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ICL7665S Datasheet(PDF) 11 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) 11 Page - Intersil Corporation

 
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11
FN3182.8
April 5, 2006
Simple High/Low Temperature Alarm
Figure 16 illustrates a simple high/low temperature alarm
which uses the ICL7665S with an NPN transistor. The
voltage at the top of R1 is determined by the VBE of the
transistor and the position of R1’s wiper arm. This voltage
has a negative temperature coefficient. R1 is adjusted so
that VSET2 equals 1.3V when the NPN transistor’s
temperature reaches the temperature selected for the high
temperature alarm. When this occurs, OUT2 goes low. R2 is
adjusted so that VSET1 equals 1.3V when the NPN
transistor’s temperature reaches the temperature selected
for the low temperature alarm. When the temperature drops
below this limit, OUT1 goes low.
AC Power Fail and Brownout Detector
Figure 17 shows a circuit that detects AC undervoltage by
monitoring the secondary side of the transformer. The
capacitor, C1, is charged through R1 when OUT1 is OFF.
With a normal 100 VAC input to the transformer, OUT1 will
discharge C1 once every cycle, approximately every 16.7ms.
When the AC input voltage is reduced, OUT1 will stay OFF,
so that C1 does not discharge. When the voltage on C1
reaches 1.3V, OUT2 turns OFF and the power fail warning
goes high. The time constant, R1C1, is chosen such that it
takes longer than 16.7ms to charge C1 1.3V.
HYST1
VSET1
VSET2
HYST2
V+
OUT1
OUT2
5.86k
130k
BACKUP
BATTERY
7805
5V REGULATOR
UNREGULATED
DC INPUT
1M
22M
2.2M
1M
715k
1M
RESET OR
WRITE
ENABLE
POWER
FAIL
WARNING
470
µF
4700
µF
ICL7665S
FIGURE 15. POWER FAIL WARNING AND POWERUP/POWERDOWN RESET
ICL7665S


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