Key facts
- Brand
- Philips
- Model
- PCA148X
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-07-05
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Philips PCA148x Series 32 kHz Watch Circuits Datasheet
The PCA148x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches with a bipolar stepping motor. The circuit includes a 32 kHz oscillator and provides an output capable of driving various types of bipolar stepping motors.
A key feature is the adaptive motor pulse technology, which reduces motor current consumption by up to 50% through self-adaptation of the motor pulse width based on the required torque. The device also features time calibration via EEPROM, battery end-of-life indication, and a stop function for accurate timing.
Philips PCA148X specifications
| Oscillator frequency | 32 kHz |
|---|---|
| Current consumption | 170 nA (typical) |
| Motor output type | Bipolar stepping motor |
| Motor pulse stages | 6 (stage 1 to 6) |
| Duty factor range | 43.75 % – 75 % |
All Philips PCA148X documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What external component is required to operate the PCA148x circuit?
A quartz crystal is the only external component required for operation.
From: Philips PCA148x Series 32 kHz Watch Circuits Datasheet
How does the circuit indicate that the battery has reached end-of-life?
The waveform is produced in bursts of 4 pulses every 4 seconds to indicate this condition.
From: Philips PCA148x Series 32 kHz Watch Circuits Datasheet
What is the typical current consumption of the PCA148x series?
The IC typically consumes about 170 nA of current.
How many motor pulse stages does the circuit provide?
It provides six motor‑pulse stages, numbered 1 through 6.