DS1339AU+【PDF 1/19 页】IC RTC I2C W/ALARM 8USOP

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DS1339A

Low-Current, I2C, Serial Real-Time Clock

General Description

The DS1339A serial real-time clock (RTC) is a low-

power clock/date device with two programmable time-

of-day alarms and a programmable square-wave output.

Address and data are transferred serially through an I2C

bus. The clock/date provides seconds, minutes, hours,

day, date, month, and year information. The date at the

end of the month is automatically adjusted for months

with fewer than 31 days, including corrections for leap

year. The clock operates in either the 24-hour or 12-hour

format with AM/PM indicator. The DS1339A has a built-

in power-sense circuit that detects power failures and

automatically switches to the backup supply, maintaining

time, date, and alarm operation.

Applications

Handhelds (GPS, POS Terminals)

Consumer Electronics (Set-Top Box, Digital

Recording, Network Appliance)

Office Equipment (Fax/Printers, Copier)

Medical (Glucometer, Medicine Dispenser)

Telecommunications (Routers, Switches, Servers)

Other (Utility Meter, Vending Machine,

Thermostat, Modem)

Features

Drop-In Replacement for DS1339

Real-Time Clock (RTC) Counts Seconds, Minutes,

Hours, Day, Date, Month, and Year with Leap-Year

Compensation up to 2200

I2C Serial Interface

Two Time-of-Day Alarms

Programmable Square-Wave Output

Oscillator Stop Flag

Automatic Power-Fail Detect and Switch Circuitry

Trickle-Charge Capability

Underwriters Laboratories (UL) Recognized

Functional Diagram

19-6425; Rev 1; 5/13

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maximintegrated.com/DS1339A.related.

DS1339A

/4096

CONTROL LOGIC

OSCILLATOR

AND

DIVIDER

ALARMS,

TRICKLE CHARGER, AND

CONTROL REGISTERS

CLOCK AND

CALENDAR REGISTERS

USER BUFFER

(7 BYTES)

1Hz

SQW/INTB

4.096kHz

8.192kHz

32.768kHz

MUX/

BUFFER

SERIAL BUS

INTERFACE AND

ADDRESS

POWER CONTROL

SCL

SDA

VCC

VBACKUP

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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