PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 27

• 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
8.9.1 Register Second_alarm
8.9 Alarm function
When one or more of the alarm bit fields are loaded with a valid second, minute, hour, day,
or weekday and its corresponding alarm enable bit (AE_x) is logic 0, then that information
is compared with the actual second, minute, hour, day, and weekday (see
The generation of interrupts from the alarm function is described in
Table 26.
[1]
Bit
7
6 to 4 SECOND_ALARM
3 to 0
Fig 15. Alarm function block diagram
Default value.
(1) Only when all enabled alarm settings are matching.
Symbol
AE_S
Second_alarm - second alarm register (address 0Ah) bit description
check now signal
All information provided in this document is subject to legal disclaimers.
WEEKDAY ALARM
SECOND ALARM
WEEKDAY TIME
SECOND TIME
HOUR ALARM
MINUTE ALARM
MINUTE TIME
DAY ALARM
HOUR TIME
DAY TIME
Rev. 3 — 24 January 2013
Accurate RTC with integrated quartz crystal for automotive
Value
0
1
0 to 5
0 to 9
[1]
=
=
=
=
=
Place value Description
-
-
ten’s place
unit place
AE_W
AE_S
AE_M
AE_H
AE_D
second alarm is enabled
second alarm is disabled
second alarm information coded in BCD
format
set alarm flag AF
AE_S = 1
example
013aaa236
PCA2129T
Section
1
0
(1)
© NXP B.V. 2013. All rights reserved.
Figure
8.12.4.
15).
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