參數(shù)資料
型號(hào)： 935262218112
廠商： NXP SEMICONDUCTORS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁(yè)數(shù)： 14/32頁(yè)
文件大?。?/td> 711K
代理商： 935262218112
Philips Semiconductors
PCF8563
Real-time clock/calendar
Product specication
16 April 1999
21 of 30
9397 750 04855
Philips Electronics N.V. 1999. All rights reserved.
12. Application information
12.1 Quartz crystal frequency adjustment
Method 1: Fixed OSCI capacitor — By evaluating the average capacitance
necessary for the application layout a xed 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 × 106).
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).
Fig 19. Application diagram.
handbook, full pagewidth
MGM665
SCL
SDA
VSS
OSCI
OSCO
CLOCK CALENDAR
PCF8563
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
VDD
SDA
SCL
RR
VDD
(I2C-bus)
R: pull-up resistor
R =
1 F
tr
Cb
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