MAX6639FAEE(2008) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

MFG CO.

MAX6639FAEE
(Rev.:2008)

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

Maxim Integrated 

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

Table 4. Register Map (continued)

READ/

WRITE

REGISTER

NO.

ADDRESS

POR

STATE

FUNCTION

D7

D6

D5

D4

D3

D2

D1

D0

R/W

12h

0000

0000

Fan 1

configuration

2b

RPM step-

size B

(MSB)

RPM step-

size B

RPM step-

size B

RPM

step-size

B (LSB)

Start

step-size

B (MSB)

Start

step-size

B

Start step-

size B

Start step-

size B (LSB)

R/W

13h

0100

0001

Fan 1

configuration

3

Spin-up

disable

THERM to Pulse

Fan PWM

full-speed stretching Reserved Reserved Reserved frequency

enable disable

(MSB)

Fan PWM

fr eq uency

( LSB)

R/W

14h

1000

0010

Fan 2

configuration

1

PWM

mode

Step-size

delay

(MSB)

Step-size

delay

Step-size Fan 2 Fan 2

delay channel 1 channel 2

(LSB) control control

RPM

range

select

RPM range

select

R/W

15h

0000

0000

Fan 2

configuration

2a

RPM step-

size A

(MSB)

RPM step-

size A

RPM step-

size A

RPM

step-size

A (LSB)

Temp Temp

step-size step-size

A (MSB) A (LSB)

PWM

100%

duty

cycle

Minimum fan

sp eed :

0 = 0%, 1=

value in 22h

R/W

16h

0000

0000

Fan 2

configuration

RPM step-

size B

RPM step-

size B

RPM step-

size B

RPM

step-size

Start

step-size

Start

step-size

Start step-

size B

Start step-

size B (LSB)

2b

(MSB)

B (LSB) B (MSB) B

R/W

17h

0100

0001

Fan 2

configuration

3

Spin-up

disable

THERM to Pulse

Fan PWM

full-speed stretching Reserved Reserved Reserved frequency

enable disable

(MSB)

Fan PWM

fr eq uency

( LSB)

R

20h

1111

1111

Fan 1

tachometer

count

MSB

—

—

—

—

—

—

LS B

R

21h

1111

1111

Fan 2

tachometer

count

MSB

—

—

—

—

—

—

LS B

Fan 1 start

R/W

22h

1111 tach count/

1111 target tach

MSB

—

—

—

—

—

—

LS B

count

Fan 2 max

R/W

23h

1111 tach count/

1111 target tach

MSB

—

—

—

—

—

—

LS B

count

Pulses per

R/W

24h

0100

0000

revolution/

fan 1

minimum

Pulse per Pulse per Fan 1 min Fan 1 min Fan 1 min Fan 1 min Fan 1 min

revolution revolution tach count tach

tach

tach

tach

(MSB) (LSB) (MSB) count count count count

Fan 1 min

tach count

( LSB)

tach count

Pulses per

R/W

25h

0100

0000

revolution/

fan 2

minimum

Pulse per Pulse per Fan 2 min Fan 2 min Fan 2 min Fan 2 min Fan 2 min

revolution revolution tach count tach

tach

tach

tach

(MSB) (LSB) (MSB) count count count count

Fan 2 min

tach count

( LSB)

tach count

R

26h

0000 Fan 1 current

0000 duty cycle

MSB

—

—

—

—

—

—

LS B

12 ______________________________________________________________________________________

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