PCA1673U 查看數據表（PDF） - Philips Electronics

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PCA1673U

32 kHz watch circuits using a silver-oxide or a 3 V lithium battery

Philips Electronics 

Philips Semiconductors

32 kHz watch circuits using a silver-oxide

or a 3 V lithium battery

Product specification

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 ≥ 0 V.

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”.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT(1)

1 672

1 673

1675

1 676

1 677

U

U

U

U/10

U

PERIOD

tT

(s)

1

1

1/16

10

10

PULSE

WIDTH tP

(ms)

7.8

5.8

5.8

5.8

7.8

SPECIFICATIONS

DRIVE

(%)

EEPROM

BATTERY

EOL

REMARKS

DETECTION

56

no

56

no

100

no

56

no

100

no

no

3 V Lithium

no

3 V Lithium

no

no oscillator

no

3 V Lithium

no

1.5 V

Note

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

VM1 - M2

tT

2t T

tP

MSA977

1998 Apr 03

Fig.2 Motor output waveform (normal operation).

3

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