PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 6

• 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
Table 5.
Bit positions labeled as - are not implemented and will return 0 when read. Bits labeled as T must always be written with
logic 0. Bits labeled as X are undefined at power-on and unchanged by subsequent resets.
PCF2129AT
Product data sheet
Address Register name
Control registers
00h
01h
02h
Time and date registers
03h
04h
05h
06h
07h
08h
09h
Alarm registers
0Ah
0Bh
0Ch
Control_1
Control_2
Control_3
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Second_alarm
Minute_alarm
Hour_alarm
Register overview
When one of the RTC registers is written or read, the content of all counters is temporarily
frozen. This prevents a faulty writing or reading of the clock and calendar during a carry
condition (see
•
•
•
•
•
•
The register at address 0Fh defines the temperature measurement period and the
clock out mode. The temperature measurement can be selected from every 4 minutes
(default) down to every 30 seconds (see
32.768 kHz (default) down to 1 Hz for use as a system clock, a microcontroller clock,
and so on, can be chosen (see
The registers at addresses 10h and 11h are used for the watchdog timer functions.
The watchdog timer has four selectable source clocks allowing for timer periods from
less than 1 ms to greater than 4 hours (see
when the watchdog times out.
The registers at addresses 12h to 18h are used for the timestamp function. When the
trigger event happens, the actual time is saved in the timestamp registers (see
Section
The register at address 19h is used for the correction of the crystal aging effect (see
Section
The registers at addresses 1Ah and 1Bh are for internal use only.
The registers Seconds, Minutes, Hours, Days, Months, and Years are all coded in
Binary Coded Decimal (BCD) format to simplify application use. Other registers are
either bit-wise or standard binary.
Bit
7
EXT_
TEST
PWRMNG[2:0]
-
-
-
-
-
YEARS (0 to 99)
AE_S
AE_M
AE_H
MSF
OSF
8.11).
8.4.1).
WDTF
SECONDS (0 to 59)
MINUTES (0 to 59)
-
-
-
-
SECOND_ALARM (0 to 59)
MINUTE_ALARM (0 to 59)
-
6
T
Section
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 12 February 2013
TSF2
AMPM
DAYS (1 to 31)
-
-
AMPM
5
STOP
HOURS (0 to 23) in 24 h mode
HOUR_ALARM (0 to 23) in 24 h mode
8.8.8).
HOURS (1 to 12) in 12 h mode
-
MONTHS (1 to 12)
HOUR_ALARM (1 to 12) in 12 h mode
4
TSF1
AF
BTSE
Table
-
3
POR_
OVRD
T
BF
11).
Table
Integrated RTC, TCXO and quartz crystal
Table
2
12_24
TSIE
BLF
WEEKDAYS (0 to 6)
10). CLKOUT frequencies of
33). An interrupt will be generated
1
MI
AIE
BIE
PCF2129AT
T
0
SI
BLIE
© NXP B.V. 2013. All rights reserved.
0000 0000
1XXX XXXX
Reset value
0000 0000
0000 0000
1XXX XXXX
- XXX XXXX
- - XX XXXX
- - XX XXXX
- - XX XXXX
- - - - - XXX
- - - X XXXX
XXXX XXXX
1XXX XXXX
1 - XX XXXX
1 - XX XXXX
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