PCA2002 datasheet(4/20 Pages) PHILIPS

4 / 20 page

2004 Jan 20

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuit with programmable

output period and pulse width

PCA2002

handbook, halfpage

MBL569

PCA2002T

VSS

i.c.

OSCIN

OSCOUT

RESET

MOT2

MOT1

VDD

Fig.2 Pin configuration PMFP8.

001aaa284

PCA2002TK

RESET

i.c.

VSS

MOT2

OSCIN

MOT1

OSCOUT

VDD

n.c.

terminal 1

index area

Fig.3 Pin configuration HVSON10.

Bottom view

FUNCTIONAL DESCRIPTION

Motor pulse

The motor driver delivers pulses with an alternating

polarity. The output waveform across the motor terminals

is illustrated in Fig.4. Between the motor pulses, both

terminals are connected to VDD which means that the

motor is short-circuited.

The following parameters can be selected and are stored

in a One Time Programmable (OTP) memory:

• Output periods of 1 s, 5 s, 10 s, 20 s and 30 s

• Pulse width (tp) between 0.98 ms and 7.8 ms in steps of

0.98 ms

• Full or chopped (75 %) output pulse

• Pulse stretching: an enlargement pulse is added to the

primary motor pulse. This enlargement pulse has a duty

cycle of 25 % and a width which is twice the

programmed motor pulse width.

handbook, full pagewidth

full pulse

MGU718

chopped

pulse

full pulse

with stretching

chopped pulse

with stretching

period

2tp

Fig.4 Motor output waveforms.

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