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IMP802LEPA Datasheet(PDF) 7 Page - IMP, Inc

Part # IMP802LEPA
Description  關P POWER SUPPLY SUPERVISOR WITH BATTERY BACKUP SWITCH
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Manufacturer  IMP [IMP, Inc]
Direct Link  http://www.ds-imp.com.cn/index.asp
Logo IMP - IMP, Inc

IMP802LEPA Datasheet(HTML) 7 Page - IMP, Inc

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7
IMP690A
IMP690A , 692A
, 692A , 802L, 802M, 805L
, 802L, 802M, 805L
Application Information
Backup Power Sources - SuperCapTM
Capacitor storage, with very high values of capacitance, can be
used as a back-up power source instead of batteries. SuperCapTM
are capacitors with capacities in the fractional farad range. A 0.1
farad SuperCapTM would provide a useful backup power source.
Like the battery supply, it is important that the capacitor voltage
remain below the maximum voltages shown in Table 2. Although
the circuit of Figure 5 shows the most simple way to connect the
SuperCapTM, this circuit cannot insure that an overvoltage condi-
tion will not occur since the capacitor will ultimately charge up to
VCC. To insure that an overvoltage condition does not occur,
the circuit of Figure 6 is preferred. In this circuit configuration, the
diode-resistor pair clamps the capacitor voltage at one diode-
drop below VCC. VCC itself should be regulated within ±5% of
5V for the IMP692A/802M or within
±10% of 5V for the
IMP690A/802L/805L to insure that the storage capacitor does not
achieve an overvoltage state.
Note: SuperCapTM is a trademark of Baknor Industries
Figure 5. Capacitor as a backup power source
Figure 6. Capacitor as back-up Power Source - Voltage
clamped to 0.5V below VCC
690A_08.eps
+5V
GND
IMP692A
IMP802M
( ) IMP805L
100k
+
0.1F
VBATT
VCC
To
µP
To Static RAM
RESET
VOUT
+
690A_07.eps
+5V
GND
( ) IMP805L
0.1F
VBATT
VCC
To
µP
To Static RAM
RESET
(RESET)
VOUT
Operation Without a Backup Power Source
When operating without a back-up power source, the VBATT pin
should be connected to GND and VOUT should be connected to
VCC, since power source switchover will not occur. Connecting
VOUT to VCC eliminates the voltage drop due to the ON-resistance
of the PMOS switch.
Power-Fail Comparator
The Power Fail feature is an independent voltage monitoring
function that can be used for any number of monitoring activities.
The PFI function can provide an early sensing of power supply
failure by sensing the voltage of the unregulated DC ahead of
the regulated supply sensing seen by the backup-battery
switchover circuitry.
The PFI pin is compared to a 1.25V internal reference. If the volt-
age at the PFI pin is less than this reference voltage, the

PFO pin
goes low. By sensing the voltage of the raw DC power supply, the
microprocessor system can prepare for imminent power-loss,
especially if the battery backup supply is not enabled. The input
voltage at the PFI pin results from a simple resistor voltage
divider as shown in Figure 7.
Figure 7. Simple Voltage divider sets PFI trip point
5
1 25
2
1
2
R
R
R
V
+
< .
5
1 25
2
1
2
R
R
R
V
+
> .
690A_09.eps
+5V
GND
0V
PFO
+5V
A
A
B
B
IMP690A
IMP692A
IMP802L
IMP802M
IMP805L
R2
PFI
VCC
PFO
R1


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