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參數(shù)資料
| 型號： | PCA1463 |
| 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)： | 3/24頁 |
| 文件大小： | 132K |
| 代理商： | PCA1463 |
1998 Apr 21
3
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
PINNING
SYMBOL
PIN
DESCRIPTION
V
SS
TEST
OSC IN
OSC OUT
V
DD
M1
M2
RESET
1
2
3
4
5
6
7
8
ground (0 V)
test output
oscillator input
oscillator output
supply voltage
motor 1 output
motor 2 output
reset input
Fig.1 Pin configuration, PCA146xT, (PMFP8).
1
2
3
4
8
7
6
5
PCA146xT
VSS
TEST
OSC IN
OSC OUT
RESET
M2
M1
VDD
MSA937
FUNCTIONAL DESCRIPTION AND TESTING
The motor output delivers pulses of six different stages
depending on the torque required to turn the motor
(Figs. 3 and 4). 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 8). Each stage has two independent
modes: silver-oxide and lithium. The voltage level of V
DD
determines which mode is selected (see Section “Voltage
level detector”).
Stages 1 to 5 (both modes) are used in normal operation,
stage 8 occurs under the following conditions:
Correction pulse after a missing step (both modes)
End-of-life mode
If stage 5 is not enough to turn the motor (both modes).
In the silver-oxide mode, the ON state of the motor pulse
varies between 56.25% and 100% of the duty factor
t
DF
= 977
μ
s depending on the stage (Fig.3). It increases
in steps of 6.25% per stage.
In the lithium mode, the ON state of the motor pulse is
reduced by 18.75% of the duty factor t
DF
(Fig.4) to
compensate for the increase in the voltage level.
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 8.
When the motor pulses at stage 5 are not large enough to
turn the motor, stage 8 is implemented for a maximum of
8 minutes with no attempt to keep current consumption
low. After stage 8 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.
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