RTC Time EEPROM Charging Reseved DS18B20 Module, DS1307, I2C

Description Module Feature: DS1307 I2C real-time clock chip (RTC) 24C32 32K I2C EEPROM memory On board lithium battery charging circuit NOT include coin battery (forbidden by shipment rules) you need to buy LIR2032 battery alone to use. When board is powered, battery will be charged, need about 5-6 hours. Fully charged, it can provide 1 year lifetime. Reserved DS18B20 socket. Compact design, 27mm * 28mm * 8.4mm Leads to the a DS1307 clock pin, to provide the clock signal for the MCU. Can be cascaded to other I2C devices. About DS1307 DS1307 is a low power, with 56 bytes of non-volatile RAM BCD code clock calendar real-time clock chip, the address and data transmission through the two-wire bidirectional serial bus, the chip can be seconds, minutes, hours and other information , the number of days in each month can be adjusted automatically. And there is a leap year compensation function. AM / PM flag determines clock work 24-hour or 12-hour mode, the chip has a built-in power-sense circuit, brownout detection and battery switching function. DS1307 features: Can account seconds, hours, minutes, monthly number of days, months, days of the week count with leap year compensation function. Record the year on line 2100. 56 bytes of non-volatile RAM Two-wire serial interface Programmable square-wave output Automatic power-down detection and switching circuit In battery backup mode, power consumption is less than 500nA Wiki Page information here.