Philips PCA146X Manuals

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.

This document describes the features and characteristics of the PCA146x series 32 kHz watch circuits, including frequency stability, high immunity of the oscillator to leakage currents, time calibration that is electrically programmable and reprogrammable via EEPROM, low current consumption with only a quartz crystal as the external component, output for different types of bipolar stepping motors, up to 50% reduction in motor current compared to conventional circuits by adapting the motor pulse width to match the required torque, on-chip detection of induced motor voltage to prevent loss of motor steps, detector for lithium or silver-oxide battery voltage levels, indication for battery end-of-life, stop function for accurate timing, power-on reset for fast testing, and various test modes for testing the mechanical parts of the watch and the IC.