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TC3404 датащи(PDF) 10 Page - Microchip Technology

номер детали TC3404
подробное описание детали  1.8V Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter with a Power Fault Monitor
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
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TC3404
DS21413B-page 10
© 2002 Microchip Technology Inc.
3.3
Power Fail Detector
The Power Fail detector is a comparator in which the
inverting input is connected to the internal voltage
reference. The non-inverting input is the PFI pin of the
TC3404 and the PFO pin is the active low, open drain
output. This comparator is suitable as an early warning
fail or low battery indicator. In a typical application,
where a voltage regulator is being used to supply
power to a system, the Power Fail comparator would
monitor the input voltage to the regulator while the VDD
monitor would measure the output voltage of the
regulator. Both PFO and RESET would drive interrupt
pins of a microcontroller.
ThePower Fail detector may beusedas a Wake-upor
Watchdog Timer. The Typical Application circuit shows
an RC network on PFI with the capacitor tied to a
tristated
µC I/O pin. If R4 is 1 MΩ and C2 is 10µF, the
time constant is roughly ten seconds. The
µC resets
the RC network by driving the I/O tied to PFI low and
then tristating it. The RC network will ramp to 1.23V in
roughly 9 seconds, assuming a VBATT of 3.0V. With
PFO tied to a
µC input or interrupt, the µC will see a low
to high transition on PFO when the voltage on PFI
exceeds 1.23V. The PFO output is specified to be valid
for VDD =1.3 to 5.5V.


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