使用小型有效的RTC减少功耗 NXP ultra-low-power RTC/calendars PCF8523 & PCF2123 Save power with small, ultra-efficient RTCs Designed to perform critical time-keeping functions in a range of applications, these small, highly efficient RTC/calendars fit nearly anywhere and cut power demands by as much as 60 percent. Key features Key applications } 32.768 kHz quartz crystal } Time-keeping functions } Resolution: seconds to years } Battery-powered devices } Freely programmable timer and alarm function w……