Receivers, Typical applications – Linx Technologies CMD-HHTX-xxx User Manual
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2
3
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8
16
15
14
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11
10
9
S1
ADDRESS
VCC
R1
3
9
0K
GND
1
DATAIN
2
GND
3
IADJ/GND
4
RFOUT
5
GND
6
VCC
7
GND
8
TX1
TXM-xxx-LC
VCC
SW1
1
SW2
2
SW3
3
SW4
4
SW5
5
SW6
6
SW7
7
SW8
8
COM
9
SM1
RFIN
1
GND
2
GND
3
GND
4
GND
5
GND
6
ANT1
SPLATCH ANTENNA
B1
CR2032
R2
100K
VCC
1
2
3
4
U3
DPAK-X2
1
2
3
4
U2
DPAK-X2
1
2
3
4
U4
DPAK-X2
1
2
3
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
1
9
A7
20
A8
21
A
9
22
D0
23
VCC
24
U1
HT-640
VCC
GND
GND
GND
GND
GND
GND
Figure 7: CMD-HHTX-*** Schematic
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 OEM Handheld
transmitter can be received by the LR Series receiver
module or the LT Series transcever 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 KH2 Series offers a slightly simpler solution by
combining the LR Series receiver and the HT658
decoder in a single package.
When a button is pressed on the transmitter, a
corresponding line 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 AN-00300 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
website, www.linxtechnologies.com.
TYPICAL APPLICATIONS
The outstanding sensitivity of the
LR Series receiver offers the best
range when used with the
Handheld 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.
GND
R1
390k
GND
GND
VCC
VCC
D1
1
D2
2
D3
3
D4
4
D5
5
D6
6
D7
7
VT
8
DIN
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
HT658
NC
1
NC
2
NC
3
GND
4
VCC
5
PDN
6
RSSI
7
DATA
8
NC
9
NC
10
NC
11
NC
12
NC
13
NC
14
GND
15
ANT
16
RXM-LR
GND
Figure 6: LR Receiver and HT658 Schematic