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參數(shù)資料
| 型號(hào)： | L6372 |
| 英文描述： | OCTAL INDUSTRIAL INPUT INTERFACE(253.91 k) |
| 中文描述： | 八路工業(yè)輸入接口（253.91十一） |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 253K |
| 代理商： | L6372 |
If not even the low level current I
1
can be sunk,
then the signal is interpreted as ” input discon-
nected ”. Around I
1
the input characteristic is a
constant current line, and the voltage varies rap-
idly.
A voltage comparator is sensing the input, and is
triggered at levels of V
1l
(typically 0.7V) and V
1h
(typically 0.9V). The distance between the two
thresholds (hysteresis) is provided to give immu-
nity against the noise that may affect the input
signal.
If an intermediate level is detected, sinking a cur-
rent between I
1
and I
2
, the signal is interpreted as
”line connected,with a low level signal received”.
Again, an internal voltage
with two thresholds separated by an hysteresis
for noise immunity (V
2l
, typically 2V and V
2h
, typi-
cally 2.2V). If a level clearly corresponding to the
current I
2
is detected, then the signal is
preted as ” line connected, with a high level sig-
nal received ”.
comparator is used,
inter-
DATA/DIAGNOSTIC
The signal on pin 12, Dt/Dg, decides whetherthe
information on the signals level or the information
on the status of the lines is transferred to the digi-
tal section of the device.
A high level on this pin means that Data are to be
transferred to the inputs of the digital filters; a low
level means that the Diagnostics are requested
instead.
Table 1:
Dt/Dg selection: input to the digital filter
INPUT CURRENT
(Input Voltage Vi)
Between
Low and
High Level
(V
ih
<V
i
<V
2l
)
1
0
Below Low
Level
(V
i
< V
1l
)
Above High
Level
(V
2h
< V
i
)
Dt / Dg = 0
Dt / Dg = 1
At this point one digital filter on each of the eight
channels processes the information to suppress
the noise. The sampling frequency is externally
programmable with combination of the capacitor
C and the resistance R
ref
.
0
0
1
1
DIGITAL FILTERS
General Function
The digital filter, on each channel, filters out the
disturbancesof shortduration.
Before the signal enters the digital circuitry, a low
pass effect of approximately 1.5
μ
sec (low pass
below 700kHz) is found in the comparators that
perform the analog-to-digital conversionof the in-
put signals.
The signal (Data or Diagnosticaccording to the
choice made by the Dt/Dg input signal) is sam-
pled at a fixed frequency.
Such frequency is the frequency of the on-chip
oscillator (or of an externalsignal),divided by 8.
Figure4:
Input Characteristics at Low Levels
L6372
9/15
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