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PCA2002 - CMOS

Description

The PCA2002 is a CMOS1 integrated circuit for battery operated wrist watches with a 32 kHz quartz crystal as the timing element and a bipolar stepping motor.

The quartz crystal oscillator and the frequency divider are optimized for minimum current consumption.

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 required.
  • Very low current consumption: typically 90 nA.
  • Output pulses for bipolar stepping motors.
  • Five different programmable output periods (1 s to 30 s).
  • Output pulse widt.

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Full PDF Text Transcription

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PCA2002 32 kHz watch circuit with programmable output period and pulse width Rev. 9 — 6 December 2019 Product data sheet 1. General description The PCA2002 is a CMOS1 integrated circuit for battery operated wrist watches with a 32 kHz quartz crystal as the timing element and a bipolar stepping motor. The quartz crystal oscillator and the frequency divider are optimized for minimum current consumption. A timing accuracy of 1 ppm is achieved with a programmable, digital frequency adjustment. The output period and the output pulse width can be programmed. It can be selected between a full output pulse or a chopped output pulse with a duty cycle of 75 %. In addition, a stretching pulse can be added to the primary driving pulse.
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