DS1307 RTC Module

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2 Features and Specifications of DS1307 RTC Module

Overview

The DS1307 RTC module basically is a time-tracking device that gives the current information and time. RT means Real-Time Clock. They make the RTC module with clock chip DS1307. We generally need this module in computers, laptops, or any other embedded systems or devices to provide time and date. RTC module functions on the I2C protocol. The module provides information like an hour, minute, second, day, year, etc. One can use it with any of the formats, either 24hr or 12hr.

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Hardware Overview

RTC chip: At the center of the module there is a low-cost RTC chip DS1307. It deals with all timekeeping functions and features.
SQW pin: This module board comes with an SQW pin, which yields one of four frequencies (1Hz, 4kHz, 8kHz, or 32kHz) of square waves. This can be enabled through programming.
EEPROM chip: DS1307 module also has a 32 bytes 24C32 EEPROM chip with limited read-write cycles. It can save settings. It I2C interface for communication
Battery Holder: There is a CR2032 battery with a capacity 47mAh.

Features and Specifications of DS1307 RTC Module

Features

Available in 8-pin DIP or SOIC
Underwriters Laboratory (UL) recognized
Real-time clock (RTC) counts seconds, minutes, hours, dates of the month, month, day of the week, and year with leap-year compensation valid up to 2100
56-byte non-volatile RAM for data storage
Two-wire interface (I2C)
Completely Manages All Timekeeping Functions
Programmable Square-Wave Output Signal
Simple Serial Port Interfaces to Most Microcontrollers
I2C Serial Interface
Low Power Operation Extends Battery Backup Run Time
Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running
Automatic Power-Fail Detect and Switch Circuitry

Specifications

Range of Operating Voltage	3.3V – 5V
Typical voltage supply	5V
Real-Time lock chip	DS1307 I2C
EEPROM Chip	AT24C32 32K I2C EEPROM memory
Battery type	LIR2032 rechargeable lithium battery
Power consumption	It operated on a battery then it consumes less than 500 nA of power.
Clock Provide	Hour, Minutes, Seconds, AM/PM.
Calendar provides	Day, Date, Month, Year.
PCB Size	27mm * 28mm * 8.4mm (LWH)

Pinouts of DS1307 RTC Module

Pin Name	Description
SQW	The SQW pin has a cool feature, it can produce outputs one of four square-wave frequencies 1 Hz, 4 kHz, 8 kHz, or 32 kHz, and can be possible programmatically.
DS	This pin is used to read Output from the DS18B20 temperature sensor if the RTC module has a DS18B20 temperature sensor installed.
SCL	This is a clock-input I2C serial communication pin. It is used to synchronize data movement on the serial interface.
SDA	We use this pin for the data input/output for the I2C serial interface.
VCC	It is a positive power input pin of the module in the range of 3.3V to 5.5V.
GND	GND is a negative(ground) power input pin
BAT	BAT pin is a backup supply input for any standard 3V lithium cell or other energy sources to maintain accurate timekeeping when the main power to the device is interrupted.

Applications of RTC Module

Digital Clocks

The real-time digital clocks present information about the hours, months, dates, years, etc, and can be operated in 24hr or 12 hr format with an indicator of AM and PM. Hence. it can employ this RTC module to serve the purpose.