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| 型号： | PCA2002CX8/5/1,025 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 27/30页 |
| 文件大小： | 0K |
| 描述： | IC WATCH CIRCUIT 32KHZ DIE |
| 标准包装： | 15,064 |
| 系列： | * |
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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
6 of 30
NXP Semiconductors
PCA2002
32 kHz watch circuit with programmable output period and pulse width
After measuring the effective oscillator frequency, the number of correction pulses must
be calculated and stored together with the calibration period in the OTP memory (see
The oscillator frequency can be measured at pad RESET, where a square wave signal
with the frequency of
is provided.
This frequency shows a jitter every minute or every two minutes, depending on the
programmed calibration period, which originates from the time calibration.
Details on how to measure the oscillator frequency and the programmed inhibition time
are given in Section 8.10.
8.3 Reset
At pin RESET an output signal with a frequency of
is provided.
Connecting pin RESET to VDD stops the motor drive and opens the motor switches.
After releasing pin RESET, the first motor pulse is generated exactly one period later with
the opposite polarity to the last pulse before stopping. The debounce time for the reset
function is between 31 ms and 62 ms.
Connecting pin RESET to VSS activates the test mode. In this mode the motor output
frequency is 32 Hz, which can be used to test the mechanical function of the watch.
8.4 Programming possibilities
The programming data is organized in an array of 8-bit words (see Table 5): Word A
contains the time calibration, word B the setting for the monitor pulses, word C is not used
and word D contains the type recognition.
Table 4.
Time calibration
Calibration
period
Correction per step (n = 1)
Correction per step (n = 127)
ppm
seconds per day ppm
seconds per day
1 minute
2.03
0.176
258
22.3
2 minutes
1.017
0.088
129
11.15
1
1024
------------
f
osc
1
1024
------------
f
osc
32Hz
=
Table 5.
Words and bits
Word
Bit
1
2
3
4
5
6
7
8
A
number of 8192 Hz pulses to be removed
calibration
period
B
pulse width
output period
duty
cycle
pulse
stretching
C
D
type
factory test bit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA2002T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK/1,118 | 功能描述:马达/运动/点火控制器和驱动器 WATCH IC RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| PCA2002TK-T | 功能描述:马达/运动/点火控制器和驱动器 WATCH IC RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| PCA2002U/10AA | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
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