PCA2002TK/1,118

Overview

The PCA2002TK/1,118 is a CMOS integrated circuit designed for battery-operated wrist watches, utilizing a 32 kHz quartz crystal and bipolar stepping motor. It features an amplitude-regulated oscillator with excellent frequency stability and high immunity to leakage currents. The device offers electrically programmable time calibration via One Time Programmable (OTP) memory, achieving 1 ppm resolution. Key electrical parameters include a typical supply current of 90 nA between motor pulses, a supply voltage range of 1.1 V to 3.6 V, and output pulse widths programmable from 1 ms to 8 ms. It supports five output periods ranging from 1 s to 30 s.

Feature Summary

• Amplitude-regulated 32 kHz quartz crystal oscillator with integrated 5.2 pF load capacitance
• Electrically programmable time calibration stored in OTP memory with 1 ppm resolution
• Very low current consumption: typically 90 nA between motor pulses
• Programmable output periods (1 s, 5 s, 10 s, 20 s, 30 s) and pulse widths (1 ms to 8 ms)

Applications

• Driver circuits for bipolar stepping motors in wrist watches
• High immunity motor drive circuits for precision timekeeping
• Battery-operated watch assemblies requiring low power consumption

Procurement Notes

Verify the package type against the specific suffix; the provided local data indicates a 10-HVSON package, while the official datasheet lists WLCSP8 or bare die options. Confirm OTP programming requirements and supply voltage modulation specifications during production testing. Ensure compatibility with the 32 kHz quartz crystal's specified load capacitance of 8.2 pF, noting the internal 5.2 pF integration.

Selection Notes

Select this component for applications requiring minimal external components, as only the quartz crystal is needed. Consider the OTP programming complexity involving supply voltage modulation for calibration. Evaluate the 90 nA standby current against battery life requirements. Ensure the design accommodates the reset function for accurate time setting and test mode activation via the RESET pin.

Part Context

The PCA2002 belongs to the PCA200x family of watch circuits from NXP Semiconductors. It is part of a series including variants like PCA2000, PCA2001, and PCA2003, distinguished by type recognition bits in the OTP memory. The device is optimized for high production volumes and offers flexibility through programmable output parameters stored in non-volatile memory.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify functional equivalence regarding OTP programming sequences, oscillator characteristics, and motor driver capabilities if considering alternative watch circuits.