PCA148X datasheet(8/20 Pages) PHILIPS

Part #	PCA148X

Description	32 kHz oscillator, amplitude regulated with excellent frequency stability

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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8 / 20 page

1998 Apr 21

8

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuits with adaptive motor

pulse

PCA148x series

Correction sequence (see Fig.7)

If a missing step is detected, a correction sequence is produced. This consists of a small pulse (tC1) which gives the motor

a defined position and after 29.30 ms a pulse of stage 6 (tC2) to turn the motor.

Fig.7 Correction sequence after a missing motor step with motor connected.

MSA943

MOTOR

PULSE

DETECTION

CORRECTION SEQUENCE

t P

t C1

t D

M1 - M2

V

= 977

µs

t C = 30.27 ms t P

t C2 =t P

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