DS1307 RTC Clock Module

The DS1307 RTC Clock Module is a low-power, full binary-coded decimal (BCD) real-time clock that keeps track of seconds, minutes, hours, day, date, month, and year. It communicates with microcontrollers via the I²C interface and continues to maintain accurate time even when the main power supply is turned off, thanks to its onboard backup battery support.

This module is widely used in Arduino, Raspberry Pi, and embedded system projects where precise timekeeping is required.

Key Features

• Real-Time Clock with calendar function

• Keeps time in seconds, minutes, hours, day, date, month & year

• Automatic leap-year compensation (valid up to 2100)

• I²C communication interface (simple two-wire protocol)

• Supports 12-hour and 24-hour formats

• Battery backup (CR2032 coin cell supported)

• Onboard 32.768 kHz crystal oscillator

• Low power consumption

• Non-volatile memory for timekeeping

Technical Specifications

• RTC IC: DS1307

• Operating Voltage: 5V DC

• Backup Battery: 3V CR2032 (not always included)

• Communication Protocol: I²C

• Clock Accuracy: ±2 minutes/month (typical)

• Operating Temperature: 0°C to +70°C

• Board Size: Compact PCB design for easy integration

Applications

• Digital clocks

• Data logging systems

• Time-based automation projects

• Attendance systems

• Alarm and timer circuits

• Embedded systems & IoT projects

• Arduino and Raspberry Pi projects

Pin Description

• VCC – Power supply (5V)

• GND – Ground

• SDA – I²C Data line

• SCL – I²C Clock line

Package Includes

• 1 × DS1307 RTC Clock Module

• (Battery may or may not be included — specify clearly on your site)

Why Choose This Module?

•  Reliable and accurate timekeeping
•  Easy to interface with microcontrollers
•  Backup battery ensures no data loss
•  Ideal for beginners and professionals