs, and synchronous update capability |
| Package | 100-pin LQFP (14 mm × 14 mm), RoHS-compliant, lead-free |
Pinout & Package
LM3S1968-EQC50-A2T is housed in a 100-pin LQFP (Leadless Quad Flat Package) with 0.5 mm pitch, thermal pad exposed on underside, and standard JEDEC MO-152AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital core (VDDC), analog (VDDA), and I/O (VDD) rails-separate filtering required per section |
| GND, GNDA, GNDC | Ground returns | Analog ground (GNDA) must be isolated from digital ground except at single-point connection |
| PD0–PD7, PE0–PE5, PF0–PF4, etc. | GPIO banks | Configurable as digital I/O, alternate function (UART, SSI, I²C, PWM), or analog input (ADC) |
| USB0VBUS, USB0ID | USB interface signals | Supports USB device mode only; requires external VBUS detection and ID pin pull-up/down |
| HIB, RTCCLK, HIBRST | Hibernation control | Enable hibernation entry/exit, provide RTC clock source, and reset hibernation logic independently |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module | Reduces power to ~1.4 µA with RTC running, battery-backed RAM retention, and multiple wake-up sources |
| Integrated Analog Subsystem | Single-chip solution for sensor interfacing: 12-bit ADC + internal temp sensor + analog comparators + reference voltage |
| Motor Control Peripherals | Six PWM outputs with configurable dead-band, fault inputs, and synchronous update for three-phase inverter control |
| Robust Communication Suite | Dual UARTs with IrDA/SIR, I²C with clock stretching, dual SSI with FIFO and DMA support |
| ARM Cortex-M3 Integration | NVIC with 64 interrupt lines, MPU for memory protection, SysTick for OS timing, and debug via JTAG/SWD |
Applications
| Industrial Motor Control | Building Automation Sensor Node |
|---|---|
Use Scenario: Three-phase BLDC motor drive in HVAC fan systems with closed-loop speed regulation and overcurrent protection. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithm, managing PWM generation, ADC sampling, and fault response in real time. Use Value: Integrated six-channel PWM with dead-band and fault inputs eliminates external gate driver logic and reduces BOM count by ≥3 components. | Use Scenario: Battery-powered CO₂ and temperature sensor node deployed in office ceiling grids with weekly wireless data upload. IC Role / Device Role / Timing Role: Low-power host MCU managing sensor reads, hibernation scheduling, RTC-triggered wake-up, and UART-to-LoRaWAN bridge firmware. Use Value: Hibernation current of 1.4 µA extends 2×AA battery life to >5 years without recharge or replacement. |
| Programmable Logic Controller (PLC) I/O Module | Medical Infusion Pump Controller |
Use Scenario: DIN-rail mounted digital I/O expansion module with 16-channel opto-isolated inputs and relay outputs. IC Role / Device Role / Timing Role: Real-time I/O coordinator handling scan cycle timing, input debouncing, output latching, and Modbus RTU communication over UART. Use Value: Dual UARTs enable simultaneous Modbus master (to fieldbus) and slave (to HMI) operation without software multiplexing overhead. | Use Scenario: Safety-critical infusion pump with flow rate monitoring, occlusion detection, and audible/visual alarm generation. IC Role / Device Role / Timing Role: Primary safety monitor executing dual-redundant ADC sampling, watchdog supervision, and fail-safe shutdown sequencing. Use Value: Hardware-based watchdog with windowed timeout and independent reset domain ensures deterministic recovery from lockup within 10 ms. |
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 part with same pinout, 80 MHz Cortex-M4F core, enhanced FPU, larger flash (256 KB → 256 KB), identical peripheral set plus USB OTG | Supports floating-point math-intensive algorithms (e.g., PID tuning, FFT-based diagnostics); USB host capability enables direct HID device integration | Select when upgrading legacy LM3S designs requiring higher compute throughput or USB host functionality |
| STM32F103VET6 | ARM Cortex-M3 at 72 MHz, 512 KB flash, 64 KB SRAM, but lacks hibernation module and integrated RTC battery backup; different pinout and peripheral register layout | Requires external RTC and backup capacitor for low-power timekeeping; no native µA-level hibernation state | Select when prioritizing flash density and ecosystem tooling over ultra-low-power hibernation features |
Compared with LM3S1968-EQC50-A2T, TM4C123GH6PM offers higher performance and USB host capability in identical packaging, while STM32F103VET6 trades hibernation depth for greater flash capacity and broader third-party IDE support-neither is pin-compatible without PCB revision.
Availability
LM3S1968-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, building automation sensor nodes, PLC I/O modules, and medical infusion pump controllers requiring stable component supply across long-lifecycle production programs.
Supply support for LM3S1968-EQC50-A2T 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, embedded processing, and connectivity solutions since 1930.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time embedded control applications requiring integrated analog, motor control peripherals, and ultra-low-power hibernation-targeting industrial, building, and medical equipment markets.
FAQ
What is the maximum operating frequency of the LM3S1968-EQC50-A2T?
The LM3S1968-EQC50-A2T operates at a maximum CPU frequency of 50 MHz, achieved using its internal precision oscillator and PLL configuration. This frequency is specified under full industrial temperature range (–40°C to +105°C) and 3.3 V supply conditions. The LM3S1968-EQC50-A2T does not support overclocking beyond 50 MHz, and all timing-critical peripherals-including ADC conversion, PWM resolution, and UART baud rates-are calibrated and guaranteed at this rated speed.
Does the LM3S1968-EQC50-A2T support USB device functionality?
Yes, the LM3S1968-EQC50-A2T includes a USB 2.0 full-speed device controller compliant with USB Specification Revision 2.0. It supports control, interrupt, bulk, and isochronous transfer types, and requires external USB PHY circuitry and VBUS detection. The LM3S1968-EQC50-A2T does not implement USB host or OTG modes-only device mode is available, and all USB stack software must reside in on-chip flash memory.
What is the hibernation current consumption of the LM3S1968-EQC50-A2T?
The LM3S1968-EQC50-A2T achieves a typical hibernation current of 1.4 µA when the hibernation module is active, RTC is enabled, and battery-backed RAM retains data. This value is measured at 3.3 V and 25°C with all non-hibernation peripherals disabled. The LM3S1968-EQC50-A2T maintains this ultra-low quiescent current while supporting wake-up via RTC match, external GPIO, or HIB interrupt-making it suitable for multi-year battery operation in remote sensor nodes.
How many ADC channels does the LM3S1968-EQC50-A2T support, and what is their resolution?
The LM3S1968-EQC50-A2T integrates a single 12-bit successive approximation register (SAR) ADC with eight analog input channels (AIN0–AIN7). It supports hardware sample averaging across up to 64 samples per conversion to improve effective resolution and noise immunity. The LM3S1968-EQC50-A2T also includes an internal temperature sensor and programmable voltage reference, enabling self-calibration and ambient monitoring without external components.
Is the LM3S1968-EQC50-A2T pin-compatible with any newer Texas Instruments microcontrollers?
Yes, the LM3S1968-EQC50-A2T is pin-compatible with the Tiva C Series TM4C123GH6PM in the 100-pin LQFP package. Both share identical mechanical footprint, power pin locations, and peripheral pin mappings-including UART, SSI, I²C, PWM, and ADC assignments. The LM3S1968-EQC50-A2T migration path to TM4C123GH6PM requires only firmware update and minor register-level adjustments due to enhanced Cortex-M4F core features and expanded peripheral capabilities.
LM3S1968-EQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- 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, IrDA, Microwire, QEI, 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:
LM3S1968-EQC50-A2T FAQ
1.How can I place an order for LM3S1968-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1968-EQC50-A2T 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 LM3S1968-EQC50-A2T reliable?
The price and inventory of LM3S1968-EQC50-A2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1968-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1968-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1968-EQC50-A2T transactions.
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4.How is shipping managed for LM3S1968-EQC50-A2T?
LM3S1968-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1968-EQC50-A2T 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 LM3S1968-EQC50-A2T?
For technical support, including LM3S1968-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1968-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S1968-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1968-EQC50-A2T 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 LM3S1968-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1968-EQC50-A2T?
All LM3S1968-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1968-EQC50-A2T, 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 LM3S1968-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S1968-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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