DS1775 Datasheet, PDF (1/13 Pages) Dallas Semiconductor – SOT23-5 Digital Thermometer and Thermostat

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PRODUCT PREVIEW
PRELIMINARY
DS1775
SOT23-5 Digital Thermometer
and Thermostat
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
PIN ASSIGNMENT
SCL ₁ 5 _SDA
GND ₂
O.S. 3 4 _VDD
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
ORDERING INFORMATION
Part Number Address
Part Number Address
DS1775R/TRL 000
DS1775R/TR4 100
DS1775R/TR1 001
DS1775R/TR5 101
DS1775R/TR2 010
DS1775R/TR6 110
DS1775R/TR3 011
DS1775R/TR7 111
* "R" denotes SOT 23-5 Package
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.
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