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參數(shù)資料
| 型號： | ICL8212 |
| 廠商： | Intersil Corporation |
| 英文描述： | Programmable Voltage Detectors |
| 中文描述： | 可編程電壓檢測器 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 153K |
| 代理商： | ICL8212 |
7-174
ICL8211, ICL8212
SPST switches range from push button and slide types to cal-
culator keyboards. A major problem with the use of switches is
the mechanical bounce of the electrical contacts on closure.
Contact bounce times can range from a fraction of a millisec-
ond to several tens of milliseconds depending upon the switch
type. During this contact bounce time the switch may make and
break contact several times. The circuit shown in Figure 37 pro-
vides a rapid charge up of C
1
to close to the positive supply
voltage (V
1
) on a switch closure and a corresponding slow dis-
charge of C
1
on a switch break. By proportioning the time con-
stant of R
1
C
1
to approximately the manufacturer’s bounce time
the output as terminal #4 of the ICL8211/8212 will be a single
transition of state per desired switch closure
Low Voltage Power Disconnect (Figure 38)
There are some classes of circuits that require the power
supply to be disconnected if the power supply voltage falls
below a certain value. As an example, the National LM199
precision reference has an on chip heater which malfunc-
tions with supply voltages below 9V causing an excessive
device temperature. The ICL8212 may be used to detect a
power supply voltage of 9V and turn the power supply off to
the LM199 heater section below that voltage.
For further applications, see AN027 “Power Supply Design
using the ICL8211 and ICL8212.”
FIGURE 36. FREQUENCY LIMIT DETECTOR
FIGURE 37. SWITCH BOUNCE FILTER
FIGURE 38. LOW VOLTAGE POWER SUPPLY DISCONNECT
1
2
3
4
8
7
6
5
R
1
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
OUTPUT
R
6
ICL8211
OR
ICL8212
#3
B
R
7
R
5
A
R
2
R
3
C
2
C
3
C
1
INPUT
R
6
V+
R
4
ON TIME #2
INPUT
1.15V
A
1.15V
B
INDETERMINATE
BELOW F
O
OFF
ON
FREQUENCY
F
O
ON
OFF
O
I
O
I
TIME CONSTANT R
3
C
2
< R
4
C
2
≤
R
7
C
3
VARY R
1
FOR OPTION ZERO CROSSING DETECTION
VARY R
4
TO SET DETECTION FREQUENCY
ICL8212
ICL8212
1
2
3
4
8
7
6
5
V+
R
3
R
2
V
O
R
1
C
1
R
4
100
R
L
ICL8211
OR
ICL8212
1
2
3
4
8
7
6
5
V-
500k
56k
OUTPUT
REFERENCE
LM199
4.7k
3.9k
ICL8212
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL8212/D WAF | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA DIE | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA WAF | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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