PCF8523U Real-Time Clock (RTC) and calendar

The PCF8523 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. Data is transferred serially via the I²C-bus with a maximum data rate of 1000 kbit/s. Alarm and timer functions are available with the possibility to generate a wake-up signal on an interrupt pin. An offset register allows fine-tuning of the clock. The PCF8523 has a backup battery switch-over circuit, which detects power failures and automatically switches to the battery supply when a power failure occurs

产品特点 Features
  • Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
  • Resolution: seconds to years
  • Clock operating voltage: 1.0 V to 5.5 V
  • Low backup current: typical 150 nA at VDD = 3.0 V and Tamb = 25 °C
  • 2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I²C interface, read D1h, write D0h
  • Battery backup input pin and switch-over circuit
  • Freely programmable timer and alarm with interrupt capability
  • Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
  • Internal Power-On Reset (POR)
  • Open-drain interrupt or clock output pins
  • Programmable offset register for frequency adjustment
应用
  • Time keeping application
  • Battery powered devices
  • Metering
封装
型号 可订购的器件编号 订购码 (12NC) 产品状态 封装
PCF8523U/12AA/1 9352 938 87005 PCF8523U/12AA/1,00 量产 UC (OL-PCF8523U)
订货和供应
型号 订购码 (12NC) 可订购的器件编号 化学成分
PCF8523U/12AA/1 9352 938 87005 PCF8523U/12AA/1,00 PCF8523U/12AA/1
PCF8523U 技术支持
档案名称 标题 类型 格式
PCF8523U Real-Time Clock (RTC) and calendar Data sheet pdf
AN10441 Level shifting techniques in I2C-bus design Application note pdf
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AN10710 Features and applications of the PCF8523 I2C-bus extender Application note pdf
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75017424 NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns Leaflet pdf
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