アプリケーション・ノート (3)
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ESD and EMC sensitivity of IC[AN10853]
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Handling bare die[AN10706]
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32 KHz Watch Circuit with Programmable Output Period and Pulse Width
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 quartz 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.
A pad RESET is provided (used for stopping the motor) for accurate time setting and for accelerated testing of the watch.
製品詳細
ブロック図
Features
- Amplitude-regulated 32 kHz quartz crystal oscillator, with excellent frequency stability and high immunity to leakage currents
- Electrically programmable time calibration with 1 ppm resolution stored in One Time Programmable (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 shelf life
- Test mode for accelerated testing of the mechanical parts of the watch
- Test bits for type recognition
Target Applications
- Driver circuits for bipolar stepping motors
- High immunity motor drive circuits
- High production volumes
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ドキュメント
クイック・リファレンス ドキュメンテーションの種類.
4 ドキュメント
コンパクトリスト
4 ドキュメント
コンパクトリスト
アプリケーション・ノート (3)
-
ESD and EMC sensitivity of IC[AN10853]
-
Handling bare die[AN10706]
データ・シート (1)
設計・リソース