Overview
The ATtiny402-SSN is a cost-effective 8-bit microcontroller from Microchip's AVR family, designed for low-power embedded applications. It integrates 4KB of Flash memory, 256B SRAM, and 128B EEPROM, offering a balance of performance and efficiency. With a maximum operating frequency of 20MHz, it supports real-time control tasks while minimizing energy consumption. The microcontroller is housed in an SSOP-14 package, making it suitable for space-constrained designs. It is widely used in IoT edge devices, smart sensors, and small-scale automation due to its compact footprint and robust peripheral set.
Structure and Working Principle
The ATtiny402-SSN is built around an 8-bit AVR RISC core, executing most instructions in a single clock cycle for efficient processing. It includes a 10-bit ADC, multiple timers/counters, and communication interfaces (USART, SPI, I2C), enabling versatile system integration. Power management is a key feature, with sleep modes that reduce consumption to microamps. The device operates from 1.8V to 5.5V, accommodating battery-powered applications. Its non-volatile memory (Flash/EEPROM) ensures data retention during power cycles.
Key Features
Low-power operation is a standout feature, with active mode current below 300µA/MHz and standby modes as low as 100nA. The Event System allows peripheral-to-peripheral communication without CPU intervention, optimizing response times and energy use. The microcontroller supports Microchip's MPLAB X IDE and Atmel Studio, with extensive debugging options. Hardware-based CRC/SCAN and Windowed Watchdog Timer enhance reliability in critical applications.
Application Areas
The ATtiny402-SSN is commonly deployed in consumer electronics (remote controls, LED controllers), industrial systems (sensor nodes, actuator controls), and smart home devices (thermostats, switches). Its low cost and minimal BOM requirements make it popular for high-volume products. In IoT applications, it serves as a bridge between sensors and wireless modules (e.g., BLE/Wi-Fi). Automotive aftermarket products like OBD-II adapters also utilize this MCU for basic data processing tasks.
Maintenance and Precautions
Proper ESD handling is critical during assembly and testing. Use grounded workstations and wrist straps when working with the SSOP-14 package. Flash memory has a rated endurance of 10,000 write cycles; implement wear-leveling algorithms if frequent updates are expected. For firmware updates, follow Microchip's guidelines for voltage sequencing during programming. Avoid exposing the device to voltages beyond absolute maximum ratings (6V) to prevent latch-up or permanent damage.
B2B Procurement Guide
When sourcing ATtiny402-SSN, verify supplier authenticity to counter gray market risks. Microchip authorized distributors (e.g., Digi-Key, Mouser) provide traceable parts with full warranty support. Lead times vary; for large orders (>10k units), plan 8-12 weeks ahead. Consider alternatives like ATtiny404 or ATtiny204 if additional I/O or memory is needed. Request samples for prototyping before volume commitments. Check for RoHS/REACH compliance documentation if supplying to regulated markets.
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