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ii.
Switching power ON
When Switching power receives the start order by 2
Then by Q25 2N7002 (signal mark V12_ON) and 1
provides +12V (POWER STREE, refer to page 20 of schematic) and +24V , turn on the circuit of
+5V(signal mark VCC).
J11
V12_ON
1
2
3
4
5
6
7
8
9
10
11
12
13
To Switching Power
iii.
VCC ON/OFF
+5V (signal mark VCC) turn on when V12_ON=Hi, Every batches of digital board circuit would be
able to process Power ON procedure.
+5V Always ON
V12_ON
iv.
CPU RESET
U18 PW328 CPU will output a Hi level to trigger other IC to reset when +5V, +12V and +24V start to
work. Then Firmware starts to read the data of U33 via U29 PWM2030 CPU and transmits data via
I2C BUS and sends control signal to run the TURN ON
ViewSonic Corporation
Hi=POWER ON
V12IN
0_NC
R318
C488
10U
0
R319
Vsub
VCC ON/OFF
Vsub
L123
PBY32-190
Q24
3904
R343
10K
nd
pin of U41 (signal mark POWERON),
st
pin of J11 to control Switching Power Model
V5up
R298
5.6K
Q15
2N7002
G
2.2K
C482
.1
Lo=POWER ON
AP4435M
1
S1
2
S1
3
S1
R340
4
G1
10K
B
C510
470U
digital board circuit
procedure.
8
Confidential - Do Not Copy
U41
43
P0.0/AD0
42
P0.1/AD1
41
P0.2/AD2
40
P0.3/AD3
39
P0.4/AD4
38
P0.5/AD5
37
P0.6/AD6
36
P0.7/AD7
PWRON
2
R300
P1.0
3
P1.1
4
P1.2
5
P1.3
6
P1.4
7
P1.5
8
P1.6
9
P1.7
21
XTAL1
20
XTAL2
35
EA/VPP
10
RST
Q23
VCC
8
D1
7
D1
6
D1
5
D1
To every batches of
N4261w-1M
V5up
SM5964C40J
24
P2.0/A8
25
P2.1/A9
26
P2.2/A10
27
P2.3/A11
28
P2.4/A12
29
P2.5/A13
30
P2.6/A14
31
P2.7/A15
11
P3.0/RXD
13
P3.1/TXD
14
P3.2/INT0
15
P3.3/INT1
16
P3.4/T0
17
P3.5/T1
18
P3.6/WR
19
P3.7/RD
33
ALE/PROG
32
PSEN
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