The RTC module is a member of Twig. It is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR1225). The clock/calendar provides seconds, minutes, hours, day, date,month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Note : Battery is not included. Features Real-Time Clock (RTC) counts seconds,minutes, hours, date of the month, month,day of the week, and year with Leap-Year compensation valid up to 2100 56-Byte, Battery-Backed, Nonvolatile (NV)RAM for data storage I2C serial interface 5V DC supply Programmable Square-Wave output signal Automatic Power-Fail detect and switch circuitry Consumes less than 500nA in Battery-Backup Mode with Oscillator Running Application Ideas Calendar Intelligent instrument Industrial control Cautions In order to gain a robust performance, you must put a 3-Volt CR1225 lithium cell in the battery-holder. If you use the primary power only, the module may not work normally, because the crystal may not oscillate. Documents Please visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials
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