Rainbow-electronics DS1374 Manual de usuario descargar pdf

General Description

The DS1374 is a 32-bit binary counter designed to contin-

uously count time in seconds. An additional counter gen-

erates a periodic alarm or serves as a watchdog timer. If

disabled, this counter can be used as 3 bytes of non-

volatile (NV) RAM. Separate output pins are provided for

an interrupt and a square wave at one of four selectable

frequencies. A precision temperature-compensated refer-

ence and comparator circuit monitor the status of V

detect power failures, provide a reset output, and auto-

matically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton

input for externally generating a reset. The device is pro-

grammed serially through an I

C™ serial interface.

Applications

Portable Instruments

Point-of-Sale Equipment

Medical Equipment

Telecommunications

Features

♦ 32-Bit Binary Counter

♦ Second Binary Counter Provides Time-of-Day

Alarm, Watchdog Timer, or NV RAM

♦ Separate Square-Wave and Interrupt Output Pins

♦ I

C Serial Interface

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Single-Pin Pushbutton Reset Input/Open-Drain

Reset Output

♦ Low-Voltage Operation

♦ Trickle-Charge Capability

♦ -40°C to +85°C Operating Temperature Range

♦ 10-Pin µSOP, 16-Pin SO

♦ Available in a Surface-Mount Package with an

Integrated Crystal (DS1374C)

♦ Underwriters Laboratory (UL) Recognized

DS1374

C, 32-Bit Binary Counter Watchdog RTC with

Trickle Charger and Reset Input/Output

______________________________________________ Maxim Integrated Products 1

Ordering Information

DS1374

X1 X2

CRYSTAL

SQW

SCL

SDA

INT

RST

INT

RST

GND

BACKUP

N.O.

PUSHBUTTON

RESET

PRIMARY

BATTERY,

RECHARGEABLE

BATTERY, OR

SUPER CAPACITOR

CPU

RPU

RPU = t

RPU

Typical Operating Circuit

Rev 1; 9/04

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

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

PART

TEMP RANGE

PIN-

PACKAGE

TOP MARK

DS1374U-18

-40°C to +85°C

10 µSOP DS1374-18

DS1374U-3

-40°C to +85°C

10 µSOP DS1374-3

DS1374U-33

-40°C to +85°C

10 µSOP DS1374-33

DS1374C-18

-40°C to +85°C 16 SO, 0.300"

DS1374C-18

DS1374C-3

-40°C to +85°C 16 SO, 0.300"

DS1374C-3

DS1374C-33

-40°C to +85°C 16 SO, 0.300"

DS1374C-33

C is a trademark of Philips Corp. Purchase of I

C compo-

nents of Maxim Integrated Products, Inc., or one of its subli-

censed Associated Companies, conveys a license under the

Philips I

C Patent Rights to use these components in an I

system, provided that the system conforms to the I

C Standard

Specification as defined by Philips.

Pin Configurations appear at the end of the data sheet.

1 2 3 4 5 6 ... 14 15

Indice de contenidos

Pagina 1 - Typical Operating Circuit

General DescriptionThe DS1374 is a 32-bit binary counter designed to contin-uously count time in seconds. An additional counter gen-erates a periodic

Pagina 2 - ABSOLUTE MAXIMUM RATINGS

DS1374address range 00h–03h. When the counter is read, thecurrent time of day is latched into a register, which isoutput on the serial data line while

Pagina 3 - DC ELECTRICAL CHARACTERISTICS

Special Purpose RegistersThe DS1374 has two additional registers (07h–08h) thatcontrol the WD/ALM counter and the square-wave, inter-rupt, and reset o

Pagina 4 - AC ELECTRICAL CHARACTERISTICS

DS1374Status Register (08h)Bit 7/Oscillator Stop Flag (OSF). A logic 1 in this bitindicates that the oscillator either is stopped or wasstopped for so

Pagina 5

Assume that a system power supply of 3.3V is appliedto VCCand a super cap is connected to VBACKUP. Alsoassume the trickle charger has been enabled wit

Pagina 6 - C Serial Bus

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTickle Charger and Reset Input/Output 14 ___________________________________________________________

Pagina 7 - = +3.3V, T

Handling, PC Board Layout, andAssemblyThe DS1374C package contains a quartz tuning-forkcrystal. Pick-and-place equipment can be used, butprecautions s

Pagina 8 - Pin Description

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output 2 ___________________________________________________________

Pagina 9 - Time-of-Day Counter

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output _____________________________________________________________

Pagina 10 - Pushbutton Reset Functions

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output 4 ___________________________________________________________

Pagina 11 - Special Purpose Registers

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output _____________________________________________________________

Pagina 12 - Trickle-Charge Register (10h)

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output 6 ___________________________________________________________

Pagina 13 - C Serial Data Bus

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output _____________________________________________________________

Pagina 14 - C Read Protocol

DS1374I2C, 32-Bit Binary Counter Watchdog RTC withTrickle Charger and Reset Input/Output 8 ___________________________________________________________

Pagina 15 - SO (0.300")

Detailed DescriptionThe DS1374 is a real-time clock with an I2C serial inter-face. It provides elapsed seconds from a user-definedstarting point in a

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