PCF8563 datasheet(33/45 Pages) NXP

tên linh kiện	PCF8563

Giải thích chi tiết về linh kiện	Real-time clock/calendar

PDF	45 Pages

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PCF8563

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Product data sheet

Rev. 9 — 16 June 2011

33 of 45

NXP Semiconductors

PCF8563

Real-time clock/calendar

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).

PCF8563 bảng dữ liệu(PDF) 33 Page - NXP Semiconductors