32 KHz Watch Circuit with Programmable Adaptive Motor Pulse and Pulse Period

PCA2003U

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Block Diagram

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PCA2003 -BD

PCA2003 Block Diagram

Block diagram: PCA2003U

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 consumption for the entire watch, due to self adaptation of the motor drive according to the required torque
  • Reliable step detection circuit
  • Motor pulse width, pulse modulation, and pulse adaptation range programmable in a wide range, stored in OTP memory
  • Stop function for accurate time setting and power saving during shelf life
  • Test mode for accelerated testing of the mechanical parts of the watch and the IC
  • Test bits for type recognition

Target Applications

  • Driver circuits for bipolar stepping motors
  • High immunity motor drive circuits

Design Resources

Documentation

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4 documents

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