MAX6639 datasheet(6/22 Pages) MAXIM | 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

6 page

Detailed Description

The MAX6639 monitors its own temperature and a

remote-diode-connected transistor or the temperatures

of two external-diode-connected transistors, which typi-

cally reside on the die of a CPU or other integrated cir-

cuit. The 2-wire serial interface accepts standard

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 a programmable

alarm output can be used to generate interrupts, throt-

tle 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. RPM feedback

allows the MAX6639 to control the fan’s actual speed.

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

_______________________________________________________________________________________

GND

SMBus

INTERFACE AND

REGISTERS

LOGIC

PWM

GENERATOR

BLOCK

VCC

TEMPERATURE

PROCESSING

BLOCK

SDA

SCL

ADD

DXP1

DXN

PWM1

PWM2

TACH1

TACH2

DXP2

THERM

FANFAIL

ALERT

MAX6639

Block Diagram

Write Byte Format

Read Byte Format

Send Byte Format

Receive Byte Format

Slave Address: equiva-

lent to chip-select line of

a 3-wire interface

Command Byte: selects which

Data Byte: data goes into the register

set by the command byte (to set

thresholds, configuration masks, and

sampling rate)

Slave Address: equiva-

lent to chip-select line

Command Byte: selects

which register you are

reading from

Slave Address: repeated

due to change in data-

flow direction

Data Byte: reads from

the register set by the

command byte

Command Byte: sends com-

mand with no data, usually

used for one-shot command

Data Byte: reads data from

the register commanded

by the last read byte or

write byte transmission;

also used for SMBus alert

response return address

S = START CONDITION

SHADED = SLAVE TRANSMISSION

P = STOP CONDITION

/// = NOT ACKNOWLEDGED

Figure 1. SMBus Protocols

ADDRESS

ACK

DATA

///

7 bits

8 bits

ACK

COMMAND

ACK

8 bits

ADDRESS

7 bits

ACK

DATA

8 bits

ACK

COMMAND

8 bits

ACK

ADDRESS

7 bits

ADDRESS

ACK

COMMAND

ACK

ADDRESS

7 bits

8 bits

7 bits

ACK

DATA

8 bits

///

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