32 KHz Watch Circuit with Programmable Adaptive Motor Pulse

Product Details

Block Diagram

Choose a diagram:

PCA2000/2001 Block Diagram

PCA2000/2001 Block Diagram

Block diagram: PCA2000CX8, PCA2000U, PCA2001CX8, PCA2001U


  • 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 power consumption, typical 90 nA
  • One second output pulses for bipolar stepping motor
  • 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
  • End Of Life (EOL) indication for silver oxide or lithium battery (only the PCA2000 has the EOL feature)
  • 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

Part numbers include: PCA2001U, PCA2000U.


Quick reference to our documentation types.

4 documents

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