DS1307 I2C Real Time Clock Module with 24C32 EEPROM and Battery Backup

The DS1307 is a low-power serial real-time clock (RTC) module that provides accurate timekeeping for microcontroller and IoT projects. It communicates over the I2C bus and keeps track of seconds, minutes, hours, day of the week, date, month, and year, with automatic leap-year compensation valid up to 2100. The module includes 56 bytes of non-volatile SRAM and an onboard 24C32 EEPROM with 32 KB of storage capacity, giving users additional space for data logging or configuration parameters. It operates from a 5V supply and uses an external 32.768kHz crystal for timekeeping; the oscillator circuit requires no external resistors or capacitors.

The DS1307 RTC module features automatic power-fail detection that switches to a backup battery when the main supply is interrupted, allowing the clock to continue running. It supports both 12-hour and 24-hour formats with AM/PM indication and provides a programmable square-wave output. The board has compact dimensions of 27 × 28 × 8.4 mm and an operating temperature range of -40°C to +85°C, making it suitable for a wide range of environmental conditions. This I2C real time clock module is compatible with Arduino, ESP32, and other microcontrollers, and is well suited to applications such as timers, event logging, alarms, and data-recording systems.

1. Accurate timers and alarm systems.
2. Event logging and data-recording projects.
3. IoT devices requiring time-stamped data.
4. Arduino, ESP32, and other microcontroller-based clock applications.
5. Battery-backed timekeeping in systems subject to power interruptions.

1. Model: DS1307.
2. Interface: I2C serial bus.
3. Timekeeping format: 12-hour (AM/PM) or 24-hour.
4. Calendar: seconds, minutes, hours, day, date, month, year.
5. Leap-year compensation: valid up to 2100.
6. Non-volatile SRAM: 56 bytes.
7. Onboard EEPROM: 24C32, 32 KB.
8. Crystal frequency: 32.768kHz (external, no external resistors or capacitors required).
9. Supply voltage: 5V DC.
10. Operating temperature range: -40°C to +85°C.
11. Dimensions (L × W × H): 27 × 28 × 8.4 mm.
12. Output: programmable square-wave output.