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Typenumber

更新时间： 2022-03-25 21:38:52

品牌	Logo	应用领域
恩智浦 - NXP		时钟
页数	文件大小	规格书
75页	700K
描述
Real-Time Clock (RTC) and calendar

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Typenumber 数据手册

PCF8523

Real-Time Clock (RTC) and calendar

Rev. 4 — 5 July 2012

Product data sheet

1. General description

The PCF8523 is a CMOS¹Real-Time Clock (RTC) and calendar optimized for low power

consumption. Data is transferred serially via an 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.

2. Features and benefits

 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 V_DD= 3.0 V and T_amb= 25 C

 2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I²C interface, read D1h, write D0h²

 Battery backup input pin and switch-over circuit

 Freely programmable timer and alarm with interrupt capability

 Selectable integrated oscillator load capacitors for C_L= 7 pF or C_L= 12.5 pF

 Internal Power-On Reset (POR)

 Open-drain interrupt or clock output pins

 Programmable offset register for frequency adjustment

3. Applications

 Time keeping application

 Battery powered devices

 Metering

1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.

2. Devices with other I²C-bus slave addresses can be produced on request.

12 3 4 5 6 7...75

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