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PCA2002T Datasheet(PDF) 2 Page - NXP Semiconductors |
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PCA2002T Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 20 page 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 |
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