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DS1620：Digital Thermometer and Thermostat

The DS1620 Digital Thermometer and Thermostat provides 9-bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat. THIGH is driven high if the DS1620's temperature is greater than or equal to a user-defined temperature TH. TLOW is driven high if the DS1620's temperature is less than or equal to a user-defined temperature TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls below that of TL. User-defined temperature settings are stored in nonvolatile memory, so parts can be programmed prior to insertion in a system, as well as used in standalone applications without a CPU. Temperature settings and temperature readings are all communicated to/from the DS1620 over a simple 3-wire interface.

Key Features Simply Adds Temperature Monitoring and Control to Any System Measures Temperatures From -55°C to +125°C in 0.5°C Increments; Fahrenheit Equivalent is -67°F to +257°F in 0.9°F Increments Temperature is Read as a 9-Bit Value Converts Temperature to Digital Word in 750ms (max) Thermostatic Settings are User-Definable and Nonvolatile Can Be Used in a Wide Variety of Applications Supply Voltage Range Covers From 2.7V to 5.5V Data is Read From/Written Via a 3-Wire Serial Interface (CLK, DQ, Active-Low RST ) Saves Space Requires No External Components 8-Pin DIP or SOIC (208-mil) Packages

DS1620: Functional Block Diagram Applications/Uses Consumer Products Industrial Systems Thermometers Thermostatic Controls

DataSheet

Parametrics

Quality and Environmental Data

• DS1620.pdf

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• DS1726：High-Precision 3-Wire Digital Thermometer and Thermostat

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