4.5 Signal Processing

Vdd = 4.0V, Cx = 10pF, Cs = 10nF, Fosc = 100kHz, Ta = recommended range, unless otherwise noted

Option pin selected;

Nominal timings; dependent on Fosc, Sync

secs

10, 60, infinite

Post-detection recalibration timer duration

Nominal timing dependent on Fosc, Sync

secs

2

Fast negative recalibration timer duration

Nominal timing dependent on Fosc, Sync

ms/level

250

Negative drift compensation rate

Nominal timing dependent on Fosc, Sync

ms/level

1,000

Positive drift compensation rate

samples

6

Consensus filter length (Detection integrator)

counts

5

Fast negative threshold differential

From threshold

counts

2

Hysteresis

From signal reference

counts

12

Threshold differential (positive)

Notes

Units

Value

Description

4.6 Mechanical Dimensions

C

E

B

D

C'

Base level

Seating level

F

H

G

A

ø

8º

0º

8º

0º

!

0.20

0.10

8.0

4.0

H

0.86

0.66

34.0

26.0

G

0.25

0.10

10.0

4.0

F

-

0.650

-

-

25.59

-

E

1.85

1.65

73.0

65.0

D

7.49

6.88

295.0

271.0

C’

0.38

0.23

15.0

9.0

C

5.59

4.98

220.0

196.0

B

8.20

7.39

323.0

291.0

A

Max

Typ

Min

Max

Typ

Min

Metric (mm)

Inches (mils)

SYMBOL

209 mil 20-pin SSOP Dimensions

10

QT240R R1.11/1006