1998 Apr 21

2

Philips Semiconductors

Product specification

32 kHz watch circuits with adaptive motor

pulse

PCA146x series

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

• Output for bipolar stepping motors of different types

• Up to 50% reduction in motor current compared with

conventional circuits, by self adaption of the motor pulse

width to match the required torque of the motor

• No loss of motor steps possible because of on-chip

detection of the induced motor voltage

• 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

• Various test modes for testing the mechanical parts of

the watch and the IC.

GENERAL DESCRIPTION

The PCA146x series devices are CMOS integrated circuits

specially suited for battery-operated,

quartz-crystal-controlled wrist-watches, with a bipolar

stepping motor.

ORDERING INFORMATION

Note

1. Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only.

Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats.

TYPE

NUMBER

NAME

DESCRIPTION

VERSION

PCA1461U

−

chip in tray

−

PCA1461U/10

−

chip on foil

−

PCA1462U

−

chip in tray

−

PCA1462U/7

−

chip with bumps on tape

−

PCA1462U/10

−

chip on foil

−

PCA1463U

−

chip in tray

−

PCA1463U/10

−

chip on foil

−

PCA1465U/10

−

chip on foil

−

PCA1465U/7

−

chip with bumps on tape

−

PCA1467U/10

−

chip on foil

−