Rainbow Electronics MAX1669 - Manual (Page 17)

MAX1669
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
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MAX1669
ADD1
ADD0
SYNC
I/O1
ADD2
V CC
+12V
AGND PGND
N-CH
IRF7201
SYSTEM POWER
GROUND
FAN
DXP
0.1 µF
DXN
+5V
SMBCLK
SMBDATA
ALERT
2200pF
2N3906
10k 10k 10k 10k
OVERT
38k
38k
100k
I/O2
MAX1669
ADD1
ADD0
SYNC
I/O1
ADD2
V CC
+12V
AGND PGND
P-CH
IRF7205
SYSTEM POWER
GROUND
FAN
5.1V
ZENER
DXP
0.1 µF
DXN
+5V
SMBCLK
SMBDATA
ALERT
10k 10k 10k 10k
OVERT
22k
33k
100k
I/O2
2200pF
2N3906
Figure 5. Linear Fan Control (DAC Mode) with Fan “Off” at Power-Up
Figure 6. Linear Fan Control (DAC Mode) with Fan “On” at Power-Up