PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 29

• Manufacturer Part Number: PCF2129AT/2,518
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCF2129r

Specifications of PCF2129AT/2,518

• 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: 1.2 V
• Maximum Operating Temperature: + 60 C
• Minimum Operating Temperature: - 15 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Battery Backup Switching: Yes
• Factory Pack Quantity: 2000

NXP Semiconductors
PCF2129AT
Product data sheet
8.9.5 Register Weekday_alarm
8.9.6 Alarm flag
Table 30.
[1]
When all enabled comparisons first match, the alarm flag AF (register Control_2) is set.
AF will remain set until cleared by command. Once AF has been cleared, it will only be set
again when the time increments to match the alarm condition once more. For clearing the
flags, see
Alarm registers which have their alarm enable bit AE_x at logic 1 are ignored.
Bit
7
6 to 3 -
2 to 0 WEEKDAY_ALARM
Fig 16. Alarm flag timing diagram
Default value.
Symbol
AE_W
Example where only the minute alarm is used and no other interrupts are enabled.
Section 8.10.5
Weekday_alarm - weekday alarm register (address 0Eh) bit description
All information provided in this document is subject to legal disclaimers.
INT when AIE = 1
minutes counter
minute alarm
Rev. 5 — 12 February 2013
AF
Value
0
1
-
0 to 6
[1]
44
45
Description
weekday alarm is enabled
weekday alarm is disabled
unused
weekday alarm information
Integrated RTC, TCXO and quartz crystal
45
PCF2129AT
001aaf903
46
© NXP B.V. 2013. All rights reserved.
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