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Temperature Sensor Measurement
Variable Speed DC Fan Control using the MC9RS08KA2, Rev. 0
Freescale Semiconductor 23
Appendix A.
Schematic
R2
1
2
10K
220
R1
1
2
C2
1
2
2u2F/25V
C3
1
2
2u2F/25V
R8
12
1K5
22nF
C7
1
2
10K
VR1
1
2
3
NDS7002A
Q3
1
2
3
4K7(1%)
R10
1
2
PA3/AO/BKGD
PA2/K2/RST
VDD
VSS PA5/K5
PA4/K4
PA1/K1/A-
PA0/K0/A+
9RS08KA2DN
U1
1
2
3
45
6
7
8
FMMT491A
Q1
1
2
3
R7
12
1K5
FMMT491A
Q2
1
2
3
R6
12
1K5
C4
1
2
2u2F/25V
LL4148
D3
12
R9
1
2
7.5K(1%)
LL4148
D2
12
P1
1
2
BUZ1
1
2
0.1uF
DC1
1
2
ZMM5231B
Z1
12
P4
1
2
3
4
C6
1
2
1uF/10V
P3
1
2
3
4
5
LL4148
D1
12
12V
12V
12V
12V
OUT1
OUT2
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
BUZZER
BUZZER
SENSOR
L2
HALL
HALL
HALL
L1
5V
5V
5V
5V
5V
5V
5V
12V_IN
HALL
GND
L2
L1
COM
SPEED CONTROL
ICP CONNECTOR
5V
GND
VPP
BKGD
BLDC FAN CONNECTOR
GND
12V