§ Temperature measurements require no external components
§ Measures temperatures from –55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is –67°F to 257°F in 0.9°Fincrements
§ Temperature is read as a 9–bit value （2-byte transfer）
§ Wide power supply range （2.7V to 5.5V）
§ Converts temperature to digital word in 1 second
§ Thermostatic settings are user definable and nonvolatile
§ Data is read from/written via a two–wire serial interface （open drain I/O lines）
§ Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system
§ 8–pin DIP or SOIC package （150-MIL and 208-MIL）
The DS1621 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate
the temperature of the device. The thermal alarm output, TOUT, is active when the temperature of the
device exceeds a user–defined temperature TH. The output remains active until the temperature drops
below user defined temperature TL, allowing for any hysteresis necessary.
User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to
insertion in a system. Temperature settings and temperature readings are all communicated to/from the
DS1621 over a simple two–wire serial interface.
SDA - 2-Wire Serial Data Input/Output
SCL - 2-Wire Serial Clock
GND - Ground
TOUT - Thermostat Output Signal
A0 - Chip Address Input
A1- Chip Address Input
A2- Chip Address Input
VDD- Power Supply Voltage
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