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LM75BIM3-LM75BIM-3-LM75BIM5-LM75BIM-5-LM75BIMM-3-LM75BIMM-5-LM75BIMMX-3-LM75BIMMX-5-LM75BIMX-3-LM75BIMX-5-LM75CIM3-LM75-CIM3-LM75CIM-3-LM75CIM-3.-LM75CIM5-LM75CIM-5-LM75CIMM-3-LM75CIMM-5-LM75CIMMX3-LM75CIMMX-3-LM75CIMMX-5-LM75CIMX-3-LM75CIMX5-LM75
Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
LM75
Digital Temperature Sensor and Thermal Watchdog with
Two-Wire Interface
General DescriptionThe LM75isa temperature sensor, Delta-Sigma analog-to-
digital converter, and digital over-temperature detector with2C® interface. The host can querythe LM75at any timeto
read temperature. The open-drain Overtemperature Shut-
down (O.S.) output becomes active when the temperature
exceedsa programmable limit. Thispin can operatein either
“Comparator”or “Interrupt” mode.
The host can program boththe temperature alarm threshold
(TOS) andthe temperatureat whichthe alarm condition goes
away (THYST).In addition, the host can read backthe con-
tentsofthe LM75’s TOS and THYST registers. Three pins (A0,
A1, A2) are available for address selection. The sensor
powersupin Comparator mode with default thresholdsof
80˚C TOS and 75˚C THYST.
The LM75’s 3.0Vto 5.5V supply voltage range, low supply
current andI2C interface makeit idealfora wide rangeof
applications. These include thermal management and pro-
tection applicationsin personal computers, electronic test
equipment, and office electronics.
Features SOP-8 and Mini SOP-8 (MSOP) packages save spaceI2C Bus interface Separate open-drain outputpin operatesas interruptor
comparator/thermostat output Register readback capability Powerup defaults permit stand-alone operationas
thermostat Shutdown modeto minimize power consumption Upto8 LM75s canbe connectedtoa single bus UL Recognized Component
Key Specifications Supply Voltage 3.0Vto 5.5V Supply Current operating 250µA (typ) mA (max)
shutdown 4µA (typ) Temperature Accuracy −25˚Cto 100˚C ±2˚C(max)
−55˚Cto 125˚C ±3˚C(max)
Applications System Thermal Management Personal Computers Office Electronics Electronic Test Equipment
Simplified Block DiagramFebruary 2004
LM75
Digital
emperature
Sensor
and
Thermal
atchdog
with
wo-W
ire
Interface
