Instruction

This tiny RTC(Real-Time Clock) module is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR1225),the frequency is 32.768KHz(same frequency used in quartz clocks and watches). 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.

Features

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

56-Byte, Battery-Backed, Nonvolatile (NV)RAM for data storage

Resource

Program

Schematic

Datasheet