Circuit Board - GE TuffSat User's Manual And Service Manual

Circuit board

The circuit board contains all the circuitry for the TuffSat oximeter. The functions
performed by this board are illustrated below.
Power supply
Power on/off
control
(reset control)
Ambient light
detection
Code memory
and
Data memory
Watchdog
timer
Figure 1-4. Circuit board block diagram
Processor
Timing
Sensor LED
A/D converter
drive
Analog
Signal Path
Analog
Sensor
front end
Overview
Keys
Backlight LED
Alphanumeric
LCD and LCD
driver
Infrared (IR)
wireless
transmitter
1-5