Grove Real Time Clock DS1307

Grove - DS1307 RTC is based on the clock chip DS1307 and supports I2C communication! It uses a Lithium cell battery (CR1225). We choose to use the RTC based on DS1307 as it is low-cost and energy efficient. It can run for years on a very small coin cell. The RTC module is based on the clock chip DS1307, which supports the I2C protocol. It utilizes a Lithium cell battery (CR1225). The clock/calendar provides seconds, minutes, hours, days, dates, months, and years. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for leap years. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. And it is valid up to 2100. In order to gain a robust performance, you must put a 3-Volt CR1225 lithium cell in the battery holder. The DS1307 has a built-in power sense circuit that detects power failures and automatically switches to the battery supply. If you use the primary power only, the module may not work normally,