2004 Jan 20

2

Philips Semiconductors

Product specification

32 kHz watch circuit with programmable

output period and pulse width

PCA2002

FEATURES

• 32 kHz quartz oscillator, amplitude regulated with

excellent frequency stability and high immunity to

leakage currents

• Electrically programmable time calibration with 1 ppm

resolution (stored in OTP memory)

• The quartz crystal is the only external component

required

• Very low current consumption: typically 90 nA

• Output pulses for bipolar stepping motors

• Five different programmable output periods (1 s to 30 s)

• Output pulse width programmable between

1 ms and 8 ms

• Full or chopped motor pulse and pulse stretching,

selectable

• Stop function for accurate time setting and current

saving during the shelf life

• Test mode for accelerated testing of the mechanical

parts of the watch.

GENERAL DESCRIPTION

The PCA2002 is a CMOS integrated circuit for battery

operated wrist watches with a 32 kHz quartz crystal as the

timing element and a bipolar stepping motor. The crystal

oscillator and the frequency divider are optimized for

minimum current consumption. A timing accuracy of

1 ppm is achieved with a programmable, digital frequency

adjustment.

The output period and the output pulse width can be

programmed. It can be selected between a full output

pulse or a chopped output pulse with a duty cycle of 75 %.

In addition, a stretching pulse can be added to the primary

driving pulse.

Pin RESET is used for stopping the motor, accurate time

setting and for an accelerated testing of the watch.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCA2002U/AA

−

bare die; chip in tray

−

PCA2002U/10AA

−

bare die; chip on film frame carrier

−

PCA2002T

PMFP8

plastic micro flat package; 8 leads (straight)

SOT144-1

PCA2002TK

HVSON10

plastic thermal enhanced very thin small outline package;

no leads; 10 terminals; body 3

× 3 × 0.85 mm

SOT650-1