DS1775

` Temperature measurements require no external components
` Measures temperatures from 55 to +125. Fahrenheit equivalent is 67°F to 257°F
` Thermometer accuracy is ±2.0
` Thermometer resolution is configurable from 9 to 12 bits (0.5 to 0.0625 resolution)
` Thermostat settings are user definable
` Data is read from/written to via a 2wire serial interface
` Wide power supply range (2.7V 5.5V)
` Software compatible with DS75 2Wire Thermal Watchdog in thermometer mode
` Spaceconscious SOT235 package with low thermal time constant

Voltage on V_DD, Relative to Ground ............................................0.3V to +7.0V
Voltage on any other pin, Relative to Ground .............................0.3V to +7.0V
Operating Temperature .............................................................55 to +125
Storage Temperature ................................................................55 to +125
Soldering Temperature .....................................................260°C for 10 seconds

* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

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 2wire serial interface. No additional components are required; the device is truly a "temperaturetodigital" 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 opendrain thermal alarm output, O.S., becomes active when the temperature of the device exceeds a userdefined temperature TOS. 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 2Wire Thermal Watchdog.

The DS1775 is assembled in a compact SOT235 package allowing for lowcost thermal monitoring/control in spaceconstrained 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 thermallysensitive system.