Tiny RTC Real Time Clock DS1307 I2C IIC Module

Tiny RTC Real Time Clock DS1307 I2C IIC Module for Arduino provides a highly efficient and reliable way to maintain accurate time and date information for your microcontroller projects. This compact module utilizes the DS1307 serial real-time clock chip, which manages seconds, minutes, hours, day, date, month, and year data automatically. Furthermore, it includes a dedicated battery backup slot to ensure the clock continues running even when the primary system power fails. The module also features a 24C32 32K I2C EEPROM, which allows users to store non-volatile data alongside the timekeeping functions. Consequently, this board serves as a dual-purpose solution for timing and small-scale data logging. Therefore, you can easily integrate this module into any Arduino or Raspberry Pi project to achieve precise scheduling and time-stamped data collection.

Key Features:

• Accurate Timekeeping: The DS1307 chip tracks full calendar and clock functions, including leap year compensation valid up to the year 2100.
• I2C Serial Interface: The module uses the standard 2-wire I2C protocol, which significantly reduces the number of pins required for communication with the host MCU.
• Battery Backup Support: It features a CR2032 battery holder to preserve time data during power outages, ensuring your system resumes with the correct time immediately upon restart.
• Onboard EEPROM: Includes an AT24C32 32Kbit memory chip, providing a convenient space for storing system settings or log data without utilizing the MCU’s internal memory.
• Programmable Square-Wave Output: The module can generate a square-wave signal at various frequencies, which is useful for triggering external interrupts or system heartbeats.

Technical Specifications:

• Operating Voltage: 4.5 V to 5.5 V DC
• Clock Chip: DS1307
• Communication Protocol: I2C (Serial Clock and Serial Data)
• EEPROM Chip: AT24C32 (32K Storage capacity)
• Data Retention: Minimum 10 years of life with a fully charged battery backup.
• Accuracy: Dependent on the external 32.768 kHz crystal oscillator stability.
• Operating Temperature: 0°C to +70°C

Mechanical Specifications:

• Mounting: Two 3mm mounting holes for secure attachment to enclosures or chassis.
• Pin Headers: Standard 2.54 mm pitch through-hole headers for breadboard and jumper wire compatibility.
• Battery Socket: Integrated CR2032 coin cell holder.
• Soldering: Pre-soldered components with clear silk-screen labeling for easy identification.

Dimensions:

• Module Length: ≈ 27 mm
• Module Width: ≈ 28 mm
• Module Height: ≈ 8.4 mm (including battery holder)
• Weight: ≈ 5 g (without battery)

Pinout and Wiring:

• VCC: Connect to the 5V power supply of the Arduino or MCU.
• GND: Connect to the common ground of the circuit.
• SDA: I2C Data line. Connect to the SDA pin of your microcontroller (A4 on Arduino Uno).
• SCL: I2C Clock line. Connect to the SCL pin of your microcontroller (A5 on Arduino Uno).
• SQ: Square-wave output pin for external frequency generation (optional).
• DS: Temperature sensor input (specific versions include a DS18B20 pads, though not always populated).

Datasheet Reference:

• Download DS1307 Real Time Clock Datasheet

Commonly Used in:

• Arduino Development Kits: A staple component for learning I2C communication and time-based programming.
• Data Loggers: Widely used to add precise time-stamps to environmental or industrial sensor readings.
• Digital Clocks: The primary time-base for DIY wall clocks, alarm clocks, and desktop calendars.

Applications:

• Automated Scheduling: Activating irrigation systems, lighting, or appliances at specific times of the day.
• Event Time-Stamping: Recording the exact moment a security sensor triggers or a button is pressed.
• Energy Management: Scheduling low-power modes for battery-operated devices during nighttime hours.

Equivalent Models:

• DS3231 RTC Module: A higher precision alternative that features an integrated temperature-compensated crystal oscillator.
• PCF8563 RTC: A low-power CMOS real-time clock and timer suitable for mobile applications.
• DS1302 Module: A simpler RTC that uses a 3-wire synchronous interface instead of I2C.

Package Includes:

• 1 x Tiny RTC Real Time Clock DS1307 I2C IIC Module