Sanyo VPC-MZ3EX Service Manual page 7

1-5. SY1 CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SY1 circuit board, refer to the block diagram. The SY1 circuit board 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
1~4 SCAN OUT 0~3
5 P ON
PA ON
6
7
LCD ON
BL_ON
8
9 VSS
VDD
10
SELF_LED
11
STBY_LED (GREEN)
12
13
STBY_LED (RED)
AVREF_ON
14
15 SI
16 SO
17 SCK
18
PRG SI
19 PRG SO
20 PRG SCK
21 NOT USED
22
NOT USED
23 CHG ON
24 VDD
25 AVSS
26~29 SCAN IN 3~0
30 INT_TMP
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 INTP3
NOT USED
47
48 BOOT
I/O
O Key matrix output
Digital power ON/OFF control
O
O Analog power ON/OFF control
LCD power ON/OFF control
O
LCD backlight ON/OFF
O
- GND
- VDD
Self-timer LED control
O
O Stand-by LED (green) control
O Stand-by LED (red) control
O A/D converter standard voltage control
I Receiving data (from ASIC)
Sending data (to ASIC)
O
I/O Communication clock (to ASIC)
I Flash memory write receiving data
Flash memory write sending data
O
Flash memory write communication clock
I/O
-
-
- -
Flash charge control
O
VDD
-
Analog GND
-
Key scan input
I
I Internal temperature detection input (analog input)
- -
I Storobe charge voltage detection (analog input)
Battery voltage detection (analog input)
I
Analog standard voltage input terminal
-
- A/D converter analog power terminal
I Reset input
Clock oscillation terminal (32.768 kHz)
O
Clock oscillation terminal
I
I Flash memory writing voltage
O
Main clock oscillation terminal (4MHz)
Main clock oscillation terminal
I
- GND
Battery OFF detection
I
I Serial communication requirement (from ASIC)
Key scan input 6
I
-
I
-
-
Compulsion boot control
I/O
– 7 –
Outline
H : ON
H : ON
H : ON
L : ON
L : ON
L : ON
L : ON
H : ON
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