DS1677 データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

部品番号

コンポーネント説明

メーカー

DS1677

Portable System Controller

Dallas Semiconductor -> Maxim Integrated 

DS1677

Portable System Controller

www.maxim-ic.com

GENERAL DESCRIPTION

The DS1677 portable system controller is a

circuit that incorporates many of the functions

necessary for low-power portable products

integrated into one chip. The device provides a

real-time clock (RTC), NV RAM controller,

microprocessor monitor, power-fail warning, and

a 3-channel, 8-bit analog-to-digital converter

(ADC). Communication with the DS1677 is

established through a simple 3-wire interface.

The 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.

Automatic backup and write protection of an

external SRAM is provided through the VCCO and

CEO pins. The backup energy source used to

power the RTC is also used to retain RAM data in

the absence of VCC through the VCCO pin. CEO,

the chip-enable output to SRAM, is controlled

during power transients to prevent data

corruption.

ORDERING INFORMATION

PART*

DS1677E

DS1677E+

VOLTAGE

(V)

5.0

5.0

PIN-

PACKAGE

20 TSSOP

20 TSSOP

TOP MARK†

DS1677-5

DS1677-5

* All devices are specified over the 0°C to +70°C operating range.

† A “‘+” anywhere on the top mark denotes a lead-free device.

+ Denotes a lead-free/RoHS-compliant device.

FEATURES

§ Provides 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

Power Control Circuitry Supports System

Power-On from Day/Time Alarm

§ Microprocessor Monitor

Halts Microprocessor During Power-Fail

Automatically Restarts Microprocessor After

Power Failure

Monitors Pushbutton for External Override

Halts and Resets an Out-of-Control

Microprocessor

§ NV RAM Control

Automatic Battery Backup and Write

Protection to External SRAM

§ 3-Channel, 8-Bit ADC

§ Simple 3-Wire Interface

§ +5.0V Operation

§ 1.25V Threshold Detector for Power-Fail

Warning

§ UL Recognized

PIN CONFIGURATION

TOP VIEW

VBAT

VCCO

SCLK

1

20

DS1677

2

19

3

18

I/O

4

17

CS

5

16

CEI

6

15

CEO

7

14

N.C.

8

13

INT

9

12

GND

10

11

ST

VCC

X1

X2

AIN0

AIN1

AIN2

RST

PFI

PFO

TSSOP

4.4mm

1 of 18

REV: 080905

Share Link: