DS1302 Real Time Clock Module no Battery

. PCB for the single-panel, size: 50mm*21mm*12 mm 2. With 4 positioning holes, diameter 3.1mm 3. Backup battery for the authentic celestial sphere CR2032, voltage 3V, current 260mAh, non-rechargeable battery. Theoretical data retention time greater than 10 years 4. Crystal 32.768KHz, Japan imported crystal, matching capacitance of 6pF, size 2 * 6mm 5.DS1302 8-pin plug-in large chip made, the chip below IC block, easy to replace and plug the chip 6. Module operating voltage is compatible with 3.3V / 5V, and 5V and 3.3V single-chip connection 7. Operating temperature: 0 °— 70 ° Description: 1. Real-time clock with 2100 can be calculated before the seconds, minutes, hours, days, weeks, months, years of ability, as well as leap year adjustment 2. 31 8-bit temporary data storage RAM 3. Serial I / O port mode makes the pin count the least 4. Wide operating voltage 2.0V 5. Working current 2.0V, less than 300mA 6. Read / write clock or RAM data, there are two transfer methods single byte transfer and multi-byte transmission character group mode 7. 3-wire interface compatible with TTL Vcc = 5V 8. Optional industrial temperature range -40 +85 9. Dual power supply for the main power supply and backup power supply