MAX6639ATE+ Maxim Integrated Products, MAX6639ATE+ Datasheet - Page 12

• Manufacturer Part Number: MAX6639ATE+
• Description: IC TEMP MONITOR 2CH 16-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6639ATE+

• Function: Fan Control, Temp Monitor
• Topology: ADC, PWM Generator, Tach Counter
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 150°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Table 4. Register Map (continued)
12
READ/
WRITE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
______________________________________________________________________________________
REGISTER
ADDRESS
NO.
12h
13h
14h
15h
16h
17h
20h
21h
22h
23h
24h
25h
26h
STATE
POR
0000
0000
0100
0001
1000
0010
0000
0000
0000
0000
0100
0001
1111
1111
1111
1111
1111
1111
1111
1111
0100
0000
0100
0000
0000
0000
configuration
configuration
configuration
configuration
configuration
configuration
Fan 1 cur r ent
FUNCTION
tachometer
tachometer
tach count/
tach count/
Fan 1 start
target tach
target tach
Pulses per
tach count
Pulses per
tach count
Fan 2 max
revolution/
revolution/
d uty cycl e
minimum
minimum
Fan 1
Fan 1
Fan 2
Fan 2
Fan 2
Fan 2
Fan 1
count
Fan 2
count
count
count
fan 1
fan 2
2b
2b
2a
3
1
3
RPM step-
RPM step-
RPM step-
revolution
revolution
Pulse per
Pulse per
Spin-up
Spin-up
disable
disable
size B
(MSB)
size A
(MSB)
size B
(MSB)
(MSB)
(MSB)
mode
PWM
MSB
MSB
MSB
MSB
MSB
D7
RPM step-
RPM step-
RPM step-
THERM to
full-speed
THERM to
full-speed
revolution
revolution
Step-size
Pulse per
Pulse per
enable
enable
size B
(MSB)
size A
size B
delay
(LSB)
(LSB)
D6
—
—
—
—
—
tach count
tach count
RPM step-
RPM step-
RPM step-
stretching
stretching
Fan 1 min
Fan 2 min
Step-size
disable
disable
size B
size A
size B
(MSB)
(MSB)
Pulse
delay
Pulse
D5
—
—
—
—
—
Fan 1 min
Fan 2 min
Reserved Reserved Reserved
Reserved Reserved Reserved
Step-size
step-size
step-size
step-size
B (LSB)
A (LSB)
B (LSB)
(LSB)
count
count
delay
RPM
RPM
RPM
tach
tach
D4
—
—
—
—
—
channel 1
Fan 1 min
Fan 2 min
step-size
step-size
step-size
B (MSB)
A (MSB)
B (MSB)
control
Temp
Fan 2
count
count
Start
Start
tach
tach
D3
—
—
—
—
—
channel 2
Fan 1 min
Fan 2 min
step-size
step-size
step-size
A (LSB)
control
Temp
Fan 2
count
count
Start
Start
tach
tach
D2
—
—
—
—
—
B
B
Start step-
Start step-
frequency
frequency
Fan 1 min
Fan 2 min
Fan PWM
Fan PWM
(MSB)
(MSB)
size B
range
select
size B
100%
count
count
PWM
cycle
RPM
duty
tach
tach
D1
—
—
—
—
—
M i ni m um fan
si ze B ( LS B)
si ze B ( LS B)
value in 22h
RP M r ang e
0 = 0%, 1=
tach count
tach count
S tar t step -
Fan P WM
fr eq uency
S tar t step -
Fan P WM
fr eq uency
Fan 1 mi n
Fan 2 mi n
sp eed :
( LSB)
select
( LSB)
( LSB)
( LSB)
LS B
LS B
LS B
LS B
LS B
D 0