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Company Logo NXP Semiconductors

  • Time Calibration Circuit

  • Created: Sep 03, 2014

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Calibration is the process of modifying an instrument to provide a result for a sample within an acceptable range. It can be one of known magnitude, correctness made, set with one device or with another measurement made in a similar way as possible with a second device. The device with the known or assigned correctness is called the standard. The second device is the unit under test, test instrument, or any of several other names for the device being calibrated.

The PCA146x series devices are CMOS integrated circuits especially suited for battery-operated, quartz-crystal-controlled wristwatches, with a bipolar stepping motor. The motor output delivers pulses of six different stages depending on the torque required to turn the motor. Every motor pulse is followed by a detection phase, which monitors the waveform of the induced motor voltage. When a step is missed, a correction sequence will be started.

The accuracy of electronic components used in all instruments naturally drifts over time. Therefore, it is necessary to calibrate instruments at regular intervals as defined by the manufacturer. Calibration quantifies and improves the measurement performance of an instrument. Benefits of maintaining properly calibrated equipment include reduced measurement errors, consistency between measurements, increased production yields, and the assurance of accurate measurements.



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