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參數(shù)資料
| 型號： | M41T00 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大小： | 96K |
| 代理商： | M41T00 |
CLOCK CALIBRATION (cont’d)
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 environ-
ment 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 manu-
facturing 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 32,768 Hz, the FT/OUT pin of the device
will toggle at 512 Hz. Any deviation from 512 Hz
indicates the degree and direction of oscillator fre-
quency shift at the test temperature.
For example, a reading of 512.01024 Hz would
indicate a +20 ppm oscillator frequency error, re-
quiring 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.
OUTPUT DRIVER PIN
When the FT bit is not set, the FT/OUT pin becomes
an output driver that reflects the contents of D7 of
the control register. In other words, when D6 of
location 7 is a zero and D7 of location 7 is a zero
and then the FT/OUT pin will be driven low.
Note: The FT/OUT pin is open drain which requires
an external pull-up resistor.
POWER-ON DEFAULTS
Upon initial application of power to the device, the
FT bit will be set to a ’0’ and the OUT bit will be set
to a ’1’. All other Register bits will initially power-on
in a random state.
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Figure 13. Clock Calibration
11/15
M41T00
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T00_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock |
| M41T00AUD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock with audio |
| M41T00AUD_12 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock (RTC) with audio |
| M41T00AUDD1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock with audio |
| M41T00AUDD1F | 功能描述:實時時鐘 SERIAL RTC W/AUDIO 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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