DS1621S+FEATURES

    § 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）

    DS1621S+DESCRIPTION

    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.

    DS1621S+PIN ASSIGNMENT

    PIN DESCRIPTION

    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