PCA2001U/10AC/1,00

Overview

The PCA2001U/10AC/1 is a CMOS integrated circuit designed for battery-operated wrist watches, utilizing a 32 kHz quartz crystal as the timing element. It features an amplitude-regulated oscillator with excellent frequency stability and high immunity to leakage currents. The device includes a programmable digital frequency adjustment achieving 1 ppm accuracy, stored in One Time Programmable (OTP) memory. Typical power consumption is 90 nA between motor pulses. Unlike the PCA2000, this variant lacks the End Of Life (EOL) warning function. It provides one-second output pulses for bipolar stepping motors with adaptive drive current based on required torque.

Feature Summary

• Amplitude-regulated 32 kHz quartz crystal oscillator with 1 ppm programmable time calibration via OTP memory
• Very low power consumption, typically 90 nA between motor pulses
• Adaptive motor pulse modulation for minimum power consumption based on required torque
• Reliable step detection circuit with programmable pulse width and duty cycle

Applications

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

Procurement Notes

Verify that the specific order requires the PCA2001 variant without the EOL function, as the PCA2000 includes this feature. Confirm the sawn wafer on Film Frame Carrier (FFC) delivery form matches the assembly line requirements. Ensure programming equipment supports the specified voltage modulation parameters for OTP writing.

Selection Notes

Select the PCA2001 when the End Of Life indication is not required for the application. The device supports programmable pulse widths from 0.98 ms to 7.8 ms and duty cycles from 37.5% to 56.25%. Consider the integrated load capacitance of 5.2 pF when selecting the external quartz crystal, which typically requires a CL of 8.2 pF.

Part Context

This component belongs to the PCA200x family of watch circuits manufactured by NXP Semiconductors. It is functionally identical to the PCA2000 except for the absence of the battery End Of Life warning feature. The part is available in wire bond die and WLCSP8 package formats, with the /10AC/1 suffix indicating a sawn wafer on Film Frame Carrier delivery.

Replacement Considerations

The PCA2000U/10AC/1 is a direct functional substitute if the End Of Life warning feature is acceptable or unused. Other PCA200x family members may require verification of pin compatibility and OTP programming procedures.