Rainbow-electronics MAX6641 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX6641 temperature sensor and fan controller

accurately measures the temperature of its own die and

the temperature of a remote pn junction. The device

reports temperature values in digital form using a 2-wire

serial interface. The remote pn junction is typically the

emitter-base junction of a common-collector pnp on a

CPU, FPGA, or ASIC.

The 2-wire serial interface accepts standard System

Management Bus (SMBus)

write byte, read byte,

send byte, and receive byte commands to read the

temperature data and program the alarm thresholds.

The temperature data controls a PWM output signal to

adjust the speed of a cooling fan, thereby minimizing

noise when the system is running cool, but providing

maximum cooling when power dissipation increases.

The device also features an over-temperature alarm

output to generate interrupts, throttle signals, or shut

down signals. The MAX6641 operates from supply volt-

ages in the 3.0V to 5.5V range and typically consumes

500µA of supply current.

The MAX6641 is available in a slim 10-pin µMAX

pack-

age and is available over the automotive temperature

range (-40°C to +125°C).

Applications

Desktop Computers

Notebook Computers

Workstations

Servers

Networking Equipment

Industrial

Features

♦ Tiny 3mm x 5mm µMAX Package

♦ Thermal Diode Input

♦ Local Temperature Sensor

♦ Open-Drain PWM Output for Fan Drive

♦ Programmable Fan Control Characteristics

♦ Automatic Fan Spin-Up Ensures Fan Start

♦ ±1°C Remote Temperature Accuracy (+60°C to

+145°C)

♦ Controlled Rate of Change Ensures Unobtrusive

Fan-Speed Adjustments

♦ Temperature Monitoring Begins at Power-On for

Fail-Safe System Protection

♦ OT Output for Throttling or Shutdown

MAX6641

SMBus-Compatible Temperature Monitor with

Automatic PWM Fan-Speed Controller

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3304; Rev 0; 5/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

SMBus

ADDRESS

MAX6641AUB90

-40°C to

+125°C

10 µMAX

1001 000x

MAX6641AUB92

-40°C to

+125°C

10 µMAX

1001 001x

MAX6641AUB94

-40°C to

+125°C

10 µMAX

1001 010x

MAX6641AUB96

-40°C to

+125°C

10 µMAX

1001 011x

PWMOUT

SMBDATA

SMBCLKGND

DXP

DXN

I.C.

MAX6641

µMAX

TOP VIEW

I.C.OT

Pin Configuration

µMAX is a registered trademark of Maxim Integrated Products, Inc.

SMBus is a trademark of Intel Corp.

Typical Application Circuit appears at end of data sheet.

1 2 3 4 5 6 ... 16 17

Resumo do Conteúdo

Página 1 - Pin Configuration

General DescriptionThe MAX6641 temperature sensor and fan controlleraccurately measures the temperature of its own die andthe temperature of a remote

Página 2 - ELECTRICAL CHARACTERISTICS

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller10 _________________________________________________________________

Página 3 - MAX6641 toc03

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller____________________________________________________________________

Página 4 - = 3.3V, T

frequency setting is used for controlling fans that havelogic-level PWM input pins for speed control. Duty-cycle resolution is decreased from 2/240 to

Página 5 - Pin Description

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller____________________________________________________________________

Página 6 - Table 1. Register Functions

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller14 _________________________________________________________________

Página 7

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller____________________________________________________________________

Página 8

Twisted-Pair and Shielded CablesUse a twisted-pair cable to connect the remote sensorfor remote-sensor distance longer than 8in or in verynoisy enviro

Página 9 - Register Descriptions

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed ControllerMaxim cannot assume responsibility for use of any circuitry other th

Página 10

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller2 __________________________________________________________________

Página 11 - Register (0Fh)

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller____________________________________________________________________

Página 12 - PWM Output

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller4 __________________________________________________________________

Página 13

Detailed DescriptionThe MAX6641 temperature sensor and fan controlleraccurately measures the temperature of its own die andthe temperature of a remote

Página 14 - Applications Information

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller6 __________________________________________________________________

Página 15 - Manufacturers

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller____________________________________________________________________

Página 16 - Chip Information

MAX6641SMBus-Compatible Temperature Monitor withAutomatic PWM Fan-Speed Controller8 __________________________________________________________________

Página 17 - Package Information

Register DescriptionsTemperature Registers (00h, 01h)These registers contain the 8-bit results of the tempera-ture measurements. Register 00h contains

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Rainbow-electronics MAX6641 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX6641. Rainbow Electronics MAX6641 User Manual Manual do Utilizador

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Rainbow-electronics MAX6641 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX6641. Rainbow Electronics MAX6641 User Manual Manual do Utilizador

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