Sanyo VPC-CS1 Service Manual page 7

6. Receiving user operations showing that the camera has been turned on
When the battery is installed, the 3.2V power supply which is output from IC501 is constantly being input to the power sequencer
of the ASIC, and it monitors user operations that generate a P-ON request (such as POWER key input and panel opening).
7. Power control
When a power on request is generated by the user, the PON signal is set to High and the DC/DC converter turns on. In addition,
the resetting of the CPU inside the ASIC is canceled. This causes all blocks and memories other than the power sequencer of the
ASIC to start operating.
ON/OFF control for the 1.8V, 2.8V and 3.3V power supplies for the CMOS sensor is carried out by the ASIC setting PAON1 and
PAON2 to High or Low, and also by I2C signal sent to IC501.
Shooting mode
8. Clock backup
The clock backup is carried out by IC501.
The ASIC gets clock information via I2C when necessary.
9. Light emission control circuit
When the LIGHT_ON signal from the ASIC is High, it turns Q6101 on and the LED illuminates.
9-1. Light emission for still picture shooting
If the menu settings for the camera unit are used to set the LED light to 'AUTO' or 'FORCED', the LED illuminates.
(Note) For AUTO, the LED will illuminate according to the ambient brightness. The LED will illuminate when the shutter button is
pressed to the first step and shooting will stop, and when S2 is pressed, the LED will stay illuminated until shooting is complete.
9-2. Light emission for moving picture shooting
If the menu settings for the camera unit are used to set the LED light to 'AUTO' or 'FORCED', the LED illuminates.
(Note) For AUTO, the LED will illuminate according to the ambient brightness. The LED will illuminate during shooting of moving
pictures.
Power OFF
Play mode
Table 2-2. Power Control
ASIC/memory/LCD
1.1V, 1.8V, 3.3V 1.8V, 2.8V, 3.3V
OFF
ON
ON
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CMOS
OFF
ON
OFF