DS1307N Real Time Clock COM22

DescriptionIf you are designing an IoT weather station that needs to accurately time-stamp sensor readings, or teaching students how to build their own digital alarm clocks in an electronics training program, you need a Real-Time Clock. The DS1307 RTC IC is the industry standard for adding low-cost, reliable timekeeping to embedded systems.The Battery Backup AdvantageThe standout feature of the DS1307 is its VBAT pin. While the chip normally runs on your system’s 5V power supply, you can connect a standard 3V lithium coin cell battery (like a CR2032) to the VBAT pin. The chip features intelligent automatic power-fail circuitry. The millisecond your main power goes out, the DS1307 seamlessly switches over to the coin cell, keeping the clock ticking in the background for years. When power is restored, your Arduino simply asks the chip for the time, and it picks up exactly where it left off.Simple I2C CommunicationYou do not need to waste valuable digital pins to read the time. The DS1307 uses the I2C (Inter-Integrated Circuit) protocol, requiring only two pins: SDA (Data) and SCL (Clock). Multiple I2C devices (like LCD screens and pressure sensors) can share these exact same two pins alongside the RTC.Built-In RAMAs a bonus, the DS1307 includes 56 bytes of Non-Volatile (NV) RAM. You can use this extra memory space to store alarm settings, user preferences, or state variables. Because it is tied to the battery backup system, this data remains safe even if the main power is cut.Key Features:Complete Timekeeping: Counts seconds, minutes, hours, date, month, day of the week, and year.Leap Year Compensation: Automatically adjusts for 28, 29, 30, and 31-day months (valid up to the year 2100).AM/PM or 24-Hour: Can be configured to output time in either 12-hour or 24-hour formats.Programmable Square Wave: Features an output pin that can generate a precise 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz square wave for triggering interrupts.Technical Specifications:Logic Family: CMOSOperating Supply Voltage (VCC): 4.5V to 5.5V DCBattery Backup Voltage (VBAT): 2.0V to 3.5V DCActive Supply Current: ~1.5mAStandby Battery Current: < 500nACommunication Interface: I2C (Address 0x68)Package Type: 8-Pin DIP (Through-hole)Ideal Applications:DIY digital clocks, alarm systems, and timersTime-stamping data in environmental loggers and IoT edge devicesTime-of-day triggered automated relays (e.g., turning on garden lights at exactly 18:00)Educational breadboard kits for teaching I2C serial communicationUsage Tip: The DS1307 requires a watch-style 32.768 kHz Quartz Crystal connected between pins 1 and 2 to function. It will not keep time without this crystal. Additionally, remember to add 4.7kΩ or 10kΩ pull-up resistors to your SDA and SCL lines for reliable I2C communication.