PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 17

• 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
8.5.1.3 Battery switch-over disabled: only one power supply (V
8.5.1.4 Battery switch-over architecture
The direct switching mode is useful in systems where V
This mode is not recommended if the V
V
compared to the standard mode because the monitoring of V
performed.
When the battery switch-over function is disabled:
The architecture of the battery switch-over circuit is shown in
Fig 5.
DD
•
•
•
•
V
DD
V
The power supply is applied on the V
The V
The internal power supply, available at the output pin BBS, is equal to V
The battery flag (BF) is always logic 0
(= 2.5 V)
= 3.3 V, V
th(sw)bat
(= 0 V)
V
V
INT
BAT
BF
DD
Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)
BAT
backup battery operation
pin must be connected to ground
BAT
All information provided in this document is subject to legal disclaimers.
 3.0 V). In direct switching mode, the power consumption is reduced
V
BBS
Rev. 3 — 24 January 2013
Accurate RTC with integrated quartz crystal for automotive
internal power supply (= V
DD
DD
and V
pin
BAT
values are similar (for example,
DD
BBS
is higher than V
DD
)
DD
Figure
)
and V
PCA2129T
6.
th(sw)bat
cleared via interface
© NXP B.V. 2013. All rights reserved.
BAT
DD
is not
at all times.
001aaj312
V
17 of 72
BBS