BRAND: Communica

DS1302 Real Time Clock module with Backup Battery CR1220 and Battery Holder


DS1302 DALLAS introduced trickle charge clock chip contains a real-time clock / calendar and 31 bytes of static RAM, communicate via a simple serial interface with microcontroller. Real-time clock / calendar circuit provides a second, minute, hour, day, week, month, year, the monthly number of days and a leap year, the number of days can be automatically adjusted. The clock can be done by the AM / PM indicator decided to use 24 or 12-hour format

DS1302 between the microcontroller and simple synchronous serial communication only used three-port line: (1) RST Reset (2) I / O data lines (3) SCLK serial clock. Clock / RAM read / write data to a byte or character group by up to 31 bytes of communication. The DS1302 Low power consumption to maintain data and clock information when the power is less than 1mW


  • Real-time clock can calculate the year 2100 second, minute, hour, day, week, month, year capacity, as well as the ability to leap year adjustment
  • 31 x 8 temporary data storage RAM
  • Serial I / O port such a way that the minimum number of pins
  • Wide operating voltage range 2.0 5.5
  • 2.0V operating current of less than 300nA
  • Read / write clock or RAM data transmission and multi-byte transfer of single-byte characters burst mode of transmission in two ways
  • 8-pin DIP
  • Simple 3-wire interface
  • Vcc = 5V TTL-compatible
  • Optional industrial temperature range -40 +85degC
  • Dual-supply pipe for the main power supply and backup power supply


  • PCB standard double-sided, full-chip design, beautiful atmosphere, size 47mmx18mm:
  • With a positioning hole diameter 3mm, convenient fixed
  • CR1220 battery holder. Battery Included
  • Crystal 32.768KHz
  • DS1302 SO-8 package patch made large chip
  • Module operating voltage compatible 3.3V/5V connection with 5V and 3.3V microcontroller
  • Operating Temperature: 0~70°C
  • With power indicator light