PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 18

• Manufacturer Part Number: PCA2129T/Q900/2,51
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCA2129r

Specifications of PCA2129T/Q900/2,51

• Rohs: yes
• Function: Clock, Calendar, Alarm, Watchdog, Timestamp
• Rtc Bus Interface: I2C, SPI
• Date Format: Binary
• Time Format: Binary
• Supply Voltage - Max: 4.2 V
• Supply Voltage - Min: 1.8 V
• Maximum Operating Temperature: + 80 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Battery Backup Switching: Yes

NXP Semiconductors
PCA2129T
Product data sheet
8.5.2 Battery backup supply
The internal power supply (available on pin BBS) is equal to V
assured that there are decoupling capacitors on the pins V
The V
on the selected battery switch-over function mode:
Table 15.
Battery switch-over function mode
standard
direct switching
disabled
Fig 6.
Fig 7.
V
BBS
BBS
(mV)
−200
−400
−600
−800
− V
Battery switch-over circuit, simplified block diagram
Typical driving capability of V
current I
voltage on the output pin BBS is equal to the internal power supply, depending
0
DD
Output pin BBS
0
V
V
th(sw)bat
th(sw)bat
All information provided in this document is subject to legal disclaimers.
V
V
BAT
DD
BBS
comparators
Rev. 3 — 24 January 2013
V
V
Accurate RTC with integrated quartz crystal for automotive
CC
CC
2
LOGIC
BBS
Conditions
V
V
V
V
V
only V
DD
DD
DD
DD
BAT
logic
: (V
> V
< V
> V
< V
must be put to ground
4
BBS
DD
V
BAT
BAT
BAT
BAT
DD(int)
V
available,
V
BAT
 V
DD
OR V
AND V
DD
) with respect to the output load
DD
DD
switches
V
V
> V
DD(int)
DD(int)
DD
< V
th(sw)bat
6
, V
th(sw)bat
DD
BAT
V
or V
V
V
DD
I
BBS
DD
DD
(internal
power supply)
, and BBS.
PCA2129T
= 4.2 V
V
= 3 V
= 2 V
BAT
(mA)
BBS
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© NXP B.V. 2013. All rights reserved.
001aaj327
. It has to be
V
V
V
V
V
V
BBS
DD
BAT
DD
BAT
DD
8
equals
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