參數(shù)資料
型號： R2023T
廠商： Ricoh Co., Ltd.
英文描述： 2-wire Serial Interface Real Time Clock IC
中文描述： 2線串行接口實時時鐘芯片
文件頁數(shù)： 33/50頁
文件大?。?/td> 512K
代理商： R2023T
R2023K/T
Oscillation Adjustment Circuit
33
The oscillation adjustment circuit can be used to correct a time count gain or loss with high precision by varying the
number of 1-second clock pulses once per 20 seconds or 60 seconds. When DEV bit in the Oscillation Adjustment
Register is set to 0, R2023K/T varies number of 1-second clock pulses once per 20 seconds. When DEV bit is set
to 1, R2023K/T varies number of 1-second clock pulses once per 60 seconds. The oscillation adjustment circuit
can be disabled by writing the settings of "*, 0, 0, 0, 0, 0, *" ("*" representing "0" or "1") to the F6, F5, F4, F3, F2, F1,
and F0 bits in the oscillation adjustment circuit. Conversely, when such oscillation adjustment is to be made, an
appropriate oscillation adjustment value can be calculated by the equation below for writing to the oscillation
adjustment circuit.
(1) When Oscillation Frequency (* 1) Is Higher Than Target Frequency (* 2) (Causing Time Count
Gain)
When DEV=0:
Oscillation adjustment value (*3) = (Oscillation frequency - Target Frequency + 0.1)
Oscillation frequency
×
3.051
×
10
-6
≈
(Oscillation Frequency – Target Frequency)
×
10 + 1
When DEV=1:
Oscillation adjustment value (*3) = (Oscillation frequency - Target Frequency + 0.0333)
Oscillation frequency
×
1.017
×
10
-6
≈
(Oscillation Frequency – Target Frequency)
×
30 + 1
* 1) Oscillation frequency:
Frequency of clock pulse output from the 32KOUT pin at normal temperature in the manner described in "
P30
Measurement of Oscillation Frequency".
* 2) Target frequency:
Desired frequency to be set. Generally, a 32.768-kHz quartz crystal unit has such temperature
characteristics as to have the highest oscillation frequency at normal temperature. Consequently, the quartz
crystal unit is recommended to have target frequency settings on the order of 32.768 to 32.76810 kHz
(+3.05ppm relative to 32.768 kHz). Note that the target frequency differs depending on the environment or
location where the equipment incorporating the RTC is expected to be operated.
* 3) Oscillation adjustment value:
Value that is to be finally written to the F0 to F6 bits in the Oscillation Adjustment Register and is
represented in 7-bit coded decimal notation.
(2) When Oscillation Frequency Is Equal To Target Frequency (Causing Time Count neither Gain
nor Loss)
Oscillation adjustment value = 0, +1, -64, or –63
(3) When Oscillation Frequency Is Lower Than Target Frequency (Causing Time Count Loss)
When DEV=0:
Oscillation adjustment value = (Oscillation frequency - Target Frequency)
Oscillation frequency
×
3.051
×
10
-6
≈
(Oscillation Frequency – Target Frequency)
×
10
When DEV=1:
Oscillation adjustment value = (Oscillation frequency - Target Frequency)
Oscillation frequency
×
1.017
×
10
-6
≈
(Oscillation Frequency – Target Frequency)
×
30
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