The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface.
Only three wires are required to communicate with the clock/RAM: CE (chip enable), I/O (data line) and SCLK (serial clock). Data can be transferred to and from the clock/RAM 1 byte at a time, or in a burst of up to 31 bytes. The DS1302 is designed to operate on very low power, and retain the data and clock information on less than 1 µW.
- Counts seconds, minutes, hours, date of the month, month, day of the week, and year
- Leap-Year Compensation Valid Up to 2100
- Supports 24 hour mode or 12 hour mode with AM/PM indicator
- 31 byte of static RAM
- Use with temperature sensor to create a custom digital thermostat
- Custom clock
- Project timer
Note: A 32.768 kHz Crystal (#251-03230) with a 6 pF load capacitance is needed (sold separately).
- Voltage requirements: 2-5 VDC
- Current requirements: <300nA
- Communication: 3-wire synchronous serial (SPI)
- Package: DIP-8 (.300")
- Operating temp range: -32° to +185° F (-0° to + 70° C)