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ADM8692 Datasheet(PDF) 13 Page - Analog Devices

Part No. ADM8692
Description  Microprocessor Supervisory Circuits
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Maker  AD [Analog Devices]
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ADM8692 Datasheet(HTML) 13 Page - Analog Devices

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ADM8690/ADM8691/ADM8692/ADM8693/ADM8695
Rev. B | Page 13 of 20
POWER-FAIL WARNING COMPARATOR
An additional comparator is provided for early warning of
failure in the microprocessor power supply. The power-fail
input (PFI) is compared to an internal 1.3 V reference. The
power-fail output (PFO) goes low when the voltage at PFI is less
than 1.3 V. Typically, PFI is driven by an external voltage divider
that senses either the unregulated dc input to the system 5 V
regulator or the regulated 5 V output. The voltage divider ratio
can be chosen such that the voltage at PFI falls below 1.3 V
several milliseconds before the 5 V power supply falls below the
reset threshold. PFO is normally used to interrupt the
microprocessor so that data can be stored in RAM and the shut-
down procedure executed before power is lost.
ADM869x
1.3V
PFO
R1
R2
POWER
FAIL
OUTPUT
POWER
FAIL
INPUT
INPUT
POWER
Figure 23. Power-Fail Comparator
Table 6. Input and Output Status in Battery Backup Mode
Signal
Status
V
OUT
V
OUT is connected to VBATT via an internal PMOS
switch.
RESET
Logic low.
RESET
Logic high. The open-circuit output voltage is equal
to V
OUT.
LOW LINE
Logic low.
BATT ON
Logic high. The open-circuit voltage is equal to V
OUT.
WDI
WDI is ignored. It is internally disconnected from the
internal pull-up resistor and does not source or sink
current as long as its input voltage is between GND
and V
OUT. The input voltage does not affect supply
current.
WDO
Logic high. The open circuit voltage is equal to V
OUT.
PFI
The power-fail comparator is turned off and has no
effect on the power-fail output.
PFO
Logic low.
CEIN
CEIN is ignored. It is internally disconnected from its
internal pull-up and does not source or sink current
as long as its input voltage is between GND and
V
OUT. The input voltage does not affect supply
current.
CEOUT
Logic high. The open circuit voltage is equal to V
OUT.
OSC IN
OSC IN is ignored.
OSC SEL
OSC SEL is ignored.


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