User's Manual
RECEIVERS
There are four options for receivers within the Linx
product line. The first option is to use one of the OEM
Function Modules, such as the Relay Module or the AC
Wall Module. These items are also pre-certified and
can be immediately included in a product.
The other options are to use one of the Linx receiver
modules. The signal sent by the Long Range Hand
Held transmitter can be received by the LC Series
receiver module or, for longer range, the LR Series
receiver module. These modules can be connected to
the Holtek HT658 decoder to decode the signal or a
custom microcontroller can be programmed to decode
it and take specific action.
The KH Series offers a slightly simpler solution by
combining the LC Series receiver and the HT658
decoder in a single package.
The basic operation for the system is that when a
button is pressed on the transmitter, a corresponding
pin on the decoder will go high (as long as the
addresses match). This can then be connected to
whatever circuitry is required by the application
Application Note AN00300 discusses in detail how to
set the addresses on all of the units. Data guides for all
of the receivers, the HT640 encoder, and the HT658
decoder can be found on the Linx Technologies web
site, www.linxtechnologies.com.
TYPICAL APPLICATIONS
The outstanding sensitivity of the
LR Series receiver offers the best
range when used with the Hand
Held transmitter. When using the
LR Series receiver, the Holtek
HT658 decoder chip should be
used to decode the received signal.
This decoder has ten address lines
that must match the transmitter
address lines. A DIP switch is
commonly used to set these, but
they can also be hardwired. If the
address lines match, when a button
on the transmitter is pressed a
corresponding data line on the
decoder (D0-D7) will go high.
These data lines can then be
connected to external circuitry to
perform whatever function is
required by the application.
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VCC
R1
390K
SW1
1
SW2
2
SW3
3
SW4
4
SW5
5
SW6
6
SW7
7
SW8
8
COM
9
SM1
R2
100K
VCC
1
23
4
U3
DPAK-X2
1
23
4
U2
DPAK-X2
1
23
4
U4
DPAK-X2
1
23
4
U5
DPAK-X2
D1
1
D2
2
D3
3
D4
4
D5
5
D6
6
D7
7
DOUT
8
TE
9
OSC1
10
OSC2
11
GND
12
A0
13
A1
14
A2
15
A3
16
A4
17
A5
18
A6
19
A7
20
A8
21
A9
22
D0
23
VCC
24
U1
HT-640
1
2
3
20
19
18
4
5
6
17
16
15
7
8
9
14
13
12
1011
S1
SW-USMT-10
GND
GND
GND
VCC
GND
R3
Set For FCC
Compliance
GND
1
DATA IN
2
GND
3
IADJ/VCC
4
RF OUT
5
GND
6
VCC
7
PDN
8
TX1
LRTX
GND
GND
VCC
VCC
GND
B1
BAT-LINX2032
ANT1
ANTENNA
Figure 6: CMD-HHLR-xxx Schematic
G
N
D
R1
390k
G
N
D
G
N
D
V
CC
V
CC
D1
1
D2
2
D
3
3
D4
4
D
5
5
D
6
6
D7
7
VT
8
DIN
9
OSC1
1
0
OSC2
11
G
N
D
12
A
0
1
3
A
1
14
A
2
1
5
A
3
1
6
A4
17
A
5
1
8
A
6
1
9
A7
2
0
A
8
21
A
9
22
D
0
2
3
V
CC
24
HT
658
N
C
1
N
C
2
N
C
3
G
N
D
4
V
CC
5
PDN
6
R
SSI
7
DATA
8
N
C
9
N
C
1
0
N
C
11
N
C
12
N
C
1
3
N
C
14
G
N
D
1
5
ANT
1
6
RXM-XXX-LR-
S
G
N
D
Figure 6: LR Receiver and HT658 Schematic