Battery may not included for DHL shipment methods, due to the airplane shipment restriction.

A lot of domestic appliance need a RTC, like you know, the weight calculate, refrigerator,  clock, coffee machine, well anywhere you can find a time when you don’t have a watch and no power on your phone 😀

DS1302 Introduction:

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 * 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 or optional 8-pin SOIC package surface mount
  • Simple 3-wire interface
  • Vcc = 5V TTL-compatible
  • Optional industrial temperature range -40 85
  • Dual-supply pipe for the main power supply and backup power supply

Module Specification:

  • PCB standard double-sided, full-chip design, beautiful atmosphere, size 4.7cm * 1.8cm:
  • With a positioning hole diameter 3mm, convenient fixed;
  • Backup battery for authentic CR1220 battery voltage is 3V, non-rechargeable battery.
  • 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 °
  • With power indicator light


Shipping Note:

This product contains battery, will be only possible to be shipped by normal shipping service like Hongkong post, Belgium post, or similar, but not possible to be shipped by FedEx, DHL, UPS, read more on

Additional information

Weight 0.01 kg


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