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參數(shù)資料
| 型號： | PCA1487 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 32 kHz watch circuits with adaptive motor pulse |
| 中文描述： | 32千赫的自適應(yīng)電機(jī)脈沖手表電路 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 118K |
| 代理商： | PCA1487 |
1998 Apr 21
5
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA148x series
Voltage level detector
The supply voltage is compared with the internal voltage
reference V
EOL
every minute. The first voltage level
detection is carried out 30 ms after RESET.
When the detected V
DD
voltage level is greater than V
EOL
,
the circuit operates in normal mode (Fig.3).
If the battery end-of-life is detected (V
DD
<
V
EOL
), the
detection and stage control is switched OFF and the
waveform of stage 6 will be executed. To indicate this
condition the waveform is produced in bursts of 4 pulses
every 4 s.
Detection of motor movement
After a motor pulse, the motor is short-circuited to V
DD
for
1 ms. Afterwards the energy in the motor inductor will be
dissipated to measure only the current generated by the
induced motor voltage. During the time t
DI
(dissipation of
energy time) all switches shown in Fig.4 are open to
reduce the current as fast as possible. The current will now
flow through the diodes D3 and D2, or D4 and D1. Then
the first of 52 possible measurement cycles (t
MC
) starts to
measure the induced current.
Fig.4 Motor driving and detecting circuit.
MSA941
VDD
VSS
MOTOR
M1
M2
N1
D3
P1
D1
L1
L2
N2
D4
P2
D2
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCA1487U/10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuits with adaptive motor pulse |
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| PCA1532P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CLOCK CIRCUIT|CMOS|DIP|8PIN |
| PCA1532T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CLOCK CIRCUIT|CMOS|FP|8PIN |
| PCA1534T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CLOCK CIRCUIT|CMOS|FP|8PIN |
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