FEATURES

· 32 kHz oscillator, amplitude regulated with excellent

frequency stability

· High immunity of the oscillator to leakage currents

· Time calibration electrically programmable and

reprogrammable (via EEPROM)

· A quartz crystal is the only external component required

· Very low current consumption; typically 170 nA

· Detector for silver-oxide or lithium battery voltage levels

· Indication for battery end-of-life

· Stop function for accurate timing

· Power-on reset for fast testing

· Various test modes for testing the mechanical parts of

the watch and the IC.

GENERAL DESCRIPTION

The PCA16xx series devices are CMOS integrated circuits

specially suited for battery-operated,

quartz-crystal-controlled wrist-watches, with bipolar

stepping motors.