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The DS1307CDRG: The Ultimate Guide to the 7-Bit Addressable I²C Real-Time Clock Chip

Introduction

The DS1307CDRG is a low-power, 7-bit addressable I²C real-time clock (RTC) chip from Maxim Integrated. Specifically designed for quartz-controlled applications, the DS1307CDRG offers a full range of features for precise timekeeping applications.

Key Features

7-bit I²C interface for easy communication
Pin-selectable I²C address (0x68 or 0x69)
Accuracy of ±2 minutes/year
Built-in 32.768 kHz crystal oscillator
56-byte non-volatile memory for data storage
Programmable alarm and timer
Low power consumption (250 nA in standby mode)

Applications

The DS1307CDRG finds applications in a wide range of devices, including:

Industrial and automotive applications
Data loggers and time-stamping devices
IoT devices and smart home appliances
Medical and laboratory equipment

Benefits

Accurate timekeeping with precise accuracy of ±2 minutes/year
Low-power consumption, extending battery life
Easy integration with I²C devices
Customizable settings with programmable alarm and timer
Reliable operation in various conditions

Technical Specifications

Specification	Value
Supply Voltage	2.0V to 3.5V
I²C Clock Frequency	100 kHz to 400 kHz
Accuracy	±2 minutes/year
Memory Size	56 bytes
Alarm and Timer	Programmable

Pin Configuration

Pin	Name	Description
VCC	Power Supply	Supplies power to the chip
GND	Ground	Ground reference
SCL	Serial Clock	I²C clock line
SDA	Serial Data	I²C data line
X1	External Clock	Input for connecting an external oscillator
X2	External Clock	Output from the internal oscillator

I²C Communication

The DS1307CDRG communicates over the I²C bus using a 7-bit address. The default address is 0x68, but it can be changed to 0x69 by tying the A0 pin to VCC.

Setting the Time and Date

To set the time and date, write the following data to the chip's registers:

DS1307CDRG

The DS1307CDRG: The Ultimate Guide to the 7-Bit Addressable I²C Real-Time Clock Chip

Seconds: Register 0x00
Minutes: Register 0x01
Hours: Register 0x02 (12/24 hour format)
Day: Register 0x03
Date: Register 0x04
Month: Register 0x05
Year: Register 0x06

Reading the Time and Date

To read the time and date, read the following registers:

Seconds: Register 0x00
Minutes: Register 0x01
Hours: Register 0x02 (12/24 hour format)
Day: Register 0x03
Date: Register 0x04
Month: Register 0x05
Year: Register 0x06

Alarm and Timer

The DS1307CDRG features a programmable alarm and timer. The alarm can be configured to interrupt the host at a specific time. The timer can be programmed to generate a square wave output.

Real-World Applications

The DS1307CDRG is a versatile chip that can be used in a wide variety of real-world applications, including:

Industrial: Timekeeping in factory automation systems, data loggers, and monitoring devices
Automotive: Real-time clock for vehicle infotainment systems, navigation systems, and driver assistance features
Consumer: Timekeeping in smart home appliances, IoT devices, and wearable devices
Medical: Time-stamping medical records, monitoring patient vitals, and tracking medication schedules

Tips and Tricks

Use a pull-up resistor on the I²C lines to improve communication stability.
Set the I²C clock frequency to 100 kHz for optimal performance.
Store important data in the non-volatile memory to prevent data loss during power failures.

Where to Buy

The DS1307CDRG is available from a wide range of distributors, including:

Introduction

Seconds:

Digi-Key
Mouser
Arrow Electronics
Farnell

Conclusion

The DS1307CDRG is an essential component for a wide range of real-time clock applications. Its accuracy, low power consumption, and ease of use make it an excellent choice for a variety of devices.