DS1825

Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID


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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.

Each DS1825 has a unique 64-bit serial code, which allows multiple DS1825s to function on the same 1-Wire bus; thus, it is simple to use one microprocessor to control many DS1825s distributed over a large area. In addition, the 4-bit location address can be used to identify specific temperature sensors in the system without requiring a wide lookup table. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.

DS1825: Block Diagram DS1825: Block Diagram Enlarge+

Key Features

  • Unique 1-Wire 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 µSOP Package
  • Software Compatible with the DS1822
  • Applications/Uses

    • Consumer Products
    • Industrial Systems
    • Thermally Sensitive Systems
    • Thermometers
    • Thermostatic Controls

    See parametric specs for Temperature Sensors (113)


    Part NumberSensor TypeInterfaceChannelsAccuracy
    (±°C)
    Parasite Pwr.Temp. Thresh.Temp. Resolution
    (bits)
    Oper. Temp.
    (°C)
    Package/PinsBudgetary
    Price
    See Notes
    DS1825 Local1-WireOne0.5YesProgrammable (NV)
    9
    10
    11
    12
    -55 to +125
    DICE SALES/N
    UMAX/8
    $1.95 @1k

    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
    Product Reliability Reports: DS1825.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
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