DS1302 is trickle charge the clock chip introduced  by DALLAS , containing a real-time clock / calendar and 31 bytes of static RAM, communicates via a simple serial interface to the microcontroller.<br />DS1302 Key performance indicators:<br />★ real-time clock can be calculated in 2100 before having a second, minute, hour, day, week, month, year capacity, as well as the ability to leap year adjustment<br />★ 31 8 位 temporary data storage RAM<br />★ serial I / O port mode makes the least number of pins<br />★ wide range of operating voltage 2.0 5.5V<br />★ When working current 2.0V, less than 300nA<br />★ There are two transfer mode single byte transfer and multi-byte transfer mode burst read / write clock or RAM data<br />★ 8-pin DIP package or optional 8-pin SOIC package assembly according to the surface<br />★ simple 3-wire interface<br />★ compatible with TTL Vcc = 5V<br />★ Optional industrial temperature range of -40 to +85<br />★ dual supply pipe for the main power supply and backup power supply<br />DS1302 real-time clock module parameters are as follows:<br /><br />1.PCB single panel, size: 44mm * 23mm * 1.2mm<br /><br />2. With four positioning hole diameter 3.1mm<br /><br />3. The backup battery is genuine celestial CR2032, Voltage 3V, current 260mAh, non-rechargeable batteries. Theoretical data more than 10 years!<br /><br />4. Crystal 32.768KHz, Japan imported crystal, matching capacitance 6pF, size 2 * 6mm<br /><br />5.8 foot line made large chip, chip IC Block below for easy replacement and plug the chip<br /><br />DS1302 clock module * 1 (with battery CR2032 * 1)<br />Static bag<br /><img src="//agdetail.image-gmkt.com/m430/958/476/558476958/img/agdetail.image-gmkt.com/958/476/558476958/img/img6.eachbuyer.com/x9/p100/eb4340_1.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/958/476/558476958/img/agdetail.image-gmkt.com/958/476/558476958/img/img6.eachbuyer.com/x9/p100/eb4340_2.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/958/476/558476958/img/agdetail.image-gmkt.com/958/476/558476958/img/img6.eachbuyer.com/x9/p100/eb4340_3.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/958/476/558476958/img/agdetail.image-gmkt.com/958/476/558476958/img/img6.eachbuyer.com/x9/p100/eb4340_4.jpg" />