PCF8563BS NXP [NXP Semiconductors], PCF8563BS Datasheet - Page 22

• Manufacturer Part Number: PCF8563BS
• Description: Real-time clock/calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8563_6
Product data sheet
12.1.1 Method 1: fixed OSCI capacitor
12.1.2 Method 2: OSCI trimmer
12.1.3 Method 3: OSCO output
12.1 Quartz frequency adjustment
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
Using the 32.768 kHz signal available after power-on at pin CLKOUT, fast setting of a
trimmer is possible.
Direct measurement of OSCO out (accounting for test probe capacitance).
5
10
6
). Average deviations of 5 minutes per year can be easily achieved.
Rev. 06 — 21 February 2008
Real-time clock/calendar
PCF8563
© NXP B.V. 2008. All rights reserved.
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