PCA2000
Description
The PCA2000 and PCA2001 are CMOS1 integrated circuits for battery operated wrist watches with a 32 kHz quartz crystal as timing element and a bipolar 1 Hz stepping motor.
Key Features
- Amplitude-regulated 32 kHz quartz crystal oscillator, with excellent frequency stability and high immunity to leakage currents
- 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 power consumption, typical 90 nA
- One second output pulses for bipolar stepping motor
- Minimum power consumption for the entire watch, due to self adaptation of the motor drive according to the required torque
- Reliable step detection circuit
- Motor pulse width, pulse modulation, and pulse adaptation range programmable in a wide range, stored in OTP memory
- Stop function for accurate time setting and power saving during shelf life
- The definition of the abbreviations and acronyms used in this data sheet can be found in Section
Applications
- High immunity motor drive circuits
