Canon 40D - EOS 40D DSLR Livre blanc - Page 20

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The major circuit boards are as follows:

• Main board (digital control circuit and camera control circuit)

• Bottom board (flash circuit and actuator drive circuit)

• Power circuit board

These boards efficiently integrate various control circuits. There are also 23 flexible

boards outfitted with the sensor, switches, and so forth.

The main board is a highly integrated, 10-layer unit containing the digital control circuit

and the camera control circuit. It includes the following:

• The image signal-processing circuit consisting of ICs such as the A/D IC that converts

the CMOS sensor output to a digital signal

• The TG (Timing Generator) that generates the CMOS sensor's drive pulse

• The digital image-processing circuit that has DIGIC III

• The memory circuit that has DDR-SDRAM as the buffer memory

• The TFT liquid-crystal control circuit

• The USB terminal

• The video OUT terminal

• The extension system terminal

• The Main CPU that controls various sensors and mechanical parts for camera operations,

viewfinder display, and drive control circuit

• EEPROM memory to store saved data such as adjustment data (AE, AF, etc.)

The bottom board is a highly integrated, 4-layer board containing:

• The flash circuit and actuator drive circuit

• The flash circuit which controls the built-in flash's recycling and firing and the external

Speedlite control circuit

• The 2-motor control circuit that drives the mirror and shutter-driving actuator

• The lens power supply control circuit

• The Self Cleaning Sensor Unit's actuator drive control circuit

Major Hard Boards

Main board

Bottom board

III. PERFORMANCE

Power supply board