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PCA1485 Datasheet CMOS

Manufacturer: NXP Semiconductors

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General 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 • Power-on reset for fast testing • Various test modes for testing the mechanical parts of the watch and the IC.

The PCA148x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor.

VERSION − − − − 1.

Overview

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.

Key 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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