DS1621-Digital Thermometer & Thermostat IC

DS1621-Digital Thermometer & Thermostat        

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°F increments.
• Temperature is read as a 9-bit value (2-byte transfer).
• Wide power supply range (2.7V to 5.5V).
• Converts temperature to the digital word in less than 1 second.
• Thermostatic settings are user definable and nonvolatile.
• Data is read from/written via a 2-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 SO package (150mil and 208mil).

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 2-wire serial interface.