4535 611 98931 iE33 Service Manual Page 82
CSIP Level 1 Theory of Operation: Physical Structure
• Keyboard illumination LEDs
• Piezoelectric beeper
• Detects user inputs, communicates with the system CPU via a USB port, and displays out-
puts
• Provides a 7-port USB hub
• Analog to digital conversion of the TGC/LGC signals.
• 24-MHz clock provides reference frequency for a clock synthesizer that drives various fre-
quencies to the clocked devices within the control panel (microcontroller, USB hub, and so
on).
• CPM provides power and signal interface to CPUI.
• Host Motherboard USB routes directly to CPM for expanding to seven-port USB hub.
• Uses +5 Vdc from the Platform Power Supply.
• Identifies revision levels of CPM and CPUI modules.
Control Panel Connector Board Interface (2 Boards)
• Provides LVDS (low-voltage differential signaling) from the AVIO to the LCD display
• Connects the CPM to the Backlight Inverter
• Provides an interface for a potentiometer controlling the Backlight Inverter (CCFL or
cold-cathode fluorescent lamp)
• Provides interface to Backlight Pot
• Provides an interface from the CPM to the beeper
• Provides interface to the QWERTY control panel LEDs
• Connects touch screen sense lines to the CPM
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