1.2 Wiring

Table 1.1 Pinlist

Open

Out 7

O/OD

OUT_7

32

32

Open

Out 6

O/OD

OUT_6

31

31

Open

Out 5

O/OD

OUT_5

30

30

Open

Out 4

O/OD

OUT_4

29

29

Open

In binary coded mode, these

pins are clamped internally to

Vss

Out 3

O/OD

OUT_3

28

28

Open

Also, binary coded output 2

Out 2

O/OD

OUT_2

27

27

Open

Also, binary coded output 1

Out 1

O/OD

OUT_1

26

26

Open

Also, binary coded output 0

Out 0

O/OD

OUT_0

25

25

-

Leave open

-

-

n/c

23, 24

-

Open

Active = any key in detect

Detect Status

O/OD

DETECT

22

24

Vdd or Vss

Rising edge sync or LP pulse

Sync In or LP In

I

21

23

-

Leave open

-

-

n/c

18, 19, 20

-

-

0V

Ground

Pwr

Vss

17

22

-

Leave open

-

-

n/c

11, 12, 13,

14, 15, 16

-

Open

To Cs7 + Key

Sense pin

I/O

SN7K

10

21

Open or mode

resistor*

or option resistor*

Sense pin and mode

or option select

I/O

SNS7

9

20

Open or

To Cs6 + Key and/or

Sense pin and

mode select

I/O

SNS6K

8

19

Open or

option resistor*

To Cs6 and/or

option resistor*

Sense pin and

option select

I/O

SNS6

7

18

Open

To Cs5 + Key

Sense pin

I/O

SNS5K

6

17

Open or

option resistor*

To Cs5 and/or

option resistor*

Sense pin and

option select

I/O

SNS5

5

16

Open

To Cs4 + Key

Sense pin

I/O

SNS4K

4

15

Open or

option resistor*

To Cs4 and/or

option resistor*

Sense pin and

option select

I/O

SNS4

3

14

Open

To Cs3 + Key

Sense pin

I/O

SNS3K

2

13

Open or

option resistor*

To Cs3 and/or

option resistor*

Sense pin and

option select

I/O

SNS3

1

12

Open

To Cs2 + Key

Sense pin

I/O

SNS2K

48

11

Open or

option resistor*

To Cs2 and/or

option resistor*

Sense pin and

option select

I/O

SNS2

47

10

Open

To Cs1 + Key

Sense pin

I/O

SNS1K

46

9

Open or

option resistor*

To Cs1 and/or

option resistor*

Sense pin and

option select

I/O

SNS1

45

8

Open

To Cs0 + Key

Sense pin

I/O

SNS0K

44

7

Option resistor

To Cs0 and/or

option resistor

Sense pin and

option select

I/O

SNS0

43

6

-

Leave open

-

-

n/c

38, 39, 40,

41, 42

5

-

Resistor to Vdd and optional

spread spectrum RC network

Oscillator

I

OSC

37

4

-

+2.8 ~ +5.0V

Power

Pwr

Vdd

36

3

Vdd

Active low reset

Reset input

I

/RST

35

2

-

Leave open

-

-

n/c

34

-

100K resistor to Vss

Spread spectrum drive

Spread spectrum

OD

SS

33

1

If Unused

Notes

Function

Type

Name

48-SSOP

Pin

32-QFN

Pin

Pin Type

I

CMOS input only

I/O

CMOS I/O

O

CMOS push-pull output

OD

CMOS open drain output

O/OD

CMOS push pull or open-drain output (option selected)

Pwr

Power / ground

Notes

* Option resistor is required only in Full Options mode (see Figure 1.1)

4

QT1080 R11.06/0806