RTC DS1302 Real Time Clock Module has the ability to calculate the prior to the 2100 second, minute, hour, day, week, month, and year and has the ability to adjust for a leap year. – Wide working voltage: 2.0–5.5 V
When the working voltage is 2.0 V, the current is less than 300 nA. Read/write clock or RAM data have two transmission ways: Single – byte/many bytes group 8 feet to 8 feet DIP the assembly or optional SOIC encapsulation “according to the surface of the assembly.

Between DS1302 and a single-chip microcomputer, you can simply use the synchronous serial communication method, which has only three lines:
(1) RST
(2) I/O reset the data line
(3) SCLK serial clock

Clock and RAM read and write data to a byte character set or as many as 31 bytes of communication.

• VCC:+5V/3.3V
• GND: GND
• CLK: P02
• DAT: P01
• RST: P00

Note:

       1. VCC and GND do not reverse, so as not to burn the chip.
       2.51 SCM P0 port to receive a pull-up resistor; if your computer does not have a pull-up resistor connected, the data can be sent over the string to the other port.

Package Included:

• 1 x RTC DS1302 Real Time Clock Module

Specifications and Features:

The real-time clock counts minutes, seconds, dates, hours, month, day of the week, year, and leap-year compensation up to 2100.

1. 318 temporary data storage RAM
2. working current of 2.0V, less than 300nA
3. Read and write clock or RAM data with two kinds of modes: single-byte transfer mode and multi-byte character set.
4. 8-pin DIP package or optional 8-pin SOIC package based on the surface assembly
5. Simple 3-wire interface
6. Compatible with TTL Vcc = 5V
7. Double power supply pipe for main power and backup power.