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參數(shù)資料
| 型號(hào)： | PCA2000 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 32 kHz watch circuit with programmable adaptive motor pulse |
| 中文描述： | 32千赫的可編程自適應(yīng)脈沖馬達(dá)手表電路 |
| 文件頁(yè)數(shù)： | 7/19頁(yè) |
| 文件大?。?/td> | 120K |
| 代理商： | PCA2000 |
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2003 Dec 17
7
Philips Semiconductors
Product specification
32 kHz watch circuit with programmable
adaptive motor pulse
PCA2000; PCA2001
Time calibration
The quartz crystal oscillator has an integrated capacitance
of 5.2 pF, which is lower than the specified capacitance
(C
L
) of 8.2 pF for the quartz crystal. Therefore, the
oscillator frequency is typically 60 ppm higher than
32.768 kHz.Thispositivefrequencyoffsetiscompensated
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 1.
After measuring the effective oscillator frequency, the
numberofcorrectionpulsesmustbecalculatedandstored
together with the calibration period in the OTP memory
(see Section “Programming the memory cells”).
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.
Detailsonhow tomeasure theoscillatorfrequencyandthe
programmed inhibit time are given in Section
“Measurement of oscillator frequency and inhibit time”.
Reset
At pin RESET an output signal with a frequency of
= 32 Hz is provided.
Connecting pad RESET to V
DD
stops the motor drive and
opens all four (P1, N1, P2 and N2) driver switches (see
Fig.5). Connecting pad 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.
After releasing the pad RESET, the motor starts exactly
one second later with the smallest duty cycle and with the
opposite polarity to the last pulse before stopping.
The debounce time for the RESET function is between
31 and 62 ms.
Programming possibilities
The programming data is stored in OTP cells (EPROM
cells). At delivery, all memory cells are in state 0. The cells
can be programmed to the state 1, but then there is no
more set back to state 0.
The programming data is organized in an array of three
8-bit words: word A contains the time calibration, and
words B and C contain the setting for the monitor pulses
(see Table 2).
1024
f
osc
×
1024
f
osc
×
Table 1
Time calibration
Table 2
Words and bits
CALIBRATION PERIOD
CORRECTION PER STEP (n = 1)
CORRECTION PER STEP (n = 127)
ppm
seconds per day
ppm
seconds per day
1 minute
2 minutes
2.03
1.017
0.176
0.088
258
129
22.3
11.15
WORD
BIT
1
2
3
4
5
6
7
8
A
number of 8192 Hz pulses to be removed
calibration
period
B
lowest stage: duty cycle
number of driving stages
highest stage:
duty cycle and
stretching
factory test bit
C
pulse width
maximum time delay between positive
and negative detection pulses
EOL
voltage
factorytest
bit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCA200010AA | 32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2000AA | 32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2001 | 32 kHz watch circuit with programmable adaptive motor pulse |
| PCA200110AA | 32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2001AA | 32 kHz watch circuit with programmable adaptive motor pulse |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA2000_10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse |
| PCA200010AA | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2000AA | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2000CX8/5 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse |
| PCA2000CX8/5/1,025 | 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 |
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