32 KHz Watch Circuits with Adaptive Motor Pulse

PCA1462U

The PCA146x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor.

PCA1462U should not be used for new designs.

Product Details

Select a section:

Block Diagram

PCA1462U, PCA1463U Block Diagram

PCA1462U, PCA1463U Block Diagram
Get diagram PDF

Features

  • 32 kHz oscillator, amplitude regulated with excellent frequency stability
  • High immunity of the oscillator to leakage currents
  • Time calibration electrically programmable and reprogrammable (via EEPROM)
  • A quartz crystal is the only external component required
  • Very low current consumption; typically 170 nA
  • Output for bipolar stepping motors of different types
  • Up to 50% reduction in motor current compared with conventional circuits, by self adaption of the motor pulse width to match the required torque of the motor
  • No loss of motor steps possible because of on-chip detection of the induced motor Voltage
  • Detector for lithium or silver-oxide battery Voltage levels
  • Indication for battery end-of-life
  • Stop function for accurate timing
  • Power-on reset for fast testing
  • Various test modes for testing the mechanical parts of the watch and the IC.

Target Applications

  • Digital fibre optic receiver in short, medium and long haul optical telecommunications transmission systems or in high speed data networks
  • Wideband RF gain block.

Documentation

Quick reference to our documentation types.

Filters

3 documents

Design Resources

Select a section:

Engineering Services

1 engineering service

To find a complete list of our partners that support this product, please see our Partner Marketplace.

Support

What do you need help with?

Search