PCA2001CX8/5/1,025

Overview

The PCA2001CX8/5/1,025 is a CMOS integrated circuit designed for battery-operated wrist watches. It utilizes a 32 kHz quartz crystal as the timing element and drives a bipolar 1 Hz stepping motor. The device features an amplitude-regulated oscillator with excellent frequency stability and high immunity to leakage currents. It achieves a timing accuracy of 1 ppm through programmable digital frequency adjustment stored in One Time Programmable (OTP) memory. The typical supply current is 90 nA at VDD = 1.55 V. Unlike the PCA2000, this variant lacks the End Of Life (EOL) warning function.

Feature Summary

• Amplitude-regulated 32 kHz quartz crystal oscillator with integrated capacitance of 5.2 pF
• Electrically programmable time calibration with 1 ppm resolution stored in OTP memory
• Adaptive motor pulse modulation for minimum power consumption based on required torque
• Reliable step detection circuit with programmable correction sequences for missed steps

Applications

• Driver circuits for bipolar stepping motors
• High immunity motor drive circuits
• Battery operated wrist watches

Procurement Notes

Verify the specific ordering suffix /5/1,025 against the manufacturer's official documentation to confirm the delivery form and packaging details. The datasheet lists PCA2001CX8/5/1 as an unsawn wafer with lead-free solder bumps in a WLCSP8 package. Ensure compatibility with the intended assembly process for wafer-level chip-size packages.

Selection Notes

Select the PCA2001 over the PCA2000 if the application does not require the battery End Of Life (EOL) indication feature. The PCA2001 provides identical timing accuracy, adaptive motor drive, and OTP programming capabilities. Consider the 8-WLCSP package dimensions (1.16x0.86 mm) for space-constrained watch designs.

Part Context

This component belongs to the PCA2000/PCA2001 family of 32 kHz watch circuits. The PCA2001 is functionally identical to the PCA2000 but omits the EOL voltage detector and associated motor burst output. Both devices share the same OTP programming interface and adaptive motor control logic, differing only in the presence or absence of the low-battery warning functionality.

Replacement Considerations

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