System Overview
2-19
Optical coupling
- Optical coupling circuit is responsible for changing voltage level and isolating the ground of circuit at
each sides of optical coupler.
DAC
- DAC (Digital Analog Converter) circuit is responsible for output analog signal, such as KV setting, mA
setting and mA pre-heat.
VFC
- VFC (Voltage Frequency Converter) circuit is responsible for converting mA signal to frequency value
in order to implement mAs function.
Communication
- RS422 protocol is used for MCU to communicate with workstation or DAP.
- SPI protocol is used for MCU to communicate with Control Panel.
Indication
- Indication circuit includes LED and buzzer, which are controlled by MCU and peripheral controller.
Miscellaneous hardware
- Other circuits include power supply, supervisor circuit, watchdog circuit, clock generator, and security
control, etc.
Power Distribution
Power Supply Overview
The power of MCB is drove by power supply 1 & 2 via mother board, and +3.3V, +2.5V & +1.2V are generated
from +5V_PS1. Power supplies are listed as follows.
Reference of -15V_PS1 & +15V_PS1
Grounding Connection
All the grounds of power are connected by mother board with one point strategy.
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