南京日新PCF2129教案.pdf

南 京 日 新 科 技 有 限 公 司 D NAN JING ECH TECHNOLOGY CO。，LTD R PCF2129 PCF2129 A PPCCF 1. General description D R A The PCF2129 is a CMOS real time clock and calendar with an integrated temperature compensated crystal oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very 2 high accuracy and very low power consumption. The PCF2129 has a selectable I C-bus and SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function and many other features. 2. Features Temperature compensated crystal oscillator (TCXO) with integrated capacitors Accuracy: ±3 ppm from −20 °C to +70 °C Integration of a 32.768 kHz quartz crystal and oscillator in the same package