RTC Click Board™

The RTC Click Board™ is an accessory board designed to add time measuring functionality to the device. This Click Board™ has a PCF8583 serial real-time clock/calendar. The PCF8583 IC is a full binary-coded decimal (BCD) clock and calendar chip with 24- or 12-hour clock format with four-year calendar, based on a 2048-bit static CMOS RAM. For communication with the target board microcontroller, RTC Click Board™ uses the I2C interface. The board comes with an integrated 3V/230mA lithium battery that serves as a backup power supply. Even when the main power supply goes OFF, this backup power supply enables the device to function continuously. It is designed to use a 3.3V power supply, but can be used with 5V systems by soldering the PWR SEL SMD jumper to the 5V position.

RTC Click Board™ is an ideal choice for applications that require real-time clocks, calendars and programmed alarms.

IC/Module: PCF8583 Serial Real-Time Clock/Calendar

PCF8583 is a clock and calendar IC based on a 2048-bit static CMOS RAM organized as 256 words by 8 bits. It involves transferring addresses and data serially through the two-line bidirectional I2C-bus. The integrated 32.768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the clock/calendar and counter functions. The next 8 bytes may be programmed as alarm registers or used as free RAM space. The remaining 240 bytes are free RAM locations.

Power Supply Selection

RTC Click Board™ is provided with a zero-ohm PWR SEL SMD jumper that enable user to choose a 3.3V or 5V power supply. By default, the jumper is soldered to the 3.3V position