Measurement Computing PCI-DAS-TC - Manual (Page 12)

12
Chapter 3
Functional Details
PCI-DAS-TC Block diagram
PCI-DAS-TC functions are illustrated in the block diagram shown here.
Dual Port
SRAM
AM188
CPU
Control
Logic
Control
Registers
Flash
EPROM
Local BUS - Address, Data, Control
Programmable
Logic
Data
D0:7
Board
Select
Processing and Control Section
Oscillator
System +5
Isolation
Barrier
DC/DC
Converter
SELECT:
CJC
Gain
Channel
Calibration
Fout CLK
IN
V/F
Converter
+10V Ref
Gain
Mux
Input AMP
20
Channel
Mux
37
Pin
+10V
Prec.
Ref
+5V ISO
+15V ISO
-15V ISO
Input
Connector
+9.9V
CJC
AGND
TC Input
Channels
0 - 15
Screw
Terminal
CJC
Open
Thermocouple
Detection
Switches
0
15
External
DAS-TC
Screw Terminal
(For CJC) +15ISO
Thermocouple
Input
Channels
Isolated Analog Input Section
32-BIT, 33 MHz, 5V PCI BUS
PLX9050
PCI Interface
Control
Signals
Local
Control
Address
Data Bus
Transceiver
SRAM
Optical
Isolator
Optical
Isolator
Optical
Isolator
Optical
Isolator
Figure 3. PCI-DAS-TC functional block diagram