Digital Thermometer and Thermostat

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The DS75 digital thermometer and thermostat provides 9, 10, 11, or 12-bit digital temperature readings over a -55°C to +125°C range with ±2°C accuracy over a -25°C to +100°C range. At power-up, the DS75 defaults to 9-bit resolution for software compatibility with the LM75. Communication with the DS75 is achieved via a simple 2-wire serial interface. Three address pins allow up to eight DS75 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature sensing applications.

The DS75 thermostat has a dedicated open-drain output (O.S.) and programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S is activated. There are two thermostatic operating modes that control thermostat operation based on user-defined trip-points (TOS and THYST).

A block diagram of the DS75 is shown in Figure 1 and detailed pin descriptions are given in Table 2.
DS75: Functional Block Diagram DS75: Functional Block Diagram Enlarge+

Key Features

  • Temperature Measurements Require No External Components
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±2°C Accuracy Over a -25°C to +100°C Range
  • Thermometer Resolution is User-Configurable from Nine (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)
  • 9-Bit Conversion Time is 150ms (Max)
  • Thermostatic Settings are User-Definable
  • Data is Read/Written Via 2-Wire Serial Interface (SDA and SCL Pins)
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Wide Power-Supply Range (+2.7V to +5.5V).
  • Pin/software Compatible with the LM75
  • Available in 8-Pin µMAX® and SO Packages. See Table 1 for Ordering Information
  • Applications Include Personal Computers, Cellular Base Stations, Office Equipment, or Any Thermally Sensitive System


  • Any Thermally Sensitive System
  • Cell Phone Base Stations
  • Office Equipment
  • Personal Computing

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Multi DroppableOper. Temp.
See Notes
DS75 Local2-Wire/I2C/SMBusOne2NoProgrammable
Yes-55 to +125
SOIC (N)/8
$0.90 @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.

Tools & Models

  • DS75 IBIS Model
  • Product Reliability Reports: DS75.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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