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Real time clock (RTC) module PCF8523. It uses the STEMMA QT connector and communicates via the I2C interface. Adafruit 5189
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Real time clock (RTC) module PCF8523. It uses a 32.768 kHz oscillator and offers an accuracy of 2 seconds/day. The clock counts seconds, minutes, hours, day of the month, month, day of the week and year with leap year compensation. It has a programmable alarm built in. There is a CR1220 battery socket on the board. It is powered with the voltage from 3 V to 5 V, and communication is via the I2C interface (STEMMA QT connector). Full documentation is available on the product page.
Lithium Coin Cell Battery, 3V, 12x2mm
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Real time clock (RTC) module PCF8523. It uses the STEMMA QT connector and communicates via the I2C interface. Adafruit 5189