PCF8523T Datasheet PDF - NXP

Overview

●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.

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●## 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

●## Target Applications

● Time keeping application

● Battery powered devices

● Metering

●## Features