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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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M41T82 Fiches technique(PDF) 49 Page - STMicroelectronics |
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M41T82 Fiches technique(HTML) 49 Page - STMicroelectronics |
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49 / 64 page  DocID012578 Rev 19 49/64 M41T82, M41T83 Clock operation 3.17 OTP bit operation (M41T83 in SOX18 package only) Using the factory-supplied analog calibration value When the OTP (one time programmable) bit is set to a 1, the factory calibration value in the internal OTP register will be transferred to the analog calibration register (12h) and is “read only.” The OTP value is programmed by the manufacturer, and will contain the value necessary to achieve typically ±5 ppm (a) at room temperature (VCC only) after two SMT reflows. This clock accuracy can then be guaranteed to drift no more than ±3 ppm the first year, and ±1 ppm for each following year due to crystal aging. If the OTP bit is set to 0, the analog calibration register will become a WRITE/READ register and function like an ordinary register, allowing the user to implement any desired value of analog calibration. When the user sets the OTP bit, they must wait for approximately 8 ms while the device transfers the OTP value into the analog calibration register. a. Max. value = +12 ppm / –5 ppm based on limited data |
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