W81281 View Datasheet(PDF) - Winbond

Part Name

Description

Manufacturer

W81281

USB Keyboard / Device Controller

Winbond 

5. PIN DESCRIPTION

W81281

Preliminary

5.1 40 PIN DIP

PIN NO.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

NAME

VSS

D+

D-

VDD3

SI0/P10

SI1/P11

SI2/P12

SI3/P13

SO04/P04

SO05/P05

SO06/P06

SO07/P07

IDSEL/P30

LED0/P33

PSCLK/P32

PSDA/P31

LED1/P34

LED2/P35

RESET

X2

X1

VDD

SO08/P20

SO09/P21

SO10/P22

SO11/P23

SO12/P24

SO13/P25

TYPE

POWER

I/O

I/O

POWER

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

INPUT

OUTPUT

INPUT

POWER

I/O

I/O

I/O

I/O

I/O

I/O

DESCRIPTION

Ground

USB signal (+)

USB signal (-)

DC power 3.3V output

Keyboard scan Input 0 / Internal µC IO port 1.0

Keyboard scan Input 1 / Internal µC IO port 1.1

Keyboard scan Input 2 / Internal µC IO port 1.2

Keyboard scan Input 3 / Internal µC IO port 1.3

Keyboard scan Output 04 / Internal µC IO port 0.4

Keyboard scan Output 05 / Internal µC IO port 0.5

Keyboard scan Output 06 / Internal µC IO port 0.6

Keyboard scan Output 07 / Internal µC IO port 0.7

Vendor ID selection / Internal µC IO port 3.0

Num. Lock LED / Internal µC IO port 3.3

PS/2 mouse clock pin / Internal µC IO port 3.2

PS/2 mouse data pin / Internal µC IO port 3.1

Caps Lock LED / Internal µC IO port 3.4

Scroll Lock LED / Internal µC IO port 3.5

Chip reset pin

Clock output

Clock input

VDD power

Keyboard scan Output 08 / Internal µC IO port 2.0

Keyboard scan Output 09 / Internal µC IO port 2.1

Keyboard scan Output 10 / Internal µC IO port 2.2

Keyboard scan Output 11 / Internal µC IO port 2.3

Keyboard scan Output 12 / Internal µC IO port 2.4

Keyboard scan Output 13 / Internal µC IO port 2.5

6

Publication Release Date: July 1999

Revision 0.60

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