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PCA1487 - CMOS

Description

chip with bumps on tape chip with bumps on tape chip on foil chip on foil GENERAL DESCRIPTION PCA148x series No loss of motor steps possible because of on-chip detection of the induced motor voltage Indication for battery end-of-life Stop function for accurate timing

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 circuit.

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INTEGRATED CIRCUITS DATA SHEET PCA148x series 32 kHz watch circuits with adaptive motor pulse Product specification Supersedes data of 1998 Mar 26 File under Integrated Circuits, IC16 1998 Apr 21 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse 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 in accorda
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