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.
-
-
-
Selection Table
Function
Part No.
HT6009504RC oscillatorTE20 DIP/SOP
HT6808406RC oscillatorTE18 DIP/SOP
HT620710044RC oscillatorD12~D1520 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.
OscillatorTriggerPackage
1April 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
VDDVSS
D ata S elect
& Buffer
Sync.
Circuit
LED C ircuit
DOUT
DOUT
LED
D12
D17
VDDVSS
Note: The address/data pins are available in various combinations.
2April 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 NameI/O
A0~A11I
AD10~AD17I
D12~D15I
DOUTOCMOS OUTEncoder data serial transmission output
LEDONMOS OUTLED transmission enable indicator
TEI
OSC1IOSCILLATOROscillator input pin
OSC2OOSCILLATOROscillator 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.
3April 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
4April 24, 2000
HT600/680/6207
Electrical Characteristics
SymbolParameter
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 Current5V
Output Drive Current
²H² Input Voltage¾¾
²L² Input Voltage¾¾
Oscillator Frequency10V
TE Pull-low Resistance5V
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
0.11
24
250500
12002400
1.53
-0.6-1.2¾
0.61.2
0.8V
0
DD
¾
¾
100
¾
¾
1.53
1.53
12V
¾
¾
V
DDV
0.2V
DD
¾
mA
mA
mA
kHz
MW
MW
mA
mA
mA
mA
V
5April 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.
6April 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
7April 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.
HT600A0~A3 A4
HT680A0~A3
HT6207A0~A3 A4
Note:
²¾² is a dummy code which is left ²open² and not bonded out.
0~3456~91011121314151617
A6~A9
¾
¾
A6~A9
A6~A9
¾¾
Address/Data Bits
AD11 AD12 AD13 AD14 AD15
¾
AD11 AD12
¾
A11D12D13D14D15
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.
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (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: 852-2-745-8288
Fax: 852-2-742-8657
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.
11April 24, 2000
-
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