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PCF2003 - CMOS

General Description

The PCF2003 is a CMOS integrated circuit 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.

Key Features

  • Amplitude-regulated 32 kHz quartz crystal oscillator, with excellent frequency stability and high immunity to leakage currents.
  • Electrically programmable time calibration with 1 ppm resolution stored in One Time Programmable (OTP) memory.
  • The quartz crystal is the only external component connected.
  • Very low supply current, typical 90 nA.
  • One second output pulses for bipolar stepping motor.
  • Five different programmable output periods (1 s to 30 s).
  • Minimum power.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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PCF2003 32 kHz watch circuit with programmable adaptive motor pulse and pulse period Rev. 1.1 — 16 October 2019 Product data sheet 1. General description The PCF2003 is a CMOS integrated circuit 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 necessary to ensure a correct motor step.