ATtiny44-20SU 8-bit AVR Microcontroller 4KB Flash Memory SOP-14

ATtiny44-20SU 8-bit AVR Microcontroller SOP-14 delivers a powerful yet compact solution for embedded control projects where both size and efficiency are paramount. This high-performance, low-power AVR microcontroller utilizes 4KB of in-system self-programmable Flash memory, ensuring you have ample space for complex application code. The enhanced RISC architecture executes instructions in a single clock cycle, consequently achieving throughputs approaching 1 MIPS per MHz, which balances power consumption and processing speed exceptionally well. Furthermore, its small SOP-14 package and rich peripheral set—including an 8-channel 10-bit ADC and various timers—make it a favorite for engineers developing battery-operated and space-constrained devices. Therefore, rely on the ATtiny44-20SU to drive your next generation of intelligent, miniature electronic products efficiently.

Key Features:

• High-Performance AVR RISC Core: Achieves execution speeds up to 20 MIPS at 20 MHz, delivering excellent performance for an 8-bit MCU.
• Low Power Consumption: Features various power-saving sleep modes, making it ideal for battery-powered or energy-harvesting applications.
• 4KB Flash Memory: Provides 4 Kbytes of In-System Self-Programmable Flash memory for reliable code storage.
• 256 Bytes SRAM and EEPROM: Includes 256 bytes of static RAM and 256 bytes of electrically erasable programmable read-only memory for data storage.
• 10-bit ADC: Features an 8-channel, 10-bit Analog-to-Digital Converter, enabling precise analog signal acquisition.
• SOP-14 Package: The surface-mount SOP-14 package allows for highly compact PCB designs.

Technical Specifications:

• CPU Core: 8-bit AVR RISC
• Maximum Operating Frequency: 20 MHz
• Operating Voltage Range: 2.7 V to 5.5 V
• Digital I/O Pins: 12 (Programmable)
• Timers/Counters: One 8-bit and one 16-bit Timer/Counter with PWM channels
• Communication Interfaces: Universal Serial Interface (USI) supporting TWI/I²C and SPI modes
• Internal Oscillator: Calibrated internal oscillator (8 MHz and other options)
• External Interrupts: Supports interrupt-on-pin-change on 12 I/O pins
• Temperature Grade: Industrial (−40°C to +85°C)

Mechanical Specifications:

• Package Type: SOP (Small Outline Package)
• Pin Count: 14
• Mounting Style: Surface Mount Device (SMD/SMT)
• Moisture Sensitivity Level (MSL): MSL 1 (Unlimited floor life ≤ 30°C/85% RH)
• RoHS Compliance: Yes (Lead-free finish)

Dimensions:

• Body Length: ≈ 8.65 mm
• Body Width: ≈ 3.9 mm
• Pitch: 1.27 mm (Standard 50 mil pitch)
• Height (Max): ≈ 1.75 mm
• Soldering: Suitable for standard reflow soldering profiles.

Pinout and Wiring:

• VCC (Pin 14): Connect to the positive power supply (2.7 V to 5.5 V).
• GND (Pin 7): Connect to the ground potential (0 V).
• PCINT Pins (PA0-PA7, PB0-PB3): These 12 pins serve as general-purpose I/O and support interrupt-on-pin-change functionality.
• RESET (Pin 4): Connect to VCC via a pull-up resistor (typically 10 kΩ) for normal operation; pull low to reset the MCU.
• ADC Channels: Pins PA0 through PA7 function as analog input channels for the internal ADC.

Datasheet Reference:

• Download ATtiny24/44/84 Datasheet

Commonly Used in:

• Wearable Electronics: Its small size and low power capabilities make it perfect for smart watches and fitness trackers.
• Sensor Hubs: Collects and processes data from multiple sensors before transmitting the information.
• Power Management Circuits: Controls battery charging, monitoring, and sleep modes in portable equipment.

Applications:

• Battery Monitoring: Uses the 10-bit ADC to accurately measure and report battery voltage and current.
• Simple Motor Control: Drives small DC motors or stepper motors utilizing its integrated PWM timers.
• Access Control Keypads: Manages key presses, debouncing, and communicates status via the USI peripheral.
• Remote Sensing Nodes: Forms the core processing unit for wireless or wired environmental monitoring applications.

Equivalent Models:

• ATtiny84-20SU: This model is the direct upgrade, offering 8KB of Flash memory while maintaining the same pinout and package.
• PIC16F684: However, this is a functionally similar 14-pin competitor from Microchip’s PIC family, offering comparable memory and peripherals.
• ATtiny44A-SSU: This is a newer, power-optimized revision from Microchip, which directly replaces the legacy ATtiny44-20SU part.

Package Includes:

• 1 x ATtiny44-20SU 8-bit AVR Microcontroller SOP-14