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PDF PCA2000 Data sheet ( Hoja de datos )
| Número de pieza | PCA2000 | |
| Descripción | 32 kHz watch circuit with programmable adaptive motor pulse | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
PCA2000; PCA2001
32 kHz watch circuit with
programmable adaptive motor
pulse
Product specification
Supersedes data of 2003 Feb 04
2003 Dec 17
1 page  
Philips Semiconductors
32 kHz watch circuit with programmable
adaptive motor pulse
Product specification
PCA2000; PCA2001
handbook, full pagewDidUthTY CYCLE
37.5 %
43.75 %
50 %
56.25 %
62.5 %
68.75 %
75 %
81.25 %
100 %
0.244 ms
0.122 ms
0.98 ms
0.98 ms
0.98 ms
0.98 ms
MGW351
Fig.4 Possible modulations for a 3.9 ms motor pulse.
Step detection
Figure 5 shows a simplified diagram of the motor driving
and step detection circuit, and Fig.6 shows the step
detection sequence and corresponding sampling current.
Between the motor driving pulses, the switches P1 and P2
are closed, which means the motor is short-circuited. For
a pulse in one direction, P1 and N2 are open, and
P2 and N1 are closed with the appropriate duty cycle; for
a pulse in the opposite direction, P2 and N1 are open, and
P1 and N2 closed.
The step detection phase is initiated after the motor driving
pulse (see Fig.3). P1 and P2 are first closed for 0.98 ms
and then all four drive switches (P1, N1, P2 and N2) are
opened for 0.98 ms.
As a result, the energy stored in the motor inductance is
reduced as fast as possible.
The induced current caused by the residual motor
movement is then sampled in phase 3 (closing P3 and P2)
and in phase 4 (closing P1 and P4). For step detection in
the opposite direction P1 and P4 are closed during
phase 3 and P2 and P3 during phase 4 (see Fig.6).
The condition for a successful motor step is a positive step
detection pulse (current in the same direction as in the
driving phase) followed by a negative detection pulse
within a given time limit. This time limit can be programmed
between 3.9 and 10.7 ms (in steps of 0.98 ms) in order to
ensure a safe and correct step detection under all
conditions (for instance magnetic fields). The step
detection phase stops after the last 31.25 ms, after the
start of the motor driving pulse.
2003 Dec 17
5
5 Page 
Philips Semiconductors
32 kHz watch circuit with programmable
adaptive motor pulse
Product specification
PCA2000; PCA2001
VDD(mod)
VP(start)
VP(mod)
VDD
VSS
t p(start)
t0 t1 t1 t1 t3
VP(stop)
t2 t2 t2 t2 t2
t p(stop)
I DD
(1)
mgw357
(1) ∆IDD = 3---V-0---D--k--D-Ω---
Fig.8 Supply voltage modulation and corresponding supply current variation for reading word B.
Frequency tuning of assembled watch
Figure 9 shows the test set-up for frequency tuning the assembled watch.
handbook, full pagewidth
2003 Dec 17
FREQUENCY
COUNTER
PROGRAMMABLE
DC POWER SUPPLY
PC INTERFACE
32 kHz
PCA200x
M
motor
battery
PC
MGW568
Fig.9 Frequency tuning at assembled watch.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet PCA2000.PDF ] | |
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