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PCA200110AA Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCA200110AA
Beschreibung 32 kHz watch circuit with programmable adaptive motor pulse
Hersteller NXP Semiconductors
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Gesamt 19 Seiten
PCA200110AA Datasheet, Funktion
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






PCA200110AA Datasheet, Funktion
Philips Semiconductors
32 kHz watch circuit with programmable
adaptive motor pulse
Product specification
PCA2000; PCA2001
handbook, full pagewidth
VDD
RD
D1
P1
P3 P4
MOTOR
MOT1
MOT2
N1
P2
N2
VSS
MGW352
Fig.5 Simplified diagram of motor driving and step detection circuit.
handbook, full pagewidth
I MOT
tp
0.98 ms
(motor shorted)
sampling
voltage
td = 0.98 ms
sampling
programmable time limit
OTP C4 to C6
positive detection level
t
negative detection level
sampling
voltage
sampling results
positive detection
motor shorted
sampling
61 µs
t
negative detection
t
0.49 ms
MGW569
2003 Dec 17
Fig.6 Step detection sequence and corresponding sampling voltage.
6

6 Page









PCA200110AA pdf, datenblatt
Philips Semiconductors
32 kHz watch circuit with programmable
adaptive motor pulse
Product specification
PCA2000; PCA2001
Measurement of oscillator frequency and inhibit time
The output of the two measuring states can either be
monitored directly at pad RESET or as a modulation of the
supply voltage (a modulating resistor of 30 kis
connected between VDD and VSS when the signal at
pad RESET is at HIGH-level).
You must follow the supply voltage modulation (see
Fig.10)) in order to guarantee the correct start up of the
circuit during production and testing.
VDD
t p (stop)
VP(stop)
t(start) > 500 ms
Customer testing
Connecting pad RESET to VSS activates the test mode. In
this test mode, the motor output frequency is 8 Hz; the duty
cycle reduction and battery check occurs every second,
instead of every 4 minutes. If the supply voltage drops
below the EOL threshold voltage, the motor output
frequency is 32 Hz with the highest driving level.
EOL of battery
The supply voltage is checked every 4 minutes. If it drops
below the EOL reference (1.38 V for silver-oxide, 2.5 V for
lithium batteries), the motor steps change from one pulse
per second to a burst of four pulses every 4 seconds. The
step detection is switched off, and the motor is driven with
the highest pulse level.
Only the PCA2000 has an EOL function.
VDD(nom)
VSS
001aaa055
Fig.10 Supply voltage at start up during production
and testing.
handbook, halfVpaDgDe
t p(star t)
VP(start)
t0
t1
t p(stop)
VP(stop)
Measuring states:
State 1: quartz crystal oscillator frequency divided by
1024; state 1 starts with a pulse to VP and ends with a
second pulse to VP
State 2: inhibit time (see Figs 11 and 12); a signal with
periodicity of 31.25 + n × 0.122 ms appears at
pad RESET and as current modulation at pad VDD.
VDD(nom)
VSS
VP(mod)
MGU719
Fig.12 Supply voltage modulation for starting and
stopping of instruction state 2.
handbook, halfpage
VDD
VSS
31.25 ms + inhibition time
MGW355
Fig.11 Output waveform at pad RESET for
instruction state 2.
2003 Dec 17
12

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