DS1302 real time clock module parameters are as follows:

• PCB single panel, size: 44mm * 23mm * 1.6mm
• With four positioning holes, diameter 3.1mm
• Backup battery is genuine celestial CR2025, Voltage 3V, current 260mAh, non-rechargeable batteries. Theoretical data retention time is more than 10 years!
• Crystal 32.768KHz, Japan imported crystal, matching capacitance 6pF, size 2 * 6mm
• DS1302 is made large 8-pin DIP chip, chip below IC socket for easy replacement and swap chips
• Module operating voltage compatible 3.3V/5V, can be connected with 5V and 3.3V microcontroller
• Working temperature: 0 ° --- 70 °

Wiring methods (procedures in order to provide an example, you can access any IO port, modify the port definition in the program can be):
VCC → +5 V/3.3V
GND → GND
CLK → P02
DAT → P01
RST → P00

Note:

1. VCC and GND Do not reversed, it would burn the chip

2. 51 MCU P0 port requires pull-up resistor

Package Includes

• 1 x DS1302 real time clock module with battery CR2025