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DS1721

Dallas
Part Number DS1721
Manufacturer Dallas
Description 2-Wire Digital Thermometer and Thermostat
Published Aug 15, 2005
Detailed Description DS1721 2-Wire Digital Thermometer and Thermostat www.dalsemi.com FEATURES Temperature measurements require no external ...
Datasheet PDF File DS1721 PDF File

DS1721
DS1721

Overview
DS1721 2-Wire Digital Thermometer and Thermostat www.
dalsemi.
com FEATURES Temperature measurements require no external components with ±1°C accuracy Measures temperatures from -55°C to +125°C; Fahrenheit equivalent is -67°F to +257°F Temperature resolution is configurable from 9 to 12 (default) bits (0.
5°C to 0.
0625°C resolution) Maximum conversion time (9-bit resolution) of 150 ms Thermostatic settings are user-definable Data is read/written via a 2-wire serial interface (open drain I/O lines); 3-bit addressability Wide power supply range (2.
7V - 5.
5V) Applications include personal computers, cellular telephones, office equipment, or any thermally sensitive system 8-pin, 150-mil SOIC package and 8-pin µSOP package PIN ASSIGNMENT SDA SCL TOUT GND 1 2 3 4 8 7 6 5 VDD A0 A1 A2 SDA SCL TOUT GND 1* 2 3 4 8 7 6 5 VDD A0 A1 A2 DS1721S 8-Pin SOIC (150-mil) DS1721U 8-PIN µ-SOP PIN DESCRIPTION SDA SCL GND TOUT A0 A1 A2 VDD - 2-Wire Serial Data Input/Output - 2-Wire Serial Clock - Ground - Thermostat Output Signal - Chip Address Input - Chip Address Input - Chip Address Input - Power Supply Voltage (+5V) DESCRIPTION The DS1721 2-Wire Digital Thermometer and Thermostat provides 12-bit temperature readings which indicate the temperature of the device.
Thermostatic settings and temperature readings are all communicated to/from the DS1721 over a simple 2-wire serial interface.
No additional components are required; the device is truly a “temperature-to-digital” converter.
The DS1721 has three address bits that allow a user to multidrop up to eight sensors along the 2-wire bus, greatly simplifying the bussing of distributed temperature sensing networks.
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 is equal to or below the user-defined temperature TL, allowing for any hysteresis necessary.
The active state of TOUT is configurable by the user.
For applicat...


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