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參數(shù)資料
| 型號(hào)： | PCA2002 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 32 kHz watch circuit with programmable output period and pulse width |
| 中文描述： | 32千赫的可編程輸出和脈沖寬度的手表電路 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 124K |
| 代理商： | PCA2002 |
2004 Jan 20
5
Philips Semiconductors
Product specification
32 kHz watch circuit with programmable
output period and pulse width
PCA2002
Time calibration
Thecrystaloscillatorhasanintegratedloadcapacitanceof
5 pF, which is lower than the specified load capacitance of
8.2 pF for the quartz crystal.
It oscillates therefore, at a frequency which is typically
60 ppm higher than 32.768 kHz. This positive frequency
offset is then compensated by removing, every minute or
every two minutes, the appropriate number of 8192 Hz
pulses (maximum 127 pulses) of the divider chain. The
timing correction is given in Table 1.
After measuring the effective oscillator frequency, the
numberofcorrectionpulsesmustbecalculatedandstored
together with the calibration period in the OTP memory;
see Section “Programming procedure”.
The oscillator frequency can be measured at pad RESET,
where a square wave signal with the frequency of
1
is provided.
This frequency shows a jitter every minute or every two
minutes,dependingontheprogrammedcalibrationperiod,
which originates from the time calibration.
Detailsonhowtomeasure theoscillatorfrequencyandthe
programmed inhibition time are given in Section
“Programming procedure”.
1024
f
osc
×
Table 1
Timing correction
CALIBRATION
PERIOD (min)
CORRECTION PER STEP (N = 1)
CORRECTION PER STEP (N = 127)
ppm
s/day
ppm
s/day
1
2
2.03
1.017
0.176
0.088
258
129
22.3
11.15
Reset
At pin RESET an output signal with a frequency of
1024
= 32 Hz is provided.
Connecting pin RESET to V
DD
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 V
SS
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.
Programming possibilities
The programming data is stored in two words; see Table 2.
-----1
f
osc
×
Table 2
Words and bits
WORD
BIT
1
2
3
4
5
6
7
8
A
B
number of 8192 Hz pulses to be removed
pulse width
calibration period
pulse stretching
output period
duty cycle
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PCA2002CX8/5/1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002CX8/5/1,025 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 32KHZ WATCH CIRCUIT RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| PCA2002T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK/1,118 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 WATCH IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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