PCA2003U/10AC/1Z

Overview

The PCA2003U/10AC/1Z is a CMOS integrated circuit designed for battery-operated wrist watches, utilizing a 32 kHz quartz crystal as the timing element and driving a bipolar 1 Hz stepping motor. It features an amplitude-regulated oscillator with excellent frequency stability and high immunity to leakage currents. The device achieves a typical supply current of 90 nA and includes electrically programmable time calibration with 1 ppm resolution stored in One Time Programmable (OTP) memory. Key functional blocks include a voltage detector, OTP controller, motor control with adaptive pulse modulation, step detection, and timing adjustment circuits.

Feature Summary

• Amplitude-regulated 32 kHz quartz crystal oscillator with high immunity to leakage currents
• Electrically programmable time calibration with 1 ppm resolution stored in OTP memory
• Very low supply current, typically 90 nA
• Automatic motor pulse adaptation function for minimum power consumption based on required torque

Applications

• Driver circuits for bipolar stepping motors
• High immunity motor drive circuits

Procurement Notes

Verify that the ordering suffix /1Z corresponds to the wire bond die packaged in a 7-inch tape reel DP format. Confirm the ambient temperature range is -10 °C to +60 °C. Ensure handling procedures for bare die are followed according to NXP guidelines.

Selection Notes

Select this component when designing battery-operated analog watches requiring precise timekeeping with minimal power consumption. The programmable adaptive motor pulse feature allows optimization for different motor types by adjusting duty cycles and driving stages via OTP programming.

Part Context

This part belongs to the PCA200x series of watch circuits from NXP Semiconductors. It is specifically identified as a wire bond die variant intended for surface mount assembly in compact wearable devices.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.