- 您現在的位置：買賣IC網 > PDF目錄45049 > M41T00M6 (STMICROELECTRONICS) 0 TIMER(S), REAL TIME CLOCK, PDSO8 PDF資料下載
參數資料
| 型號： | M41T00M6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數據恢復及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數： | 8/25頁 |
| 文件大?。?/td> | 205K |
| 代理商： | M41T00M6 |
M41T00 clock operation
M41T00
16/25
within a 64minute cycle. The first 62 minutes in the cycle may, once per minute, have one
second either shortened by 128 or lengthened by 256 oscillator cycles. If a binary '1' is
loaded into the register, only the first 2 minutes in the 64 minute cycle will be modified; if a
binary 6 is loaded, the first 12 will be affected, and so on.
Therefore, each calibration step has the effect of adding 512 or subtracting 256 oscillator
cycles for every 125,829,120 actual oscillator cycles, that is +4.068 or –2.034 ppm of
adjustment per calibration step in the calibration register. Assuming that the oscillator is in
fact running at exactly 32,768Hz, each of the 31 increments in the calibration byte would
represent +10.7 or –5.35 seconds per month which corresponds to a total range of +5.5 or –
2.75 minutes per month.
Two methods are available for ascertaining how much calibration a given M41T00 may
require. The first involves simply setting the clock, letting it run for a month and comparing it
to a known accurate reference (like WWV broadcasts). While that may seem crude, it allows
the designer to give the end user the ability to calibrate his clock as his environment may
require, even after the final product is packaged in a non-user serviceable enclosure. All the
designer has to do is provide a simple utility that accessed the calibration byte.
The second approach is better suited to a manufacturing environment, and involves the use
of some test equipment. When the Frequency Test (FT) Bit, the seventh-most significant bit
in the Control Register, is set to a '1', and the oscillator is running at 32,768Hz, the FT/OUT
pin of the device will toggle at 512Hz. Any deviation from 512Hz indicates the degree and
direction of oscillator frequency shift at the test temperature.
For example, a reading of 512.01024Hz would indicate a +20 ppm oscillator frequency error,
requiring a –10(XX001010) to be loaded into the calibration byte for correction. Note that
setting or changing the calibration byte does not affect the frequency test output frequency.
Figure 12. Crystal accuracy across temperature
AI00999b
–160
0
10203040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
F
= K x (T –TO)
2
K = –0.036 ppm/
°C2 ± 0.006 ppm/°C2
TO = 25°C ± 5°C
F
相關PDF資料 |
PDF描述 |
|---|---|
| M41T0DS6 | REAL TIME CLOCK, PDSO8 |
| M41T0DS6T | REAL TIME CLOCK, PDSO8 |
| M41T0M6T | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T0M6TR | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T11MH6E | REAL TIME CLOCK, PDSO28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| M41T00M6E | 功能描述:實時時鐘 Serial 64 (8X8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T00M6F | 功能描述:實時時鐘 Serial 64 (8X8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T00M6F-CUT TAPE | 制造商:ST 功能描述:M41T00 Series 2 - 5.5 V 32 kHz Serial I2C Real Time Clock - SOIC-8 |
| M41T00S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock |
| M41T00S_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock |
發(fā)布緊急采購，3分鐘左右您將得到回復。