Download: 1-4. CP1 STROBO CIRCUIT DESCRIPTION

1-4. CP1 STROBO CIRCUIT DESCRIPTION 1. Charging Circuit 2. Light Emission Circuit When UNREG power is supplied to the charge circuit and the When RDY and TRIG signals are input from the ASIC, the CHG signal becomes High (3.3 V), the charging circuit starts stroboscope emits light. operating and the main electorolytic capacitor is charged with high-voltage direct current. 2-1. Emission control circuit However, when the CHG signal is Low (0 V), the charging When the RDY signal is input to the emission control circuit, circuit does not operate. Q5409 switches on and preparation is made to let cur...
Author: Sean Shared: 8/19/19
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1-4. CP1 STROBO CIRCUIT DESCRIPTION 1. Charging Circuit 2. Light Emission Circuit When UNREG power is supplied to the charge circuit and the When RDY and TRIG signals are input from the ASIC, the CHG signal becomes High (3.3 V), the charging circuit starts stroboscope emits light. operating and the main electorolytic capacitor is charged with high-voltage direct current. 2-1. Emission control circuit However, when the CHG signal is Low (0 V), the charging When the RDY signal is input to the emission control circuit, circuit does not operate. Q5409 switches on and preparation is made to let current flow to the light emitting element. Moreover, when a STOP 1-1. Power switch signal is input, the stroboscope stops emitting light. When the CHG signal switches to Hi, Q5406 turns ON and the charging circuit starts operating. 2-2. Trigger circuit When a TRIG signal is input to the trigger circuit, D5405 1-2. Power supply filter switches on, a high-voltage pulse of several kilovolts is gen- L5401 and C5405 constitute the power supply filter. They erated inside the trigger circuit, and this pulse is then applied smooth out ripples in the current which accompany the switch- to the light emitting part. ing of the oscillation transformer. 2-3. Light emitting element 1-3. Oscillation circuit When the high-voltage pulse form the trigger circuit is ap- This circuit generates an AC voltage (pulse) in order to in- plied to the light emitting part, currnet flows to the light emit- crease the UNREG power supply voltage when drops in cur- ting element and light is emitted. rent occur. This circuit generates a drive pulse with a frequency of approximately 50-100 kHz. Because self-excited light omis- Beware of electric shocks. sion is used, the oscillation frequency changes according to the drive conditions. 1-4. Oscillation transformer The low-voltage alternating current which is generated by the oscillation control circuit is converted to a high-voltage alter- nating 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 high- voltage direct current and is accumulated at electrolytic ca- pacitor C5412 on the main circuit board. 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 and R5419, it is output to the SY-A block as the monitoring voltage VMONIT. When this VMONIT voltage reaches a specified level at the SY-A block, the CHG signal is switched to Low and charging is interrupted. – 7 –, 1-5. SY-A CIRCUIT DESCRIPTION 1. Configuration and Functions For the overall configuration of the SY-A block, refer to the block diagram. The SY-A 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, 3. Power ON/OFF, 4. Strobe charge control. Pin Signal I/O Outline 1~2 NOT USED - - 3 AVSS - GND 4 AVR - Analog power 5 AVCC - Analog power 6 VDD3 I Main (ASIC system) power detection 7 UNREG (S) I Battery power input (analog input) 8 VDD3 I Main (ASIC system) power detection 9 STROBO_V I Strobo charge voltage input (analog input) 10~12 P54~P56 I Connect to GND through register 13 VSS - GND 14 DC_IN I AC adaptor connection detection (analog input) 15~16 X1, X0 - Main clock oscillation terminal (4 MHz) 17~18 MOD1, 0 I Connect to GND 19 P. ST. I Reset input 20~23 S10~S13 I Key matrix input 24 P04 I Connect to GND through register 25~26 P05~P06 I Connect to GND through register 27 PLL_EN O ASIC PLL permission signal 28 USB_CNT I USB connection detection H : Connection 29 REQACK I Serial communication control signal 30 SDIR O Serial communication control signal 31 BAT_OFF I Battery OFF detection H : OFF 32 +3.2_SW O 3.2 V power (switch) 33 RESETBOReset output to ASIC L : Reset 34 P ON O DC/DC converter (analog) ON/OFF signal H : ON 35~36 NOT USED - - 37 VF_LED_G O VF LED (green) ON/OFF signal L : Light 38 EXT_IRQ1 O External interruption signal 39~40 SDATA I/O Serial communication control signal 41 SCLK O Serial communication control signal 42 SELF_LED_R O Self LED (red) ON/OFF signal L : Light 43 NOT USED - - 44~45 X0A, X1A - Sub clock oscillation terminal (32.768 kHz) 46 BUZZER O Buzzer output terminal 47 CHARGE O Strobo charge ON/OFF signal L : ON 48~52 NOT USED - - 53 VCC - Digital power 54~74 NOT USED - - 75~78 SO0~SO3 O Key matrix output 79~80 NOT USED - - Table 4-1. 8-bit Microprocessor Port Specification – 8 –, 2. Internal Communication Bus The SY-A block carries out overall control of camera operation by detecting the input from the keyboard and the condition of the camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data to the camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 4-1 shows the internal communication between the 8-bit microprocessor, ASIC and SPARC lite circuits. RESET B

REQACK

8-bit SDATA ASIC Microprocessor

SDIR SCK

EXT_IRQ1 Fig. 4-1 Internal Bus Communication System 3. Key Operaiton For details of the key operation, refer to the instruction manual.

SCAN

SCAN IN0123

OUT

0 CF_IN TEST SHUTTER 2nd SHUTTER 1st 1 MAIN SW-PLAY POSITION MAIN SW-LCD OFF MAIN SW-LCD ON COVER SW POSITION POSITION 2 DOWN RIGHT LEFT UP 3 - SET MODE FOCUS SW Table 4-2. Key Operation – 9 –, 4. Power Supply Control The 8-bit microprocessor controls the power supply for the overall system. The following is a description of how the power supply is turned on and off. When the battery is attached, a regulated 3.2 V voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and key scanning is carried out even when the power switch is turned off, so that the camera can start up again. When the battery is removed, the 8-bit micro- processor operates in sleep mode using the backup capacitor. At this time, the 8-bit microprocessor only carries out clock counting, and waits in standby for the battery to be attached again. When a switch is operated, the 8-bit microprocessor supplies power to the system as required. The 8-bit microprocessor first sets the P ON signal at pin (34) to high, and then turns on the DC/DC converter for the digital system. After this, it sets RESET B signal at pin (33) to high so that the ASIC is set to the active condition. After this, in case of driving the CCD, it sets the P (A) ON signal at pin (176) of the ASIC to high, and then turns on the DC/DC converter for the analog system. If the LCD monitor is on, the LCD ON signal at pin (175) of the ASIC set to high, and the DC/DC converter for the LCD monitor is turned on. Once it is completed, the ASIC returns to the reset condition, all DC/DC converters are turned off and the power supply to the whole system is halted. ASIC, 8 bit LCD

CCD

memory CPU MONITOR5V(A) 3.2 V Power voltage 3.3 V +12 V etc. +12 V etc. (ALWAYS) Power OFF OFF OFF 32KHz OFF Power switch ON- OFF OFF 4 MHz OFF Auto power OFF Shutter switch ON ON ON→OFF 4 MHz OFF

CAMERA

Resolution, flash, self-timer switch ON OFF OFF 4 MHz OFF LCD finder ON ON 4 MHz ON Play back ON OFF 4 MHz ON Table 4-3. Camera Mode Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation – 10 –]
15

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