PCF8563 查看數據表（PDF） - Tiger Electronic

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产品描述 (功能)

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PCF8563

Real-time Clock/Calendar

Tiger Electronic 

APPLICATION CIRCUIT

PCF8563

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).

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