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PCA2129T/Q900/2 Datasheet(PDF) 19 Page - NXP Semiconductors

Part # PCA2129T/Q900/2
Description  Automotive accurate RTC with integrated quartz crystal
PDF  84 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA2129T/Q900/2 Datasheet(HTML) 19 Page - NXP Semiconductors

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PCA2129
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 5 — 19 December 2014
19 of 84
NXP Semiconductors
PCA2129
Automotive accurate RTC with integrated quartz crystal
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 6.
Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)



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