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DS1202, DS1202S

Serial Timekeeping Chip

DS1202, DS1202S

patents and other intellectual property rights, please refer to

Dallas Semiconductor data books.

032697 1/11

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

• 24 x 8 RAM for scratchpad data storage

• Serial I/O for minimum pin count

• 2.0–5.5 volt full operation

• Uses less than 300 nA at 2 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 16–pin SOIC for surface mount

• Simple 3–wire interface

• TTL–compatible (V

= 5V)

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

(IND)

ORDERING INFORMATION

DS1202 8–pin DIP

DS1202S 16–pin SOIC

DS1202S–8 8–pin SOIC

DS1202N 8–pin DIP (IND)

DS1202SN 16–pin SOIC (IND)

DS1202SN–8 8–pin SOIC (IND)

PIN ASSIGNMENT

GND

SCLK

I/O

RST

16–PIN SOIC

8–PIN DIP

SCLK

I/O

RST

GND

SCLK

I/O

RST

GND

8–PIN SOIC

(208 mil)

PIN DESCRIPTION

NC – No Connection

X1, X2 – 32.768 KHz Crystal Input

GND – Ground

RST

– Reset

I/O – Data Input/Output

SCLK – 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–hour or

12–hour 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.

1 2 3 4 5 6 ... 10 11

Résumé du contenu

Page 1 - Serial Timekeeping Chip

Page 2 - ADDRESS/COMMAND BYTE Figure 2

DS1202, DS1202S032697 10/11DS1202S SERIAL TIMEKEEPER 16–PIN SOICDIM MIN MAX16–PINPKGA IN. 0.500 0.511MM 12.70 12.99B IN. 0.290 0.300MM 7.37 7.65C I

Page 3 - 032697 3/11

DS1202, DS1202S032697 11/11DS1202S8 8–PIN SOIC 200 MIL1BJK GCE0–8 deg. typ.DIM MIN MAX8–PINPKGA IN. 0.203 0.213MM 5.16 5.41B IN. 0.203 0.213MM 5.1

Page 4 - CRYSTAL SELECTION

DS1202, DS1202S032697 2/11OPERATIONThe main elements of the Serial Timekeeper are shownin Figure 1: shift register, control logic, oscillator, realtim

Page 5 - A. CLOCK

DS1202, DS1202S032697 3/11RESET AND CLOCK CONTROLAll data transfers are initiated by driving the RST inputhigh. The RST input serves two functions. Fi

Page 6 - °C to 70°C; V

DS1202, DS1202S032697 4/11REGISTER SUMMARYA register data format summary is shown in Figure 4.CRYSTAL SELECTIONA 32.768 KHz crystal, can be directly c

Page 7 - = 2.0 to 5.5V*)

DS1202, DS1202S032697 5/11REGISTER ADDRESS/DEFINITION Figure 41760504030201RD0WREGISTER ADDRESS REGISTER DEFINITION01 0 0 0 0 1RD0W1 0 0 0 1 0RD01 0 0

Page 8

DS1202, DS1202S032697 6/11ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground –0.3V to +7.0VOperating Temperature 0°C to 70°CStorage Temper

Page 9

DS1202, DS1202S032697 7/11AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 2.0 to 5.5V*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESData to CLK SetuptDC

Page 10

DS1202, DS1202S032697 8/11TIMING DIAGRAM: READ DATA TRANSFER Figure 5tCCtCDZtCDDtCDHtDC017RESETCLOCKDATA INPUT/OUTPUTCOMMAND BYTETIMING DIAGRAM: WRI

Page 11 - DS1202S8 8–PIN SOIC 200 MIL

DS1202, DS1202S032697 9/1110.ICC2 is specified with RST, I/O, and SCLK open. The clock halt flag must be set to logic one (oscillator disabled).11. A

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