This document describes the PCA16xx series of 32 kHz watch circuits with EEPROM. The product features a 32 kHz oscillator with excellent immunity to leakage currents, electrically programmable and reprogrammable time calibration via EEPROM, and only requires an external quartz crystal.
The Philips PCA16xx series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches with bipolar stepping motors. The series includes various types (PCA1601 through PCA1629) available in different delivery formats such as chip on foil, plastic micro flat package, and chip with bumps on tape.
Key features include a 32 kHz oscillator with amplitude regulation, high immunity to leakage currents, and electrically programmable time calibration via EEPROM. The circuits support both silver-oxide and lithium battery voltage levels, with a detector for battery end-of-life indication. Typical current consumption is very low, around 170 nA.
| Oscillator Frequency | 32 kHz |
|---|---|
| Typical Supply Current | 170 nA |
| Operating Ambient Temperature | -10 to +60 °C |
| Supply Voltage Range | 1.2 to 2.5 V |
| Motor Pulse Width | 2 ms to 15.7 ms |
| EEPROM Reprogramming Limit | 100 times |
A quartz crystal is the only external component required.
Time calibration is electrically programmable and reprogrammable via EEPROM by varying the supply voltage to program a specific number of inhibited pulses.
The circuits support silver-oxide or lithium battery voltage levels, with a detector for battery end-of-life.