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• Isis Schematic File
• Proteus Isis Schematic Capture Free Download
• Isis Schematic
• Isis Schematic Capture

DS1302 is a real-time clock capable of counting seconds, minutes, hours, date, month, day of the week and year up to 2100. The leap year compensation is made to incorporate internally. The static RAM DS1302 is of 31 Bytes. A simple serial SPI interface makes DS1302 communicate and interact with any microprocessor or microcontroller having an SPI communication interface. There are two forms of time indication i.e. 24 hours format or 12 hours with an indication of AM/PM. It operates on very low power. Retention of data and clock information can only take 1µW at most. Synchronous serial communication is used for connecting this RTC chip with a microprocessor. RST (reset), I/O (data line) and SCLK (serial clock) are the three terminals required for communication with DS1302. Single byte or multiple byte mode are utilized for data transferring to or from clock or RAM.

DS1302 Pinout Diagram

DS1302 is available as an 8-pin IC. Its pinout diagram is shown as:

Pin Configuration Details

Where and How to Use DS1302 RTC Chip?

DS1302 has shift register, control logic, oscillator, real-time clock and RAM as the main constituents of timekeeping through SPI serial communication. The block diagram is correspondingly shown as:

Isis Schematic File

DS1302 Example

A typical application of DS1302 example is shown as:

The crystal oscillator is connected between pin X1 and X2. Power supplies are connected to V_CC2 and V_CC1. DS1302 actually operates on any of the two i.e. V_CC2 and V_CC1 depending on the magnitude of a higher one. V_CC2 acts as a primary power source if V_CC2 > V_CC1 + 2 . if V_CC2 < V_CC1 + 2 , V_CC1 acts as a power source.Pin no. 4 is grounded. The serial communication occurs through pins 4, 5 and 6 as shown above.

Each data transfer starts with a command byte. The MSB determines whether writes to DS1302 are possible or not. If this MSB i.e. bit no 7 is 1 writes to DS1302 is enabled and if its logic 0 writes to DS1302 is disabled. 0 zero logic on bit no. 6 determines clock or calendar data while logic shows RAM data. Bit no. 1 to 5 regards data registers to be input or output. Logic 0 at bit 0 I.e. LSB shows wrote operation and logic 1 shows read operation. This is depicted as:

Applications

The applications of DS1302 include incorporated digital clocks/ timers of various modules in our real lives.

Other equivalents ICs of RTC are: DS1307, DS3231, DS3232

DS1302 interfacing with Arduino

Proteus Isis Schematic Capture Free Download

In this section, we will see an example of interfacing RTC chip with Arduino Uno. We will need an external crystal and a lithium battery to use this IC. Instead of purchasing this IC alone, there are many RTC modules available in the market. You can buy a DS1302 RTC module. Picture of module is shown here:

Isis Schematic

Real-time Chip Features

Isis Schematic Capture

The operational features of DS1302 are shown as: