DS1302 real-time clock module with battery CR2032 power-down travel promotions

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 DS1302 real-time clock module

DS1302 is DALLAS company launched trickle charge clock chip, contains a real-time clock / calendar and 31 bytes of static RAM, through a simple serial interface to communicate with the microcontroller. Real-time clock / calendar circuit provides seconds, minutes, hours, days, weeks, months, years of information, the number of days per month and leap year days can be automatically adjusted. The clock operation can be determined by the AM / PM indication in 24 or 12 hour format. DS1302 and single-chip can be used directly between the synchronous serial communication, only need to use three lines: (1) RST reset (2) I / O data line (3) SCLK serial clock. The read / write data of the clock / RAM is communicated with a byte or up to 31 bytes of character groups. DS1302 low power consumption while maintaining data and clock information when the power is less than 1mW

DS1302 main performance indicators: real-time clock with the ability to calculate before 2100, minutes, hours, days, weeks, months, years of ability, as well as leap year adjustment ability 31 8-bit temporary data storage RAM serial I / O port mode makes the minimum number of pins Wide operating voltage 2.0 5.5V working current 2.0V, less than 300nA read / write clock or RAM data when there are two kinds of transmission mode single byte transmission and multi-byte transmission character group mode 8-pin DIP package or optional 8-pin SOIC package according to surface mount simple 3-wire interface Compatible with TTL Vcc = 5V Optional industrial temperature range -40 +85 Dual power supply for mains and backup power supplies DS1302 real-time clock module parameters are as follows:

1.PCB is a single panel, size: 44mm * 23mm * 1.6mm

2. With 4 positioning holes, diameter 3.1mm

3. Backup battery for the genuine celestial ball 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 straight-made large chip, the chip below the IC block, easy to replace and plug the chip

6. Module operating voltage compatible with 3.3V / 5V, 5V and 3.3V microcontroller can be connected

7. Operating temperature: 0 ° --- 70 °

Wiring method (to provide the program as an example, you can take any IO port, in the process of modifying the port can be defined):

VCC + 5V / 3.3V

GND GND

CLK P02

DAT P01

RST P00

Precautions:

1.VCC and GND do not reverse, so as not to burn the chip

2.51 microcontroller P0 port need to pull on the resistor, if your microcontroller is not connected to the pull-up resistor, you can connect the data cable to other ports

 Shipping list:

1.DS1302 real-time clock module 1 (with DS1302 chip and spare battery, before the test has been tested good function)