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H Reset
J] Reset
Measure
A
OAT
55
RESET
READY
I
H E LT 37
BY
\
Data
SA bits
-¥~
A
T
Five important pins on the pC IC109
R128
IK
SMH
e
R129
i
ms
~ic no
'
O
1000 ms
ZOOms
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I)
V -
57*
57"
55 "
57"
P25
26
75
-I Ready
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-
icfo«l.cro9
RESET
Tt
IO
11
13
1L
DBt.
08$
oo 6
1S
Ulpia
—
to
IC 109
60L8/
R 6668
------- c 5
~V-
A
— "A
GR106
BAV10
27
__ 28
__ 29
30
' 6
___ 17
EO
XTAL 1
—
T
XTAL2
R
wo
1000
lOCOOf
20000J"
CT. 100
CT.
1000
cT.ioooo
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t
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oooo
The time interval between MEASURE goes high and
READY goes low is depending on the frequency of the
input signal. Maximum is 1.2s.
If there is no input signal or the frequency is too low,
MEASURE will be low for 270ms.
A new
The time interval between MEASURE goes low and
READY goes high is depending on the input frequency.
The lower limit is 1 to 2 periods of the input signal.
The upper limit is 270ms.
I ' 5
20
21
23
22
2C
d)
XTAL 1
INT
77
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