PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 5

• 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
8. Functional description
PCF2129A_2
Product data sheet
The PCF2129A is a Real Time Clock (RTC) and calendar with an on-chip Temperature
Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal integrated
into the same package.
Address and data are transferred by a selectable 400 kHz Fast-mode I
SPI-bus with separate data input and output (see
SPI-bus is 6.5 Mbit/s.
The PCF2129A contains 28 8-bit registers that are used for many different functions, such
as clock, alarm, watchdog, timestamp etc. (see
The PCF2129A has a backup battery input pin and backup battery switch-over circuit
which monitors the main power supply and automatically switches to the backup battery
when a power failure condition is detected (see
maintained even when the main power supply is interrupted.
A battery low detection circuit monitors the status of the battery (see
the battery voltage goes below a certain threshold value, a flag is set to indicate that the
battery must be replaced soon. This ensures the integrity of the data during periods of
battery backup.
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
Integrated RTC, TCXO and quartz crystal
Section
Section
Section
8.1).
8.5.1). Accurate timekeeping is
9). The maximum speed of the
PCF2129A
Section
2
© NXP B.V. 2010. All rights reserved.
C-bus or a 3 line
8.5.3). When
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