參數(shù)資料
型號(hào)： 935192230015
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： REAL TIME CLOCK, UUC
封裝： DIE
文件頁(yè)數(shù)： 16/31頁(yè)
文件大小： 213K
代理商： 935192230015
1997 Mar 25
23
Philips Semiconductors
Product specication
Low power clock/calendar
PCF8593
14 APPLICATION INFORMATION
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 1 Hz signal which can
be programmed to occur at the interrupt output (pin 7). 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
achieved.
14.1.2
METHOD 2: OSCI TRIMMER
Using the alarm function (via the I2C-bus) a signal faster
than 1 Hz can be generated at the interrupt output for fast
setting of a trimmer.
Procedure:
Power-on
Apply RESET
Initialization (alarm functions).
Routine:
Set clock to time T and set alarm to time T + T
At time T + T (interrupt) repeat routine.
14.1.3
METHOD 3: DIRECT OUTPUT
Direct measurement of oscillator output (accounting for
test probe capacitance).
Fig.23 Application diagram.
(1) Example Philips DLC 196 Double-Layer Capacitor family.
handbook, full pagewidth
MBD825
RESET
SCL
SDA
V SS
OSCI
OSCO
CLOCK CALENDAR
PCF8593
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
RESET
V DD
SDA
SCL
RR
V DD
(I C-bus)
2
R: pull-up resistor
R =
r
(1)
1 F
t
C BUS
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