PCF2003 Overview
The PCF2003 is a CMOS integrated circuit for battery operated wrist watches with a 32 kHz quartz crystal as timing element and a bipolar 1 Hz stepping motor. The quartz crystal oscillator and the frequency divider are optimized for minimum power consumption. A timing accuracy of 1 ppm is achieved with a programmable, digital frequency adjustment.
PCF2003 Key Features
- Amplitude-regulated 32 kHz quartz crystal oscillator, with excellent frequency stability and high immunity to leakage cu
- Electrically programmable time calibration with 1 ppm resolution stored in One Time Programmable (OTP) memory
- The quartz crystal is the only external ponent connected
- Very low supply current, typical 90 nA
- One second output pulses for bipolar stepping motor
- Five different programmable output periods (1 s to 30 s)
- Minimum power consumption for the entire watch, due to self adaptation of the motor
- Reliable step detection circuit
- Motor pulse width, pulse modulation, and pulse adaptation range programmable in a
- Stop function for accurate time setting and power saving during shelf life
PCF2003 Applications
- Driver circuits for bipolar stepping motors