參數(shù)資料
型號(hào)： PCA1485
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)： 3/20頁(yè)
文件大?。?/td> 118K
代理商： PCA1485
1998 Apr 21
3
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA148x series
FUNCTIONAL DESCRIPTION AND TESTING
The motor output delivers pulses of six different stages
depending on the torque required to turn the motor (Fig.3).
Every motor pulse is followed by a detection phase which
monitors the waveform of the induced motor voltage.
When a step is missed a correction sequence will be
started (Fig.2).
Motor pulses
The circuit produces motor pulses of six different stages
(stage 1 to 5, stage 6).
Stages 1 to 5 are used in normal operation, stage 6 occurs
under the following conditions:
Correction pulse after a missing step
End-of-life mode
If stage 5 is not enough to turn the motor.
The ON state of the motor pulse varies between 43.75%
and 75% of the duty factor t
DF
= 977
μ
s depending on the
stage (Fig.3). It increases in steps of 6.25% per stage.
After a RESET the circuit always starts and continues with
stage 1, when all motor pulses have been executed.
A failure to execute all motor pulses results in the circuit
going into stage 2, this sequence will be repeated through
to stage 6.
When the motor pulses at stage 5 are not large enough to
turn the motor, stage 6 is implemented for a maximum of
8 minutes with no attempt to keep current consumption
low. After stage 6 has been executed the procedure is
repeated from RESET.
The circuit operates for 8 minutes at a fixed stage, if every
motor pulse is executed. The next 480 motor pulses are
then produced at the next lower stage unless a missing
step is detected. If a step is missed a correction sequence
is produced and for a maximum of 8 minutes the motor
pulses are increased by one stage.
Fig.2 Possible motor output waveform in normal operation with motor connected.
MSA969
MOTOR
PULSE
DETECTION
tP
tD
tC
tT
POSSIBLE CORRECTION
SEQUENCE
M1 - M2
V
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