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LM64CILQF-LM64CILQ-F
±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's
LM64
±1˚C Remote Diode Temperature Sensor with PWM Fan
Control and 5 GPIO’s
General DescriptionThe LM64isa remote diode temperature sensor with PWM
fan control. The LM64 accurately measuresits own tempera-
ture and thatofa remote diode. The LM64 remote tempera-
ture accuracyis factory trimmedfora MMBT3904 diode-
connected transistor witha 16˚C offset for high
temperatures. TACTUAL DIODE JUNCTION =TLM64+ 16˚C
The LM64 featuresa PWM, open-drain,fan control output,5
GPIO (General Purpose Input/Output) and5 GPD (General
Purpose Default) pins. The 8-step Lookup Table allowsfora
non-linearfan speedvs. temperature transfer function often
usedto quiet acoustic fan noise.
Features Accurately senses remote and local diode temperatures Integrated PWM fan speed control output Programmable 8-step Lookup Tablefor quieting fans ALERT and T_Crit open-drain outputs Tachometer inputfor measuring fan RPM10bit plus sign remote diode temperature data format,
with 0.125˚C resolution SMBus 2.0 compatible interface, supports TIMEOUT5 General Purpose Input/Output pins5 General Purpose Default input pins 24-pin LLP package
Key Specifications Remote Diode Temperature Accuracy (includes
quantization error)
Ambient Temp Diode Temp Max Error30˚Cto 50˚C 120˚Cto 140˚C ±1.0˚C (max)
0˚Cto 85˚C 25˚Cto 140˚C ±3.0˚C (max) Local Temp Accuracy (includes quantization error)
Ambient Temp Max Error25˚Cto 125˚C ±3.0˚C (max) Power Supply Requirements
Supply DC Voltage 3.0Vto 3.6V
Supply DC Current 1.1 mA (typ)
Applications Computer Processor Thermal Management Graphics Processor Thermal Management Voltage Regulator Modules Electronic Instrumentation Power Supplies Projectors
Connection DiagramDecember 2003
LM64
1˚C
Remote
Diode
emperature
Sensor
with
PWM
Fan
Control
and
GPIO’
