Sanyo VPC-J2 Service Manual page 6

1-5. SYA CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.
1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.
Pin Signal
/SCAN OUT 0~2
1~3
4 /SCAN OUT 3
5 P ON
PA ON
6
7 /STILL_LED
/CSTILL_LED
8
9 VSS
VDD
10
11 /MOVIE_LED
12 /STBY_LED (GREEN)
13
/STBY_LED (RED)
/AVREF_ON
14
15 SI
16
SO
17 SCK
18
PRG SI
19
PRG SO
20 PRG SCK
21 LCD_ON
22 BLON
23 CHG ON
24 VDD
25 AVSS
26~29 SCAN IN 0~3
30 INT_TEMP
31
NOT USED
32 CHG VOL
33 BATTERY
34 AVREF
35 AVDD
36 /RESET
37 XCOUT
38
XCIN
39 IC
40 XOUT
41
XIN
42 VSS
/BAT OFF
43
44 /SREQ
45 /SCAN IN6
46 CLOSE
47
/DC_IN
I/O
Key scan output
O
O Lens barrier open/close detection switch for scan output
O Digital power ON/OFF control
O
Analog power ON/OFF control
O
Still image mode LED (orange) control
O Video clip mode LED (orange) control
-
GND
-
VDD
O
Video clip mode LED (orange) control
O
Stand-by LED (green) control
O
Stand-by LED (red) control
O
A/D converter standard voltage control
I
Receiving data (from ASIC)
O
Sending data (to ASIC)
I/O
Communication clock (to ASIC)
I
Flash memory writing receiving data
O Flash memory writing sending data
I/O Flash memory writing communication clock
O
LCD power ON/OFF control 1
O
LCD backlight ON/OFF control
O Flash charge control
- VDD
- AVSS
I Key scan input
I Internal temperature detection input (analog input)
-
-
I
Storobe charge voltage detection (analog input)
I
Battery voltage detection (analog input)
-
Analog standard voltage input terminal
- A/D converter analog power terminal
I
Reset input
O Clock oscillation terminal (37.768 kHz)
I
Clock oscillation terminal
I
Flash memory writing voltage
O
Main clock oscillation terminal (4MHz)
I
Main clock oscillation terminal
-
GND
I Battery OFF detection
I
Serial communication requirement (from ASIC)
I Key scan input 6
I Lens barrier close detection switch input
I DC jack/battery detection input
– 6 –
Outline
H : ON
H : ON
L : ON
L : ON
L : ON
L : ON
L : ON
L : ON
H : ON
H : ON
H : ON
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