Datasheet > PCF8523U-12AA-1

PCF8523U-12AA-1

更新时间： 2024-11-19 10:16:47

品牌	Logo	应用领域
恩智浦 - NXP		时钟
页数	文件大小	规格书
66页	1278K
描述
Real-Time Clock (RTC) and calendar

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PCF8523U-12AA-1 数据手册

PCF8523

Real-Time Clock (RTC) and calendar

Rev. 3 — 30 March 2011

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

 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 19.

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