PCA2000; PCA2001 32 kHz watch circuit with programmable adaptive motor pulse Rev.
9 — 24 November 2011 Product data sheet 1.
General description The PCA2000 and PCA2001 are CMOS1 integrated circuits for battery operated wrist watches with a 32 kHz quartz crystal as timing element and a bipolar 1 Hz stepping motor.
The quartz crystal oscillator and the frequency divider are optimized for minimum power consumption.
A timing accuracy of 1 ppm is achieved with a programmable, digital frequency adjustment.
To obtain the minimum overall power consumption for the watch, an automatic motor pulse adaptation function is provided.
The circuit supplies only the minimum drive current, which is necess...

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