사용자 설명서차례1. Introduction32. Features43. Comparison63.1 Event counter mode64. Power-on reset (POR)85. Voltage-low detector86. Oscillator96.1 Oscillation allowance156.2 Using an external oscillator157. Crystal and crystal selection167.1 Modes which don’t work177.2 Effect of temperature178. Capacitors and capacitor selection199. Accuracy2010. Oscillator tuning2210.1 PCF2123 Offset register2411. Century and leap year, Daylight Saving Time2511.1 Century tracking2511.2 Year and leap year tracking2511.3 Daylight Saving Time (DST)2512. Initialization and setting of alarm and timer2612.1 Initialization of the RTC and setting the time2612.2 Alarm2712.3 Setting the timer2913. Backup power supply3013.1 Lithium Primary cells3013.2 NiCd and NiMH secondary batteries3213.3 Capacitors3313.3.1 Charging the backup capacitor3413.3.2 Estimation of backup time with capacitor3413.4 Diode selection3514. PCB layout guidelines3615. Partial circuit switch down3816. Hints to keep power consumption low3917. First period inaccuracy when using the timer4318. Timing requirements for I2C read and write4519. Troubleshooting4819.1 Oscillator startup time4819.2 Checking for oscillation4819.3 No communication via I2C-bus4919.4 Wrong time and date, wrong clock speed5020. References5021. Legal information5121.1 Definitions5121.2 Disclaimers5121.3 Trademarks5122. Contents52크기: 603킬로바이트페이지: 52Language: English매뉴얼 열기