Asus A6J - Fan Speed Control

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Fan Speed Control
CPU FAN
Using a OP AMP and
fine-tuning the level,
we can improve the fan
speed accuracy.
Place U401 near CON401
Open-drain
------------------OTHER SIGNALS
12 mils
===============GND
10 mils
=========H_THERMDA(10 mils)
10 mils
=========H_THERMDC(10 mils)
10 mils
=========GND
12 mils
---------------------OTHER SIGNALS
Avoid BPSB,Power
Route H_THERMDA and H_THERMDC
on the same layer
SMBus Address: 5Ch
NTD. 20.64
Pin 10 & Pin 24 set inverting PWM Mode
Set INV=1 to invert PWM output
Monitors processor core
voltage (0 – 3V)
Custom
Tuesday, November 22, 2005
ASUSTeK COMPUTER INC
THER-SENSOR,FAN
2.0
A6J
Marco Chen
463
<Variant Name>
Size Project Name
Rev
Date: Sheet of
Title :
Engineer:
ADT_D2-
FAN_PWM#
ADT_D2+
ADT_D1+
ADD_SEL_EN#
SMBALERT#
FAN0_TACH
ADD_SEL_EN#
ADT_D1-
FAN_PWM#
FAN0_TACH
OVER_TEMP#
H_PROCHOT_S#
OVER_TEMP#
+V5S_FAN
GND
+3VS GND
GND
GND
GND
+3VS_FAN
+V5S_FAN
GND
+5VS
+3VS
GND
GND
GND
+3VS
+3VS
+V5S_FAN
+VCORE
GND
+3VS
GND
+12V
+3VS_FAN
GND
GND
HOLD1
HOLD2
CON401
1
2
3
45
U402
ADT7463ARQZ
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
SDA
SCL
GND
VCC
VID0
VID1
VID2
VID3
TACH3
PWM2/SMBALERT#
TACH1
TACH2 PWM3/ADDRESS_ENABLE#
TACH4/ADDRESS_SELECT/THERM#
D2-
D2+
D1-
D1+
VID4
5V/THERM#
12V/VID5
2.5V/SMBALERT#
Vccp
PWM1/XTO
R403 330Ohm
1 2
D402
SS0540
1 2
+
-
-
+
A+
A-
B+
B-
AO
BO
VCC
GND
U401
LM358MX
1
2
3
4
8
7
6
5
R418
100KOhm
1 2
R422
0Ohm
12
R419
20KOhm
1 2
R420
10KOhm
1 2
R414
10KOhm
12
R415
0Ohm
r0402@
1 2
C404
2.2UF/6.3V
c0603
12
C409
1000PF/50V
C0603
10%
12
R407
10KOhm
@
1 2
C408
0.1UF
c0402
12
R404
1MOhm
1 2
D401
1SS355
1 2
G
S
D
3
2
1
Q407
2N7002
1
32
R416
0Ohm
r0402
1 2
R402
10KOhm
r0402_h16
12
C402
0.1UF
c0402
12
R409
10Ohm
1 2
R401
10KOhm
r0402_h16
1 2
R421
0Ohm
12
C407
1000PF/50V
C0603
10%
12
C401 1000PF/16V
c0402
SAMSUNG/CL05B102KO5NNNC <G>
1 2
+
CE401
47UF/6.3V
12
R417 0Ohm
@
1 2
D S
G
1
2
3
Q401
SI2301BDS_T1_E3
1
2 3
WATCHDOG30
FAN_DA30
H_PROCHOT_S# 2
VGA_THRM_DA 13
CPU_THRM_DA 2
CPU_THRM_DC 2
PM_THERM# 25
VGA_THRM_DC 13
SMB_CLK5,20,21,25,39
SMB_DAT5,20,21,25,39
PWRLMT#25,57
OVERTEMP# 34