PCA1673U datasheet(3/12 Pages) PHILIPS

3 / 12 page

1998 Apr 03

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuits using a silver-oxide

or a 3 V lithium battery

PCA167x series

FUNCTIONAL DESCRIPTION AND TESTING

Motor pulse

The motor output pulse widths (tP) and the cycle times (tT)

are given in Chapter “Available types”.

Power-on reset

For correct operation of the Power-on reset the rise time of

VDD from 0 V to 1.55 V should be less than 0.1 ms.

All resettable flip-flops are reset. Additionally the polarity of

the first motor pulse is positive: VM1 − VM2 ≥ 0V.

Customer testing and stop mode

An output frequency of 32 Hz is provided at RESET (pin 8)

to be used for exact frequency measurement.

Connecting the RESET to VDD stops the motor pulses

leaving them in a HIGH impedance 3-state condition and a

32 Hz signal is produced at the TEST pin. A debounce

circuit protects against accidental stoppages due to

mechanical shock to the watch (tDEB = 14.7 to 123.2 ms).

Connecting RESET to VSS activates the test mode.

The motor pulse period is 31.25 ms instead of tT. Test and

stop mode are disabled by disconnecting RESET

(open-circuit).

AVAILABLE TYPES

Refer to Fig.2 and to Chapters “Ordering information” and “Functional description and testing”.

Note

1. U = Chip in trays; U/10 = chip on foil.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT(1)

PERIOD

(s)

SPECIFICATIONS

PULSE

WIDTH tP

(ms)

DRIVE

(%)

EEPROM

BATTERY

EOL

DETECTION

REMARKS

1672

7.8

3 V Lithium

1673

5.8

3 V Lithium

1675

1/16

5.8

100

no oscillator

1676

U/10

5.8

3 V Lithium

1677

7.8

100

1.5 V

Fig.2 Motor output waveform (normal operation).

MSA977

VM1 - M2

2t T

t T

t P

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