PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 6

• Manufacturer Part Number: PCF2129AT/1,512
• Description: IC REAL TIME CLK/CALENDAR 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2129AT/1,512

• Package / Case: 20-SOIC (7.5mm Width)
• Date Format: YY-MM-DD-dd
• Time Format: HH:MM:SS (12/24 hr)
• Interface: I²C, SPI
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Clock, Alarm, Watchdog, Timestamp
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C, SPI
• Supply Current: 800 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4960-5; 935288599512

NXP Semiconductors
PCF2129A_2
Product data sheet
8.1 Register overview
The PCF2129A contains 28 8-bit registers (see
address register: the built-in address register will increment automatically after each read
or write of a data byte up to the register 1Bh. After register 1Bh the auto-incrementing will
wrap around to address 00h (see
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
Fig 3.
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The first three registers (memory address 00h, 01h, and 02h) are used as control
registers (see
The memory addresses 03h through to 09h are used as counters for the clock
function (seconds up to years). The date is automatically adjusted for months with
fewer than 31 days, including corrections for leap years. The clock can operate in
12-hour mode with an AM/PM indication or in 24-hour mode (see
Addresses 0Ah through 0Eh define the alarm function. It can be selected that an
interrupt is generated when an alarm event occurs (see
The register 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
(default) down to 1 Hz for use as a system clock, a microcontroller clock etc. can be
chosen (see
Address registers 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
the watchdog times out.
Address registers 12h to 18h are used for the timestamp function. When the trigger
event happens, the actual time is saved in the timestamp registers (see
Address register 19h is used for the correction of the crystal aging effect (see
Section
Address registers 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.
Handling address registers
8.4.1).
Section
All information provided in this document is subject to legal disclaimers.
Table
Section
8.8.8).
10).
Rev. 02 — 7 May 2010
8.2).
address register
Figure
1Ah
1Bh
00h
01h
02h
03h
19h
...
Table
3).
9). CLKOUT frequencies of 32.768 kHz
Table
auto-increment
Integrated RTC, TCXO and quartz crystal
Table
32). An interrupt will be generated when
wrap around
4) with an auto-incrementing
001aaj398
Section
PCF2129A
8.9).
Section
© NXP B.V. 2010. All rights reserved.
Section
8.8).
6 of 69
8.11).