Block Diagram; Printed Circuit Board - NDD EasyOne-CS Field Service Manual

2030434-006 Rev. E

5.3 Block Diagram

The following picture shows the functional block diagram of the EasyOne-CS Spirometer.
Flow Sensor
ASIC
Buzzer
Graphic LC
Display
Keypad
ON/OFF

5.4 Printed Circuit board

All electrical components of EasyOne-CS are mounted on a single PCB.
With the exception of the lithium battery no components can be serviced.
The following two pictures show a top and bottom view of the PCB.
The lithium battery located on the top right of the PCB has an approximate life time of 5 to 10 years. In
early revisions of the hardware the lithium battery is soldered on the board.
EasyOne-CS Field Service Manual
Microcontroller
M16C62
Power
Management
Figure 7: Bottom view of EasyOne-CS PCB
Real Time
Clock (RTC)
Serial Data
Flash
Screen
Connector
EZ1-BlockDiagram.sdr
Page 6
PC (USB)