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DS1775, DS1775R Tiny Digital Thermometer and Thermostat

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Status

Active: In Production.

Description

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The DS1775 digital thermometer and thermostat is offered in a tiny 5-pin SOT-23 package and provides ±2°C accuracy over a -10°C to +85°C range. Thermometer data is read out over a 2-wire serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable). The DS1775 is available with eight different hard-wired addresses, allowing up to eight DS1775 devices to operate on the same bus. The eight versions of the DS1775 are:

Part Number Address

DS1775R 000

DS1775R1 001

DS1775R2 010

DS1775R3 010

DS1775R4 100

DS1775R5 101

DS1775R6 110

DS1775R7 111

The DS1775 offers thermostatic functionality with over-temperature (T_OS) and under-temperature (T_HYST) user-programmable trip-points stored in on-chip SRAM. The two trip-points provide programmable thermostat hysteresis: the thermostat output is asserted when the measured temperature exceeds T_OS and it remains active until the temperature falls below T_HYST.

The DS1775 is functionally compatible with the DS75 and the LM75.

Key Features Applications/Uses

Tiny 5-pin SOT-23 package
±2°C accuracy from -10°C to +85°C
Measures temperatures from -55°C to +125°C (-67°F to +257°F)
9- to 12-bit user-configurable resolution
Dedicated thermostatic logic output
Thermostatic settings are user-programmable
Data is transferred over 2-wire/SMBus interface
Eight address versions allow up to eight DS1775 to operate on one bus
Functionally compatible with the DS75 and LM75
2.7V to 5.5V supply range

Computer Graphics Systems
Industrial Instruments
Notebook Computers
Portable Terminals
Storage Area Networks (SANs)