Integrated RTC/TCXO/Crystal - NXP Semiconductors
Description
PCF2128
Integrated RTC / TCXO / Crystal
Rev.
00.
03 — 4 June 2007
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Preliminary [short] data sheet
1.
General description
The PCF2128 is a ready to run CMOS real time clock/calendar with an integrated temperature compensated crystal oscillator (TCXO).
In timekeeping applications the high accuracy of the PCF2128 allows it to be used as a replacement for costly and higher powered long wave receivers or GPS receivers.
A programmable battery switch-over circuit enables an uninterruptible power supply and consequently continuous timekeeping.
The PCF2128 additionally features 512 bytes of general purpose RAM, a programmable watchdog, a time stamp facility and a voltage monitoring facility.
Programming is possible using either an SPI or an I2C-bus interface.
2.
Features
Integration of a 32.
768 kHz quartz crystal in the same package as the RTC temperature compensated crystal oscillator (TCXO) with integrated capacitors.
accuracy: typically 3 ppm from−20 °C to +70 °C, typically 5 ppm from −40 °C to +85 °C provides year, month, day, weekday, hours, minutes and seconds programmable alarm function with interrupt capability programmable countdown timer with interrupt capability programmable watchdog timer with interrupt and reset capability 512 bytes of general purpose static RAM 1 second or 1 minute interrupt output
oscillator stop detection
two line bi-directional 1 MHz fast mode plus I2C interface timestamp input power-on reset 3 line SPI interface with separate data input and output (maximum speed 6.
5 Mbits/s) programmable square wave output pin
timestamp function with interrupt capability battery backup input pin and switch-over I2C-bus slave address: read A3H and circuitry write A2H extra power fail detection with input and clock operating voltage: to 5.
5 V output pins battery low detection low backup current; typical 0.
95 μA at VDD = 3.
0 V and Tamb = 25 °C battery backed output voltage pin selec...
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