PCF2128 Description
The PCF2128 is a ready to run CMOS real time clock/calendar with an integrated temperature pensated 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.
PCF2128 Key Features
- Integration of a 32.768 kHz quartz crystal in the same package as the RTC
- temperature pensated 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