慢速充电时钟芯片DS1302中英文资料1.doc

DS1302 Trickle Charge Timekeeping Chip 一、FEATURES1、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 21002、31 x 8 RAM for scratchpad data storage3、Serial I/O for minimum pin count4、2.0–5.5V full operation5、Uses less than 300 nA at 2.0V6、Single–byte or multiple–byte (burst mode) data transfer for read or write of clock or RAM data7、8–pin DIP or optional 8–pin SOICs for surface mount8、Simple 3–wire interface9、TTL–compatible (VCC = 5V)10、Optional industrial temperature range –40°C to +85°C11、DS1202 compatiblePIN ASSIGNMENT 三、PIN DESCRIPTION ①X1, X2：32.768 kHz Crystal Pins；②GNDGround；③RSTReset；④I/OData Input/Output；⑤SCLKSerial Clock；⑥VCC1, VCC2Power 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 on very low power and retain data and clock information on less than 1 microwatt. The DS1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the DS1302 has the additional features of dual power pins for primary and back–up power supplies, programmable trickle charger for VCC1, and seven additional bytes of scratchp