PCF2127 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2127' PDF : 101 Pages View PDF
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
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Fig 9. Battery low detection behavior with bit BLIE set logic 1 (enabled)
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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).
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Fig 10. Typical application of the extra power fail detection function
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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