DESCRIPTION

· The PCA2002 is a CMOS integrated circuit designed for battery-operated wrist watches, utilizing a 32 kHz quartz crystal and a bipolar stepping motor.

· It features a quartz crystal oscillator and frequency divider optimized for minimal current consumption, achieving a timing accuracy of 1 ppm with digital frequency adjustment.

· The circuit allows programming of output period and pulse width, with options for full or chopped output pulses and additional pulse stretching.

· Includes a RESET pad for precise time setting and accelerated watch testing.

FEATURES

· Amplitude-regulated 32 kHz quartz crystal oscillator with high frequency stability and leakage current immunity.

· Electrically programmable time calibration with 1 ppm resolution, stored in OTP memory.

· Requires only a quartz crystal as an external component.

· Very low current consumption, typically 90 nA.

· Output pulses for bipolar stepping motors with five programmable output periods and pulse width between 1 ms and 8 ms.

· Selectable full or chopped motor pulse with pulse stretching.

· Stop function for accurate time setting and current saving.

· Test mode for accelerated mechanical parts testing and test bits for type recognition.

APPLICATIONS

· Driver circuits for bipolar stepping motors.

· Motor drive circuits with high immunity.

· Suitable for high production volumes in watch manufacturing.