Nellcor OxiMax N 5500 Service Manual page 90

Unit Description
l Power unit : consists of power entry module, SMPS, battery charger, battery, external
DC input and DC/DC unit.
Power Entry
l Processor unit : consists of Samsung S3C44B0X CPU, SDRSM, Boot ROM and
Flash.
Boot
Memory
Selection
Signal
l User-control unit : consists of 1 power on/off switch, 4 functional switch, optical
encoder, power on indicator LED, AC power indicator LED and low battery indicator
LED.
DC
Entry
Con
AC 100-250V
50Hz/60Hz
SMPS
Module
Figure 12. Power Unit Block Diagram
Data
SDRAM
Source Program /
FLASH
Trend,Setup data
Source Program
Boot ROM
Boot Memory Selector
Selection Switch
Figure 13. Process Unit Block Diagram
Buttons
Optical Encoder
with
Push Button
Figure 14. User-Control Unit Block Diagram
N5500 Service Manual
System Processing Description
DC 10 - 16V
SMPS OUTPUT Status
Input
Selection
DC 12 - 16.8V
NI-MH
Battery Charger
Watch Dog
S3C44B0X
SDRAM
TO S3C44B0X (Processor Unit) General
Purpose Port
TO S3C44B0X (Processor Unit) External
Interrut
DC10 - 19V
SpO2 Unit
UART
IOP Unit
Coin Cell Battery Power
RTC
Timer
Control Signal
GPIO
Status Input
83