HOLTEK HT6221, HT6222 User Manual

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Features

Operating voltage: 1.8V~3.5V

·

DOUT with 38kHz carrier for IR medium

·

Low standby current

·

Minimum transmission word: one word

·

455kHz ceramic resonator or crystal

·

16-bit address codes

·

8-bit data codes

·

Applications

Television and video cassette recorder con

·

trollers
Burglar alarm systems

·

Smoke and fire alarm systems

·

Garage door controllers

·

General Description

The HT6221/HT6222 are CMOS LSI encoders
designed for use in remote control systems. They
are capable of encoding 16-bit address codes and
8-bit data codes. Each address/data input can be
set to one of the two logic states, 0 and 1.

HT6221/HT6222

Multi-Purpose Encoders

PPM code method

·

Three double-active keys

·

Maximum active keys

·

-

HT6221: 32 keys

-

HT6222: 64 keys

Low power and high noise immunity

·

CMOS technology

Car door controllers

·

­Car alarm systems

·

Security systems

·

Other remote control systems

·

The HT6221/HT6222 contain 32 keys
(K1~K32) and 64 keys (K1~K64), respectively.
When one of the keys is triggered, the pro­grammed address/data is transmitted together
with the header bits via an IR (38kHz carrier)
transmission medium.

Block Diagram

R1

R8

X2 X1

O scillator D ivider

24 C ounter &

Keyboard

Matrix &

Gate

Circuit

C1 C8 AIN D7

Data ROM

& R egisters

¸

1 of 24 D ecoder

Binary D etector

1 March 2, 2000

D ata S elect

& Buffer

Sync.

Circuit

VDD VSS

DOUT

LED

Pin Assignment

Pad Assignment

R1

R2

R3

R4

DOUT

VDD

D7

X2

X1

VSS

20

1

19

2

18

3

17

4

16

5

15

6

14

7

13

8

12

9

11

10

H T6221

20 D IP/SOP

KI2

KI3

AIN

C1

C2

C3

C4

C5

C6

C7

C8

LED

KI1

HT6221/HT6222

1

R3

2

R4

3

R5

4

R6

5

R7

6

R8

VDD

D7

X2

X1

VSS

7

8

9

10

11

12

DOUT

24 D IP /S O P

KI0

H T6222

CCS

24

R2

23

R1

22

AIN

21

C1

20

C2

19

C3

18

C4

17

C5

16

C6

15

C7

14

C8

13

LED

KIO 0

19

KIO 1

18

KIO 2

17

16

KIO 3

15

KIO 4

14

KIO 5

KI4

KI5

KI6

KI7

REM

VDD

SEL

OSCO

23

24

1

2

3

4

5

6

7

8

21

22

9

10

OSCI

VSS

Chip size: 94 ´ 104 (mil)

20

(0 ,0 )

11

LM B

13

12

KIO 6

KIO 7

2

* The IC substrate should be connected to VDD in the PCB layout artwork.

2 March 2, 2000

HT6221/HT6222

Pad Coordinates Unit: mil

Pad No. X Y Pad No. X Y

1

2

3

4

5

6

7

8

9

10

11

12 24.31

-41.99

-41.99

-41.99

-41.99

-41.99 -5.61

-41.99 -28.31

-41.99 -37.83

-41.99 -46.88

-20.95 -46.88

-14.32 -46.88

-4.25 -46.88

Pin Description

HT6222

Pin No. Pin Name I/O

1~6 R3~R8 I

7 DOUT O CMOS OUT Serial data output pin, with a 38kHz carrier

8 VDD

9 D7 I CMOS IN Most significant data bit (D7) code setting

10 X2 O OSCILLATOR 455kHz resonator oscillator output

11 X1 I OSCILLATOR 455kHz resonator oscillator input

12 VSS

13 LED O CMOS OUT Transmission enable indicator output

14~21 C8~C1 I/O

22 AIN I

23~24 R1~R2 I

34.43 13 34.17

22.02 14 41.95

15.39 15 41.95

2.98 16 41.95

17 41.95 12.16

18 41.95 22.02

19 39.99 46.84

20 28.26 46.84

21

22

23

-46.88

Connection

¾¾

¾¾

CMOS IN/OUT

24

Internal

CMOS IN

Pull-low

Pull-low

CMOS IN

Pull-high

Pull-low

CMOS IN

Pull-low

-11.18

-23.16

-29.79

-39.27

Row control for keyboard matrix, active high

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

Negative power supply

Column control for keyboard matrix

Low byte address codes (8 bits) scan input

Row control for keyboard matrix, active high

-46.88

-30.26

-13.98

-4.12

46.84

46.84

46.84

46.84

Description

3 March 2, 2000

Approximate internal connection circuits

HT6221/HT6222

CMOS IN/O UT

V

DD

OSCILLATOR

X1

10M

W

CMOS IN/O UT

Pull-low

X2

EN

CMOS IN
Pull-low

CMOS IN

CMOS OUT

V

DD

Absolute Maximum Ratings

Supply Voltage.................................-0.3V to 6V

Input Voltage .................V

-0.3V to VDD+0.3V

SS

Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi

mum Ratings" may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo­sure to extreme conditions may affect device reliability.

Storage Temperature.................-50°Cto125°C

Operating Temperature ..............-20°Cto75°C

-

Electrical Characteristic

Symbol Parameter

V

I

I

I

I

I

I

I

STB

DD

OH1

OL1

OH2

OL2

OH3

Operating Voltage

DD

Standby Current 3V Oscillator stops

Operating Current 3V

Output Source Current for DOUT 3V

Output Sink Current for DOUT 3V

Output Source Current for LED 3V

Output Sink Current for LED 3V

Output Source Current for C1~C8 3V

Ta=25°C

Test Conditions

Min. Typ. Max. Unit

V

4 March 2, 2000

Conditions

DD

¾¾

=455kHz

f

OSC

No load

V

=2.7V

O

V

=0.3V

O

V

=2.7V

O

V

=0.3V

O

V

=2.7V

O

1.8 3 3.5 V

0.1 1.0

¾

200 400

¾

-2.0 -4.0 ¾

50 100

mA

mA

mA

¾mA

-10 -60 ¾mA

1.2 2.0

-0.6 -2.0 ¾

¾

mA

mA

HT6221/HT6222

Symbol Parameter

I

V

V

V

V

V

V

R

R

R

R

f

OSC

OL3

Output Sink Current for C1~C8 3V

Input High Voltage for R1~R8 3V

IH1

Input Low Voltage for R1~R8 3V

IL1

Input High Voltage for C1~C8 3V

IH2

Input Low Voltage for C1~C8 3V

IL2

Input High Voltage for AIN 3V

IH3

Input Low Voltage for AIN 3V

IL3

Input Pull-high Resistance for AIN 3V

PH1

Input Pull-low Resistance for AIN 3V

PL1

Input Pull-low Resistance for R1~R8 3V

PL2

Input Pull-low Resistance for C1~C8 3V

PL3

System Frequency

Functional Description

Keyboard scan

The HT6221/HT6222 remain in the halt mode
during the standby state (at this time, the oscil­lator stops, and the standby current<1mA). The
HT6221 consists of 32 active keys, and the
HT6222 has 64 active keys. The keyboard
forms of the HT6221/ HT6222 are shown below.

·

The HT6221 keyboard form

C1 C2 C3 C4

K1

R1

R2

K2

R3

K3

R4

K4

K5

K6

K7

K8

K9

K10

K11

K12

C5 C6 C7 C8

K13

K17

K14

K18

K15

K19

K16

K20

K21

K22

K23

K24

K25

K26

K27

K28

K29

K30

K31

K32

Test Conditions

DD

Conditions

V

=0.3V

O

V

¾

¾

¾

¾

¾

¾

V

=0V

IN

V

=3V

IN

V

=3V

IN

V

=3V

IN

455kHz ceramic

¾

resonator

·

The HT6222 keyboard form

C1

C2 C3 C4 C5 C6 C7 C8

K9

K5

K1

R1

R2

R3

R4

R5

R6

R7

R8

K2

K3

K4

K33

K34

K35

K36

K6

K7

K8

K37

K38

K39

K40

K10

K11

K12

K41

K42

K43

K44

Min. Typ. Max. Unit

10 30

1.9

0

1.1

0

1.25

0

100 200 400

70 150 250

120 200 320

300 500 1500

455

¾

K17

K13

K18

K14

K19

K15

K20

K16

K49

K45

K50

K46

K51

K47

K52

K48

¾

¾

¾

¾

¾

¾

K21

K22

K23

K24

K53

K54

K55

K56

¾mA

3.0 V

0.8 V

3.0 V

0.6 V

3.0 V

0.6 V

kW

kW

kW

kW

kHz

¾

K25

K29

K26

K30

K27

K31

K28

K32

K57

K61

K58

K62

K59

K63

K60

K64

5 March 2, 2000

HT6221/HT6222

When one of the keys (32 or 64 keys) is triggered
for over 36ms, the oscillator is enabled and the
chip is activated. If the key is pressed and held
for 108ms or less, the 108ms transmission codes
are enabled and comprised of a header code
(9ms), an off code (4.5ms), low byte address
codes (9ms~18ms), high byte address codes
(9ms~18ms), 8-bit data codes (9ms~18ms), and
the inverse codes of the 8-bit data codes
(18ms~9ms). After the pressed key is held for
108ms, if the key is still held down, the trans

To avoid mistakes made by keyboard scanning
or simultaneous two-key inputs (except for the
three double-key active functions (K21+K22,
K21+K23, and K21+K24), the HT6221/HT6222
are facilitated with 36ms starting time.

The HT6221/HT6222 also provide three dou
ble-key active functions (K21+K22, K21+K23,
and K21+K24) for tape deck recording opera
tions. The double-key operation rules are
shown in timing 4 and timing 6.

-

mission codes turn out to be a composition of
header (9ms) and off codes (2.5ms) only.

Transmission codes

The transmission codes of the HT6221/6222 consist of a 9ms header code, a 4.5ms off code, 16-bit ad
dress codes (18ms~36ms), 9ms~18ms 8-bit data codes, and the inverse code of the 8-bit data codes. The
following is an illustration of the transmission codes:

Key-in

(K 1~K 64)

X2

DOUT

36m s m in.

Fosc=4 55kH z

4.5m s

9m s

45m s~63m s

(A 0~A15+D 0~D 7+D 0~D 7 )

108m s

Key Enables

9m s

38kH z,
33% duty carrier

2.5m s

108m s

0.56m s0.56m s

9m s

2.5m s

Output format for the DOUT

-

-

-

The output code carrier of the DOUT pin is shown in Timing 2:

38kHz

Carrier

8.77m s

26.3m s

38kHz carrier

The transmission codes employ the PPM (Pulse Position Modulation) method to represent their two
logic states by "0" (1.12ms) and "1" (2.24ms) as shown in Timing 3:

"Zero"

0.56m s

data period (1.12m s)

"O n e"

data period (2.24m s)

38kHz carrier

38kHz carrier

Logic states

6 March 2, 2000

HT6221/HT6222

·

Setting the address codes (A0~A15)

The algorithm rule of the address codes
(A0~A15) can be selected by mask option.

In this case, the 16-bit on-chip MASK ROM
(ROM1 and ROM2) are available, and the
value of ROM1 (8 bits) and ROM2 (8 bits) are
decided by one MASK LAYER. The current
value of ROM1 and ROM2 are both "00H".
The A0~A7 are set by logical OR between the

AIN

C1 C2 C3 C4 C5 C6 C7 C8

S8

(S w itc h O p e n : 0 , S w itc h C lo s e : 1 )

External S w itch S 0~S 15:

S9 S10 S11 S12 S13 S14 S15

1 0 0 0 1 1 0 0 1 0 1 0 0 1 0 0

H T6221/H T6222

external switch S0~S7 and the ROM1. The
A8~A15 equal some bits inverted to A0~A7,
the inversion are decided by Logical OR be
tween the external switch S8~S15 and the
ROM2.

For example:

The following is an illustration of these rules in
selecting the address codes (A0~A15).

200kW´8

1N 4148

S7S6S5S4S3S2S1S0

8

´

-

O n-chip R O M 1, R O M 2:

A0~A7:

A8'~A15':

A8~A15:

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

bit0 bit7 bit0 bit7

S0~S7 OR ROM1

1 0 0 0 1 1 0 0

S8~S15 O R RO M 2

1 0 1 0 0 1 0 0

A0 A1 A2 A3 A4 A5 A6 A7

1 1 0 1 0 1 1 1

Com plem ent
1 : n o n in v e rs io n
0: inversion

7 March 2, 2000

HT6221/HT6222

·

Values of the data codes (D0~D7)

The HT6221/HT6222 contain 32 and 64 ac
tive keys, respectively. Each key corresponds
to a data code. For tape deck recording, the
HT6221/HT6222 provide three double-key
functions. The double-key, single-key, and
double-key operation rules are shown in Ta
ble 3, Table 4, Timing 4, Timing 5 and Timing

6.

Table 4: K1~K64 single-key data code table

KEY

K1 0000 000 0/1 K33 0000 001 0/1

K2 1000 000 0/1 K34 1000 001 0/1

K3 0100 000 0/1 K35 0100 001 0/1

K4 1100 000 0/1 K36 1100 001 0/1

K5 0010 000 0/1 K37 0010 001 0/1

K6 1010 000 0/1 K38 1010 001 0/1

K7 0110 000 0/1 K39 0110 001 0/1

K8 1110 000 0/1 K40 1110 001 0/1

K9 0001 000 0/1 K41 0001 001 0/1

K10 1001 000 0/1 K42 1001 001 0/1

K11 0101 000 0/1 K43 0101 001 0/1

K12 1101 000 0/1 K44 1101 001 0/1

K13 0011 000 0/1 K45 0011 001 0/1

K14 1011 000 0/1 K46 1011 001 0/1

K15 0111 000 0/1 K47 0111 001 0/1

K16 1111 000 0/1 K48 1111 001 0/1

K17 0000 100 0/1 K49 0000 101 0/1

K18 1000 100 0/1 K50 1000 101 0/1

K19 0100 100 0/1 K51 0100 101 0/1

K20 1100 100 0/1 K52 1100 101 0/1

K21 0010 100 0/1 K53 0010 101 0/1

K22 1010 100 0/1 K54 1010 101 0/1

K23 0110 100 0/1 K55 0110 101 0/1

K24 1110 100 0/1 K56 1110 101 0/1

K25 0001 100 0/1 K57 0001 101 0/1

Data Codes

D0~D6

Data Code

D7

Table 3: Double-key data code table

-

-

KEY

K21+K22 1010110 0/1

K21+K23 0110110 0/1

K21+K24 1110110 0/1

Note: D7 is defined by an external switch

KEY

Data Codes

D0~D6

Data Codes

D0~D6

Data Code

D7

Data Code

D7

8 March 2, 2000

HT6221/HT6222

KEY

Data Codes

D0~D6

Data Code

D7

KEY

Data Codes

D0~D6

K26 1001 100 0/1 K58 1001 101 0/1

K27 0101 100 0/1 K59 0101 101 0/1

K28 1101 100 0/1 K60 1101 101 0/1

K29 0011 100 0/1 K61 0011 101 0/1

K30 1011 100 0/1 K62 1011 101 0/1

K31 0111 100 0/1 K63 0111 101 0/1

K32 1111 100 0/1 K64 1111 101 0/1

Note: D7 is defined by an external switch

D7=0 : connect to VDD
D7=1 : connect to VSS

K21 Input

Km Input

DOUT

K21 Input

36m s< t <126m s

36m s 108m s (m in.)

K21 code transm ission

K21

Km

36m s

(a )

K21

Data Code

D7

Km Input

DOUT

K21 Input

Km Input

DOUT

K21 Input

Km Input

DOUT

0< t <36m s

0< t <36m s

36m s< t <126m s

36m s

Km

N o transm ission

(b )

K21

Km

N o transm ission

(c )

K21

Km

36m s

108m s (m in.)

Km code transm ission

(d )

Invalid double-key input

9 March 2, 2000

HT6221/HT6222

(b)

Kn Input

DOUT

Kn Input

DOUT

K21 Input

K m In p u t

DOUT

36m s

36m s

36m s

Kn

t > 1 0 8 m s

Kn code transm ission

(a )

Kn

t <108m s

108m s

Kn code transm ission

Note: Kn can be one of K1~K64

Valid single-key input

K21

36m s

t > 1 2 6 m s

K21 code transm ission

Km

108m s (m in.)

K21+Km code

transm ission

Note: Km can be one of K22~K24

Valid double-key input

DOUT and LED

After the transmission codes are sent, the DOUT pin generates transmission codes with a carrier,
and the LED goes low to drive a transmission indicator.

10 March 2, 2000

Application Circuits

Application circuit 1

V

DD

HT6221/HT6222

1.8V~3.5V

51kW´8

330

W

100pF

X1 X2

7

D7

C1 C2 C3 C4 C5

1918171615141312123420

K1

K2

K3

K4

100pF

455kH z
ceram ic resonator

89

K5

K9

K6

K10

K7

K11

K8

K12

K13

K14

K15

K16

LED

11

LED

VDD

H T6221

C6 C7 C8 R1 R2 R3 R4

K29

K25

K21

K17

K30

K26

K22

K18

K31

K27

K23

K19

K32

K28

K24

K20

6

47mF/16V

1k

5

DOUT

VSS

AIN

In fra re d

47

W

W

8050

10

1N 4148´8

Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)

11 March 2, 2000

Application circuit 2

100pF

9

D7

11

X1 X2

100pF

455kH z
ceram ic resonator

10

V

DD

1.8V~3.5V

330

13

LED

H T6222

HT6221/HT6222

47mF/16V

W

1k

8

VDD

7

DOUT

In fra re d

47

W

W

8050

12

VSS

51kW´8

C1 C2 C3 C4 C5

2120191817161514232412345622

K9

K10

K11

K12

K41

K42

K43

K44

K13

K14

K15

K16

K45

K46

K47

K48

K1

K2

K3

K4

K33

K34

K35

K36

K5

K6

K7

K8

K37

K38

K39

K40

C6 C7 C8 R5 R6 R7 R8

K25

K21

K17

K26

K22

K18

K27

K23

K19

K28

K24

K20

K57

K53

K49

K58

K54

K50

K59

K55

K51

K60

K56

K52

R1 R2 R3 R4

K29

K30

K31

K32

K61

K62

K63

K64

1N 4148´8

AIN

Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)

12 March 2, 2000

HT6221/HT6222

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)

Holtek Semiconductor (Hong Kong) Ltd.

RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]

Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. Theapplications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

13 March 2, 2000

-