HT6221 datasheet(3/15 Pages) HOLTEK

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Pad Coordinates

Unit: mil

Pad No.

-38.44

28.57

38.21

-32.09

-38.44

24.06

38.21

-18.90

-38.44

19.55

38.21

-10.33

-38.44

9.91

38.21

2.87

-38.44

1.95

38.21

11.13

-38.44

-22.72

38.21

24.33

-38.44

-30.03

31.14

34.20

-37.83

-34.54

21.80

34.19

-20.31

-34.54

-12.62

34.19

-15.72

-34.54

-22.26

34.19

-11.21

-34.54

-26.77

34.19

27.27

-34.54

-36.41

34.19

Pin Description

HT6222

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

CMOS OUT

Serial data output pin, with a 38kHz carrier

VDD

¾¾

Positive power supply, 1.8V~3.5V for normal operation

CMOS IN

Most significant data bit (D7) code setting

OSCILLATOR

455kHz resonator oscillator output

OSCILLATOR

455kHz resonator oscillator input

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

HT6221/HT6222

Rev. 1.50

October 1, 2007

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 S C I L L A T O R

X 1

X 2

E N

1 0 M W

C M O S O U T

V D D

C M O S I N / O U T

P u l l - l o w

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