參數(shù)資料
型號(hào)： R2033T-E2
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： 3 wire interface Real-Time Clock ICs
中文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO10
封裝： 4 X 2.90 MM, 1 MM HEIGHT, TSSOP-10
文件頁數(shù)： 32/50頁
文件大?。?/td> 542K
代理商： R2033T-E2
R2033K/T
Oscillation Adjustment Circuit
32
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, R2033K/T varies number of 1-second clock pulses once per 20 seconds.
When DEV bit is set to 1, R2033K/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:
The clock frequency output from the 32KOUT pin at normal temperature in the manner described in "
P29
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
相關(guān)PDF資料
PDF描述
R2033K 3 wire interface Real-Time Clock ICs
R2033K-E2 3 wire interface Real-Time Clock ICs
R2033T 3 wire interface Real-Time Clock ICs
R2043T 4-wire Serial Interface
R2043T-E2 4-wire Serial Interface
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