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ASM690AEPA Datasheet(PDF) 7 Page - ON Semiconductor

Part # ASM690AEPA
Description  Power Supply Supervisor
Download  12 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ASM690AEPA Datasheet(HTML) 7 Page - ON Semiconductor

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ASM690A/692A, ASM802L/802M, ASM805L
http://onsemi.com
7
that the capacitor voltage remain below the maximum
voltages shown in Table 6. Although the circuit of Figure 6
shows the most simple way to connect the SuperCap, this
circuit cannot insure that an over voltage condition will not
occur since the capacitor will ultimately charge up to VCC.
To insure that an over voltage condition does not occur, the
circuit of Figure 7 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 5 V for the ASM692A/802M or within ±10%
of 5 V for the ASM690A/802L/805L to insure that the
storage capacitor does not achieve an over voltage state.
Figure 6. Capacitor as a Backup Power Source
Figure 7. Capacitor as a Backup Power Source
Voltage Clamped to 0.5 V below VCC
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 1.25 V internal reference. If the voltage 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 8.
Figure 8. Simple Voltage Divider Sets PFI Trip Point
Power Fail Hysteresis
A noise margin can be added to the simple monitoring
circuit of Figure 8 by adding positive feedback from the
PFO pin. The circuit of Figure 9 adds this positive “latching”
effect by means of an additional resistor R3 connected
between PFO and PFI which helps in pulling PFI in the
direction of PFO and eliminating an indecision at the trip
point. Resistor R3 is normally about 10 times higher in
resistance than R2 to keep the hysteresis band reasonable
and should be larger than 10 k
W to avoid excessive loading
on the PFO pin. The calculations for the correct values of
resistors to set the hysteresis thresholds are given in
Figure 9. A capacitor can be added to offer additional noise
rejection by low−pass filtering.


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