DS1620+

BENEFITS AND 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) o 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, RST )

■ Saves Space 

○ Requires No External Components 

○ 8-Pin DIP or SOIC (208-mil) Packages

APPLICATIONS 

⋅ Thermostatic Controls 

⋅ Industrial Systems 

⋅ Consumer Products 

⋅ Thermometers

PIN ASSIGNMENT

PIN DESCRIPTION

DESCRIPTION

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.

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