DS1775 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – SOT23-5 Digital Thermometer and Thermostat

GENERAL DESCRIPTION
The DS1775 digital thermometer and thermostat
provides temperature readings that indicate the
device’s temperature. 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 5-pin SOT23 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
• Personal Computers/Servers/Workstations
• Cell Phones
• Office Equipment
• Any Thermally-Sensitive System
DS1775
Digital Thermometer
and Thermostat in SOT23
FEATURES
• Temperature Measurements Require No
External Components
• Measures Temperatures from -55°C to
+125°C (-67°F to +257°F)
• ±2.0°C Thermometer Accuracy
• Thermometer Resolution is Configurable
from 9 Bits to 12 Bits (0.5°C to 0.0625°C
Resolution)
• User-Definable Thermostat Settings
• Data is Read From/Written to Through a
2-Wire Serial Interface
• 2.7V to 5.5V Wide Power-Supply Range
• Software Compatible with DS75 2-Wire
Thermal Watchdog in Thermometer Mode
• Space-Conscious 5-Pin SOT23 Package with
Low Thermal Time Constant
PIN CONFIGURATION
SCL 1 _{5 SDA}
GND 2
O.S. 3 4 V_DD
SOT23
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 appears at end of data sheet.
1 of 14
19-6687; Rev 5/13