Rainbow-electronics DS1338 Manual de usuario descargar pdf

1 of 15

REV: 091404

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata

GENERAL DESCRIPTION

The DS1338 serial real-time clock (RTC) is a low-

power, full binary-coded decimal (BCD)

clock/calendar plus 56 bytes of NV SRAM. Address

and data are transferred serially through an I

C™

interface. The clock/calendar provides seconds,

minutes, hours, day, date, month, and year

information. The end of the month date 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 DS1338 has a built-in power-

sense circuit that detects power failures and

automatically switches to the battery supply.

APPLICATIONS

Handhelds (GPS, POS Terminal)

Consumer Electronics (Set-Top Box, Digital

Recording, Network Appliance)

Office Equipment (Fax/Printer, Copier)

Medical (Glucometer, Medicine Dispenser)

Telecommunications (Router, Switcher, Server)

Other (Utility Meter, Vending Machine, Thermostat,

Modem)

TYPICAL OPERATING CIRCUIT

FEATURES

§ RTC Counts Seconds, Minutes, Hours, Date of

the Month, Month, Day of the Week, and Year

with Leap-Year Compensation Valid Up to 2100

§ Available in a Surface-Mount Package with an

Integrated Crystal (DS1338C)

§ 56-Byte Battery-Backed NV RAM for Data

Storage

§ I

C Serial Interface

§ Programmable Square-Wave Output Signal

§ Automatic Power-Fail Detect and Switch Circuitry

§ Underwriters Laboratory (UL) Recognized

ORDERING INFORMATION

PART TEMP RANGE PIN-PACKAGE TOP MARK

DS1338Z-18 -40°C to +85°C 8 SO (150 mils) DS1338-18

DS1338Z-3 -40°C to +85°C 8 SO (150 mils) DS1338-3

DS1338Z-33 -40°C to +85°C 8 SO (150 mils) DS1338-33

DS1338U-18 -40°C to +85°C

8 mSOP

1338

rr-18

DS1338U-3 -40°C to +85°C

8 mSOP

1338

rr-3

DS1338U-33 -40°C to +85°C

8 mSOP

1338

rr-33

DS1338C-18 -40°C to +85°C 16 SO (300 mils) DS1338C-18

DS1338C-3 -40°C to +85°C 16 SO (300 mils) DS1338C-3

DS1338C-33 -40°C to +85°C 16 SO (300 mils) DS1338C-33

rr = second line, revision level

Pin Configurations appear at end of data sheet.

DS1338

C RTC with 56-Byte NV RAM

www.maxim-ic.com

C is a trademark of Philips Corp. Purchase of I

C components from

Maxim Integrated Products, Inc., or one of its sublicensed Associated

Companies, conveys a license under the Philips I

C Patent Rights to

use these components in an I

C system, provided that the system

conforms to the I

C Standard Specification as defined by Philips.

DS1338

CPU

SDA

SCL

GND

X2 X1

RPU RPU

CRYSTAL

SQW/OUT

BAT

RPU = t

/ C

1 2 3 4 5 6 ... 14 15

Indice de contenidos

Pagina 1 - C RTC with 56-Byte NV RAM

1 of 15 REV: 091404 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisio

Pagina 2 - ABSOLUTE MAXIMUM RATINGS

DS1338 I2C RTC with 56-Byte NV RAM 10 of 15 CLOCK AND CALENDAR The time and calendar information is obtained by reading the appropriate register byt

Pagina 3

DS1338 I2C RTC with 56-Byte NV RAM 11 of 15 Control Register (07h) The control register controls the operation of the SQW/OUT pin and provides oscil

Pagina 4 - RECOGNIZED

DS1338 I2C RTC with 56-Byte NV RAM 12 of 15 I2C SERIAL DATA BUS The DS1338 supports the I2C protocol. A device that sends data onto the bus is defin

Pagina 5 - Figure 3. Block Diagram

DS1338 I2C RTC with 56-Byte NV RAM 13 of 15 Depending upon the state of the R/W bit, two types of data transfer are possible: 1) Data transfer fro

Pagina 6 - = 3.3V, T

DS1338 I2C RTC with 56-Byte NV RAM 14 of 15 Figure 8. Data Write—Slave Receiver Mode Figure 9. Data Read—Slave Transmitter Mode

Pagina 7 - DETAILED DESCRIPTION

DS1338 I2C RTC with 56-Byte NV RAM 15 of 15 Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry en

Pagina 8 - OSCILLATOR CIRCUIT

DS1338 I2C RTC with 56-Byte NV RAM 2 of 15 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground………………………………………………………..……..-0.3V to +6

Pagina 9 - RTC AND RAM ADDRESS MAP

DS1338 I2C RTC with 56-Byte NV RAM 3 of 15 DC ELECTRICAL CHARACTERISTICS (VCC = 0V, TA = -40°C to +85°C.) (Note 1) PARAMETER SYMBOL MIN TYP MAX UNI

Pagina 10 - CLOCK AND CALENDAR

DS1338 I2C RTC with 56-Byte NV RAM 4 of 15 POWER-UP/POWER-DOWN CHARACTERISTICS (TA = -40°C to +85°C) (Note 1, Figure 1) PARAMETER SYMBOL MIN TYP MA

Pagina 11 - Control Register (07h)

DS1338 I2C RTC with 56-Byte NV RAM 5 of 15 Figure 2. Timing Diagram Figure 3. Block Diagram RAM (56 x 8) SERIAL BUS

Pagina 12 - C SERIAL DATA BUS

DS1338 I2C RTC with 56-Byte NV RAM6 of 15 TYPICAL OPERATING CHARACTERISTICS(VCC = 3.3V, TA = +25°C, unless otherwise noted.)OSCILLATOR FREQUENCY vs.

Pagina 13

DS1338 I2C RTC with 56-Byte NV RAM 7 of 15 PIN DESCRIPTION PIN 8 16 NAME FUNCTION 1 — X1 2 — X2 32.768kHz Crystal Connections. The internal oscill

Pagina 14

DS1338 I2C RTC with 56-Byte NV RAM 8 of 15 OPERATION The DS1338 operates as a slave device on the serial bus. Access is obtained by implementing a S

Pagina 15 - PACKAGE INFORMATION

DS1338 I2C RTC with 56-Byte NV RAM 9 of 15 CLOCK ACCURACY The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy o

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Rainbow-electronics DS1338 Manual de usuario

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