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PCF2127T/2Y Datasheet(PDF) 23 Page - NXP Semiconductors

No. de pieza PCF2127T/2Y
Descripción Electrónicos  Accurate RTC with integrated quartz crystal for industrial applications
PDF  100 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2127T/2Y Datasheet(HTML) 23 Page - NXP Semiconductors

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PCF2127
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 8 — 19 December 2014
23 of 100
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.6.3 Extra power fail detection function
The PCF2127 has an extra power fail detection circuit which compares the voltage at the
power fail input pin PFI to an internal reference voltage equal to 1.25 V.
If VPFI < 1.25 V, the power fail output PFO is driven LOW. PFO is an open-drain, active
LOW output which requires an external pull-up resistor in any application.
The extra power fail detection function is typically used as a low voltage detection for the
main power supply VDD (see Figure 10).
Fig 9.
Battery low detection behavior with bit BLIE set logic 1 (enabled)
Fig 10. Typical application of the extra power fail detection function



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