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DS7505

DS7505

High-Precision Digital Thermometer and Thermostat

Improved LM75/DS75 Software-Compatible Temperature Sensor Is ±0.5°C Accurate and Has Nonvolatile Thermostat Thresholds

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Overview

Description

The DS7505 low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature readings over a -55°C to +125°C range with ±0.5°C accuracy over a -0°C to +70°C range. A 9-bit resolution mode is software compatible with the LM75.

The DS7505 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) that are stored in EEPROM registers.
DS7505: Block Diagram DS7505: Block Diagram Enlarge+

Key Features

  • Extends Performance Range with a Low-Voltage, 1.7V to 3.7V Operating Range
  • Maximizes System Accuracy in Broad Range of Thermal Management Applications
    • Measures Temperature from -55°C to +125°C (-67°F to +257°F)
    • ±0.5°C Accuracy Over a 0°C to +70°C Range
    • User-Configurable Resolution from 9 Bits (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)
  • Reduces Cost with No External Components and Stand Alone Thermostat Capability
  • Increases Reliability and System Robustness
    • Internally Filtered Data Lines for Noise Immunity (50ns Deglitch)
    • Bus Timeout Feature Prevents Lockup on a 2-Wire Interface
  • Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
    • Up to Eight Devices Can Operate on a 2-Wire Bus
  • Fast 25ms (max) 9-Bit Conversion Time
  • Flexible and Nonvolatile (NV) User-Defined Thermostatic Modes

Applications/Uses

  • Any Thermally Sensitive System
  • Cellular Base Stations
  • Medical Equipment
  • Networking Equipment
  • Office Equipment

Parametric Specs

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)		Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)		Multi DroppableOper. Temp.
(°C)		Package/PinsBudgetary
Price
See Notes
DS7505 LocalStandalone Thermostat2-Wire/I2C/SMBusOne0.5NoProgrammable (NV)
9
10
11
12
Yes-55 to +125
SOIC (N)/8
UMAX/8
$1.31 @1k
See All Temperature Sensors (111)
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.

Design Resources

Technical Documents

App Note 5727 Understanding Multidrop Address Assignments for Thermal Sensors
Tutorial 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial 4699 Overview of Sensor Signal Paths
Tutorial 4685 How Continuous Positive Airway Pressure (CPAP) Respiratory Ventilation Systems Function
Tutorial 4679 Thermal Management Handbook

Quality and Environmental Data

Product Reliability Reports: DS7505.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • DS7505 IBIS Model

    • CAD Symbols and Footprints

  • DS7505S+
  • DS7505S+T&R
  • DS7505U+
  • DS7505U+T&R
    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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