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DS1621 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1621 Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 16 page 1 of 16 102299 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 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) 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 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. DS1621 Digital Thermometer and Thermostat www.dalsemi.com 6 3 1 2 4 8 7 5 SDA TOUT GND VDD A0 A1 A2 DS1621S 8-PIN SOIC (150-MIL) DS1621V 8-PIN SOIC (208-MIL) See Mech Drawings Section 6 3 1 2 4 8 7 5 SDA SCL TOUT GND VDD A0 A1 A2 DS1621 8-PIN DIP (300-MIL) See Mech Drawings Section SCL |
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