General 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. Communication with the DS7505 is achieved through a simple 2-wire serial interface. Three address pins allow up to eight DS7505 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature-sensing applications.

Features

♦ Operating Range from 1.7V to 3.7V

♦ Temperature Measurements Require No External Components

♦ Measures Temperatures from -55°C to +125°C (-67°F to +257°F)

♦ ±0.5°C Accuracy Over a 0°C to +70°C Range

♦ Thermometer Resolution is User-Configurable from 9 (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)

♦ 9-Bit Conversion Time is 25ms (max)

♦ Thermostatic Settings are User-Definable and Nonvolatile (NV)

♦ Stand-Alone Thermostat Capability

♦ Data Read/Write Occurs Through a 2-Wire Serial Interface (SDA and SCL Pins)

♦ Data Lines Filtered Internally for Noise Immunity (50ns Deglitch)

♦ Optional Bus Timeout Feature Prevents Lockup Problems on 2-Wire Interface

♦ Multidrop Capability Simplifies Distributed Temperature-Sensing Applications

♦ Pin/Software Compatible with the LM75

♦ Available in 8-Pin SO and µMAX® Packages

Applications

    Networking Equipment

    Cellular Base Stations

    Office Equipment

    Medical Equipment

    Any Thermally Sensitive System