PCA1485USLASH7 datasheet(14/20 Pages) PHILIPS

14 / 20 page

1998 Apr 21

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuits with adaptive motor

pulse

PCA148x series

TIMING PARAMETERS

Note

1. No option available when EOL indication is required.

SYMBOL

PARAMETER

SECTION

VALUE

OPTION

UNIT

cycle for motor pulse (note 1)

motor pulse (Figs 2 and 3)

5, 10, 12 or 20

motor pulse width

7.81

3.9 or 5.9

tDF

duty factor

977

−µs

tONL

last duty factor on

183 to 488

−µs

voltage detection cycle

level mode

−

tSON

duty factor on

silver-oxide mode (Fig.3)

427 to 733

−µs

tSOFF

duty factor off

550 to 244

−µs

tSONF

ﬁrst duty factor on

244

−µs

EOL sequence

end-of-life mode

−

tE1

motor pulse width

−

tE2

time between pulses

31.25

−

detection sequence

detection (Fig.6)

4.3 to 28.3

−

tDS

short-circuited motor

977

−µs

tDI

dissipation of energy

977

−µs

tMC

measurement cycle

488

−µs

tM1

phase 1

244

−µs

tM2

phase 2 (measure window)

−µs

tM3

phase 3

122

−µs

tM4

phase 4

−µs

positive current polarities

P < N

negative current polarities

2 to 6

correction sequence

correction sequence (Fig.7)

tP + 30.27

−

tC1

small pulse width

977

−µs

tC2

large pulse width

−

cycle time for motor pulses in: testing

tT1

test 1

125

−

tT2

test 2

31.25

−

tT3

test 3

see Fig.9

31.25 to 39

−

tDEB

debounce time for

RESET = VDD

14.7 to 123.2

−

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