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PCF2127T/2Y bảng dữ liệu(PDF) 23 Page - NXP Semiconductors |
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PCF2127T/2Y bảng dữ liệu(HTML) 23 Page - NXP Semiconductors |
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23 / 100 page ![]() 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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