參數(shù)資料
型號(hào)： RF5C62
廠商： RICOH COMPANY LTD
元件分類(lèi)： XO, clock
英文描述： REAL-TIME CLOCK
中文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO18
封裝： SOP-18
文件頁(yè)數(shù)： 24/48頁(yè)
文件大?。?/td> 419K
代理商： RF5C62
20
RP/RF/RS5C62
4. Adjustment of Oscillation Frequencies
4.1 Measurement of Oscillation Frequency
The oscillation frequency can be measured by using the INTR pin output (a cyclic interrupt). Note that its mea-
surement is affected by and cannot therefore be obtained with accuracy by the OSCIN pin input and the OSCOUT
pin output, which are directly measured by such means as a probe.
Frequency
counter
*
1
V
DD
V
DD
*
3
*
2
OSCOUT
OSCIN
C
D
C
G
INTR
*
1) Use a frequency counter with 6 or more readout digits in order to ensure
an accuracy on the order of ±1ppm.
*
2) Pull up the INTR pin to the V
DD
and set the CE pin to high.
*
3) Connect either one end of the oscillatory capacitors C
G
and C
D
to the V
DD
pin.
Power-on from 0V
*
4
*
5
*
6
*
7
*
8
Interrupt cycle
selection register
Read frequency counter
Control register 3
Ch
Control register 1
1h
Control register 2
0h
5h
*
4) Set both the TSTA and TSTB bits to “1” in the control register 3 to disable
the test circuit.
*
5) Set the ALEN bit to “0” and the BANK bit to “1” in the control register 1 to
disable an alarm interrupt.
*
6) Set both the CTFG and ALFG bits to “0” in the control register 2 to disable
an alarm interrupt and a cyclic interrupt.
*
7) Set a cyclic interrupt to 1Hz (or any other cycle) in the pulse mode.
*
8) An error of ±1ppm for every 1Hz amounts to a time lag of approximately
2.6 seconds per month.
[Example of monthly time lag calculation given an error of ±1ppm for
every 1Hz.
±1ppm x 60 seconds x 60 minutes x 24 hours x 30 days = 2.592
= approx. 2.6 seconds per month ]
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