PCA146X datasheet(13/24 Pages) PHILIPS

13 / 24 page

1998 Apr 21

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuits with adaptive motor

pulse

PCA146x series

Power-on reset

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

VDD from 0 V to 2.1 V should be less than 0.1 ms.

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

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

Customer testing

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

to be used for exact frequency measurement. Every

minute a jitter occurs as a result of the inhibition, which

occurs 90 to 150 ms after disconnecting the RESET from

VDD.

Connecting the RESET to VDD stops the motor pulses

leaving them in a 3-state mode and sets the motor pulse

width for the next available motor pulse to stage 1 in the

silver-oxide mode. A 32 Hz signal without jitter is produced

at the TEST pin.

Debounce time RESET = 14.7 to 123.2 ms.

Connecting RESET to VSS activates Tests 1 and 2 and

disables the inhibition.

Test 1, VDD >VEOL. Normal function takes place except

that the motor pulse period is tT1 = 125 ms instead of tT,

and the motor pulse stage is reduced every second

instead of every 8 minutes. At TEST a speeded-up

8 minute signal is available.

Test 2, VDD <VEOL. Motor pulses of stage 8 are produced,

with a time period of tT2 = 31.25 ms.

Test and reset modes are terminated by disconnecting the

RESET pin.

Test 3, VDD > 5.1 V. Motor pulses of stage 8 are

produced, with a time period of tT3 = 31.25 ms and

× 122 µs to check the contents of the EEPROM. At

TEST a speeded-up cycle for motor pulse period signal tT

is available at 1024 times its normal frequency.

Decreasing VDD voltage level to lower than 2.5 V between

two motor pulses returns the circuit to normal operating

conditions.

AVAILABLE TYPES

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

Note

1. U = Chip in tray; U/7 = chip with bumps on tape; U/10 = chip on foil.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT(1)

PERIOD

(s)

SPECIFICATIONS

PULSE

WIDTH

(ms)

DRIVE

(%)

DETECTION

CRITERION

EEPROM

BATTERY

EOL

DETECTION

REMARKS

1461

U; U/10

7.8

max. 100

P=1

N=2

yes

1.5 V and

2.1 V Lithium

1462

U; U/7;

U/10

5.8

max. 100

P=1

N=2

yes

1.5 V and

2.1 V Lithium

1463

U; U/10

3.9

max. 100

P=1

N=2

yes

1.5 V and

2.1 V Lithium

1465

U/10; U/7

5.8

max. 100

P = 1

N=2

yes

1.5 V

1467

U/10

7.8

max. 100

P = 1

N=2

yes

1.5 V

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