12 Application Circuit
VCC3V
Example 1:
If use THERM# and ALERT#
TEMPERATURE MONITOR (CPU THERMAL DIODE)
VCC3V
C2
THERDA
D1+
0.1u
R2
R3
THERM#/PWM
ALERT#/TACH
R4 4.7K
R5 4.7K
4.7K 4.7K
C1
AGND
3300pF
THERDC
U1
1
2
3
4
8
7
6
5
SCLK
VCC
D1+
SCLK
SDAT
D1+
SDATA
D2+
ALERT#/TACH
AGND
Example 2:
D2+ ALERT#/TACH
THERM#/PWM
THERM#/PWM GND
F75386
TEMPERATURE MONITOR (2N3906)
D1+
VCC3V
+12V
4.7K
Q1
C3
R18
R19
2N3906
3300pF
AGND
Q2
4.7K
PNP
R25
10K
R20
D1
4.7K
C8
JP1
R22
27K
ALERT#/TACH
R24
Q3
NMOS
+
3
2
1
R23
THERM#/PWM
330
47U
10K
+12V
C10
0.1U
CON3
D2
R21
4.7K
FAN Circuit for High PWM Frequency
JP2
R30
27K
ALERT#/TACH
3
2
1
R28
10K
CON3
C11
0.1U
R27
470
VCC3V
R26
10
THERM#/PWM
Q4
NPN
Title
Feature Integration Technology Inc.
FAN Circuit for Low PWM Frequency
Size
A
Document Number
Rev
0.1
F75386 Application Circuit
Date:
Tuesday, February 15, 2005
Sheet
1
of
1
-1-
July, 2007
V0.27P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
