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| 型号： | CMD-HHTX-433 |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 2/5页 |
| 文件大小： | 0K |
| 描述： | XMITTER HANDHELD 433MHZ 8 BUTTON |
| 产品变化通告： | CMD-HHTX-xxx Performance Change 01/Oct/2010 |
| 产品目录绘图： | CMD-HHTX-xxx |
| 标准包装： | 25 |
| 功能： | 发射器 |
| 调制或协议： | ASK，OOK |
| 频率： | 433MHz |
| 应用： | 通用遥控系统，车库门开启器，RKE |
| 接口： | 手持型，8 按钮 |
| 数据传输率 - 最大： | 1.2 kbps |
| 特点： | 8 按钮，1000 英尺 工作距离 |
| 电源电压： | 2.1 V ~ 3.6 V |
ELECTRICAL SPECIFICATIONS
SETTING THE TRANSMITTER ADDRESS
Parameter
POWER SUPPLY
Operating Voltage
Supply Current
Power-Down Current
TRANSMITTER SECTION
Transmit Frequency Range:
CMD-HHTX-315
CMD-HHTX-418
CMD-HHTX-433
Center Frequency Accuracy
Designation
V CC
I CC
I PDN
F C
–
Min.
2.1
–
–
–
–
–
-50
Typical
3.0
3.4
5.0
315
418
433.92
–
Max.
3.6
–
–
–
–
–
+50
Units
VDC
mA
nA
MHz
MHz
MHz
kHz
Notes
–
–
1
–
–
–
–
The OEM Handheld transmitter allows
the selection of one of 256 unique
addresses. All transmitters are supplied
set to the same address. To avoid
contention with other units or to create
unique relationships, the address can
be changed. This is accomplished using
internal DIP switches as shown. The
switches are accessed by removing the
rear cover as for battery replacement.
If the switch is on, the address line is
A0 = 8
A1 = 7
A2 = 6
A3 = 5
A4 = 4
A5 = 3
A6 = 2
A7 = 1
ON OFF
ENVIRONMENTAL
connected to ground, otherwise it is
Figure 2: DIP Switch Assignments
Operating Temperature Range
–
-30
–
+70
°C
1
floating. The receiver’s address must
Notes
1. Characterized, but not tested
THEORY OF OPERATION
The CMD-HHTX-*** OEM Handheld transmitter combines the LC Series
transmitter and Splatch planar antenna with an on-board Holtek HT640 encoder
IC to form a simple, yet highly reliable, RF remote-control transmitter. The LR
Series transmitter is a low-cost, SAW-based ASK / OOK transmitter.
When a button is pressed on the transmitter, power is applied to the internal
circuitry and the encoder IC is enabled. The encoder detects the logic states of
match exactly in order for the units to communicate. Application Note AN-00300
describes in detail how to set the address to match any of the receivers offered
by Linx. This note can be found in the Support section of the Linx web site,
www.linxtechnologies.com.
CMD-HHTX BUTTON ASSIGNMENTS
This diagram illustrates the relationship between the button locations and
encoder data lines.
the address lines and button data lines. These states are formatted into a three-
word transmission cycle that continues until the button is released. The encoder
data is used to modulate the transmitter, which, through the antenna, conveys
the data into free space. On the receiver side, a decoder IC or custom
microcontroller is used to check the transmitter’s address bits against the
address settings of the receiving device. If a match is confirmed, the decoder’s
outputs are set to replicate the transmitter’s button states. These outputs can
then be used to activate external circuitry required by the application.
The transmitter is compatible with several Linx receiver products, including the
LR, KH2, LT, and OEM product families. For applications where range is critical,
the LR Series receiver is the best choice due to its outstanding sensitivity. When
the transmitter is combined with an LR Series receiver and the HT658 decoder
chip, ranges of up to 1,000 feet are possible. Applications operating over shorter
distances will also benefit from the increased link reliability and superior noise
D7
D5
D3
D1
D6
D4
D2
D0
immunity provided by the LR Series receiver.
Figure 3: CMD-HHTX-*** Button Assignments
Page 2
Page 3
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