DS1302 Real-Time Clock Module for Arduino & Microcontrollers

Overview: The DS1302 Real-Time Clock (RTC) module is an essential component for projects requiring accurate timekeeping, even when the main power supply is off. Powered by a DALLAS trickle-charge clock chip, it features a real-time clock/calendar and 31 bytes of static RAM. It communicates with microcontrollers via a simple 3-wire serial interface, making it perfect for Arduino and other DIY electronics projects.

Key Features:

• Precise Timekeeping: Provides seconds, minutes, hours, day, week, month, and year information, automatically adjusting for days per month and leap years (up to 2100).
• Integrated RAM: Includes 31 bytes of 8-bit static RAM for temporary data storage.
• Simple 3-Wire Interface: Easy communication with microcontrollers using RST (Reset), I/O (Data Line), and SCLK (Serial Clock) pins.
• Wide Operating Voltage: Compatible with 2.0V to 5V systems.
• Ultra-Low Power Consumption: Operates at less than 300nA at 2.0V, ensuring long data and clock retention with backup power (less than 1mW).
• Flexible Data Transfer: Supports single-byte and multi-byte (character group) transfers for clock or RAM data.
• DIP-8 Package: Features an 8-pin plug-in large chip (DS1302) with an IC Block for easy replacement.
• Robust Design: Includes a high-quality 32.768KHz imported crystal (Japan) and a reliable CR2032 backup battery.

Technical Specifications:

• PCB Size: 44mm x 23mm x 1.6mm
• Mounting: 4 positioning holes, diameter 3.1mm
• Backup Battery: Authentic celestial sphere CR2032 (3V, 260mAh, non-rechargeable). Theoretical data retention: >10 years.
• Crystal Oscillator: 32.768KHz, 6pF matching capacitance, 2x6mm size.
• IC: DS1302 (8-pin plug-in)
• Operating Voltage: 3.3V / 5V compatible
• Operating Temperature: 0°C to 70°C

Wiring Method (Example for Arduino/Microcontroller):

• VCC: Connect to +5V / 3.3V
• GND: Connect to GND
• CLK: Connect to Digital Pin (e.g., P02)
• DAT: Connect to Digital Pin (e.g., P01)
• RST: Connect to Digital Pin (e.g., P00) (Note: Pin definitions can be modified in your program.)

Package Includes:

• 1 x DS1302 Real-Time Clock Module
• 1 x CR2032 Battery