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Analog
Reference
Voltage
Serial
Interface
SpO2
Patient
Analog
Sensor
Section
AD Bus
Enables
Output
Port
Battery
Type
Real Time
Lithium
Clock and
Battery
Non-Volatile
Memory
External to Board
BUSSES
SIGNALS
Figure 9-3: N-20PA Hardware Block Diagram
Ambient
Light
CPU
Control
Analog
Control
AD Bus
Address
Address
Demultiplexing
Decoding
Input
CPU
Port
Memory
Input Port
Output Port
Audio
Display
Output
Control
Display
Technical Supplement
Battery
Ambient
Voltage
Temperature
Analog
Battery
Power
Power
Power
Off
Control
Power
Control
Power
Supply
Standard
User
Supply
Digital I/O
Digital I/O
Printer
Interface
User
Controls
User
Optional Printer
Flex Circuit with
User Controls
9-3
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