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No Connection
32.768 KHz Crystal Input
Ground
Reset
Data Input/Output
Serial Clock
Power Supply Pin
DESCRIPTION
The DS1202 Serial Timekeeping Chip contains a real
time clock/calendar and 24 bytes of static RAM. It com-
municates with a microprocessor via a simple serial in-
terface. The real time clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The end of the month date is automatically adjusted for
months with less than 31 days, including corrections for
leap year. The clock operates in either the 24鈥揾our or
12鈥揾our format with an AM/PM indicator. Interfacing the
DS1202 with a microprocessor is simplified by using
synchronous serial communication. Only three wires
are required to communicate with the clock/RAM: (1)
RST (Reset), (2) I/O (Data line), and (3) SCLK (Serial
clock). Data can be transferred to and from the clock/
RAM one byte at a time or in a burst of up to 24 bytes.
The DS1202 is designed to operate on very low power
and retain data and clock information on less than 1 mi-
crowatt.
ECopyright
1997 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
032697 1/11