DS1621 Digital Thermometer and Thermostat

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.

Technical Specification

• 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)
• Converts Temperature to Digital Word in Less than 1s
• Thermostatic Settings are User Definable And Nonvolatile
• Power Supply Range (2.7V to 5.5V)
• Data is Read From/Written Via a 2-Wire Serial Interface (Open Drain I/O Lines)
• Temperature Measurements Require No External Components