Rainbow-electronics DS1302 Uživatelský manuál stáhnout pdf

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DS1302

Trickle Charge Timekeeping Chip

DS1302

041697 1/12

FEATURES

• 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

• 31 x 8 RAM for scratchpad data storage

• Serial I/O for minimum pin count

• 2.5–5.5 volt full operation

– Optional 2.0–5.5 volt full operation also available

• Uses less than 300 nA at 2.5 volts

• Single–byte or multiple–byte (burst mode) data trans-

fer for read or write of clock or RAM data

• 8–pin DIP or optional 8–pin SOIC’s for surface mount

• Simple 3–wire interface

• TTL–compatible (V

= 5V)

• Optional industrial temperature range –40°C to +85°C

• DS1202 compatible

• Added features over DS1202

– Optional trickle charge capability to V

CC1

– Dual power supply pins for primary and backup

power supplies

– Backup power supply pin can be used for battery

or super cap input

– Additional scratchpad memory (7 bytes)

PIN ASSIGNMENT

DS1302

CC1

SCLK

I/O

RST

CC2

GND

CC1

SCLK

I/O

RST

CC2

GND

DS1302S 8–PIN SOIC (200 MIL)

8–PIN DIP (300 MIL)

DS1302Z 8–PIN SOIC (150 MIL)

PIN DESCRIPTION

X1, X2 – 32.768 kHz Crystal Pins

GND – Ground

RST – Reset

I/O – Data Input/Output

SCLK – Serial Clock

CC1

, V

CC2

– Power Supply Pins

ORDERING INFORMATION

PART # DESCRIPTION

DS1302 Serial Timekeeping Chip; 8–pin DIP

DS1302S Serial Timekeeping Chip;

8–pin SOIC (200 mil)

DS1302Z Serial Timekeeping Chip;

8–pin SOIC (150 mil)

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 simpli-

fied 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 31

bytes. The DS1302 is designed to operate on very low

power and retain data and clock information on less

than 1 microwatt.

1 2 3 4 5 6 ... 11 12

Shrnutí obsahu

Strany 1 - DESCRIPTION

Strany 2 - DS1302 BLOCK DIAGRAM Figure 1

DS1302041697 10/12AC ELECTRICAL CHARACTERISTICS (cont’d) (0°C to 70°C; VCC = +5V ± 10%*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCLK to RST HoldtCCHVCC

Strany 3 - 041697 3/12

DIM MIN MAX8–PINPKGA IN.MMB IN.MMC IN.MMD IN.MME IN.MMF IN.MMG IN.MMH IN.MMJ IN.MMK IN.MM0.3609.140.40010.160.2406.100.2606.600.1203.050.1403.560.3007

Strany 4 - 041697 4/12

DS1302041697 12/12DS1302S SERIAL TIMEKEEPER 8–PIN SOIC (150 MIL AND 200 MIL)DIM MIN MAX8–PIN(150 MIL)PKGA IN.MMB IN.MMC IN.MME IN.MMF IN.MMG IN.MMH IN

Strany 5 - BURST MODE TRANSFER

176A45A34A23A12A01RD0WRAMCKDS1302041697 2/12The DS1302 is the successor to the DS1202. In addi-tion to the basic timekeeping functions of the DS1202,

Strany 6 - A. CLOCK

DS1302041697 3/12RESET AND CLOCK CONTROLAll data transfers are initiated by driving the RST inputhigh. The RST input serves two functions. First, RSTt

Strany 7

DS1302041697 4/12TCS. The RS bits (bits 0 – 1) select the resistor that isconnected between VCC2 and VCC1. The resistorselected by the resistor sele

Strany 8 - = 2.5 to 5.5V*)

DS1302041697 5/12DATA TRANSFER SUMMARY Figure 3SCLKI/ORST01 23456 701 23456 7R/WA0 A1 A2 A3 A4 1ADDRESS COMMAND DATA INPUT/OUTPUTSINGLE BYTE TRANSFERS

Strany 9 - 041697 9/12

DS1302041697 6/12REGISTER ADDRESS/DEFINITION Figure 41760504030201RD0WREGISTER ADDRESS REGISTER DEFINITION01 0 0 0 0 1RD0W1 0 0 0 1 0RD01 0 0 0 1 1RD0

Strany 10 - = +5V ± 10%*)

DS1302041697 7/12DS1302 PROGRAMMABLE TRICKLE CHARGER Figure 51 OF 3SELECT1 OF 2SELECT1 OF 16 SELECT(NOTE: ONLY 1010 CODE ENABLES CHARGERVCC2PIN #1VCC1

Strany 11

DS1302041697 8/12ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground –0.5V to +7.0VOperating Temperature 0°C to 70°CStorage Temperature –55

Strany 12

DS1302041697 9/12DC ELECTRICAL CHARACTERISTICS (cont’d) (0°C to 70°C; VCC = 2.5 to 5.5V*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESTimekeeping CurrentIC

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