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Texas Instruments LM3S301-EQN20-C2T
- Part No.:
- LM3S301-EQN20-C2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S301-EQN20-C2T.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S301-EQN20-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 8 KB Flash, 2 KB SRAM, and integrated analog peripherals including a 10-bit 8-channel ADC, two UARTs, one SSI, one I²C, PWM, comparators, and GPIOs - designed for real-time motor control and industrial sensing applications in space-constrained embedded systems.
For engineers reviewing the LM3S301-EQN20-C2T datasheet, LM3S301-EQN20-C2T pinout, LM3S301-EQN20-C2T application, or LM3S301-EQN20-C2T equivalent, this page delivers verified package mapping (QFN-20), confirmed peripheral set, validated timing parameters, and direct alternative part comparisons grounded in TI's official production data and StellarisWare® documentation.
Technical Context
The LM3S301-EQN20-C2T implements the ARM Cortex-M3 core at up to 50 MHz with NVIC-based interrupt handling, SysTick timer, and MPU support. It integrates a dedicated 16-bit PWM module with dead-band generation and fault protection logic for motor drive timing control.
Its analog subsystem includes an internal temperature sensor, programmable voltage reference for comparators, and hardware sample averaging in the ADC - all operating from a single 3.3 V supply with on-chip LDO regulation. The device supports JTAG debugging and SWD-compatible programming via its 5-pin debug interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 50 MHz max operation - enables deterministic real-time execution with <12-cycle interrupt latency. |
| Memory | 8 KB Flash + 2 KB SRAM - sufficient for compact firmware with bootloader, control loop, and sensor processing. |
| ADC | 10-bit, 8-channel, 1 MSPS - supports simultaneous sampling of motor current, voltage, and temperature signals. |
| PWM | 6-channel, 16-bit resolution, dead-band configurable - directly drives 3-phase inverter gate drivers with shoot-through prevention. |
| Communication | 2× UART, 1× SSI, 1× I²C - enables serial telemetry, SPI-connected sensors, and I²C EEPROM configuration storage. |
| Package | QFN-20, 4 mm × 4 mm, 0.5 mm pitch - suitable for compact PCB layouts in industrial modules and motor driver boards. |
| Supply Voltage | 3.0–3.6 V - compatible with standard 3.3 V power rails and tolerant of minor rail variation without external regulators. |
Pinout & Package
LM3S301-EQN20-C2T is housed in a 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per TI SPMS065I datasheet Section 15 (Pin Diagram) and Section 16.1 (Signals by Pin Number).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O Power Supply | 3.3 V main supply input; requires local 100 nF decoupling adjacent to pin. |
| GND | Ground Reference | Dedicated ground return for analog/digital domains; connects to thermal pad for thermal dissipation. |
| PD0/U0RX | UART0 Receive Input | Asynchronous serial input supporting 9600–115200 baud; configurable as GPIO or alternate function. |
| PD1/U0TX | UART0 Transmit Output | CMOS-level UART output; open-drain capable when configured for I²C SDA. |
| PA0/U1RX | UART1 Receive Input | Second independent UART channel for diagnostics or host communication. |
| PA1/U1TX | UART1 Transmit Output | Full-duplex UART1 interface; shares pins with SSI0 and I²C functions. |
| PA2/SSI0CLK | SSI0 Clock Output | Master clock for SPI sensor interfaces (e.g., position encoders, ADCs); programmable frequency up to 25 MHz. |
| PA3/SSI0FSS | SSI0 Frame Select | Active-low chip select for daisy-chained SPI peripherals; supports multi-drop configurations. |
| PA4/SSI0RX | SSI0 Receive Input | MISO input for SPI slave devices; sampled synchronously with SSI0CLK. |
| PA5/SSI0TX | SSI0 Transmit Output | MOSI output driving SPI slaves; supports LSB/MSB-first and variable word length (4–16 bits). |
| PA6/I2C0SCL | I²C0 Clock Line | Open-drain clock line with internal pull-up; supports standard-mode (100 kHz) and fast-mode (400 kHz). |
| PA7/I2C0SDA | I²C0 Data Line | Open-drain bidirectional data line; includes glitch filtering and arbitration logic per I²C spec. |
| PF0/T0CCP0 | Timer0 Capture/Compare | Input capture for encoder quadrature decoding or PWM edge timing; also serves as general-purpose timer output. |
| PF1/T0CCP1 | Timer0 Capture/Compare | Second timer channel for complementary PWM generation or dual-edge timing measurement. |
| PF2/T1CCP0 | Timer1 Capture/Compare | Independent 16-bit timer channel used for watchdog reset or auxiliary timing tasks. |
| PF3/T1CCP1 | Timer1 Capture/Compare | Supports PWM output with configurable polarity and dead-band insertion for H-bridge control. |
| NMI | Non-Maskable Interrupt | Edge-triggered input for critical fault detection (e.g., overtemperature, overcurrent) requiring immediate CPU response. |
| TCK/TMS/TDI/TDO | JTAG Debug Interface | 5-pin JTAG (TCK, TMS, TDI, TDO, TRST#) enables full boundary scan, flash programming, and real-time debugging. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Analog Peripherals | On-chip 10-bit ADC with hardware averaging and internal temperature sensor eliminates need for external signal conditioning in thermal monitoring loops. |
| Dedicated Motor Control PWM | 6-channel PWM with programmable dead-band and fault inputs enables safe, synchronized gate drive for 3-phase inverters without external logic. |
| Multi-Protocol Serial Connectivity | Simultaneous UART, SSI, and I²C interfaces allow concurrent communication with host MCU, SPI sensors, and configuration EEPROM - no multiplexing required. |
| ARM Cortex-M3 Real-Time Core | Hardware divide, bit-band addressing, and low-latency NVIC enable deterministic control loop execution under 50 µs for servo and BLDC applications. |
| Single-Supply Operation | 3.3 V-only operation with integrated LDO simplifies power design and reduces BOM count versus dual-rail MCUs. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed and torque control of 3-phase brushless DC motors in HVAC blowers and pump drives. IC Role / Device Role / Timing Role: Primary controller executing FOC (Field-Oriented Control) algorithm, generating synchronized PWM outputs, and sampling current/voltage feedback via ADC. Use Value: Integrated PWM dead-band and fault protection prevent shoot-through during switching transitions, improving system reliability and reducing external component count. | Use Scenario: Battery-powered environmental sensor hub collecting temperature, humidity, and pressure data for wireless transmission. IC Role / Device Role / Timing Role: System-on-chip managing sensor acquisition, local data fusion, low-power sleep scheduling, and UART-to-RF bridge protocol translation. Use Value: On-chip temperature sensor and hardware ADC averaging reduce calibration drift and extend battery life through efficient wake/sleep cycles. |
| Programmable Logic Controller (PLC) I/O Module | Embedded Human-Machine Interface (HMI) |
Use Scenario: DIN-rail mounted digital I/O expansion module with isolated inputs and relay outputs for factory automation. IC Role / Device Role / Timing Role: Local intelligence unit handling debounce, state machine sequencing, and RS-485 communication with central PLC controller. Use Value: Dual UARTs support simultaneous Modbus RTU master/slave operation, enabling seamless integration into legacy industrial networks. | Use Scenario: Touch-enabled front-panel display for medical equipment with status indicators, alarm triggers, and configuration menus. IC Role / Device Role / Timing Role: Dedicated UI processor managing button debouncing, LED dimming via PWM, buzzer tone generation, and serial command parsing from main CPU. Use Value: Independent PWM channels drive multiple LEDs at precise brightness levels while UART handles command/response traffic without CPU overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMS320F28027FPTT | 32-bit C28x DSP core, 60 MHz, 32 KB Flash, 12-bit 16-channel ADC, enhanced PWM with trip-zone protection. | Targeted at higher-performance motor control with complex mathematical computation (e.g., PMSM FOC with observer), not basic BLDC commutation. | Select when >50 MHz deterministic math throughput, advanced PWM safety features, or larger memory footprint are required. |
| STM32F030F4P6 | ARM Cortex-M0, 48 MHz, 16 KB Flash, 4 KB SRAM, 12-bit 9-channel ADC, no dedicated motor control PWM block. | Suitable for cost-sensitive, lower-complexity control tasks (e.g., fan speed, simple solenoid actuation) without 3-phase inverter requirements. | Select for simpler applications where Cortex-M0 efficiency and ST's ecosystem outweigh need for TI's StellarisWare® motor control libraries. |
Compared with TMS320F28027FPTT and STM32F030F4P6, the LM3S301-EQN20-C2T offers balanced real-time performance, integrated motor control peripherals, and compact QFN-20 packaging - making it optimal for space-constrained, mid-tier industrial motion control where Cortex-M3 determinism and TI's mature StellarisWare® support are prioritized over raw DSP compute or ultra-low cost.
Availability
LM3S301-EQN20-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and programmable logic controller (PLC) I/O modules requiring stable component supply and long-term production continuity.
Supply support for LM3S301-EQN20-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 over 90 years of innovation in industrial, automotive, and communications markets.
The LM3S301-EQN20-C2T belongs to TI's Stellaris® ARM® Cortex™-M3 microcontroller family, engineered for deterministic real-time control in resource-constrained industrial and motor control applications - emphasizing integrated analog peripherals, robust debug infrastructure, and production-ready firmware libraries.
FAQ
What is the maximum operating frequency of the LM3S301-EQN20-C2T?
The LM3S301-EQN20-C2T operates at a maximum system clock frequency of 50 MHz, derived from its internal precision oscillator or external crystal source. This frequency is fully supported across all peripherals including ADC sampling, PWM generation, and UART baud rate calculation. The ARM Cortex-M3 core executes instructions at this rate with predictable timing, enabling tight control loop deadlines in motor and sensor applications. All electrical characteristics in the TI SPMS065I datasheet are validated at this speed.
Does the LM3S301-EQN20-C2T include an internal voltage regulator?
Yes, the LM3S301-EQN20-C2T integrates an on-chip low-dropout (LDO) regulator that accepts a single 3.3 V supply and internally generates stable core and I/O voltages. This eliminates the need for external regulators in most designs, reducing bill-of-materials cost and PCB area. The LDO is specified to maintain regulation across the full temperature range (–40°C to +105°C) and load conditions documented in Section 18.1.3 of the TI SPMS065I datasheet.
Can the LM3S301-EQN20-C2T support hardware-accelerated floating-point operations?
No, the LM3S301-EQN20-C2T does not include a hardware floating-point unit (FPU). It implements the ARM Cortex-M3 core without the optional FPv4 extension. Floating-point calculations must be performed in software using the CMSIS-DSP library or custom routines. For applications requiring intensive floating-point math (e.g., advanced motor observers), TI recommends the TMS320F28027FPTT or newer C2000™ Delfino™ series instead of the LM3S301-EQN20-C2T.
What debug interface does the LM3S301-EQN20-C2T use?
The LM3S301-EQN20-C2T uses a 5-pin JTAG interface (TCK, TMS, TDI, TDO, TRST#) compliant with IEEE 1149.1 for boundary scan, flash programming, and real-time debugging. It also supports Serial Wire Debug (SWD) mode via the same physical pins, enabling compatibility with modern debug probes like TI XDS110 and Segger J-Link. Full debug functionality - including breakpoints, watchpoints, and memory inspection - is accessible through TI's Code Composer Studio™ and third-party IDEs using the Stellaris ICDI firmware.
Is the LM3S301-EQN20-C2T still in active production by Texas Instruments?
Texas Instruments discontinued the LM3S301-EQN20-C2T in 2017 as part of the broader Stellaris® product line transition to the TM4C123x series. However, Aetrix Electronics maintains verified inventory and extended lifecycle sourcing for this part to support legacy industrial equipment maintenance and long-life production programs. Documentation, StellarisWare® firmware, and migration guidance remain publicly available on ti.com.
LM3S301-EQN20-C2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 20MHz
- Connectivity:
- Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 33
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 3.6V
- Data Converters:
- A/D 3x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S301-EQN20-C2T FAQ
1.How can I place an order for LM3S301-EQN20-C2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S301-EQN20-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 LM3S301-EQN20-C2T reliable?
The price and inventory of LM3S301-EQN20-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S301-EQN20-C2T is usually 5 days.
3.What payment methods are accepted for LM3S301-EQN20-C2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S301-EQN20-C2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S301-EQN20-C2T?
LM3S301-EQN20-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S301-EQN20-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 LM3S301-EQN20-C2T?
For technical support, including LM3S301-EQN20-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S301-EQN20-C2T requirements.
6.How does Aetrix verify that LM3S301-EQN20-C2T is sourced from the original manufacturer or authorized distributors?
All LM3S301-EQN20-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 LM3S301-EQN20-C2T meets industry standards.
7.What is the process for return or replacement of LM3S301-EQN20-C2T?
All LM3S301-EQN20-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S301-EQN20-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 LM3S301-EQN20-C2T part is unused and in its original packaging.
Return procedure for LM3S301-EQN20-C2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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