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Digital Thermometer and Thermostat

Product Details

Key Features

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 9
10
11
12
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.01
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 9
10
11
12
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.01

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

DS75: Functional Block Diagram DS75: Functional Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .