Rainbow Electronics ICL7665 - Manual (Page 11)

ICL7665
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
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HYST1
SET1
GND OUT2
SET2
HYST2
OUT1 V+
ICL7665
100k
2N4393
1M
LINE-POWERED
+5V INPUT
Q1
1k
1 µ F
5.6M
1M
2.4M
220 Ω
2N7000
22M
1M
1%
1.15M
1%
3V
LITHIUM
CELL
VCC TO
CMOS
MEMORY
Figure 11. Battery Switchover Circuit
Figure 12. Simple High/Low Temperature Alarm
HYST1
SET1
OUT2 OUT1
SET2
HYST2
V+
ICL7665
R4
22M
R5
27k
R6
22M
R1, 1M
HIGH-
TEMPERATURE
LIMIT
ADJUSTMENT
ALARM
SIGNAL FOR
DRIVING LEDS,
BELLS, ETC.
TEMPERATURE
SENSOR
(GENERAL
PURPOSE NPN
TRANSISTOR)
R7
1.5M
R2
1M
LOW-TEMPERATURE
LIMIT ADJUST
9V
R3
470k