Datasheet

2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Maxim Integrated 11
MAX6639/MAX6639F
READ/
WRITE
REGISTER
NO.
ADDRESS
POR
STATE
FUNCTION D7 D6 D5 D4 D3 D2 D1 D 0
R 00h
0000
0000
Temperature
channel 1
MSB
(+128°C)
——————
LS B
( 1° C )
R 01h
0000
0000
Temperature
channel 2
MSB
(+128°C)
——————
LS B
( 1° C )
R 02h
0000
0000
Status byte
Channel 1
ALERT
Channel 2
ALERT
Channel 1
OT
Channel 2
OT
Channel 1
THERM
Channel 2
THERM
Fan 1 fault
Fan 2
faul t
R/W 03h
0000
0011
Output mask
Channel 1
ALERT
Channel 2
ALERT
Channel 1
OT
Channel 2
OT
Channel 1
THERM
Channel 2
THERM
Fan 1 fault
Fan 2
faul t
R/W 04h
0011
0000
Global
configuration
Run
0 = run,
1= stby
POR:
1 = reset
SMBus
timeout:
0 =
enabled,
1 =
disabled
Tem p
channel 2
sour ce:
1 = l ocal ,
0 = r em ote
2
PWM
output
frequency
range
Reserved Reserved Reser ved
R 05h
0000
0000
Channel 1
extended
temperature
MSB
(0.5°C)
—
LSB
(0.125°C)
Reserved Reserved Reserved Reserved
D i od e
faul t
R 06h
0000
0000
Channel 2
extended
temperature
MSB
(0.5°C)
—
LSB
(0.125°C)
Reserved Reserved Reserved Reserved
D i od e
faul t
R/W 08h
0101
0101
Channel 1
ALERT limit
MSB——————
LS B
( 1° C )
R/W 09h
0101
0101
Channel 2
ALERT limit
MSB——————
LS B
( 1° C )
R/W 0Ah
0110
1110
Channel 1 OT
limit
MSB——————
LS B
( 1° C )
R/W 0Bh
0110
1110
Channel 2 OT
limit
MSB——————
LS B
( 1° C )
R/W 0Ch
0101
0101
Channel 1
THERM limit
MSB——————
LS B
( 1° C )
R/W 0Dh
0101
0101
Channel 2
THERM limit
MSB——————
LS B
( 1° C )
R/W 10h
1000
0010
Fan 1
configuration
1
PWM
mode
Rate of
change
(MSB)
Rate of
change
Rate of
change
(LSB)
Fan 1
channel 1
control
Fan 1
channel 2
control
RPM
range
select
RP M
r ang e
sel ect
R/W 11h
0000
0000
Fan 1
Configuration
2a
RPM step-
size A
(MSB)
RPM step-
size A
RPM step-
size A
RPM step-
size A
(LSB)
Temp
step-size
A (MSB)
Temp
step-size
A (LSB)
PWM
Polarity
M i ni m um
fan
sp eed :
0 = 0%,
1= val ue
Table 4. Register Map