Parallax has designed a clock module that includes a 32kHz crystal and battery backup in a compact SIP package. The DS1302 provides seconds, minutes, hours date, day of week and year with leap-year compensation up to the year 2100. It has both a 24-hour and a 12-hour mode with AM/PM indication. The module supports a wide operating voltage range of 3.3VDC to 5VDC. It incorporates an SPI interface that supports 3-wire or 4-wire synchronous serial connection.
The module can be integrated into electronic clocks, dataloggers with data/time stamp and sprinkler control timers.