PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 16

• 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
8.5.1.1 Standard mode
8.5.1.2 Direct switching mode
When a power failure condition occurs and the power supply switches to the battery, the
following sequence occurs:
The interface is disabled in battery backup operation:
If V
If V
If V
If V
1. The battery switch flag BF (register Control_3) is set logic 1.
2. An interrupt is generated if the control bit BIE (register Control_3) is enabled
3. If the control bit BTSE (register Control_3) is logic 1, the timestamp registers store the
4. The battery switch flag BF is cleared by command; it must be cleared to clear the
Fig 4.
•
•
V
DD
DD
DD
DD
DD
V
(see
time and date when the battery switch occurred (see
interrupt.
Interface inputs are not recognized, preventing extraneous data being written to the
device
Interface outputs are high-impedance
(= 2.5 V)
th(sw)bat
(= 0 V)
> V
< V
> V
< V
V
V
INT
BAT
BF
DD
Section
V
battery switch-over works only for V
V
Battery switch-over behavior in standard mode with bit BIE set logic 1 (enabled)
BAT
BAT
BAT
BAT
th(sw)bat
DD
backup battery operation
may be lower than V
OR V
AND V
the internal power supply is V
the internal power supply is V
All information provided in this document is subject to legal disclaimers.
is the battery switch threshold voltage. Typical value is 2.5 V. In standard mode, the
8.12.6).
V
DD
BBS
DD
> V
Rev. 3 — 24 January 2013
< V
th(sw)bat
Accurate RTC with integrated quartz crystal for automotive
th(sw)bat
BAT
(for example V
, the internal power supply is V
, the internal power supply is V
DD
internal power supply (= V
> 2.5 V.
DD
BAT
DD
.
.
= 3 V, V
BAT
= 4.1 V).
BBS
Section
)
DD
BAT
8.11.4).
.
PCA2129T
.
cleared via interface
© NXP B.V. 2013. All rights reserved.
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BBS