DS1629 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS1629

2-Wire Digital Thermometer and Real Time Clock

Dallas Semiconductor -> Maxim Integrated 

www.dalsemi.com

DS1629

2-Wire Digital Thermometer

and Real Time Clock

FEATURES

§ Measures temperatures from -55°C to

+125°C; Fahrenheit equivalent is -67°F to

257°F

§ Real time clock counts seconds, minutes,

hours, date of the month, month, day of the

week, and year with leap year compensation

through the year 2100

§ Thermometer accuracy is ±2.0°C (typ)

§ Thermometer resolution is 9 bits (expandable)

§ Thermostatic and time alarm settings are user

definable. Dedicated open-drain Alarm output

§ 32 bytes SRAM for general data storage

§ Data is read from/written to via a 2-wire serial

interface. (open drain I/O lines)

§ Wide power supply range (2.2V - 5.5V)

§ Applications include personal

computers/PDAs, cellular telephones, office

equipment, dataloggers, or any thermally

sensitive system

§ 8-pin 150mil SOIC package

PIN ASSIGNMENT

SDA 1

SCL 2

ALRM 3

GND 4

8

VDD

7 OSC

6 X1

5

X2

DS1629S 8-Pin SOIC

(150-mil)

PIN DESCRIPTION

SDA

- 2-Wire Serial Data Input/Output

SCL

- 2-Wire Serial Clock

GND

- Ground

ALRM

- Thermostat & Clock Alarm

Output

X1

- 32.768 kHz Crystal Input

X2

- 32.768 kHz Crystal Feedback

Output

OSC

- Buffered Oscillator Output

VDD

- Power Supply Voltage (+2.2V to

+5V)

DESCRIPTION

The DS1629 2-Wire Digital Thermometer and Real Time Clock integrates the critical functions of a real

time clock and a temperature monitor in a small outline 8-pin SOIC package. Communication to the

DS1629 is accomplished via a 2-wire interface. The wide power supply range and minimal power

requirement of the DS1629 allow for accurate time/temperature measurements in battery-powered

applications.

The digital thermometer provides 9-bit temperature readings which indicate the temperature of the device.

No additional components are required; the device is truly a “temperature-to-digital” converter.

The clock/calendar provides seconds, minutes, hours, day, date of the month, day of the week, month, and

year. The end of the month date is automatically adjusted for months with less than 31 days, including

corrections for leap years. It operates in either a 12- or 24-hour format with AM/PM indicator in 12-hour

mode.The crystal oscillator frequency is internally divided, as specified by device configuration. An

open-drain output is provided that can be used as the oscillator input for a microcontroller.

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