PCA2000_2001

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© NXP B.V. 2010. All rights reserved.

Product data sheet

Rev. 08 — 23 August 2010

14 of 30

NXP Semiconductors

PCA2000; PCA2001

32 kHz watch circuit with programmable adaptive motor pulse

7.9 Frequency tuning of assembled watch

Figure 9 shows the test set-up for frequency tuning the assembled watch.

7.10 Measurement of oscillator frequency and inhibition 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 k

Ω is connected

The supply voltage modulation must be followed as shown in Figure 10 in order to

guarantee the correct start-up of the circuit during production and testing.

Fig 9.

Frequency tuning at assembled watch

mgw568

FREQUENCY

COUNTER

PROGRAMMABLE

DC POWER SUPPLY

PC INTERFACE

PC

M

motor

32 kHz

PCA200x

battery

Fig 10. Supply voltage at start-up during production and testing

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