參數(shù)資料
型號(hào)： PCA2002U/AB/1,026
廠商： NXP Semiconductors
文件頁數(shù)： 26/30頁
文件大?。?/td> 0K
描述： IC WATCH CIRCUIT 32KHZ DIE
標(biāo)準(zhǔn)包裝： 3,600
系列： *
PCA2002
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 8 — 25 November 2011
5 of 30
NXP Semiconductors
PCA2002
32 kHz watch circuit with programmable output period and pulse width
8.
Functional description
8.1 Motor pulse
The motor driver delivers pulses with an alternating polarity. The output waveform across
the motor terminals is illustrated in Figure 3. Between the motor pulses, both terminals are
connected to VDD, which means that the motor is short-circuit.
The following parameters can be selected and are stored in a One Time Programmable
(OTP) memory:
Output periods of 1 s, 5 s, 10 s, 20 s and 30 s
Pulse width (tp) between 0.98 ms and 7.8 ms in steps of 0.98 ms
Full or chopped (75 %) output pulse
Pulse stretching: an enlargement pulse is added to the primary motor pulse. This
enlargement pulse has a duty cycle of 25 % and a width, which is twice the
programmed motor pulse width.
8.2 Time calibration
The quartz crystal oscillator has an integrated capacitance of 5.2 pF, which is lower than
the specified capacitance (CL) of 8.2 pF for the quartz crystal (see Table 10). Therefore,
the oscillator frequency is typically 60 ppm higher than 32.768 kHz. This positive
frequency offset is compensated by removing the appropriate number of 8192 Hz pulses
in the divider chain (maximum 127 pulses), every 1 or 2 minutes. The time correction is
given in Table 4.
Fig 3.
Motor output waveforms
full pulse
mgu718
chopped
pulse
full pulse
with stretching
chopped pulse
with stretching
period
tp
2tp
tp
2tp
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