GE Datex-Ohmeda Aisys Carestation Reference Manual page 55

Exp Data
Insp Data
2
E Clk
E 2 +5.0V
E 2 GND
Bag/Vent Sw
O2 Flush Sw
O2 Disconnect
ACGO/SCGO Sw
CGO Sw
ABS On Sw
Canister Release Sw
SCGO
GIV Drv GIV
Driver
Flow
Valve
Driver
O2 Sensor
Ventilator Interface Board
Figure 2-18 • Ventilator Interface board block diagram
M1046983 04/08
+12.5V Accessory Power
+12.5V Valve Power
+12.5V
2
I C MUX
to Flow Sensors
+5V
Reg.
Parallel I/O
SCGO SCGO On
Driver
GIV On
Over_Press
ISP
Header
DAC
12-Bit
ADC
12-Bit
8-Channel
Amp/Filter
Amp/Filter
Inspiratory
Transducer
+5.0VA
Filter
+5.0VDD
+6.0VA
-6.0VA
Emulator
Activity Indicators
Header
Reset, Watchdog,
RxD
ATMEGA16
Microcontroller
TxD
Reset
W_Dog
ADC
10-Bit
Local Power
Supply Monitors
SPI Addr
Decoder
FL DAC CS
FL DAC LD
ADC CS
VREF
Amp/Filter Amp/Filter Amp/Filter
Expiratory Manifold
Transducer Transducer Transducer
2 Theory of Operation
Local Power
+12.5V
Supply
Regulators
Txd & Rxd
RS-422
Transceiver
Watchdog and
Under-Voltage
Monitor
VDD Over-
Voltage Monitor
+12.5V
Over_Press
Comp
Airway_Press
Manifold_Press
Inspiratory_Press
Expiratory_Press
Airway
2-23