DS1631AU Sample Application

DESCRIPTION 

The DS1631, DS1631A, and DS1731 digital thermometers provide 9, 10, 11, or 12-bit temperature readings over a -55°C to +125°C range. The DS1631AU and DS1631A thermometer accuracy is
0.5°C from 0°C to +70°C with 3.0V VDD 5.5V, and the DS1731 accuracy is
1°C from -10°C to +85°C with 3.0V VDD 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip points (TH and TL). The TH and TL registers and thermometer configuration settings are stored in NV EEPROM so they can be programmed prior to installation. In addition, the DS1631A automatically begins taking temperature measurements at power-up, which allows it to function as a stand-alone thermostat. Communication with the DS1631/DS1631A/DS1731 is achieved through a 2-wire serial interface, and three address pins allow up to eight devices to be multidropped on the same 2-wire bus. 

Pin descriptions for the DS1631/DS1631A/DS1731 are provided in Table 2 and user-accessible registers are summarized in Table 3. A functional diagram is shown in Figure 1.

FEATURES

DS1631AU and DS1631A Provide
0.5°C Accuracy over a 0°C to +70°C Range

DS1731 Provides
1°C Accuracy over a -10°C to +85°C Range

DS1631A Automatically Begins Taking Temperature Measurements at Power-Up

Operating Temperature Range: -55°C to +125°C (-67°F to +257°F)

Temperature Measurements Require No External Components

Output Resolution is User-Selectable to 9,10, 11, or 12 Bits

Wide Power-Supply Range (+2.7V to +5.5V)

Converts Temperature-to-Digital Word in 750ms (max)

Multidrop Capability Simplifies Distributed Temperature-Sensing Applications

Thermostatic Settings are User-Definable and Nonvolatile (NV)

Data is Read/Written Through 2-Wire Serial Interface (SDA and SCL Pins)

All Three Devices are Available in 8-Pin SOP Packages and the DS1631AU is Also Available in a 150mil SO package—see Table 1 for Ordering Information

APPLICATIONS

Network Routers and Switches

Cellular Base Stations

Portable Products

Any Space-Constrained Thermally Sensitive Product

Feature

Applications

(Picture: Diagram)