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參數(shù)資料
| 型號(hào)： | ICL8212 |
| 廠商： | Intersil Corporation |
| 英文描述： | Programmable Voltage Detectors |
| 中文描述： | 可編程電壓檢測(cè)器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 153K |
| 代理商： | ICL8212 |
7-172
ICL8211, ICL8212
have dropped to zero. Upon power up to the normal
operating voltage this record must have been retained and
easily interrogated. This could be important in the case of a
transient power failure due to a faulty component or
intermittent power supply, open circuit, etc., where direct
observation of the failure is difficult.
A simple circuit to record an out of range voltage excursion
may be constructed using an ICL8211, an ICL8212 plus a
few resistors. This circuit will operate to 30V without exceed-
ing the maximum ratings of the ICs. The two voltage limits
defining the in range supply voltage may be set to any value
between 2.0V and 30V.
The ICL8212 is used to detect a voltage, V
2
, which is the
upper voltage limit to the operating voltage range. The
ICL8211 detects the lower voltage limit of the operating
voltage range, V
1
. Hysteresis is used with the ICL8211 so
that the output can be stable in either state over the
operating voltage range V
1
to V
2
by making V
3
- the upper
trip point of the ICL8211 much higher in voltage than V
2
.
The output of the ICL8212 is used to force the output of the
ICL8211 into the ON state above V
2
. Thus there is no value
of the supply voltage that will result in the output of the
ICL8211 changing from the ON state to the OFF state. This
may be achieved only by shorting out R3 for values of supply
voltage between V
1
and V
2
.
Constant Current Sources (Figure 32)
The ICL8212 may be used as a constant current source of
value of approximately 25
μ
A by connecting the THRESH-
OLD terminal to GROUND. Similarly the ICL8211 will pro-
vide a 130
μ
A constant current source. The equivalent
parallel resistance is in the tens of megohms over the supply
voltage range of 2V to 30V. These constant current sources
may be used to provide basing for various circuitry including
differential amplifiers and comparators. See Typical Operat-
ing Characteristics for complete information.
Programmable Zener Voltage Reference (Figure 33)
The ICL8212 may be used to simulate a zener diode by
connecting the OUTPUT terminal to the V
Z
output and using
a resistor network connected to the THRESHOLD terminal
to program the zener voltage
V
ZENER
=
(R
1
+ R
2
)
R
1
x 1.l5V.
FIGURE 30. NON-VOLATILE POWER SUPPLY MALFUNCTION RECORDER
OUTPUT ICL8211
ICL8212 DISCONNECTED
OUTPUT ICL8212
OUTPUT ICL8211
AS PER FIGURE 7
FIGURE 31. OUTPUT STATES OF THE ICL8211 AND ICL8212 AS A FUNCTION OF THE SUPPLY VOLTAGE
1
2
3
4
8
7
6
5
R
5
R
4
ICL8212
1
2
3
4
8
7
6
5
ICL8211
OUTPUT
RESET
S
1
R
1
R
2
R
6
V+
R
3
V
1
V
3
OFF
ON
SUPPLY VOLTAGE
V
2
V
NOM
OFF
ON
V
2
V
NOM
SUPPLY VOLTAGE
OFF
ON
SUPPLY VOLTAGE
V
2
V
1
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