Rainbow-electronics MAX6651 Instrukcja Użytkownika Pobierz pdf

General Description

The MAX6650/MAX6651 fan controllers use an

SMBus™/I

C™-compatible interface to regulate and mon-

itor the speed of 5VDC/12VDC brushless fans with built-in

tachometers. They automatically force the fan’s tachome-

ter frequency (fan speed) to match a preprogrammed

value in the Fan-Speed Register by using an external

MOSFET or bipolar transistor to linearly regulate the volt-

age across the fan. The MAX6650 regulates the speed of

a single fan by monitoring its tachometer output. The

MAX6651 also regulates the speed of a single fan, but it

contains additional tachometer inputs to monitor up to four

fans and control them as a single unit when they are used

in parallel.

The MAX6650/MAX6651 provide general-purpose

input/output (GPIO) pins that serve as digital inputs,

digital outputs, or various hardware interfaces. Capable

of sinking 10mA, these open-drain inputs/outputs can

drive an LED. To add additional hardware control, con-

figure GPIO1 to fully turn on the fan in case of software

failure. To generate an interrupt when a fault condition

is detected, configure GPIO0 to behave as an active-

low alert output. Synchronize multiple devices by set-

ting GPIO2 (MAX6651 only) as an internal clock output

or an external clock input.

The MAX6650 is available in a space-saving 10-pin

µMAX package, and the MAX6651 is available in a

small 16-pin QSOP package.

________________________Applications

RAID Desktop Computers

Servers Networking

Workstations Telecommunications

____________________________Features

♦ Closed/Open-Loop Fan-Speed Control for

5V/12V Fans

♦ 2-Wire SMBus/I

C-Compatible Interface

♦ Monitors Tachometer Output

Single Tachometer (MAX6650)

Up to Four Tachometers (MAX6651)

♦ Programmable Alert Output

♦ GPIOs

♦ Hardware Full-On Override

♦ Synchronize Multiple Fans

♦ Four Selectable Slave Addresses

♦ +3V to +5.5V Supply Voltage

♦ Small Packages

10-Pin µMAX (MAX6650)

16-Pin QSOP (MAX6651)

MAX6650/MAX6651

Fan-Speed Regulators and Monitors

with SMBus/I

C-Compatible Interface

________________________________________________________________ Maxim Integrated Products 1

19-1784; Rev 1; 9/01

Ordering Information

10 µMAX

PIN-PACKAGETEMP. RANGE

-40°C to +85°C

MAX6650EUB

PART

16 QSOP-40°C to +85°C

MAX6651EEE

C is a trademark of Philips Corp.

SMBus is a trademark of Intel Corp.

MAX6650

SCL

10k

SDA

GPIO0 OUT

ADD

GND

TACH0

3V TO 5.5V

FAN

5V OR 12V

COMP

10µF

C/SMBus

INTERFACE

GPIO1

LED

FAN

FULL ON

ALERT

Typical Operating Circuit

Pin Configurations appear at end of data sheet.

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.

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Podsumowanie treści

Strona 1 - C-Compatible Interface

General DescriptionThe MAX6650/MAX6651 fan controllers use anSMBus™/I2C™-compatible interface to regulate and mon-itor the speed of 5VDC/12VDC brushle

Strona 2

across the fan until the desired speed is reached. Open-loop operation allows the µC to regulate fan speed direct-ly. The µC reads the fan speed from

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Alarm Status Register if the condition that caused thealarm is removed.TachometerThe Tachometer Count Registers record the number ofpulses on the corr

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface12 _______________________________________________________________

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behavior, a POR voltage detector monitors VCCandclears the memory if VCCfalls below 1.6V. When poweris first applied and VCCrises above 1.6V, the logi

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface14 _______________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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Temperature Monitoring and Fan ControlThe circuit shown in Figure 10 provides complete tem-perature monitoring and fan control. The MAX1617A (aremote/

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

Strona 10

up to four fans, ensuring any significant speed mis-matches can be detected.For parallel fan control while monitoring up to four fanspeeds, select the

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface2 ________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface20 _______________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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MAX6650/MAX6651The MAX6650/MAX6651 use an 8-bit counter to countthe tachometer pulses. This means the device cancount from 0 to 255 tachometer pulses

Strona 16

Setting Up AlarmsThe MAX6650/MAX6651 can be configured to generatean ALERT output on GPIO0 whenever certain events,such as control loop out of regulat

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface24 _______________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible InterfaceMaxim cannot assume responsibility for use of any circuitry other

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface4 ________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface6 ________________________________________________________________

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

Strona 24

MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface8 ________________________________________________________________

Strona 25

MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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