Overview
The ATtiny28V-4AU is a compact 8-bit microcontroller from Microchip's AVR series, optimized for low-power embedded applications. With 2KB of Flash memory and 128B of SRAM, it suits simple control tasks in consumer electronics, IoT devices, and industrial systems. Its 4MHz clock speed and wide voltage range (2.7V–5.5V) enhance flexibility in battery-operated designs. The microcontroller integrates 18 programmable I/O pins, analog comparators, and timers, enabling interfacing with sensors, switches, and actuators. Its small footprint (TSSOP package) and cost-effectiveness make it a popular choice for high-volume production.
Structure and Working Principle
The ATtiny28V-4AU is built on AVR RISC architecture, executing most instructions in a single clock cycle for efficient performance. It includes a non-volatile Flash memory for code storage, SRAM for temporary data, and EEPROM for parameter retention. The CPU core interfaces with peripherals via configurable I/O ports. Power management features include multiple sleep modes (Idle, Power-down) to minimize energy consumption. Clock options allow internal or external oscillator use. Analog comparators enable basic signal processing without external components, simplifying circuit design.
Key Features
Low power consumption (0.1µA in Power-down mode) is a standout feature, ideal for battery-powered devices. The 18 I/O pins support digital input/output, interrupts, and PWM outputs for motor control. On-chip timers facilitate precise event timing or waveform generation. Despite its limited memory, the ATtiny28V-4AU supports in-system programming (ISP) for firmware updates. Its robust design ensures reliable operation in industrial environments (-40°C to +85°C). The absence of an ADC may require external ICs for analog sensor integration.
Application Areas
Common applications include remote controls, LED lighting systems, and simple automation controllers. Its low cost and minimal external component requirements suit disposable medical devices and toy electronics. Industrial uses encompass sensor nodes, relay controls, and HVAC system interfaces. In consumer goods, the microcontroller powers smart buttons, timers, and low-data-logging devices. Developers often pair it with RF modules for wireless functionality in compact designs. Its limitations (e.g., no UART) may necessitate workarounds for serial communication.
Maintenance and Precautions
To ensure longevity, avoid exceeding the rated voltage (5.5V max) and adhere to ESD precautions during handling. Use decoupling capacitors near the power pins to stabilize supply voltage. For firmware updates, follow Microchip’s ISP guidelines to prevent Flash corruption. Thermal management is rarely an issue due to low power dissipation, but high ambient temperatures may require derating. Regularly validate code efficiency to avoid SRAM overflow, which can cause unpredictable behavior.
B2B Procurement Guide
Bulk buyers should verify stock availability, as older AVR models may face phasedown risks. Compare distributors for volume discounts—prices typically drop 10–30% for orders exceeding 1,000 units. Lead times vary; authorized resellers like Digi-Key or Mouser often provide real-time inventory data. Consider alternative models (e.g., ATtiny25/45/85) if expanded features (ADC, more I/O) are needed. Request samples for prototyping before large-scale commitments. Check for compliance with RoHS or REACH if exporting to regulated markets.
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