HT6221A datasheet(2/19 Pages) HOLTEK

2 / 19 page

Pin Assignment

Pin Description

HT6222A

Pin No.

Pin Name

I/O

Internal Connection

Description

1~6

R3~R8

CMOS IN, Pull-low

Row control for keyboard matrix, active high

DOUT

NMOS OUT

Serial data output pin, with a 38kHz carrier

VDD

¾¾

Positive power supply, 2.0V~3.6V for normal operation

CMOS IN

Most significant data bit (D7) code setting

10, 11

¾¾

No connection

VSS

¾¾

Negative power supply, ground

LED

CMOS OUT

Transmission enable indicator output

14~21

C8~C1

I/O

CMOS IN/OUT, Pull-low Column control for keyboard matrix

AIN

CMOS IN, Pull-high

Pull-low

Low byte address codes (8 bits) scan input

23~24

R1~R2

CMOS IN, Pull-low

Row control for keyboard matrix, active high

Approximate Internal Connection Circuits

HT6220A/HT6221A/HT6221B/HT6222A

Rev. 1.10

June 1, 2010

2 4

2 3

2 2

2 1

2 0

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 0

1 1

1 2

2 0

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

A I N

C 1

C 2

C 3

C 4

C 5

C 6

C 7

C 8

L E D

R 1

R 2

R 3

R 4

D O U T

V D D

D 7

N C

V S S

H T 6 2 2 1 A

2 0 S O P - A

H T 6 2 2 2 A

2 4 S O P - A

R 2

R 1

A I N

C 1

C 2

C 3

C 4

C 5

C 6

C 7

C 8

L E D

R 3

R 4

R 5

R 6

R 7

R 8

D O U T

V D D

D 7

N C

V S S

1 6

1 5

1 4

1 3

1 2

1 1

1 0

H T 6 2 2 0 A

1 6 N S O P - A

R 3

R 4

R 5

R 6

D O U T

V D D

D 7

V S S

R 2

R 1

A I N

C 1

C 2

C 3

C 4

C 5

2 0

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

A I N

C 1

C 2

C 3

C 4

C 5

C 6

C 7

C 8

L E D

R 1

R 2

R 3

R 4

D O U T

V D D

D 7

R 5

R 6

V S S

H T 6 2 2 1 B

2 0 S O P - A

V D D

C M O S I N / O U T

C M O S I N

P u l l - l o w

C M O S I N / O U T

P u l l - l o w

C M O S I N

C M O S O U T

V D D

N M O S O U T

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