PCA2002U/10AB/1,00 NXP Semiconductors, PCA2002U/10AB/1,00 Datasheet - Page 10

• Manufacturer Part Number: PCA2002U/10AB/1,00
• Manufacturer: NXP Semiconductors

Specifications of PCA2002U/10AB/1,00

• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
PCA2002_6
Product data sheet
7.10 Measurement of the oscillator frequency and the inhibition time
7.9 Frequency tuning at assembled watch
Figure 7
The output of the two measuring states can either be monitored directly at pin RESET or
as a modulation of the supply current (a modulating resistor of 30 kΩ is connected
between V
The supply voltage modulation must be followed as shown in
guarantee the correct start-up of the circuit during production and testing.
Measuring states:
Fig 7.
Fig 8.
•
•
State 1; quartz crystal oscillator frequency divided by 1024; state 1 starts with a pulse
to V
State 2; inhibition time has a value of n × 0.122 ms. A signal with the periodicity of
31.25 ms + n × 0.122 ms appears at pin RESET and as current modulation at pin V
(see
P
shows the test set-up for frequency tuning the assembled watch.
Figure 8
Frequency tuning the assembled watch
Output waveform at pin RESET for instruction state 2
and ends with a second pulse to V
DD
32 kHz watch circuit with programmable output period and pulse width
and V
DC POWER SUPPLY
PROGRAMMABLE
All information provided in this document is subject to legal disclaimers.
and
SS
PC INTERFACE
Figure
when the signal at pin RESET is at HIGH-level).
V
V
Rev. 06 — 6 May 2010
DD
FREQUENCY
SS
COUNTER
PC
9)
31.25 ms + inhibition time
P
PCA200x
32 kHz
mgw355
V
Figure 4
O(dif)
motor
battery
M
mgw568
PCA2002
in order to
© NXP B.V. 2010. All rights reserved.
10 of 26
DD