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  19-6849; Rev 11/13
 
 
FEATURES
?  Measures Temperatures from -55癈 to
+125癈; Fahrenheit Equivalent is -67癋 to
257癋
?  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 ?.0癈 (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 to 5.5V)
?  Applications Include PCs/PDAs, Cellular
Telephones, Office Equipment, Data Loggers,
or Any Thermally Sensitive System
?  8-Pin (150-mil) SO Package
 
PIN CONFIGURATION
 
 
 
 
 
 
 
 
 
 
 
 
PIN DESCRIPTION
SDA   
- 2-Wire Serial Data Input/Output
SCL    
- 2-Wire Serial Clock
GND   
- Ground
ALRM
- Thermostat and Clock Alarm
 
 
 Output
X1
 
- 32.768kHz Crystal Input
X2
 
- 32.768kHz Crystal Feedback
 Output
OSC   
- Buffered Oscillator Output
V
DD
    
- Power-Supply Voltage (+2.2V to
 
 
 +5V)
 
DESCRIPTION
The DS1629 2-wire digital thermometer and real-time clock (RTC) integrates the critical functions of a
real-time clock and a temperature monitor in a small outline 8-pin SO 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.
DS1629
2-Wire Digital Thermometer
and Real-Time Clock
1
2
3
4
8
7
6
5
GND
ALRM
SCL
SDA
V
DD
 
OSC
X1
X2
SO
1    mil
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