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PCF2129 Fiches technique(PDF) 19 Page - NXP Semiconductors

No de pièce PCF2129
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2129 Fiches technique(HTML) 19 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
19 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.5.1.2
Direct switching mode
If VDD > VBAT: Voper(int) is at VDD potential.
If VDD < VBAT: Voper(int) is at VBAT potential.
The direct switching mode is useful in systems where VDD is always higher than VBAT.
This mode is not recommended if the VDD and VBAT values are similar (for example,
VDD = 3.3 V, VBAT  3.0 V). In direct switching mode, the power consumption is reduced
compared to the standard mode because the monitoring of VDD and Vth(sw)bat is not
performed.
8.5.1.3
Battery switch-over disabled: only one power supply (VDD)
When the battery switch-over function is disabled:
• The power supply is applied on the VDD pin
• The VBAT pin must be connected to ground
• Voper(int) is at VDD potential
• The battery flag (BF) is always logic 0
Fig 7.
Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)



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