GE Medical Systems
EAGLE 1000
Page 49
Information Technologies
Servicing Instructions
227 468 01 Rev. G
ADC operation
The ADC receives all the information and transfers the parameter readings via a
bidirectional serial interface. Although this provides a clock to operate the interface func-
tions, it does not provide the clock for conversion. This is obtained as a local asyn-
chronous signal from a 4MHz oscillator, whose output is divided into two times 2 MHz.
TEMP amplifier
An integrated precision instrument amplifier acts as an amplifier for the temperature sig-
nal, which alternately receives the measurement signal from the temperature half-
bridge, two control values and a reference value for offset correction from the precision
resistor network via a multiplexer. The multiplexer is controlled along with the ADC of the
serial interface by a PAL.
2.2.11.3 Internal interfaces
Mechanical interfaces
The PCB PRESS-TEMP is plugged into the PCB ECG Monitor mechanically. The floating
power supply, i.e., the oscillator connections and the QSPI signal paths to the processor
are via this plug-through connector. This is located at the middle of the floating section of
the PCB.
Electronic interfaces
Internal communication is mediated by a QSPI interface.
JJ/1
SCLK
Serial clock
JJ/2
MOSI
Master Out Slave In signal
JJ/3
PCS2_
Chip select PRESS
JJ/4
PCS3_
Chip select TEMP
JJ/5
MISO
Master In Slave Out signal
JJ/6
-
JJ/7
+5 V
JJ/8
GND
JJ/9
+12 VH
Transformer power supply
JJ/10 SR_VSW
Transformer power switch
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