PCA2002U 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
产品特点 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
|
应用
- Driver circuits for bipolar stepping motors
- High immunity motor drive circuits
- High production volumes
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封装
| 型号 |
可订购的器件编号 |
订购码 (12NC) |
产品状态 |
封装 |
| PCA2002U/10AB/1 |
9352 781 68005 |
PCA2002U/10AB/1,00 |
量产 |
|
| PCA2002U/AB/1 |
9352 781 65026 |
PCA2002U/AB/1,026 |
量产 |
|
订货和供应
| 型号 |
订购码 (12NC) |
可订购的器件编号 |
化学成分 |
| PCA2002U/10AB/1 |
9352 781 68005 |
PCA2002U/10AB/1,00 |
PCA2002U/10AB/1 |
| PCA2002U/AB/1 |
9352 781 65026 |
PCA2002U/AB/1,026 |
PCA2002U/AB/1 |
PCA2002U 技术支持
| 档案名称 |
标题 |
类型 |
格式 |
| PCA2002U |
32 kHz watch circuit with programmable output period and pulse width |
Data sheet |
pdf |
| AN10706 |
Handling bare die
|
Application note |
pdf |
| AN10853 |
ESD and EMC sensitivity of IC
|
Application note |
pdf |
| UM10569 |
Store and transport requirements
|
User manual |
pdf |
