1 DS1302 Trickle Charge Timekeeping Chip 一、FEATURES 1、 Real time clock counts seconds, minutes hours, date of the month, month, day of the week, and year with leap year compensation valid up to 2100. 2、 31 x 8 RAM for scratchpad data storage. 3、 Serial I/O for minimum pin count. 4、 2.0–5.5V full operation. 5、 Uses less than 300 nA at 2.0V. 6、 Single–byte or multiple–byte (burst mode) data transfer for read or write of clock or RAM data. 7、 8–pin DIP or optional 8–pin SOICs for surface mount. 8、 Simple 3–wire interface. 9、 TTL–compatible (VCC = 5V). 10、 Optional industrial temperature range –40°C to +85°C. 11、 DS1202 compatible. 二、PIN ASSIGNMENT 三、PIN DESCRIPTION ① X1, X2： 32.768 kHz Crystal Pins；②GND： Ground；③RST： Reset；④I/O： Data Input/Output；⑤ SCLK： Serial Clock；⑥VCC1, VCC2： Power Supply Pins 四、DESCRIPTION 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. 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– hour or 12– hour format with an AM/PM indicator. Interfacing the DS1302 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 1 byte at a time or in a burst of up to 31 bytes. The DS1302 is designed to operate ...
