MAX6639 データシートの表示（PDF） - Maxim Integrated

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MAX6639

2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

Maxim Integrated 

EVALUATION KIT AVAILABLE

MAX6639/MAX6639F

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

General Description

The MAX6639 monitors its own temperature and one

external diode-connected transistor or the temperatures

of two external diode-connected transistors, typically

available in CPUs, FPGAs, or GPUs. 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 pro-

gram the alarm thresholds. Temperature data can be

read at any time over the SMBus, and three program-

mable alarm outputs can be used to generate inter-

rupts, throttle signals, or overtemperature shutdown

signals.

The temperature data is also used by the internal dual-

PWM fan-speed controller to adjust the speed of up to

two cooling fans, thereby minimizing noise when the

system is running cool, but providing maximum cooling

when power dissipation increases. Speed control is

accomplished by tachometer feedback from the fan, so

that the speed of the fan is controlled, not just the PWM

duty cycle. Accuracy of speed measurement is ±4%.

The MAX6639 is available in 16-pin QSOP and 16-pin thin

QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V

and consumes just 500µA of supply current.

Applications

Desktop Computers

Notebook Computers

Projectors

Servers

Networking Equipment

Typical Application Circuit appears at end of data sheet.

Features

o Two Thermal-Diode Inputs

o Up to 25kHz PWM Output Frequency

o Three Selectable SMBus Addresses

o Local Temperature Sensor

o 1°C Remote Temperature Accuracy

o Two PWM Outputs for Fan Drive (Open Drain; Can

be Pulled Up to +13.5V)

o Programmable Fan-Control Characteristics

o Automatic Fan Spin-Up Ensures Fan Start

o Controlled Rate-of-Change Ensures Unobtrusive

Fan-Speed Adjustments

o ±3% Fan-Speed Measurement Accuracy

o Temperature Monitoring Begins at POR for Fail-

Safe System Protection

o OT and THERM Outputs for Throttling or Shutdown

o Measures Temperatures Up to +150°C

o MAX6639F is Optimized for n = 1.021 for Penryn

Compatibility

Ordering Information

PART

OPERATING MEASUREMENT PIN-

RANGE

RANGE PACKAGE

MAX6639AEE+

-40°C to

+125°C

0°C to +150°C 16 QSOP

MAX6639ATE+

-40°C to

+125°C

0°C to +150°C 16 TQFN-EP*

MAX6639FAEE+

-40°C to

+125°C

0°C to +150°C 16 QSOP

MAX6639FATE+

-40°C to

+125°C

0°C to +150°C 16 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Pin Configurations

TOP VIEW

PWM1 1

TACH1 2

PWM2 3

TACH2 4

FANFAIL 5

THERM 6

OT 7

VCC 8

MAX6639

QSOP

16 SCL

15 SDA

14 ALERT

13 ADD

12 DXP2

11 DXN

10 GND

9 DXP1

12 11 10 9

SCL 13

8 DXP1

SDA 14

PWM1 15

TACH1 16

MAX6639

*CONNECT EXPOSED

PAD TO GND.

7 GND

6 VCC

5 OT

1

2

3

4

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

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

19-3682; Rev 3; 4/13

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