This document describes the PCA146x series of 32 kHz watch circuits with adaptive motor pulse. The product features stable frequency, high immunity to interference, programmable time calibration, low power consumption, etc.
The PCA146x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches with a bipolar stepping motor. They feature a 32 kHz oscillator with excellent frequency stability and high immunity to leakage currents. A key feature is the adaptive motor pulse width, which reduces motor current consumption by up to 50% by matching the pulse width to the required torque of the motor.
| Oscillator Frequency | 32 kHz |
|---|---|
| Current Consumption | Typically 170 nA |
| Motor Current Reduction | Up to 50% |
| External Components | Quartz crystal only |
| Motor Type | Bipolar stepping motor |
Only a quartz crystal is required as an external component.
It reduces motor current by up to 50% by adapting the motor pulse width to match the required torque.
It monitors the waveform of the induced motor voltage during a detection phase after each pulse.