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ICL7665S Datasheet(PDF) 9 Page - Intersil Corporation

Part No. ICL7665S
Description  CMOS Micropower Over/Under Voltage Detector
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ICL7665S Datasheet(HTML) 9 Page - Intersil Corporation

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9
FN3182.8
April 5, 2006
Applications
Single Supply Fault Monitor
Figure 12 shows an over/under voltage fault monitor for a
single supply. The overvoltage trip point is centered around
5.5V and the undervoltage trip point is centered around 4.5V.
Both have some hysteresis to prevent erratic output ON and
OFF conditions. The two outputs are connected in a wired
OR configuration with a pullup resistor to generate a power
OK signal.
Multiple Supply Fault Monitor
The ICL7665S can simultaneously monitor several supplies
when connected as shown in Figure 13. The resistors are
chosen such that the sum of the currents through R21A,
R21B, and R31 is equal to the current through R11 when the
two input voltage are at the desired low voltage detection
point. The current through R11 at this point is equal to
1.3V/R11. The voltage at the VSET input depends on the
voltage of both supplies being monitored. The trip voltage of
one supply while the other supply is at the nominal voltage
will be different that the trip voltage when both supplies are
below their nominal voltages.
The other side of the ICL7665S can be used to detect the
absence of negative supplies. The trip points for OUT1
depend on both the negative supply voltages and the actual
voltage of the +5V supply.
TABLE 1. SET-POINT EQUATIONS
NO HYSTERESIS
Overvoltage VTRIP =
R11 + R21
R11
x VSET1
Overvoltage VTRIP =
R12 + R22
R12
x VSET2
HYSTERESIS PER FIGURE 10A
VU1 =
R11 + R21 + R31
R11
x VSET1
Overvoltage VTRIP
VL1 =
R11 + R21
R11
x VSET1
VU2 =
R12 + R22 + R32
R12
x VSET2
Undervoltage VTRIP
VL2 =
R12 + R22
R12
x VSET2
HYSTERESIS PER FIGURE 11
VU1 =
R11 + R21
R11
x VSET1
Overvoltage VTRIP
VL1 =
R11 +
R21R31
R21 + R31 x VSET1
R11
VU2 =
R12 + R22
R12
x VSET2
Overvoltage VTRIP
VL2 =
R12 +
R22R32
R22 + R32 x VSET2
R12
OUT1
SET1
SET2
OUT2
V+
R21
RP
VIN
RP
R22
R11
R12
HYST1
HYST2
R31
R32
FIGURE 11. AN ALTERNATIVE HYSTERESIS CIRCUIT
HYST1
VSET1
VSET2
HYST2
V+
OUT1
OUT2
324k
13M
5%
100k
249k
7.5M
5%
+5V SUPPLY
POWER
OK
100k
1M
V+
OPEN VOLTAGE
DETECTOR
VU = 5.55V
VL = 5.45V
OPEN VOLTAGE
DETECTOR
VU = 4.55V
VL = 4.45V
R22
R32
R31
R21
FIGURE 12. FAULT MONITOR FOR A SINGLE SUPPLY
ICL7665S


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