- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384875 > R2043T-E2 (RICOH COMPANY LTD) 4-wire Serial Interface PDF資料下載
參數(shù)資料
| 型號： | R2043T-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | 4-wire Serial Interface |
| 中文描述： | REAL TIME CLOCK, PDSO10 |
| 封裝： | 4 X 2.9 MM, 1 MM HEIGHT, TSSOP-10 |
| 文件頁數(shù)： | 31/48頁 |
| 文件大小： | 458K |
| 代理商： | R2043T-E2 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁當前第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
R2043K/T
O
12345
Rev.2.05 - 31 -
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, R2043K/T varies number of 1-second clock pulses once per 20 seconds. When
DEV bit is set to 1, R2043K/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:
Frequency of clock pulse output from the 32KOUT pin at normal temperature in the manner described
in " P.28
O
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.
When setting DEV bit to 1:
相關PDF資料 |
PDF描述 |
|---|---|
| R2043K | 4-wire Serial Interface |
| R2043K-E2 | 4-wire Serial Interface |
| R3111Q181B | LOW VOLTAGE DETECTOR |
| R3111Q191A | LOW VOLTAGE DETECTOR |
| R3111Q191B | LOW VOLTAGE DETECTOR |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R20440 | 制造商:Microsemi Corporation 功能描述:STD RECOVERY RECTFR 400V 12A 2PIN DO-4 - Bulk |
| R2045D | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:4-wire Serial Interface Real Time Clock Module |
| R2045S | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:4-wire Serial Interface Real Time Clock Module |
| R20460 | 制造商:Microsemi Corporation 功能描述:STD RECOVERY RECTFR 600V 12A 2PIN DO-4 - Bulk |
| R20480 | 制造商:Microsemi Corporation 功能描述:STD RECOVERY RECTFR 800V 12A 2PIN DO-4 - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復。