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參數(shù)資料
| 型號： | RV5C338A-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | DIODE ZENER SINGLE 200mW 8.2Vz 20mA-Izt 0.02549 0.1uA-Ir 6.5 SOD-323 3K/REEL |
| 中文描述： | REAL TIME CLOCK, PDSO10 |
| 封裝： | 4 X 2.90 MM, 1.20 MM HEIGHT, SSOP-10 |
| 文件頁數(shù)： | 34/52頁 |
| 文件大小： | 440K |
| 代理商： | RV5C338A-E2 |
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31
R
×
5C338A
Notes
1) Oscillation adjustment does not affect the frequency of 32.768-kHz clock pulses output from the 32KOUT
pin.
2) Oscillation adjustment value range: When the oscillation frequency is higher than the target frequency
(causing a time count gain), an appropriate time count gain ranges from
–
3.05ppm to
–
189.2ppm with the
settings of “0, 0, 0, 0, 0, 1, 0” to “0, 1, 1, 1, 1, 1, 1” written to the F
6
, F
5
, F
4
, F
3
, F
2
, F
1
, and F
0
bits in the
oscillation adjustment register, thus allowing correction of a time count gain of up to +189.2ppm.
Conversely, when the oscillation frequency is lower than the target frequency (causing a time count loss),
an appropriate time count gain ranges from +3.05ppm to +189.2ppm with the settings of “1, 1, 1, 1, 1, 1, 1”
to “1, 0, 0, 0, 0, 1, 0” written to the F
6
, F
5
, F
4
, F
3
, F
2
, F
1
, and F
0
bits in the oscillation adjustment register,
thus allowing correction of a time count loss of up to
–
189.2ppm.
2.4-2 When Oscillation Frequency is Equal to Target Frequency (There is Neither a Time Count Gain nor
a Time Count Loss)
Writing the oscillation adjustment value setting of “0”, “+1”, “
–
64”, or “
–
63” to the oscillation adjustment register
disables the oscillation adjustment circuit.
2.4-3 When Oscillation Frequency is Lower than Target Frequency (There is a Time Count Loss)
Oscillation adjustment value*
3
= (Oscillation frequency – Target frequency)
Oscillation frequency
×
3.051
×
10
–6
= (Oscillation frequency – Target frequency)
×
10
Oscillation adjustment value calculations are exemplified below.
(1)For an oscillation frequency of 32768.85Hz and a target frequency of 32768.05Hz:
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 of “0, 0, 0, 1, 0, 0, 1” to the F
6
, F
5
, F
4
, F
3
, F
2
, F
1
, and F
0
bits in the oscillation
adjustment register. Thus, an appropriate oscillation adjustment value in the presence of any time count gain
represents a distance from 01h.
(2)For an oscillation frequency of 32763.95Hz and a target frequency of 32768.05Hz:
Oscillation adjustment value = (32763.95 – 32768.05) / (32763.95
×
3.051
×
10
–6
) = (32763.95 – 32768.05)
×
10
= –41.015 = –41
To represent an oscillation adjustment value of
–
41 in 7-bit coded decimal notation, subtract 41(29h) from
128(80h) to obtain 57h. In this instance, write the settings of “1, 0, 1, 0, 1, 1, 1” in the F
6
, F
5
, F
4
, F
3
, F
2
, F
1
, and F
0
bits in the oscillation adjustment register. Thus, an appropriate oscillation adjustment value in the presence of
any time count loss represents a distance from 80h.
Oscillation adjustment involves an adjustment differential of approximately ±1.5ppm from the target frequency
at normal temperature.
..
..
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