PCA2002 Datasheet, PDF(4/20 Page) NXP Semiconductors – 32 kHz watch circuit with programmable output period and pulse width

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PCA2002 Datasheet, PDF (4/20 Pages) NXP Semiconductors – 32 kHz watch circuit with programmable output period and pulse width

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Philips Semiconductors

32 kHz watch circuit with programmable

output period and pulse width

Product speciï¬cation

PCA2002

handbook, halfpage

VSS 1

8 RESET

i.c. 2

7 MOT2

PCA2002T

OSCIN 3

6 MOT1

OSCOUT 4

5 VDD

MBL569

n.c. 5

OSCOUT 4

OSCIN 3

i.c. 2

VSS 1

PCA2002TK

6 n.c.

7 VDD

8 MOT1

9 MOT2

10 RESET

terminal 1

index area

001aaa284

Bottom view

Fig.2 Pin configuration PMFP8.

Fig.3 Pin configuration HVSON10.

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:

â¢ Output periods of 1 s, 5 s, 10 s, 20 s and 30 s

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

0.98 ms

â¢ Full or chopped (75 %) output pulse

â¢ 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

chopped

pulse

full pulse

with stretching

chopped pulse

with stretching

2004 Jan 20

period

2tp

Fig.4 Motor output waveforms.

MGU718

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