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參數(shù)資料
| 型號(hào)： | R2033K |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | 3 wire interface Real-Time Clock ICs |
| 中文描述： | 3線接口實(shí)時(shí)時(shí)鐘芯片 |
| 文件頁數(shù)： | 32/50頁 |
| 文件大?。?/td> | 542K |
| 代理商： | R2033K |
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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-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 |
| R2043K | 4-wire Serial Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R2033K-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs |
| R2033T | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs |
| R2033T-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs |
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