DS1775_02 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – SOT23-5 Digital Thermometer and Thermostat

PRODUCT PREVIEW
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FEATURES
§ Temperature measurements require no
external components
§ Measures temperatures from –55°C to
+125°C. Fahrenheit equivalent is –67°F to
257°F
§ Thermometer accuracy is ±2.0°C
§ Thermometer resolution is configurable from
9 to 12 bits (0.5°C to 0.0625°C resolution)
§ Thermostat settings are user definable
§ Data is read from/written to via a 2–wire
serial interface
§ Wide power supply range (2.7V – 5.5V)
§ Software compatible with DS75 2–Wire
Thermal Watchdog in thermometer mode
§ Space–conscious SOT23–5 package with
low thermal time constant
DS1775
SOT23-5 Digital Thermometer
and Thermostat
PIN ASSIGNMENT
SCL 1 _{5 SDA}
GND 2
O.S. 3 4 V_DD
DS1775R
SOT23-5
PIN DESCRIPTION
GND
Ground
SCL
2–Wire Serial Clock
SDA
2–Wire Serial Data Input/Output
V_DD
Power Supply Voltage
O.S.
Thermostat Output Signal
DESCRIPTION
The DS1775 SOT23-5 Digital Thermometer and Thermostat provides temperature readings which
indicate the temperature of the device. Thermostat settings and temperature readings are all
communicated to/from the DS1775 over a simple 2–wire serial interface. No additional components are
required; the device is truly a “temperature–to–digital” converter.
For applications that require greater temperature resolution, the user can adjust the readout resolution
from 9 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be
detected quickly.
The open–drain thermal alarm output, O.S., becomes active when the temperature of the device exceeds a
user–defined temperature T_OS. The number of consecutive faults required to set O.S. active is
configurable by the user. The device can also be configured in the interrupt or comparator mode, to
customize the method which clears the fault condition.
As a digital thermometer, the DS1775 is software compatible with the DS75 2–Wire Thermal Watchdog.
The DS1775 is assembled in a compact SOT23–5 package allowing for low–cost thermal
monitoring/control in space–constrained applications. The low thermal mass allows for time constants
previously only possible with thermistors.
Applications for the DS1775 include personal computers/servers/workstations, cellular telephones, office
equipment, or any thermally–sensitive system.
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