NXP USA Inc. PCA2003U/10AC/1,00

Description
The PCA2003 is a CMOS integrated circuit designed for battery-operated wristwatches. It utilizes a 32 kHz quartz crystal as the timing element and drives a bipolar 1 Hz stepping motor. The quartz crystal oscillator and frequency divider are optimized for minimal power consumption, achieving a timing accuracy of 1 ppm through programmable digital frequency adjustment.

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
Minimal external components (only the quartz crystal)
Ultra-low supply current (typically 90 nA)
One-second output pulses for bipolar stepping motor
Five programmable output periods (1 s to 30 s)
Automatic motor pulse adaptation for optimal power consumption
Reliable step detection circuit
Programmable motor pulse width, pulse modulation, and pulse adaptation range
Stop function for accurate time setting and power saving
Test mode for accelerated testing

Applications
The PCA2003 is specifically designed for battery-operated wristwatches, providing accurate timekeeping with minimal power consumption.