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参数资料
| 型号： | M41T11MH6F |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, LEAD FREE, PLASTIC, SOH-28 |
| 文件页数： | 8/30页 |
| 文件大小： | 250K |
| 代理商： | M41T11MH6F |
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Clock operation
M41T11
adjustment per calibration step in the calibration register. Assuming that the oscillator is in
fact running at exactly 32,768 Hz, 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 32,768 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 frequency shift at the test temperature.
For example, a reading of 512.01024 Hz 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T11MH6F-CUT TAPE | 制造商:ST 功能描述:M41T11 Series 2 to 5.5 V Serial I2C Real Time Clock Surface Mount - SOH-28 |
| M41T11MH6TR | 制造商:STMicroelectronics 功能描述:REAL TIME CLOCK SERL 64BYTE 28PIN SOH - Tape and Reel |
| M41T11SH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:512 bit 64b x8 Serial Access TIMEKEEPER SRAM |
| M41T256Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC |
| M41T256Y_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256Kbit (32K x 8) serial RTC |
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