PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 6

• 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
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
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•
•
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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 system clock, 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.
8.11).
8.4.1).
Section
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 January 2013
8.8.8).
Accurate RTC with integrated quartz crystal for automotive
Table
11).
Table
Table
10). CLKOUT frequencies of
33). An interrupt will be generated
PCA2129T
© NXP B.V. 2013. All rights reserved.
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