Datasheet > PCF2003DUS

PCF2003DUS

更新时间： 2024-04-09 19:03:20

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
28页	410K
描述
32 kHz watch circuit with programmable adaptive motor pulse and pulse period

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PCF2003DUS 数据手册

PCF2003

32 kHz watch circuit with programmable adaptive motor pulse

and pulse period

Rev. 1.1 — 16 October 2019

Product data sheet

1. General description

The PCF2003 is a CMOS integrated circuit 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

period 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.

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 supply current, typical 90 nA

 One second output pulses for bipolar stepping motor

 Five different programmable output periods (1 s to 30 s)

 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

 Test mode for accelerated testing of the mechanical parts of the watch and the IC

 Test bits for type recognition

12 3 4 5 6 7...28

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