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PCF8563 Datasheet(PDF) 22 Page - NXP Semiconductors |
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PCF8563 Datasheet(HTML) 22 Page - NXP Semiconductors |
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22 / 32 page  PCF8563_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 21 February 2008 22 of 32 NXP Semiconductors PCF8563 Real-time clock/calendar 12.1 Quartz frequency adjustment 12.1.1 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 × 10−6). Average deviations of ±5 minutes per year can be easily achieved. 12.1.2 Method 2: OSCI trimmer Using the 32.768 kHz signal available after power-on at pin CLKOUT, fast setting of a trimmer is possible. 12.1.3 Method 3: OSCO output Direct measurement of OSCO out (accounting for test probe capacitance). |
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