参数资料
型号: PCA2002TK/1,118
厂商: NXP Semiconductors
文件页数: 26/30页
文件大小: 0K
描述: IC WATCH CIRCUIT 10HVSON
标准包装: 6,000
类型: 时钟/频率发生器
PLL:
主要目的: 电池式腕表
输入: 晶体
电路数: 1
比率 - 输入:输出: 1:2
差分 - 输入:输出: 无/无
频率 - 最大: 32kHz
电源电压: 1.1 V ~ 3.6 V
工作温度: -10°C ~ 60°C
安装类型: 表面贴装
封装/外壳: 10-VFDFN 裸露焊盘
供应商设备封装: 10-HVSON(3x3)
包装: 管件
其它名称: 935275138118
PCA2002TK-T
PCA2002TK-T-ND
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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