PCF8563TSSLASH4 datasheet(36/50 Pages) NXP

36 / 50 page

PCF8563

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Product data sheet

Rev. 10 — 3 April 2012

36 of 50

NXP Semiconductors

PCF8563

Real-time clock/calendar

14. Application information

14.1 Quartz frequency adjustment

14.1.1 Method 1: fixed OSCI capacitor

By evaluating the average capacitance necessary for the application layout, a fixed

capacitor can be used. The frequency is best measured via the 32.768 kHz signal

available after power-on at pin CLKOUT. The frequency tolerance depends on the quartz

crystal tolerance, the capacitor tolerance and the device-to-device tolerance (on average

5 ppm). Average deviations of 5 minutes per year can be easily achieved.

14.1.2 Method 2: OSCI trimmer

Using the 32.768 kHz signal available after power-on at pin CLKOUT, fast setting of a

trimmer is possible.

14.1.3 Method 3: OSCO output

Direct measurement of OSCO out (accounting for test probe capacitance).

Fig 29. Application diagram

mgm665

SCL

SDA

VSS

OSCI

OSCO

CLOCK CALENDAR

PCF8563

SDA

SCL

MASTER

TRANSMITTER/

RECEIVER

VDD

SDA

SCL

VDD

(I2C-bus)

R: pull-up resistor

R =

1 F

100 nF

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