pcf2129a NXP Semiconductors, pcf2129a Datasheet
pcf2129a
Manufacturer Part Number
pcf2129a
Description
Integrated Rtc, Tcxo And Quartz Crystal
Manufacturer
NXP Semiconductors
Datasheet
1.PCF2129A.pdf
(68 pages)
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1. General description
2. Features
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
The PCF2129A is a CMOS
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
I
function, a timestamp function, and many other features.
2
C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog
PCF2129A
Integrated RTC, TCXO and quartz crystal
Rev. 01 — 13 January 2010
Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
Accuracy: ±3 ppm from −15 °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
Two line bidirectional 1 MHz Fast-mode Plus (Fm+) I
pin SDA)
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 V
Automatic leap year correction
with interrupt capability
detection of two different events on one multilevel input pin (e.g. for tamper
detection)
1
real time clock and calendar with an integrated Temperature
DD
= 3.0 V and T
Section
2
C-bus interface (I
17.
amb
= 25 °C
Product data sheet
OL
= 20 mA at
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