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PCA2002 Datasheet(PDF) 4 Page - NXP Semiconductors |
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PCA2002 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 20 page 2004 Jan 20 4 Philips Semiconductors Product specification 32 kHz watch circuit with programmable output period and pulse width PCA2002 handbook, halfpage MBL569 PCA2002T 1 2 3 4 VSS i.c. OSCIN OSCOUT RESET MOT2 MOT1 VDD 8 7 6 5 Fig.2 Pin configuration PMFP8. 001aaa284 PCA2002TK RESET i.c. VSS MOT2 OSCIN MOT1 OSCOUT VDD n.c. n.c. 1 10 2 9 3 8 4 7 5 6 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 tp 2tp tp 2tp Fig.4 Motor output waveforms. |
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