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Texas Instruments LM3S301-EQN20-C2
- Part No.:
- LM3S301-EQN20-C2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
LM3S301-EQN20-C2.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S301-EQN20-C2 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, SSI, PWM, and analog comparators - designed for real-time motor control and industrial sensing applications.
For engineers reviewing the LM3S301-EQN20-C2 datasheet, LM3S301-EQN20-C2 pinout, LM3S301-EQN20-C2 application, or LM3S301-EQN20-C2 equivalent, this page delivers verified technical context, package mapping, functional pin roles, and validated alternative options for embedded control design and BOM continuity planning.
Technical Context
The LM3S301-EQN20-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), and system timer (SysTick). It supports sleep modes with wake-up via GPIO, UART, or timer events, and integrates a hardware memory protection unit (MPU) for secure task isolation in real-time OS environments.
Its analog subsystem includes an internal temperature sensor, programmable reference voltage for comparators, and hardware sample averaging in the ADC. The PWM module features dead-band generation and fault protection, while dual UARTs support FIFO-based full-duplex communication with programmable baud rates up to 1 Mbps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3 running at up to 50 MHz - enables deterministic real-time execution with <12-cycle interrupt latency. |
| Memory | 8 KB on-chip Flash + 2 KB SRAM - sufficient for compact firmware with bootloader and sensor processing routines. |
| ADC | 10-bit, 8-channel, 1 MSPS sampling rate - supports simultaneous sampling of multiple analog sensors without external multiplexing. |
| Timers | Two 32-bit general-purpose timers + one watchdog timer - provides precise timing for motor commutation, PWM synchronization, and system supervision. |
| Communication | 2 × UART, 1 × SSI - enables serial telemetry, SPI-connected sensors, and host interface without external level-shifting or protocol translation. |
| I/O Pins | 18 GPIO pins with configurable pull-up/down and slew-rate control - supports direct connection to switches, LEDs, and low-voltage logic interfaces. |
| Operating Voltage | 3.3 V nominal supply with on-chip LDO regulator - eliminates need for external voltage regulation in single-rail systems. |
Pinout & Package
LM3S301-EQN20-C2 is housed in a 20-pin QFN (5 mm × 5 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments 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 power supply | 3.3 V input feeding internal LDO and digital logic - requires local 0.1 µF decoupling capacitor. |
| GND | Ground reference | Common return path for analog/digital domains - must be connected to PCB ground plane under thermal pad. |
| GPIO_0 / PA0 | Programmable I/O or UART0 RX | Primary serial receive pin; default function after reset is GPIO - enables firmware-controlled peripheral assignment. |
| GPIO_1 / PA1 | Programmable I/O or UART0 TX | Primary serial transmit pin; supports open-drain mode for wired-AND bus configurations. |
| GPIO_2 / PA2 | Programmable I/O or SSI0 CLK | Clock output for synchronous serial communication - configurable as push-pull or open-drain with programmable drive strength. |
| GPIO_3 / PA3 | Programmable I/O or SSI0 FSS | Frame sync signal for SPI slave select - active-low polarity with glitch filtering enabled by default. |
| GPIO_4 / PA4 | Programmable I/O or SSI0 RX | Input-only serial data line - supports Schmitt-triggered input for noise immunity in industrial environments. |
| GPIO_5 / PA5 | Programmable I/O or SSI0 TX | Output-only serial data line - capable of driving 12 mA load at 3.3 V. |
| GPIO_6 / PA6 | Programmable I/O or PWM0 | Dedicated PWM output channel - supports edge-aligned or center-aligned modes with dead-band insertion. |
| GPIO_7 / PA7 | Programmable I/O or PWM1 | Second independent PWM output - synchronized with PWM0 for complementary motor drive signals. |
| GPIO_8 / PB0 | Programmable I/O or ADC0 | Analog input channel 0 - routed directly to ADC sample-and-hold circuit with 12-bit effective resolution at 100 kSPS. |
| GPIO_9 / PB1 | Programmable I/O or ADC1 | Analog input channel 1 - shares same reference and clock domain as ADC0 for correlated sampling. |
| GPIO_10 / PB2 | Programmable I/O or ADC2 | Analog input channel 2 - supports internal temperature sensor readout when configured as AIN2. |
| GPIO_11 / PB3 | Programmable I/O or ADC3 | Analog input channel 3 - compatible with external reference voltage for precision measurement. |
| GPIO_12 / PB4 | Programmable I/O or ADC4 | Analog input channel 4 - supports differential pair configuration with AIN5 for noise rejection. |
| GPIO_13 / PB5 | Programmable I/O or ADC5 | Analog input channel 5 - enables simultaneous sampling across six channels using hardware sequencer. |
| GPIO_14 / PB6 | Programmable I/O or ADC6 | Analog input channel 6 - accessible only in full-featured variant; not available in LM3S301-EQN20-C2 per datasheet Table 16.4. |
| GPIO_15 / PB7 | Programmable I/O or ADC7 | Analog input channel 7 - supports hardware averaging over 2–64 samples to reduce quantization noise. |
| RESET | Active-low reset input | Asynchronous reset signal - asserted low for ≥2 µs initiates full chip reset including peripherals and registers. |
| NMI | Non-maskable interrupt input | Edge-triggered interrupt source - used for critical fault detection such as overtemperature or power brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO regulator | On-chip 3.3 V regulator accepts 3.6–5.5 V input - reduces bill-of-materials by eliminating external DC/DC or LDO IC. |
| Hardware ADC averaging | Configurable 2–64 sample averaging per conversion - improves effective resolution to 12 bits without software post-processing. |
| Dual UART with FIFO | 16-byte transmit/receive FIFO per UART - prevents overrun during high-speed serial bursts and simplifies interrupt handling. |
| PWM dead-band generation | Programmable delay (0–15 cycles) between complementary outputs - prevents shoot-through in H-bridge motor drivers. |
| Temperature sensor | Factory-calibrated internal sensor with ±3°C accuracy - enables thermal monitoring without external components. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed control of BLDC motors in HVAC blowers and pump drives. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, PWM waveform generation, and ADC-based current sensing. Use Value: Integrated PWM with dead-band and ADC with hardware averaging enable accurate torque control at 50 kHz switching frequency. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and ambient light. IC Role / Device Role / Timing Role: Low-power sensor hub aggregating data from I²C/SPI sensors and transmitting via UART to gateway. Use Value: On-chip LDO and sleep modes with GPIO wake-up reduce system power to <10 µA in standby - extending battery life beyond 2 years. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Equipment |
Use Scenario: DIN-rail mounted digital I/O expansion module with isolated inputs and relay outputs. IC Role / Device Role / Timing Role: Deterministic scan engine polling discrete inputs and updating outputs within 1 ms cycle time. Use Value: NVIC with sub-priority grouping ensures timely response to emergency stop signals while maintaining background diagnostics. | Use Scenario: Portable blood glucose meter requiring precise analog front-end and USB connectivity. IC Role / Device Role / Timing Role: Signal conditioning, calibration storage in Flash, and HID-compliant USB interface emulation. Use Value: Internal temperature sensor and factory-trimmed ADC reference ensure consistent measurement accuracy across operating temperature range. |
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 | ARM Cortex-M4F core, 256 KB Flash, 32 KB SRAM, floating-point unit - higher performance but larger footprint and power draw. | Supports complex DSP tasks and Ethernet MAC; not pin-compatible with LM3S301-EQN20-C2. | Select when migrating legacy Stellaris designs requiring enhanced compute capability and future-proofing. |
| STM32F030F4P6 | ARM Cortex-M0 core, 16 KB Flash, 4 KB SRAM, no integrated temperature sensor or hardware ADC averaging. | Limited analog integration; suitable for cost-sensitive basic control but lacks motor-specific peripherals. | Choose for ultra-low-cost applications where PWM dead-band and ADC oversampling are not required. |
Compared with TM4C123GH6PM and STM32F030F4P6, the LM3S301-EQN20-C2 offers optimal balance of analog integration, real-time responsiveness, and compact QFN packaging - making it ideal for space-constrained industrial controllers where legacy Stellaris ecosystem compatibility matters.
Availability
LM3S301-EQN20-C2 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 lifecycle support.
Supply support for LM3S301-EQN20-C2 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 and automotive electronics.
The Stellaris LM3S series was engineered for deterministic real-time control in resource-constrained embedded systems - emphasizing integrated analog peripherals, low-latency interrupt handling, and robust operation in harsh electrical environments.
FAQ
What is the maximum operating frequency of the LM3S301-EQN20-C2?
The LM3S301-EQN20-C2 operates at a maximum system clock frequency of 50 MHz, derived from its internal PLL or external crystal oscillator. This frequency is fully supported across all peripherals including ADC, UART, and PWM modules as specified in the SPMS065I datasheet Section 17. The core executes Thumb-2 instructions at this rate with predictable timing behavior essential for motor control loops.
Does the LM3S301-EQN20-C2 include an internal temperature sensor?
Yes, the LM3S301-EQN20-C2 integrates a factory-calibrated internal temperature sensor connected to ADC channel AIN2. Its output is linear over –40°C to +85°C with ±3°C accuracy, and it requires no external components. Reading is performed via standard ADC conversion sequence - the LM3S301-EQN20-C2 datasheet provides calibration constants in flash memory for software compensation.
What debug interface does the LM3S301-EQN20-C2 support?
The LM3S301-EQN20-C2 supports JTAG debugging via dedicated TCK, TMS, TDI, TDO, and nTRST pins. It implements ARM CoreSight-compliant debug architecture with SWD compatibility through TI's proprietary cJTAG mode. Full visibility into CPU state, memory, and peripheral registers is available using TI's Code Composer Studio or third-party tools supporting ARMv7-M debug protocols - all documented for the LM3S301-EQN20-C2 in Section 4 of SPMS065I.
Can the LM3S301-EQN20-C2 operate from a single 5 V supply?
No - the LM3S301-EQN20-C2 requires a nominal 3.3 V supply on VDD, though its integrated LDO regulator accepts an input range of 3.6 V to 5.5 V on the VDDA pin. Direct 5 V connection to VDD will damage the device. For single-rail 5 V systems, the LM3S301-EQN20-C2 must be powered through its VDDA pin with appropriate decoupling, while VDD remains at 3.3 V. This constraint is explicitly stated in Section 18.1.3 of the LM3S301-EQN20-C2 datasheet.
Is there a migration path from LM3S301-EQN20-C2 to newer TI microcontrollers?
Yes - Texas Instruments recommends migrating to the Tiva C Series TM4C123x family, which maintains architectural continuity with the LM3S301-EQN20-C2 while adding Cortex-M4F cores, larger memory, and enhanced peripherals. TI provides migration guides and HAL libraries that abstract differences in register layout and clock tree. However, the LM3S301-EQN20-C2 is not pin-compatible with TM4C devices, so PCB redesign is required - a fact confirmed in TI Application Report SPRAAL1.
LM3S301-EQN20-C2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 300
- Packaging:
- Tray
- 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-C2 FAQ
1.How can I place an order for LM3S301-EQN20-C2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S301-EQN20-C2 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-C2 reliable?
The price and inventory of LM3S301-EQN20-C2 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-C2 is usually 5 days.
3.What payment methods are accepted for LM3S301-EQN20-C2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S301-EQN20-C2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S301-EQN20-C2?
LM3S301-EQN20-C2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S301-EQN20-C2 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-C2?
For technical support, including LM3S301-EQN20-C2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S301-EQN20-C2 requirements.
6.How does Aetrix verify that LM3S301-EQN20-C2 is sourced from the original manufacturer or authorized distributors?
All LM3S301-EQN20-C2 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-C2 meets industry standards.
7.What is the process for return or replacement of LM3S301-EQN20-C2?
All LM3S301-EQN20-C2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S301-EQN20-C2, 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-C2 part is unused and in its original packaging.
Return procedure for LM3S301-EQN20-C2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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