Holtek Semiconductor Inc HT600, HT6207, HT680 Datasheet

Features

Operating voltage: 2.4V~12V

·

Low power and high noise immunity CMOS

·

technology
Low standby current

·

Three words transmission

·

Built-in oscillator needs only 5% resistor

·

Applications

Burglar alarm system

·

Smoke and fire alarm system

·

Garage door controllers

·

Car door controllers

·

General Description

The 318encoders are a series of CMOS LSIs for
remote control system applications. They are
capable of encoding 18 bits of information
which consists of N address bits and 18-N data
bits. Each address/data input is externally
trinary programmable if bonded out. It is other­wise set floating internally. Various packages of

18

the 3

encoders offer flexible combinations of

HT600/680/6207

18

3

Series of Encoders

Easy interface with an RF or infrared trans

·

mission media
Minimal external components

·

Package information: refer to Selection

·

Table

Car alarm system

·

Security system

·

Cordless telephones

·

Other remote control systems

·

programmable address/data to meet various
application needs. The programmable ad
dress/data is transmitted together with the
header bits via an RF or an infrared transmis
sion medium upon receipt of a trigger signal.
The capability to select a TE trigger type or a
DATA trigger type further enhances the appli­cation flexibility of the 3

18

series of encoders.

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-

-

Selection Table

Function

Part No.

HT600 9 5 0 4 RC oscillator TE 20 DIP/SOP

HT680 8 4 0 6 RC oscillator TE 18 DIP/SOP

HT6207 10 0 4 4 RC oscillator D12~D15 20 DIP/SOP

Note: Address/Data represents addressable pins or data according to the decoder requirements.

Address

No.

Address/
Data No.

Data

No.

Dummy

Code No.

Oscillator Trigger Package

1 April 24, 2000

Block Diagram

TE trigger

HT600/HT680

OSC2

HT600/680/6207

OSC1

TE

A0

Transm ission

A9

AD10

DATA trigger

HT6207

OSC2

A0

Transm ission

A11

O scillator

18

G a te C irc u it

AD17

OSC1

O scillator

18

G a te C irc u it

33 D ivider

¸

18 C ounter

¸

& 1 of 18

D ecoder

Trinary

Detector

33 D ivider

¸

18 C ounter

¸

& 1 of 18

D ecoder

Trinary

Detector

D ata S elect

& Buffer

Sync.

Circuit

VDD VSS

D ata S elect

& Buffer

Sync.

Circuit

LED C ircuit

DOUT

DOUT

LED

D12

D17

VDD VSS

Note: The address/data pins are available in various combinations.

2 April 24, 2000

Pin Assignment

HT600/680/6207

TE trigger type

9-Address
5 -A d d re s s /D a ta

1

AD11

2

AD12

3

AD13

4

AD14

5

AD15

DOUT

OSC2

OSC1

TE

VSS

6

7

8

9

10

HT600

20 D IP /S O P

8-Address
4-A ddress/D ata

VDD

20

19

A9

18

A8

17

A7

16

A6

A4

15

A3

14

A2

13

A1

12

11

A0

DOUT

OSC2

OSC1

AD11

AD12

AD14

AD15

TE

VSS

1

2

3

4

5

6

7

8

9

VDD

18

A9

17

16

A8

15

A7

14

A6

A3

13

A2

12

A1

11

A0

10

HT680

18 D IP /S O P

DATA trigger type

10-A ddress
4 -D a ta

A11

1

2

D12

3

D13

4

D14

5

D15

DOUT

LED

OSC2

OSC1

VSS

6

7
8

9

10

H T6207

20 DIP/SO P

20

VDD

19

A9

18

A8

17

A7

16

A6

A4

15

A3

14

A2

13

12

A1

11

A0

Pin Description

Pin Name I/O

A0~A11 I

AD10~AD17 I

D12~D15 I

DOUT O CMOS OUT Encoder data serial transmission output

LED O NMOS OUT LED transmission enable indicator

TE I

OSC1 I OSCILLATOR Oscillator input pin

OSC2 O OSCILLATOR Oscillator output pin

VSS

VDD

¾¾

¾¾

Internal

Connection

TRANSMISSION

GATE

TRANSMISSION

GATE

CMOS IN

Pull-low

CMOS IN

Pull-low

Description

Input pins for address A0~A11 setting
They can be externally set to VDD, VSS, or left open.

Input pins for address/data (AD10~AD17) setting
They can be externally set to VDD, VSS, or left open.

Input pins for data (D12~D15) setting and transmission
enable (active high)
They an be externally set to VDD or left open (see Note).

Transmission enable, active high (see Note).

Negative power supply, ground

Positive power supply

Note: D12~D15 are data input and transmission enable pins of the HT6207.

TE is the transmission enable pin of the HT600/HT680.

3 April 24, 2000

Approximate internal connections

HT600/680/6207

TRANSM ISSION

GATE

OSCILLATOR

EN

OSC1

CMOS IN
Pull-low

OSC2

CMOS O UT

NMOS O UT

Absolute Maximum Ratings

Supply Voltage ...............................-0.3V to 13V

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

-0.3 to VDD+0.3V

SS

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² 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

4 April 24, 2000

HT600/680/6207

Electrical Characteristics

Symbol Parameter

V

DD

I

STB

I

DD

I

LED

I

DOUT

V

IH

V

IL

f

OSC

R

TE

R

DATA

Operating Voltage

Standby Current

Operating Current

LED Sink Current 5V

Output Drive Current

²H² Input Voltage ¾¾

²L² Input Voltage ¾¾

Oscillator Frequency 10V

TE Pull-low Resistance 5V

D12~D17 Pull-low
Resistance

Test Conditions

V

DD

Conditions

¾¾

3V

Oscillator stops

12V

5V

No load

=100kHz

f

OSC

12V

V

=0.5V

LED

V

5V

5V

5V

=0.9VDD(Source)

OH

V

=0.1VDD(Sink)

OL

=330kW¾

R

OSC

V

=5V

TE

=5V

V

DATA

Ta=25°C

Min. Typ. Max. Unit

2.4

¾

¾

¾

¾

¾

0.1 1

24

250 500

1200 2400

1.5 3

-0.6 -1.2 ¾

0.6 1.2

0.8V

0

DD

¾

¾

100

¾

¾

1.5 3

1.5 3

12 V

¾

¾

V

DD V

0.2V

DD

¾

mA

mA

mA

kHz

MW

MW

mA

mA

mA

mA

V

5 April 24, 2000

HT600/680/6207

Functional Description

Operation

18

The 3
able (TE for the HT600/HT680 or D12~D15 for the HT6207, active high). This cycle will repeat itself
as long as the transmission enable (TE or D12~D15) is held high. Once the transmission enable falls
low, the encoder output completes its final cycle and then stops as shown below.

Information word

An information word consists of four periods as shown:

series of encoders begins a three-word transmission cycle upon receipt of a transmission en

TE or

D 12~D 15

Encoder

Data Out

< 1 w ord

3 w ords

Transm itted

C ontinuously

3 w ords

Transmission timing

-

1/6 bit

Pilot period

(6 b its )

Sync. period

Address code period

D ata code period

Composition of information

Address/data waveform

Each programmable address/data pin can be externally set to one of the following three logic states:

fosc ¸ 33

"O n e"

"Zero"

"O pen"

Address/D ata Bit

Address/Data bit waveform

The ²Open² state data input is interpreted as logic low by the decoders since the decoder output only
have two states.

6 April 24, 2000

HT600/680/6207

Address/data programming (preset)

The status of each address/data pin can be individually preset to logic ²high², ²low²,or²floating².Ifa
transmission enable signal is applied, the encoder scans and transmits the status of the 18 bits of ad
dress/data serially in the order A0 to AD17 for the HT600/HT680 and A0 to D15 for the HT6207.

There are some packaging limitations. For example t he 18-pin DIP HT680, offers four external data
bits and eight external address bits. The remaining unpackaged bits or dummy codes are treated as
floating for A0~AD17 or as pull-low for D12~D15. During an information transmission these bits are
still located in their original position. But if the trigger signal is not applied, the chip only consumes a
standby current which is less than 1mA.

The address pins are usually preset to transmit data codes with particular security codes by the DIP
switches or PCB wiring, while the data is selected using push buttons or electronic switches.

The following figure shows an application using the HT680:

-

VSSA0A1A2A3A6A7A8A9

The transmitted information is as shown:

Pilot

A1ZA20A31A4ZA5

&

Sync.A00

AD12ZAD13ZAD14ZAD151AD16ZAD17

¾

Z: floating

OSC1 OSC2

VDD

TE AD 11 A D 12 A D 14 A D 15

DOUT

Transm ission

V

DD

A61A7ZA80A90AD10ZAD11

Z

Z

m edium

Z

7 April 24, 2000

HT600/680/6207

Address/Data sequence

The following provides a table of address/data sequence for various models of the 3
correct device should be selected according to the individual address and data requirementss.

Part No.

HT600 A0~A3 A4

HT680 A0~A3

HT6207 A0~A3 A4

Note:

²¾² is a dummy code which is left ²open² and not bonded out.

0~3 4 5 6~9 10 11 12 13 14 15 16 17

A6~A9

¾

¾

A6~A9

A6~A9

¾¾

Address/Data Bits

AD11 AD12 AD13 AD14 AD15

¾

AD11 AD12

¾

A11 D12 D13 D14 D15

¾

¾

AD14 AD15

²²is a dummy code which is set low and not bonded out.

Transmission enable

For the TE trigger type of encoders, transmission is enabled by applying a high signal to the TE pin.
But for the Data trigger type of encoders, it is enabled by applying a high signal to one of the data
pins D12~D15.

Flowchart

Pow er on

18

series encoders. A

¾¾

¾¾

Standby m ode

No

No

Transm ission

enabled ?

Yes

3 data w ords

transm itted

Transm ission

still enabled ?

Yes

3 data w ords

transm itted

continuously

Note: D12~D15 are transmission enables of the HT6207.

TE is the transmission enable of the HT600/HT680.

8 April 24, 2000

Oscillator frequency vs supply voltage

fosc

(Scale)

3.00

HT600/680/6207

W

Rosc (

)

2.75

2.50

2.25

2.00

1.75

1.50

1.25

(100kHz) 1.00

0.75

0.50

0.25

2345678910111212.5

The recommended oscillator frequency is f

OSCD

(decoder) @ f

OSCE

120k

150k

180k

220k

270k

330k

390k
470k

560k
680k

820k
1M

1.5M
2M

(encoder)

V

DD

(V D C )

9 April 24, 2000

Application Circuits

HT600/680/6207

Transm itter C ircuit

1

AD11

2

AD12

3

AD14

4

AD15

5

DOUT

6

TE

7

OSC2

Rosc

8

OSC1

9

VSS

1k

W

Rosc

10

18

VDD

17

A9

16

A8

15

A7

14

A6

13

A3

12

A2

11

A1

10

A0

HT680

Transm itter C ircuit

1

A11

VDD

2

3

4

5

6

7

8

9

D12

D13

D14

D15

DOUT

LED

OSC2

OSC1

VSS

A9

A8

A7

A6

A4

A3

A2

A1

A0

HT6207

V

DD

Transm itter C ircuit

1

2

3

4

5

6

7

8

Rosc

9

10

AD11

AD12

AD13

AD14

AD15

DOUT

TE

OSC2

OSC1

VSS

VDD

A9

A8

A7

A6

A4

A3

A2

A1

A0

V

DD

20

19

18

17

16

15

14

13

12

11

HT600

V

DD

20

19

18

17

16

15

14

13

12

11

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

Typical RF transmitter: JR-220 (JUWA CORP.)

TX-99 (MING MICROSYSTEM, U.S.A.)

10 April 24, 2000

HT600/680/6207

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 ã 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. The applications 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.

11 April 24, 2000

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