GE TruSat - 2 Theory of Operations; Functional Block Diagram

2–1
2. THEORY OF OPERATIONS
This chapter contains:
• Functional block diagram.
• SpO
2
, pulse rate, and PI
r
measurement principles.
• Functional descriptions of the power supply, System board, Display board, and
the Trend Download board (RS-232).
2.1 Functional block diagram
A/D
converter
Data & Clocks
Sensor
Digital
isolators
Isolated
power supply
Data & status info
DSP
VDD
LED timing
Code & data
memory
Voltage
regulators
Battery charger
Clock
Display board connector
ComWheel
Backlight
4.2 V regulator
LCD
AC & alarm LEDs
V-CORE
regulator
Backlight
supply
Watchdog
micro
Keys
Display control
Microprocessor
Speaker
driver
LED drive
Analog
front end
AUX A/D
converter
CPLD
Line power supply
ON/OFF &
alarm switches
Display
drivers
Trend Download
board
Alarm
Figure 2-1. Functional block diagram