參數(shù)資料
型號(hào)： PCA1486
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(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 118K
代理商： PCA1486
1998 Apr 21
6
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA148x series
Detection criteria
The PCA148x uses current detection in two defined parts
of the detection phase to determine if the motor has moved
(refer to Figs 5 and 6). The detection criteria are:
part 1
Minimum value of P = 1; where P = number of
measured positive current polarities after t
DI
.
part 2
Minimum value of N = 2; where N = number of
measured positive current polarities since the first
negative current polarity after part 1 was detected
(see Fig.5).
If the opposite polarity is measured in one part, the internal
counter is reset, so the results of all measurements in this
part are ignored.
The waveform of the induced current must enable all these
measurements within the time t
D
after the end of a positive
motor pulse in order to be accepted as a waveform of an
executed motor pulse.
If the detection criterion is satisfied earlier, a measurement
cycle will not be started and the switches P1 and P2 stay
closed, the motor is switched to V
DD
.
Every measurement cycle (t
MC
) has 4 phases. These are
detailed in Table 1.
Note that detection and pulse width control will be switched
OFF when the battery voltage is below the end-of-life
voltage (V
EOL
), or if stage 5 is not sufficient to turn the
motor.
Table 1
Measurement cycle
SYMBOL
PHASE
DESCRIPTION
t
M1
1
During t
M1
the switches P1 and P2 are closed in order to switch the motor to V
DD
, so the
induced current flows unaffected through the motor inductance.
Measures the induced current; during a maximum time t
M2
all switches are open until a
change is sensed by one of the level detectors (L1, L2). The motor is short-circuited to V
DD
.
Depending on the direction of the interrupted current:
The current flows through diodes D3 and D2, causing the voltage at M1 to decrease in
relation to M2;
The current flows through diodes D4 and D1, causing the voltage at M2 to decrease in
relation to M1.
A successfully detected current polarity is normally characterized by a short pulse of
0.5 to 10
μ
s with a voltage up to
±
2.1 V, failed polarity detection by the maximum pulse width
of 61
μ
s and a voltage of
±
0.5 V (see Fig.6).
The switches P1 and P2 remain closed for the time t
M3
.
If the circuit detects fewer pulses than P and N respectively, a pulse of the time t
M4
occurs to
reduce the induced current. Therefore P2 and P1 are opened and N1 and N2 are closed.
Otherwise P1 and P2 remain closed.
t
M2
2
t
M3
t
M4
3
4
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