时钟芯片ZC1302完全替代DS1302

四维电子

BENEFITS AND FEATURES
$ h. Y. o! j9 Z1 o1 y" E+ q Completely Manages All Timekeeping Functions
$ z" u' i9 c. [4 O) h3 r1 Fo Real-Time Clock Counts Seconds,
Minutes, Hours, Date of the Month, Month,
Day of the Week, and Year with Leap-Year
/ s. U8 m, W) T- o/ ?& b! C, yCompensation Valid Up to 2100
' q0 A5 `& F; \  `+ |o 31 x 8 Battery-Backed General-Purpose
RAM
6 W, R' y! C5 G) H( S3 Q7 j Simple Serial Port InteRFaces to Most
Microcontrollers
o Simple 3-Wire Interface
o TTL-Compatible (VCC = 5V)
o Single-Byte or Multiple-Byte (Burst Mode)
9 f7 [- a( u. x% b* gData Transfer for Read or Write of Clock or
RAM Data
9 h5 M0 X$ y; m' ~3 U2 K Low Power Operation Extends Battery Backup
Run Time
' d9 q% W; x* v" I7 v4 Mo 2.0V to 5.5V Full Operation
o Uses Less Than 300nA at 2.0V
0 W5 w5 _; t8 D% j2 ?9 l$ m( N/ u" M) X 8-Pin DIP and 8-Pin SO Minimizes Required
2 ~/ y) H5 U% X: DSpace
) g) {& u6 J; f9 }' E6 b Optional Industrial Temperature Range: -40°C
. m. J0 c. g0 I* hto +85°C Supports Operation in a Wide Range
of Applications
 Underwriters Laboratories® (UL) Recognized
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% m( p& m( A) R# k* vDETAILED DESCRIPTION
/ a: I2 C9 R0 L3 TThe ZC1302 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,
6 C; v# F. X" i+ W, Vminutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for
5 Z- v! ?+ S9 I, X0 smonths with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or
7 J5 c; E9 z. b+ J12-hour format with an AM/PM indicator.
Interfacing the ZC1302 with a microprocessor is simplified by using synchronous serial communication. Only three
wires are required to communicate with the clock/RAM: CE, 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 ZC1302 is designed to
1 G# u- F7 s' O9 \operate on very low power and retain data and clock information on less than 1µW.
The ZC1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the
ZC1302 has the additional features of dual power pins for primary and backup power supplies, programmable
trickle charger for VCC1, and seven additional bytes of scratchpad memory

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