SANYO VPC-MZ3EX, VPC-MZ3, VPC-MZ3GX, VAR-G6U, VAR-G6EX STROBE CIRCUIT DESCRIPTION

1-4. ST1 STROBE CIRCUIT DESCRIPTION

1. Charging Circuit

When UNREG power is supplied to the charge circuit and the
CHG signal from SY1 board becomes High (3.3 V), the charg­ing circuit starts operating and the main electorolytic capaci­tor is charged with high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.

1-1. Power switch

When the CHG signal switches to Hi, Q5407 turns ON and
the charging circuit starts operating.

1-2. Power supply filter

C5401 constitutes the power supply filter. They smooth out
ripples in the current which accompany the switching of the
oscillation transformer.

1-3. Oscillation circuit

This circuit generates an AC voltage (pulse) in order to in­crease the UNREG power supply voltage when drops in cur­rent occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omis­sion is used, the oscillation frequency changes according to
the drive conditions.

2. Light Emission Circuit

When RDY and TRIG signals are input from the ASIC expan­sion port, the stroboscope emits light.

2-1. Emission control circuit

When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.

2-2. Trigger circuit

When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is gen­erated inside the trigger circuit, and this pulse is then applied
to the light emitting part.

2-3. Light emitting element

When the high-voltage pulse form the trigger circuit is ap­plied to the light emitting part, currnet flows to the light emit­ting element and light is emitted.

Beware of electric shocks.

1-4. Oscillation transformer

The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alter­nating current by the oscillation transformer.

1-5. Rectifier circuit

The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a high­voltage direct current and is accumulated at electrolytic ca­pacitor C5412.

1-6. Voltage monitoring circuit

This circuit is used to maintain the voltage accumulated at
C5412 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417, R5419 and R5420, it is output to the SY1
circuit board as the monitoring voltage VMONIT. When this
VMONIT voltage reaches a specified level at the SY1 circuit
board, the CHG signal is switched to Low and charging is
interrupted.

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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

1~4

5

6

7

8

9

10

11

12
13

14

15

16

17

18

19

20

21

22

23

24 VDD

25 AVSS

26~29 SCAN IN 3~0

30

31 NOT USED

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

STBY_LED (GREEN)

Signal

SCAN OUT 0~3

P ON

PA ON

LCD ON

BL_ON

VSS

VDD

SELF_LED

STBY_LED (RED)

AVREF_ON

SI

SO

SCK

PRG SI

PRG SO

PRG SCK

NOT USED

NOT USED

CHG ON

INT_TMP

CHG VOL

BATTERY

AVREF

AVDD

RESET

XCOUT

XCIN

IC

XOUT

XIN

VSS

BAT OFF

SREQ

SCAN IN6

INTP3

NOT USED

BOOT

I/O

O

O

O

O

O

O

O

O

O

O

I/O

O

I/O

O

O

O

I/O

Outline

Key matrix output

Digital power ON/OFF control H : ON

Analog power ON/OFF control H : ON

LCD power ON/OFF control H : ON

LCD backlight ON/OFF

-

-

I

I

-

-

-

-

I

I

-

I

I

-

-

I

I

I

I

-

I

I

I

I

-

GND

VDD

Self-timer LED control L : ON

Stand-by LED (green) control L : ON

Stand-by LED (red) control L : ON

A/D converter standard voltage control L : ON

Receiving data (from ASIC)

Sending data (to ASIC)

Communication clock (to ASIC)

Flash memory write receiving data

Flash memory write sending data

Flash memory write communication clock

-

-

Flash charge control H : ON

VDD

Analog GND

Key scan input

Internal temperature detection input (analog input)

-

Storobe charge voltage detection (analog input)

Battery voltage detection (analog input)

Analog standard voltage input terminal

A/D converter analog power terminal

Reset input

Clock oscillation terminal (32.768 kHz)

Clock oscillation terminal

Flash memory writing voltage

Main clock oscillation terminal (4MHz)

Main clock oscillation terminal

GND

Battery OFF detection

Serial communication requirement (from ASIC)

Key scan input 6

-

-

Compulsion boot control

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