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參數(shù)資料
| 型號： | M41T11MH6F |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Serial Real Time Clock with 56 Bytes of NVRAM |
| 中文描述： | 串行實(shí)時(shí)時(shí)鐘與56字節(jié)的NVRAM |
| 文件頁數(shù)： | 16/29頁 |
| 文件大?。?/td> | 154K |
| 代理商： | M41T11MH6F |
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Clock operation
M41T11
16/29
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 M41T11 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.
3.2
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.
3.3
Preferred initial 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.
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