HT6026
Remote Control Encoder
Pin Assignment
Block Diagram
General Description
The HT6026 is a CMOS LSI encoder designed for
use in remote control system. It is capable of
encoding 9 bits of information which consists of N
address bits and 9N data bits. Each address/data
input is externally trinary programmable by ex-
ternal switches. The programmable address/data
is transmitted along with the header bits via an
RF or an infrared transmission medium upon
receipt of a trigger signal (TE).
The HT6026 is pin compatible with the
MC145026.
Features
Operating voltage: 4V~18V
Low standby current
Low power and high noise immunity CMOS
technology
3
9
difference codes
Two transmission words minimum
Built-in oscillator needs only 5% resistor
Interface with RF or infrared transmission
medium
Minimal external components
Applications
Burglar alarm system
Smoke and fire alarm system
Garage door controllers
Car alarm system
Security system
Cordless telephones
Other remote control systems
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2nd Oct '97
Pad Coordinates
Unit:
m
Pad
No.
X
Y
Pad
No.
X
Y
1
598.00
689.00
9
160.00
687.00
2
674.00
433.00
10
670.00
687.00
3
674.00
126.00
11
670.00
347.00
4
674.00 162.00
12
670.00
172.00
5
674.00 449.00
13
670.50
689.50
6
598.00 687.00
14
270.00
689.00
7
342.00 687.00
15
84.00
689.00
8
127.00 687.00
16
299.00
689.00
Chip size: 1650
1680 (
m)
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Pin Description
Pin No.
Pin Name
I/O
Internal
Connection
Description
1~7
AD0~AD6
I
TRANSMISSION
GATE
Input pins for address/data AD0~AD6 setting
They can be externally set to VDD, VSS, or left
open
8
VSS
I
--
Negative power supply (GND)
9~10
AD7~AD8
I
TRANSMISSION
GATE
Input pins for address/data AD7~AD8 setting
They can be externally set to VDD, VSS, or left
open
11
OSC1
I
OSCILLATOR
Oscillator input pin
12
OSC2
O
OSCILLATOR
Oscillator output pin
13
OSC3
O
OSCILLATOR
Oscillator output pin
14
TE
I
CMOS IN
Pull-High
Transmission enable, active low
15
DOUT
O
CMOS OUT
Encoder data serial transmission output
16
VDD
--
Positive power supply
HT6026
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2nd Oct '97
Approximate internal connection circuits
Absolute Maximum Ratings*
Supply Voltage ............................... 0.3V to 24V
Storage Temperature................. 50
C to 125
C
Input Voltage.................... V
SS
0.3 to V
DD
+0.3V
Operating Temperature............... 20
C to 75
C
*Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent
damage to the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extened
periods may affect device reliability.
Electrical Characteristics
(Ta=25
C)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
--
--
4
--
18
V
I
STB
Standby Current
5V
Oscillator stops
--
0.1
0.3
A
15V
--
0.1
0.5
A
I
DD
Operating Current
5V
No load, F
OSC
=18kHz
--
500
900
A
15V No load, F
OSC
=22kHz
--
2000
3000
A
I
DOUT
Output Drive Current
5V
V
OH
=0.9V
DD
(Source)
1.0
1.7
--
mA
15V
8.0
14.0
--
mA
5V
V
OL
=0.1V
DD
(Sink)
0.8
1.5
--
mA
15V
5.0
10.0
--
mA
V
IH
"H" Input Voltage
--
--
0.7V
DD
--
V
DD
V
V
IL
"L" Input Voltage
--
--
0
--
0.3V
DD
V
R
TE
TE Pull-High Resistance
5V
V
TE
=0V
--
800
--
k
15V
--
250
--
k
F
OSC
Oscillator Frequency
5V
R
EXT
=10k
C
EXT
=2000PF
R
S=
20k
--
18
--
kHz
15V
--
22
--
kHz
HT6026
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2nd Oct '97
Functional Description
Operation
The HT6026 encoder begins a one-word transmission cycle upon receipt of a transmission enable (TE,
active low). This cycle will repeat itself as long as the transmission enable (TE ) is held low. Once the
transmission enable returns high, the encoder output completes its final N
2 word cycle, and then
stops as shown in Figure 1. The total number of transmission cycles allowed is always adjusted to an
even number automatically.
Information word
An information word consists of 2 periods as shown:
Address/data waveform
Each programmable address/data pin can be externally set to one of the following three logic states:
Figure 2. Composition of information
Figure 3. Address/Data bit waveform
Figure 1. Transmission timing
HT6026
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2nd Oct '97
The transmitted information is as listed:
Pilot
&
Sync.
AD0
1
AD1
Z
AD2
1
AD3
Z
AD4
Z
AD5
Z
AD6
0
AD7
1
AD8
Z
Z: floating
Address/data programming (preset)
The status of each address/data pin can be indi-
vidually pre-set to logic "high", "low", or "float-
ing". If a transmission enable signal is applied,
the encoder scans and transmits the status of
9-bit address/data serially in the order AD0 to
AD8. But if the trigger signal is not applied, the
chip only consumes a standby current which is
less than 1
A (for VDD=5V).
The address pins are usually pre-set to transmit
data codes with their own particular security
codes by the DIP switches or PCB wiring, while
the data is selected by the push button or elec-
tronic switches.
The following figure demonstrates an applica-
tion using the HT6026:
HT6026
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2nd Oct '97
Transmission enable
Transmission is enabled by applying a low signal to the TE pin. The HT6026 is enabled and outputs
address/data codes from DOUT pin when the TE is set to "low" and more than 65ns.
Flowchart
Oscillator frequency vs supply voltage
HT6026
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2nd Oct '97
Application Circuit
Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)
Typical RF transmitter: JR-220 (JUWA CORP.)
HT6026
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2nd Oct '97
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