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参数资料
| 型号： | R2051K02 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, QCC12 |
| 封装： | 2 X 2 MM, 0.85 MM PITCH, ULTRA-COMPACT, FFP, 12 PIN |
| 文件页数： | 27/53页 |
| 文件大小： | 343K |
| 代理商： | R2051K02 |
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R2051 Series
12345
Rev.1.04
- 33 -
l
Oscillation Adjustment Circuit
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, R2051 varies number of 1-second clock pulses once per 20 seconds. When DEV bit is set to
1, R2051 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 CLKOUT pin at normal temperature in the manner described in
" P31
l Measurement of Oscillation Frequency".
* 2)
Target frequency:
Desired frequency to be set.
Generally, a 32.768-kHz crystal oscillator has such temperature
characteristics as to have the highest oscillation frequency at normal temperature. Consequently, the
crystal oscillator 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
Oscillation adjustment value calculations are exemplified below
(A) For an oscillation frequency = 32768.85Hz and a target frequency = 32768.05Hz
When setting DEV bit to 0:
Oscillation adjustment value = (32768.85 - 32768.05 + 0.1) / (32768.85
× 3.051 × 10-6)
≈ (32768.85 - 32768.05) × 10 + 1
= 9.001
≈ 9
In this instance, write the settings (DEV,F6,F5,F4,F3,F2,F1,F0)=(0,0,0,0,1,0,0,1) in the oscillation adjustment
register. Thus, an appropriate oscillation adjustment value in the presence of any time count gain represents a
distance from 01h.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R2051K02-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S01-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S02-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S03-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051T01-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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