DS1677E-5 Dallas Semiconductor, DS1677E-5 Datasheet

DS1677E-5

Manufacturer Part Number

DS1677E-5

Description

Manufacturer

Dallas Semiconductor

Datasheet

1.DS1677E-5.pdf (17 pages)

Specifications of DS1677E-5

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FEATURES

ORDERING INFORMATION

DS1677E 20–Pin TSSOP

DESCRIPTION

The Portable System Controller is a circuit, which incorporates many of the functions necessary for low

power portable products integrated into one chip. The DS1677 provides a Real Time Clock, NV RAM

controller, micro-processor monitor, power–fail warning, and a 3–channel, 8–bit analog–to–digital

converter. Communication with the DS1677 is established through a simple 3–wire interface.

The Real Time Clock (RTC) provides seconds, minutes, hours, day, date, month, and year information

with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the

DS1677 is powered by the system power supply or when in battery backup operation so the alarm can be

used to wake up a system that is powered down.

www.dalsemi.com

Provides Real Time Clock:

Microprocessor monitor:

=NV RAM control:

3–channel, 8–bit analog–to–digital converter

Simple 3–wire interface

+5.0V operation

=1.25V threshold detector for power–fail

warning

Counts seconds, minutes, hours, date of

the month, month, day of the week, and

year with leap year compensation valid up

to 2100

Power control circuitry supports system

power on from day/time alarm

Halts microprocessor during power–fail

Automatically restarts microprocessor

after power failure

Monitors push–button for external

override

Halts and resets an out of control

microprocessor

Automatic battery backup and write

protection to external SRAM

1 of 17

PIN ASSIGNMENT

Portable System Controller

SCLK

GND

CEO

CEI

INT

CCO

I/O

BAT

20-Pin TSSOP

AIN0

AIN1

AIN2

RST

PFI

PFO

DS1677

122800

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