High-Precision Digital Thermometer and Thermostat

 

Part Number	Replacement	Explanation

Description

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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 (T_OS and T_HYST) that are stored in EEPROM registers.

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