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PCF2127T/2Y データシート(PDF) 23 Page - NXP Semiconductors

部品番号 PCF2127T/2Y
部品情報  Accurate RTC with integrated quartz crystal for industrial applications
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2127T/2Y データシート(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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