ICL7665SACPAZ Intersil, ICL7665SACPAZ Datasheet - Page 10

• Manufacturer Part Number: ICL7665SACPAZ
• Description: IC VOLT DETECTOR OVER/UND 8-DIP
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of ICL7665SACPAZ

• Number Of Voltages Monitored: 2
• Output: Open Drain or Open Collector
• Reset: Active High
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Reset Timeout: -

Combination Low Battery Warning and Low
Battery Disconnect
When using rechargeable batteries in a system, it is
important to keep the batteries from being over discharged.
The circuit shown in Figure 14 provides a low battery
warning and also disconnects the low battery from the rest of
the system to prevent damage to the battery. OUT1 is used
to shutdown the ICL7663S when the battery voltage drops to
the value where the load should be disconnected. As long as
+5V
+15V
1.02MΩ
274kΩ
R
R
21B
21A
+
-
FIGURE 13. MULTIPLE SUPPLY FAULT MONITOR
R
R
R
31
21
49.9kΩ
11
R
11
R
21
HYST1
V
OUT1
SET1
HYST1
SET1
OUT1
ICL7665S
10
HYST2
FIGURE 14. LOW BATTERY WARNING AND LOW BATTERY DISCONNECT
V
OUT2
GND
SET2
V+
V+
HYST2
SET2
OUT2
301
kΩ
MΩ
-5V
22
787
kΩ
100kΩ
+5V
-15V
LOW BATTERY SHUTDOWN
+5V
R
R
R
12
32
22
POWER
1MΩ
OK
ICL7665S
V+
1MΩ
V
drops below 1.3V, OUT1 goes high shutting off the
ICL7663S. OUT2 is used for low battery warning. When
V
warning is on. When V
and the low battery warning goes off. The trip voltage for low
battery warning can be set higher than the trip voltage for
shutdown to give advance low battery warning before the
battery is disconnected.
Power Fail Warning and Powerup/Powerdown
Reset
Figure 15 shows a power fail warning circuit with
powerup/powerdown reset. When the unregulated DC input
is above the trip point, OUT1 is low. When the DC input
drops below the trip point, OUT1 shuts OFF and the power
fail warning goes high. The voltage on the input of the 7805
will continue to provide 5V out at 1A until V
7.3V, this circuit will provide a certain amount of warning
before the 5V output begins to drop.
The ICL7665S OUT2 is used to prevent a microprocessor
from writing spurious data to a CMOS battery backup
memory by causing OUT2 to go low when the 7805 5V
output drops below the ICL7665S trip point.
SET1
SET2
1MΩ
is greater than 1.3V, OUT2 is high and the low battery
is greater than 1.3V, OUT1 is low, but when V
SHUTDOWN
V+
SET2
ICL7663S
OUT1
GND
drops below 1.3V, OUT2 is low
SENSE
OUT2
LOW BATTERY WARNING
V
SET
100Ω
IN
is less than
April 5, 2006
SET1
FN3182.8
+5V
1A