【通信应用笔记】利用自适应校正随温度的极其精确的计时 AN2678 Application note Extremely accurate timekeeping over temperature using adaptive calibration Introduction Typical real-time clocks use common 32,768 Hz watch crystals. These are readily available and relatively inexpensive, but they suffer a loss of accuracy when operated over wide temperature ranges. However, the ultra-low power characteristics of 32 KHz oscillators make them ideal, and necessary, for battery backed applications. Conversely, the higher speed, AT-cut crystals used with microp……