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6
﹒
Micro
(
IC301
)﹒
6.1
HS/VS
Processor
﹒
HS/VS
input
pin39
(
HS
)
﹐
pin40
(
VS
)﹐
IC301 individually to work on frequency
﹐
polarity
﹐
process of H+V
and
power
saving
﹐
then output horizontal sync
(
pin33
)
and vertical sync
(
pin32
)
of positive polarity to
IC401
TDA9113
pin1
﹐
pin2
﹒
6.2
PWM
Control
﹒
The PWM control of IC301 is pin1
(
Brightness
)
and pin3
(
Rotation
)﹐
the PWM output via R
﹐
C after
rectified may control each function
﹒
6.3 Power saving / Mute / LED control
﹒
IC301 pin17
﹐
pin18 are power saving control pin
﹐
the condition of power saving and mode change
﹐
pin19 will
change from Low to Hi and active Mute function
﹒
Normal
Active
Mute L H
SUS H L
(
Off mode
)
PD H L
(
Off mode
)
IC301
pin17
(
SUS
)
function as LED control
﹐
the mode is as listed
:
Power On
Power saving
Over range freq
﹒
Pin17 Hi
Low
Low
6.4
CS
control
(
CS1 ~ CS3
)﹒
To count H-SYNC by the output frequency
﹐
then output the cumulating as listed
:
Freq.
CS1 CS2 CS3
< 30K
1
0
0
30K~34K 1 0 0
34K~36.5K 1 1 0
36.5K~41K 1 1 1
41K~52K 0 0 0
52K~62K 0 0 1
62K~72K 0 1 0
> 72K
0
1
1
6.5
Key
Control
﹕
IC301 pin26~pin29 function as DAC switch input to control OSD display function
﹒
Pin26
:
﹒
Pin27
:▽﹒
Pin28
:△﹒
Pin29
:
﹒
6.6
I
2
C Bus
﹒
IC301 have two groups I
2
C bus to control E
2
PROM
﹐
IC401 deflection IC
﹐
Auto aliment
﹐
IC601 pre-AMP
﹐
IC602 OSD IC function
﹒
1
2
23
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
A91f+-1
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