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PCF8563 Datasheet(PDF) 33 Page - NXP Semiconductors |
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PCF8563 Datasheet(HTML) 33 Page - NXP Semiconductors |
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33 / 45 page  PCF8563 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. 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). |
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