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PCA2000U/10AA/1,00 PDF预览

PCA2000U/10AA/1,00

更新时间： 2024-11-09 19:49:11
品牌 Logo 应用领域
恩智浦 - NXP PC
页数 文件大小 规格书
34页 370K
描述
PCA2000; PCA2001 - 32 kHz watch circuit with programmable adaptive motor pulse

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PCA2000U/10AA/1,00 技术参数

Source Url Status Check Date：2013-10-15 00:00:00生命周期：Obsolete
包装说明：DIE-8Reach Compliance Code：unknown
风险等级：5.65Base Number Matches：1

PCA2000U/10AA/1,00 数据手册

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PCA2000; PCA2001  
32 kHz watch circuit with programmable adaptive motor pulse  
Rev. 9 — 24 November 2011  
Product data sheet  
1. General description  
The PCA2000 and PCA2001 are CMOS1 integrated circuits for battery operated wrist  
watches with a 32 kHz quartz crystal as timing element and a bipolar 1 Hz stepping motor.  
The quartz crystal oscillator and the frequency divider are optimized for minimum power  
consumption. A timing accuracy of 1 ppm is achieved with a programmable, digital  
frequency adjustment.  
To obtain the minimum overall power consumption for the watch, an automatic motor  
pulse adaptation function is provided. The circuit supplies only the minimum drive current,  
which is necessary to ensure a correct motor step. Changing the drive current of the  
motor is achieved by chopping the motor pulse with a variable duty cycle. The pulse width  
and the range of the variable duty cycle can be programmed to suit different types of  
motors. The automatic pulse adaptation scheme is based on a safe dynamic detection of  
successful motor steps.  
A pad RESET is provided (used for stopping the motor) for accurate time setting and for  
accelerated testing of the watch.  
The PCA2000 has a battery End Of Life (EOL) warning function. If the battery voltage  
drops below the EOL threshold voltage (which can be programmed for silver oxide or  
lithium batteries), the motor steps change from one pulse per second to a burst of four  
pulses every 4 seconds.  
The PCA2001 uses the same circuit as the PCA2000, but without the EOL function.  
2. Features and benefits  
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 connected  
Very low power consumption, typical 90 nA  
One second output pulses for bipolar stepping motor  
Minimum power consumption for the entire watch, due to self adaptation of the motor  
drive according to the required torque  
Reliable step detection circuit  
Motor pulse width, pulse modulation, and pulse adaptation range programmable in a  
wide range, stored in OTP memory  
Stop function for accurate time setting and power saving during shelf life  
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 15.  
 
 
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