Service manual

95
z User-control unit: consists of jog dial, 5 functional buttons, optical encoder, power
on indicator LED, Battery charging indicator LED and battery charging status indicator
LED.
Buttons
Optical Encoder
with
Push Button
S3C2440A(Processor Unit) general purpose port
S3C2440A(Processor Unit) external interrupt
Figure 31. User-Control Unit Block Diagram
z Sound unit: consists of S3C2440A, ARM CPU, 2-channel amplifiers and speaker.
CPU
S3C2440A
Audio Amplifier
IIC
Interface
Alarm sound
Pulse tone sound
PWM Signal
Figure 32. Sound Unit Block Diagram
z Communication unit : UART
S3C2440A
Internal
UART
Printer Unit
SpO2 Unit
ECG Unit
External
UART
TL16C554A
S3C2440A System
BUS
NIBP Unit
USB Device Unit
Temperature Unit
Sub CPU Unit
S3C2440A System
BUS
TCP/IP Unit
External
UART
TL16C554A
Figure 33. Communication Unit Block Diagram