PCA1462U/F2,026

PCA146X - 带有自适应电机脉冲的32 kHz表电路

Overview

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.**

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## 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.

## Features