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PCF2129A_10 Datasheet, PDF (1/69 Pages) NXP Semiconductors – Integrated RTC, TCXO and quartz crystal | |||
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PCF2129A
Integrated RTC, TCXO and quartz crystal
Rev. 02 â 7 May 2010
Product data sheet
1. General description
The PCF2129A is a CMOS1 Real Time Clock (RTC) and calendar with an integrated
Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz
crystal optimized for very high accuracy and very low power consumption. The PCF2129A
has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a
programmable watchdog function, a timestamp function, and many other features.
2. Features and benefits
 Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
 Typical accuracy: ±3 ppm from â15 °C to +60 °C
 Integration of a 32.768 kHz quartz crystal and oscillator in the same package
 Provides year, month, day, weekday, hours, minutes, and seconds
 Timestamp function
 with interrupt capability
 detection of two different events on one multilevel input pin (e.g. for tamper
detection)
 Two line bidirectional 400 kHz Fast-mode I2C-bus interface (IOL = 3 mA at pin
SDA/CE)
 3 line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
 Battery backup input pin and switch-over circuitry
 Battery backed output voltage pin
 Battery low detection function
 Extra power fail detection function with input and output pins
 Power-On Reset Override (PORO)
 Oscillator stop detection function
 Interrupt output (open-drain)
 Programmable 1 second or 1 minute interrupt
 Programmable watchdog timer with interrupt and reset capability
 Programmable alarm function with interrupt capability
 Programmable square wave open-drain output pin
 Clock operating voltage: 1.2 V to 4.2 V
 Low supply current: typical 0.65 μA at VDD = 3.0 V and Tamb = 25 °C
 Automatic leap year correction
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.
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