PCF8563 Просмотр технического описания (PDF) - Philips Electronics

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производитель

PCF8563

Real-time clock/calendar

Philips Electronics 

Philips Semiconductors

12. Application information

PCF8563

Real-time clock/calendar

handbook, full pagewidth

VDD

SDA

MASTER

TRANSMITTER/

1F

RECEIVER

SCL

VDD

SCL

CLOCK CALENDAR

OSCI PCF8563

OSCO

VSS

SDA

VDD

Fig 19. Application diagram.

R

SDA SCL

(I2C-bus)

R R: pull-up resistor

R = tr

Cb

MGM665

12.1 Quartz crystal frequency adjustment

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 the CLKOUT

pin. The frequency tolerance depends on the quartz crystal tolerance, the capacitor

tolerance and the device-to-device tolerance (on average ±5 × 10−6).

Average deviations of ±5 minutes per year can be easily achieved.

Method 2: OSCI trimmer — The oscillator is tuned to the required accuracy by

adjusting a trimmer capacitor on pin OSCI and measuring the 32.768 kHz signal

available after power-on at the CLKOUT pin.

Method 3: OSCO output — Direct output measurement on pin OSCO (accounting

for test probe capacitance).

9397 750 04855

Product specification

16 April 1999

© Philips Electronics N.V. 1999. All rights reserved.

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