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MAX6640 Datasheet(PDF) 11 Page - Maxim Integrated Products

Part No. MAX6640
Description  2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6640 Datasheet(HTML) 11 Page - Maxim Integrated Products

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2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
______________________________________________________________________________________
11
READ/
WRITE
REGISTER
NO.
ADDRESS
POR
STATE
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
R
00h
0000
0000
Temperature
channel 1
MSB
(+128°C)
——
————
LSB
(1°C)
R
01h
0000
0000
Temperature
channel 2
MSB
(+128°C)
——
————
LSB
(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
fault
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
fault
R/W
04h
0011
0000
Global
configuration
Run
0 = run,
1= stby
POR
1 = reset
SMBus
timeout
0 =
enabled,
1 =
disabled
Temp
channel 2
source:
1 = local,
0 = remote
2
Reserved Reserved Reserved Reserved
R
05h
0000
0000
Channel 1
extended
temperature
MSB
(0.5°C)
LSB
(0.125°C)
Reserved Reserved Reserved Reserved
Diode
fault
R
06h
0000
0000
Channel 2
extended
temperature
MSB
(0.5°C)
LSB
(0.125°C)
Reserved Reserved Reserved Reserved
Diode
fault
R/W
08h
0101
0101
Channel 1
ALERT limit
MSB
——
————
LSB
(1°C)
R/W
09h
0101
0101
Channel 2
ALERT limit
MSB
——
————
LSB
(1°C)
R/W
0Ah
0110
1110
Channel 1 OT
limit
MSB
——
————
LSB
(1°C)
R/W
0Bh
0110
1110
Channel 2 OT
limit
MSB
——
————
LSB
(1°C)
R/W
0Ch
0101
0101
Channel 1
THERM limit
MSB
——
————
LSB
(1°C)
R/W
0Dh
0101
0101
Channel 2
THERM limit
MSB
——
————
LSB
(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
RPM
range
select
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
100% duty
cycle
Minimum
fan
speed
0 = 0%,
1= value
in 22h
Table 3. Register Map


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