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PCF2129 Datasheet(PDF) 21 Page - NXP Semiconductors

Part # PCF2129
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2129 Datasheet(HTML) 21 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
21 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.5.3 Battery backup supply
The VBBS voltage on the output pin BBS is at the same potential as the internal operating
voltage Voper(int), depending on the selected battery switch-over function mode:
The output pin BBS can be used as a supply for external devices with battery backup
needs, such as SRAM (see Ref. 3 “AN11186”). For this case, Figure 10 shows the typical
driving capability when VBBS is driven from VDD.
Fig 9.
Battery low detection behavior with bit BLIE set logic 1 (enabled)
Table 20.
Output pin BBS
Battery switch-over function
mode
Conditions
Potential of
Voper(int) and
VBBS
standard
VDD > VBAT OR VDD > Vth(sw)bat
VDD
VDD < VBAT AND VDD < Vth(sw)bat
VBAT
direct switching
VDD > VBAT
VDD
VDD < VBAT
VBAT
disabled
only VDD available,
VBAT must be put to ground
VDD



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