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PCF2003 - CMOS

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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.

Overview

PCF2003 32 kHz watch circuit with programmable adaptive motor pulse and pulse period Rev.

1.1 — 16 October 2019 Product data sheet 1.

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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