PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 32

• Manufacturer Part Number: PCF2127AT/1,518
• Description: IC RTC/CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2127AT/1,518

• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Time Format: HH:MM:SS (12/24 hr)
• Memory Size: 512B
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
• Rtc Memory Size: 512 bytes
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C
• Supply Current: 2600 nA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
PCF2127A_2
Product data sheet
8.10.1 Register Second_alarm
8.10 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 29.
[1]
Bit
7
6 to 4 SECOND_ALARM
3 to 0
Fig 19. 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. 02 — 7 May 2010
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
Integrated RTC, TCXO and quartz crystal
second alarm is enabled
second alarm is disabled
second alarm information coded in BCD
format
set alarm flag AF
AE_S = 1
example
013aaa236
PCF2127A
Section
1
0
(1)
© NXP B.V. 2010. All rights reserved.
Figure
8.13.5.
19).
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