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參數(shù)資料
| 型號： | 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)： | 6/20頁 |
| 文件大?。?/td> | 124K |
| 代理商： | PCA2002 |
2004 Jan 20
6
Philips Semiconductors
Product specification
32 kHz watch circuit with programmable
output period and pulse width
PCA2002
Table 3
Description of word A bits
Table 4
Description of word B bits
General start up sequence
You must follow the next sequence to ensure the correct
operation at start up:
1.
Apply the supply voltage to the circuit.
2.
Wait at least two seconds.
3.
ConnectpinRESETtopinV
DD
foraminimumof62 ms
(this activates the stop mode).
4.
Disconnect pin RESET from pin V
DD
(this resets the
circuit to normal operating mode).
After this sequence the memory contents are read
immediately and the programmed options are set. This
sequence also resets all major circuit blocks and ensures
that they function correctly.
To ensure that the oscillator starts up correctly you must
execute a reset sequence (see Fig.5).
Programming procedure
For a watch it is essential that the timing calibration can be
made after the watch is fully assembled. In this situation,
the supply pins are often the only terminals which are still
accessible.
Writing to the OTP cells and performing the related
functional checks is achieved in the PCA2002 by
modulating the supply voltage. The necessary control
circuit consists basically of a voltage level detector, an
instruction state counter (which determines the function to
be performed) and an 8-bit shift register which allows
writingtheOTPcellsofan8-bitwordinonestepandwhich
acts as data pointer for checking the OTP content.
BIT
VALUE
DESCRIPTION
Inhibit time
1 to 7
the number of the 8192 Hz pulses to
be removed (binary coded;
MSB = A1, LSB = A7)
Calibration period
8
0
1
1 minute
2 minutes
BIT
VALUE
DESCRIPTION
Pulse width t
p
(ms)
1 to 3
000
001
010
011
100
101
110
111
0.98
1.95
2.9
3.9
4.9
5.9
6.8
7.8
Output period (s)
4 to 6
000
001
010
011
100
1
5
10
20
30
Duty cycle of motor pulse
7
0
1
75 %
100 %
Pulse stretching
8
0
1
no pulse stretching
a pulse width of 2t
p
and a duty factor
of 25 % is added
V
DD
V
P(stop)
t
(start)
>
500 ms
V
SS
V
DD(nom)
001aaa285
t
p(stop)
Fig.5 Supply voltage at start up.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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/點(diǎn)火控制器和驅(qū)動器 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/點(diǎn)火控制器和驅(qū)動器 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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