This datasheet introduces the features of the PCA16xx series 32 kHz quartz crystal controlled watch circuits. The series products are suitable for battery-powered quartz crystal controlled watches with bipolar stepping motors.
The Philips PCA16xx series consists of CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches with bipolar stepping motors. The devices include a 32 kHz oscillator with excellent frequency stability and an internal EEPROM for electrically programmable time calibration. They require only a quartz crystal as an external component and offer very low current consumption, typically 170 nA.
| Oscillator Frequency | 32 kHz |
|---|---|
| Supply Voltage | 1.2 to 2.5 V |
| Typical Supply Current | 170 nA |
| Operating Temperature | -10 to +60 C |
| Storage Temperature | -30 to +100 C |
| Motor Pulse Width | 2 ms to 15.7 ms |
A quartz crystal is the only external component required.
Time calibration is electrically programmable and reprogrammable via the internal EEPROM.
The motor pulse is produced without chopping, and bursts of 4 pulses are produced every 4 seconds to indicate the condition.