LM64 datasheet(1/29 Pages) NSC

部件名	LM64

功能描述	짹1째C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO?셲

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制造商	NSC [National Semiconductor (TI)]

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LM64

±1˚C Remote Diode Temperature Sensor with PWM Fan

Control and 5 GPIO’s

General Description

The LM64 is a remote diode temperature sensor with PWM

fan control. The LM64 accurately measures its own tempera-

ture and that of a remote diode. The LM64 remote tempera-

ture accuracy is factory trimmed for a MMBT3904 diode-

connected

transistor

with

a

16˚C

offset

for

high

temperatures. T

ACTUAL DIODE JUNCTION =TLM64 + 16˚C

The LM64 features a PWM, open-drain, fan control output, 5

GPIO (General Purpose Input/Output) and 5 GPD (General

Purpose Default) pins. The 8-step Lookup Table allows for a

non-linear fan speed vs. temperature transfer function often

used to quiet acoustic fan noise.

Features

n

Accurately senses remote and local diode temperatures

n

Integrated PWM fan speed control output

n

Programmable 8-step Lookup Table for quieting fans

n

ALERT and T_Crit open-drain outputs

n

Tachometer input for measuring fan RPM

n

10 bit plus sign remote diode temperature data format,

with 0.125˚C resolution

n

SMBus 2.0 compatible interface, supports TIMEOUT

n

5 General Purpose Input/Output pins

n

5 General Purpose Default input pins

n

24-pin LLP package

Key Specifications

n

Remote Diode Temperature Accuracy (includes

quantization error)

Ambient Temp

Diode Temp

Max Error

30˚C to 50˚C

120˚C to 140˚C

±1.0˚C (max)

0˚C to 85˚C

25˚C to 140˚C

±3.0˚C (max)

n

Local Temp Accuracy (includes quantization error)

Ambient Temp

Max Error

25˚C to 125˚C

±3.0˚C (max)

n

Power Supply Requirements

Supply DC Voltage

3.0 V to 3.6 V

Supply DC Current

1.1 mA (typ)

Applications

n

Computer Processor Thermal Management

n

Graphics Processor Thermal Management

n

Voltage Regulator Modules

n

Electronic Instrumentation

n

Power Supplies

n

Projectors

Connection Diagram

20065501

December 2003

DS200655

www.national.com

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