Real Time Clock module

Description

A Real Time Clock Module with battery backup using the easy to use DS1302 chip. The DS1302 chip uses a simple serial interface (see datasheet) and example code is available for Arduino, Raspberry Pi and many others.
Features
• Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
• Serial I/O for Minimum Pin Count
• 2.0V to 5.5V Full Operation
• Uses Less than 300nA at 2.0V
• Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock or RAM Data
• Board Size: 44mm x 24mm