The RTC DS1302 Real Time Clock Module is a compact, batterybacked timekeeping solution designed for AVR, ARM, and PIC microcontroller projects. It uses the DS1302 real time clock IC and provides a simple threewire serial interface, making it easy to integrate into a wide range of embedded designs. The module is built to keep accurate time and date information even when the main system power is off, helping you log events, schedule actions, and synchronize operations reliably. Key benefits Reliable timekeeping with battery backup: The module preserves the correct time during power loss, ensuring continuity of timebased tasks and logs. Simple threewire interface: CE, CLK, and IO pins enable straightforward communication with most microcontrollers without complex protocols. Broad MCU compatibility: Suitable for AVR, ARM, and PIC platforms, with broad library and example support in common development environments. Compact SMD form factor: Designed for spaceconstrained boards and easy integration into compact projects. Time and date storage plus RAM: Stores time and date information and includes additional RAM for small data storage needs. Key attributes Functionality: Real time clock with calendar functionality, backed by a battery for powerloss retention. Compatibility: Works with a wide range of microcontrollers (AVR, ARM, PIC) that support a threewire serial interface. Size and form: Compact SMD module featuring the DS1302 IC and a 32.768 kHz timing crystal on board. Memory: Includes 31 bytes of RAM for small data storage in addition to the timekeeping registers. Performance: Low power consumption suitable for batterybacked operation; maintains time accurately with standard power management in embedded systems. Specifications and features (as represented by the DS1302 RTC module) Realtime clock IC: DS1302 Timekeeping: Keeps seconds, minutes, hours, day, date, month, and year Memory: 31 bytes of RAM for auxiliary data storage Interface: Threewire serial interface (CE, CLK, IO) Clock source: Onboard 32.768 kHz crystal oscillator Power: Operates from standard MCU supply and includes battery backup for time preservation Form factor: Surfacemount device (SMD) module with related components Typical applications and use cases Data logging: Timestamp sensor readings or events in environmental monitoring, industrial automation, or portable data loggers. Timebased control: Schedule and trigger actions or routines in embedded systems, such as daily wakeup timers, alarms, or maintenance cycles. Clocks and calendars in embedded projects: Provide accurate date and time stamping for displays, timers, or user interfaces on AVR, ARM, and PIC based boards. How this module can be used Connect the module to a microcontroller via the CE, CLK, and IO pins for clock and data communication. Supply the system with VCC and GND, and provide a VBAT connection to a backup battery or coin cell to preserve time when main power is removed. Read and write time and date information through the threewire interface, and utilize the included RAM for small data storage as needed. This RTC DS1302 Real Time Clock Module offers a straightforward, reliable solution for keeping accurate time in embedded projects. It is suitable for developers seeking a compact, versatile clock module that works with AVR, ARM, and PIC microcontrollers and maintains time through power interruptions.