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BUY DS1602 https://www.utsource.net/itm/p/112588.html
Elapsed Time Counter
Description: The DS1602 is a Real-Time Clock (RTC) IC from Dallas Semiconductor. Features: - Low power CMOS technology - Operating voltage range of 2.0V to 5.5V - Operating temperature range of -40°C to +85°C - High accuracy timekeeping - Programmable alarm - Battery backup - I2C or SPI interface Applications: - Automotive - Industrial - Medical - Home appliances - Wearable devices - Smart meters - Security systems (For reference only)