Adafruit PCF8523 Real Time Clock Breakout Board

Key Features Equipped with PCF8523 RTC - it can run from 3.3V or 5V power & logic! Perfect for data-logging, clock-building, time stamping, timers, and alarms, etc Simple and inexpensive but not a high-precision device Will keep time for 5 years or more This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for data-logging, clock-building, time stamping, timers, and alarms, etc. Equipped with PCF8523 RTC - it can run from 3.3V or 5V power & logic!We've had a breakout board version of this RTC for a while, but we want to make it even easier for folks to use, so now it comes with STEMMA QT connectors for plug-and-play simplicity.Works great with an Arduino using Adafruit's RTC library, with CircuitPython, or with a Raspberry Pi (or similar single board linux computer)Item SpecificsThis board/chip uses I2C 7-bit address 0x68Dimensions: 25.4mm x 17.8mm x 7.8mm / 1.0" x 0.7" x 0.3"Weight: 1.5g / 0.1ozPCB & header are includedPlugs into any breadboard, or you can use wiresTwo mounting holesNote: This product does not come with a CR1220 coin cell battery.