DS1825 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

DS1825
Programmable Resolution 1-Wire
Digital Thermometer With 4-Bit ID
www.maxim-ic.com
FEATURES
§ Unique 1-Wire^Ò 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°C to +125°C
(-67°F to +257°F)
§ ±0.5°C Accuracy from -10°C to +85°C
§ 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
1-Wire is a registered trademark of Dallas Semiconductor.
PIN ASSIGNMENT
V_DD
DQ
N.C.
GND
1
8
2
7
DS1825
3 _{8-pin mSOP}⁶
(DS1825U)
4
5
µSOP
(DS1825U)
AD3
AD2
AD1
AD0
PIN DESCRIPTION
GND
- Ground
DQ
- Data In/Out
N.C.
- No Connect
V_DD
AD0 to AD3
- Power Supply Voltage
- 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°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C. 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 µSOP
DS1825U/T&R
1825
8-pin µSOP Tape-and-Reel
DS1825U+
1825 (See Note 1)
8-pin mSOP, Lead Free
DS1825U+T&R
1825 (See Note 1)
8-pin µSOP Tape-and-Reel, Lead Free
Note 1: Additionally, a "+" symbol will be marked on the package.
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Rev 020105