4-16 Product Principle
5 status
indicators
TGC board
Digital key
board
Function
key
Encoder
board
Key
scan
LED constant-
current source
drive ciruit
Key backlight
LED
USB
port
chip
ADC
circuit
Buzzer
Buzzer drive
circuit
Main controller
TGC
scan
PWM generating
circuit
FPGA
Keyboard
Back-end motherboard
USB1
+12V,+5V
USB
HUB
interface
Trackball
key board
USB
connecting
board
trackball
Touch
screen key
board
USB2
Fig 4-19 Schematic diagram of control panel
4.5 ECG&PCG Unit
ECG&PCG unit, which mainly consists of ECG&PCG board, takes charge of ECG signal detection,
PCG signal monitor. After amplification, filtering, sampling and R-wave detection, the ECG/PCG
signal will be sent to DSP board. The detected ECG triggering signal will be sent to the uploading
logic on the DSP board through serial port, and then the signals will be sent to CPU module with
other image data.
The system can be connected with ECG leads and PCG transducer; the ECG leads are compatible
with the port on the patient monitor device of Mindray. Besides, USB extend board is adopted in the
ECG&PCG unit. USB signal from the digital board will be sent to USB extending board through
cables. For the user’s convenient, two USB ports are designed on the USB extending board.
Structure of ECG&PCG unit is described as below:
Comm
unicati
on
mother
board
Back-
end
mother
board
ECG leads
DC IN
PCG
transducer
Amplify
Filter
Sampling
R-
wave
detecti
on
CPU
module
ECG&PCG board
Digital board
Back-end
power board
+12V
USB extending
board
DSP
board
Serial
port
PCIE
Amplify
Filter
Sampling
Fig 4-20 Schematic diagram of ECG&PCG unit
4.6 Main Monitor Unit
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