ds1775r Maxim Integrated Products, Inc., ds1775r Datasheet
ds1775r
Manufacturer Part Number
ds1775r
Description
Tiny Digital Thermometer And Thermostat
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS1775R.pdf
(14 pages)
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FEATURES
§ Temperature measurements require no
§ Measures temperatures from –55°C to
§ Thermometer accuracy is ±2.0°C
§ Thermometer resolution is configurable from
§ Thermostat settings are user definable
§ Data is read from/written to via a 2–wire
§ Wide power supply range (2.7V – 5.5V)
§ Software compatible with DS75 2–Wire
§ Space–conscious SOT23–5 package with
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
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.
www.maxim-ic.com
external components
+125°C. Fahrenheit equivalent is –67°F to
257°F
9 to 12 bits (0.5°C to 0.0625°C resolution)
serial interface
Thermal Watchdog in thermometer mode
low thermal time constant
OS
. The number of consecutive faults required to set O.S. active is
1 of 14
SOT23-5 Digital Thermometer
PIN ASSIGNMENT
PIN DESCRIPTION
GND
SCL
SDA
V
O.S.
DD
GND
SCL
O.S.
DS1775R
SOT23-5
1
2
3
Ground
2–Wire Serial Clock
2–Wire Serial Data Input/Output
Power Supply Voltage
Thermostat Output Signal
4
5
and Thermostat
V
SDA
DD
PRODUCT PREVIEW
DS1775
080602
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