Siemens Pacemaker UM344-2 Manual de usuario Pagina 135

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CIRCUIT DESCRIPTION UM344-2
September 1995
7
-
2
FIGURE 7-1 Model 344 Electronics Module Block Diagram
RTDI+
104 uA
Source
TC+
RTD
TC
TC-/RTD-
Upscale/
Downscale
Burnout
Trickle Current
P-Channel
FET Switch
V Burnout
52 uA Sink
CMOS
Analog
Switch
RTD SEL
2-Pole Filter
AMP Input 1
Reference
Junction
Temperature
Sensor
AMP
Input 2
A to D
Converter
Control
SCLK
Data
Data/Control
Isolation
Isolated
Power Supply
12-42 Vdc Loop Power Supply Input
SIGNAL+
Loop
SIGNAL-
V to I
Converter
Analog
Meter,
Earlier
XTCs
Only
Pulse On
Pulse Off
HART Signal
2-Pole
Active Filter
Zero Crossing
Detector
ASIC
D to A
Converter
REC
HART
Modem
Digital Signal
Pushbuttons
Zero
Full Scale
Microcontoller
(uC)
UART
Digital
Meter
X02829S1
XMIT (T )
XA
(R )
XA
R
XD
T
XD
Output Circuitry
Input Circuitry
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