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FIGURE 1-36
INDEX GENERATION
RESET
ONE
SHOT
RESET
TO
I--.:..;.:;.;;;..:;..;........;:~
MICROPROCESSOR
TP7
ONCE AROUND
fiO)NNiCC EE
,--2.
0 tiJN
LJ.Y4_~
+U S E R
AROUND
INDEX
NO ONCE
SEPAR-
AROUND
ljA~T:QOJiR.J----:~~~
- INDEX
The circuit for the index comparator is shown in Figure 1-37. R72 and C38 make a low pass filter to eliminate
high frequency noise. R74 and R75 provide hysteresis according to V
4
(R74
) - V
INDEX
TRANSDUCER
2
3
-
-
R72
1 K
- -
+5V
LM311
-sv
R74
510
R75
7K
7
FIGURE 1-37
INDEX COMPARATOR
1-33
R74 +R75 -
3·
+sv
RAW
INDEX
R73
S.lK
TO RESET
&
TO USER
INDEX SEPARATOR
REV A (01/84)
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