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PCF2127AT/1 bảng dữ liệu(PDF) 22 Page - NXP Semiconductors

tên linh kiện PCF2127AT/1
Giải thích chi tiết về linh kiện  Integrated RTC, TCXO and quartz crystal
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nhà sản xuất  NXP [NXP Semiconductors]
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PCF2127AT/1 bảng dữ liệu(HTML) 22 Page - NXP Semiconductors

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PCF2127A_2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
22 of 80
NXP Semiconductors
PCF2127A
Integrated RTC, TCXO and quartz crystal
8.6.4 Extra power fail detection function
The PCF2127A 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 9).
Usually R1 and R2 should be chosen such that the voltage at pin PFI
• is higher than 1.25 V at start-up
• falls below 1.25 V when VDD falls below a desired threshold voltage, Vth(uvp), defined
by Equation 1:
Fig 8.
Battery low detection behavior with bit BLIE set logic 1 (enabled)
001aaj322
internal power supply (= VBBS)
VBAT
BLF
Vth(bat)low
(= 2.5 V)
VBAT
VDD = VBBS
INT
Fig 9.
Typical application of the extra power fail detection function
001aaj678
PFO
PFI
15
14
RPU
VDD
VSS
R1
R2
PCF2127A
1.25 V
(internal)



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