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Rev 020105
FEATURES
? Unique 1-Wire
?/DIV>
Interface Requires Only One
Port Pin for Communication
? Each Device has a Unique 64-Bit Serial Code
Stored in an On-Board ROM
? Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
? 4 Pin-Programmable Bits to Uniquely Identify
Up to 16 Sensor Locations on a Bus
? Requires No External Components
? Can be Powered from Data Line. Power Supply
Range: 3.0V to 3.7V
? Measures Temperatures from -55癈 to +125癈
(-67癋 to +257癋)
? ?.5癈 Accuracy from -10癈 to +85癈
? Thermometer Resolution is User-Selectable
from 9 to 12 Bits
? Converts Temperature to 12-Bit Digital Word in
750ms (max)
? User-Definable (NV) Alarm Settings
? Alarm Search Command Identifies and
Addresses Devices Whose Temperature is
Outside of Programmed Limits (Temperature
Alarm Condition)
? Available in 8-Pin mSOP Package
? Software Compatible with the DS1822
PIN ASSIGNMENT
PIN DESCRIPTION
GND    
- Ground
DQ
- Data In/Out
N.C.    
- No Connect
V
DD
    
- Power Supply Voltage
AD0 to AD3     
- Address Pins
APPLICATIONS
Thermostatic Controls
Industrial Systems
Consumer Products
Thermometers
Thermally-Sensitive Systems
DESCRIPTION
The DS1825 digital thermometer provides 9 to 12-bit centigrade temperature measurements and has an alarm
function with NV user-programmable upper and lower trigger points. The DS1825 communicates over a 1-Wire bus
that by definition requires only one data line (and ground) for communication with a central microprocessor. It has
an operating temperature range of -55癈 to +125癈 and is accurate to ?.5癈 over the range of -10癈 to +85癈. In
addition, the DS1825 can derive power directly from the data line (parasite power), eliminating the need for an
external power supply.
ORDERING INFORMATION
ORDERING NUMBER
PACKAGE MARKING
DESCRIPTION
DS1825U
1825
8-pin 礢OP
DS1825U/T&R
1825
8-pin 礢OP Tape-and-Reel
DS1825U+
1825 (See Note 1)
8-pin mSOP, Lead Free
DS1825U+T&R
1825 (See Note 1)
8-pin 礢OP Tape-and-Reel, Lead Free
Note 1: Additionally, a "+" symbol will be marked on the package.
DS1825
Programmable Resolution 1-Wire
Digital Thermometer With 4-Bit ID
-
DQ
D3
D2
D1
D0
GND
N.C.
V
DD
6
8
7
5
3
1
2
4
8-pin   SOP
DS1825U
DS1825
礢OP
(DS1825U)
1-Wire is a registered trademark of Dallas Semiconductor.