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PCF2129AT датащи(PDF) 18 Page - NXP Semiconductors

номер детали PCF2129AT
подробное описание детали  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2129AT датащи(HTML) 18 Page - NXP Semiconductors

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PCF2129
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 7 — 19 December 2014
18 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.5.1.1
Standard mode
If VDD > VBAT OR VDD >Vth(sw)bat: Voper(int) is at VDD potential.
If VDD < VBAT AND VDD <Vth(sw)bat: Voper(int) is at VBAT potential.
Vth(sw)bat is the battery switch threshold voltage. Typical value is 2.5 V. In standard mode, the
battery switch-over works only for VDD > 2.5 V.
VDD may be lower than VBAT (for example VDD =3V, VBAT =4.1 V).
Fig 6.
Battery switch-over behavior in standard mode with bit BIE set logic 1 (enabled)



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