參數(shù)資料
型號(hào)： RS5C348A-E2
廠商： RICOH COMPANY LTD
元件分類(lèi)： XO, clock
英文描述： Real-Time Clock
中文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO10
封裝： 6.40 X 3.50 MM, 1.25 MM HEIGHT, 0.5 MM PITCH, SSOP-10
文件頁(yè)數(shù)： 35/53頁(yè)
文件大小： 452K
代理商： RS5C348A-E2
R
×
5C348A/B
32
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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RS5C348B-E2 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:Real-Time Clock
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RS5C372B 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E1 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
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