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PCF2129AT データシート(PDF) 17 Page - NXP Semiconductors

部品番号 PCF2129AT
部品情報  Integrated RTC, TCXO and quartz crystal
PDF  68 Pages
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2129AT データシート(HTML) 17 Page - NXP Semiconductors

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PCF2129A_1
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 13 January 2010
17 of 68
NXP Semiconductors
PCF2129A
Integrated RTC, TCXO and quartz crystal
The internal power supply (available on pin BBS) is equal to VDD or VBAT. It has to be
assured that there are decoupling capacitors on the pins VDD, VBAT, and BBS.
8.5.2 Battery backup supply
The VBBS voltage on the output pin BBS is equal to the internal power supply and depends
on the selected battery switch-over function mode:
Fig 6.
Battery switch-over circuit, simplified block diagram
001aag061
VCC
Vth(sw)bat
VDD
VBBS
(internal
power supply)
VDD
VDD(int)
VDD(int)
VDD(int)
VBAT
LOGIC
comparators
logic
switches
VCC
Vth(sw)bat
VBAT
Table 14.
Output pin BBS
Battery switch-over function mode
Conditions
VBBS equals
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
Fig 7.
Typical driving capability of VBBS: (VBBS − VDD) with respect to the output load
current IBBS
IBBS (mA)
0
8
6
4
2
001aaj431
VDD = 3 V
VDD = 2 V
−400
−600
−200
0
VBBS − VDD
(mV)
−800



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