Product Principle 4-9
4.7 Control Panel
Control panel unit includes two boards, as shown below:
No. Board
Name
Description on Board Function
1 Control
Panel
LCD monitor folding/unfolding detection, power button, trackball, standard
keys on keyboard, user-defined functional keys, backlight control, status
indicator of the device, encoder, buzzer, TCG detection, etc.
2 TGC
Board
TCG adjustments in 8 segments
Control Panel
Main Board
System status
indicator
Power button
TGC Board
Function
button
Button
scan
LED
backlight
drive circuit
LED backlight
Buzzer
Buzzer drive
circuit
PWM generation
circuit
FPGA
12
V
、
5V、
5V
_STB
MCU
SPI
Communication&control
Power supply
QWERTY
keyboard
L
T
B
C
Encoder
Button
Encoder
info
process
Rotate
Trackball
module
USB
USB
Right
button
of
trackball
Left
button
of
trackball
ADC
circuit
Screen closed m agnetic
detection sw itch
The functional diagram of the control panel unit is shown above. The main functions are described
in details.
1. FPGA module adopts FPGA and implements key scan detection, backlight control, encoder
detection, buzzer control and other functions.
2. MCU module implements USB communication, TGC detection, etc. FPGA and PSOC
communicate via SPI port: PSOC obtains detection result of FPGA via SPI port and sends the
result to the host by USB. PSOC obtains control information from the host via USB and sends it
to FPGA via SPI port. FPGA performs the control operations to corresponding units after
parsing control orders.
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