− 10 −
SPARC
Lite
ASIC,
memory
RS232C
driver
CCD
4bit
CPU
MODE
LCD
LCD
MONITOR
Power voltage
Power switch OFF
Power switch ON-
Auto power down
Shutter switch ON
Resolution, Flash,
Self timer switch ON
LCD finder
3.3 V
3.3 V
5 V
3.2 V (A)
+12 V -9 V
3.2 V
(ALWAYS)
3.2 V
(ALWAYS)
5V (L)
+12V etc.
OFF
OFF
OFF
OFF
32KHz
OFF
OFF
ON
ON
ON
OFF
1MHz
ON
ON
OFF
OFF
OFF
OFF
1MHz
ON
OFF
ON
ON
ON
ON
→
OFF
1MHz
ON
OFF
OFF
OFF
OFF
OFF
1MHz
ON
OFF
ON
ON
ON
ON
1MHz
ON
ON
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Table 4-3. Camera Mode (Battery Operation)
SPARC
Lite
ASIC,
memory
RS232C
Driver
CCD
4bit
CPU
MODE
LCD
LCD
MONITOR
Power voltage
Power switch OFF
Continuous image
Power switch ON-
Auto power down
Take a picture
Erase image
Download image
3.3 V
3.3 V
5 V
5 V (A)
+12 V -9 V
3.2 V
(ALWAYS)
3.2 V
(ALWAYS)
5 V (L)
+12V etc.
OFF
OFF
OFF
OFF
32 KHz
OFF
OFF
OFF
OFF
OFF
OFF
1 MHz
ON
OFF
ON
ON
ON
ON
→
OFF
1 MHz
ON
OFF
ON
ON
ON
OFF
1 MHz
ON
OFF
ON
ON
ON
OFF
1 MHz
ON
OFF
ON
ON
ON
ON
1 MHz
ON
OFF
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Table 4-4. Host Mode (Battery Operation)
Message from host
ON
ON
ON
ON
1 MHz
ON
OFF
Note) P. SAVE = Power save mode, 1 MHz = Main clock operation, 32 kHz = Sub clock operation
4. Power Supply Control
The 4-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 4-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 4-bit micro-
processor operates in sleep mode using the backup capacitor (C3050). At this time, the 4-bit microprocessor only carries out
clock counting, and waits in standby for the battery to be attached again. When a switch is operated, the 4-bit microprocessor
supplies power to the system as required.
The 4-bit microprocessor first sets both the P (A) ON signal at pin (3) and the P ON signal at pin (4) to low, and then turns on the
DC/DC converter. After this, High signals are output from pins (7) and (8) so that the ASIC and the SPARC lite are set to the
active condition. If the LCD monitor is on, the LCD ON 1 signal at pin (12) and the LCD ON 2 signal at pin (2) set to Low, and the
DC/DC converter for the LCD monitor is turned on. Once SPARC lite processing is completed, the ASIC and the SPARC lite
return to the reset condition, all DC/DC converters are turned off and the power supply to the whole system is halted.
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