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ELECTRICAL SPECIFICATIONS
SETTING THE TRANSMITTER ADDRESS
The Keyfobs are all supplied from the
Parameter
Designation
Min.
Typical
Max.
Units
Notes
factory with a default address and all
POWER SUPPLY
buttons authorized. The address is
Operating Voltage
V CC
2.1
3.0
3.6
VDC
–
changed by using a paper clip or probe
Supply Current
Power-Down Current
I CC
I PDN
–
–
3.4
5.0
–
–
mA
nA
–
1
to press the CREATE_ADDR button on
the board through the hole in the back
CREATE_ADDR
Button Access
TRANSMITTER SECTION
of the case. When the button is
Transmit Frequency Range:
F C
depressed, a LED will light up in the
OTX-315-HH-KF#-MS
OTX-418-HH-KF#-MS
–
–
315
418
–
–
MHz
MHz
–
–
MODE_IND window, indicating that the
address is being created. The address
OTX-433-HH-KF#-MS
Center Frequency Accuracy
–
–
-50
433.92
–
–
+50
MHz
kHz
–
–
will be randomized for as long as the
button is held down. When the button is
Figure 2: CREATE_ADDR Button Access
Data Rate
–
–
9,600
–
bps
–
released, the randomized address is saved and the LED will begin flashing to
ENVIRONMENTAL
indicate that the Control Permissions may now be set. Press the buttons that the
Operating Temperature Range
–
-40
–
+85
° C
1
Keyfob user will have the authority to access. Press the CREATE_ADDR button
with the paper clip again or wait 17 seconds for it to time out. The address and
Notes
1. Characterized, but not tested.
THEORY OF OPERATION
The MS Series Keyfob Transmitter combines a high-performance synthesized
transmitter with an on-board MS Series encoder IC to form a highly reliable, yet
cost-effective RF remote control transmitter. The transmitter’s advanced
synthesized architecture delivers superior stability and frequency accuracy while
minimizing the effects of temperature and body proximity.
The advanced MS Series encoder has several advantages over previous
solutions. It provides more security by offering 2 24 addresses, which is several
orders of magnitude greater than older encoders. Furthermore, the address is
Control Permissions are now set. The decoder will need to learn the address
before it will accept any transmissions. Please see the Typical Applications
section of this data guide or the MS Series Decoder Data Guide for details.
BUTTON ASSIGNMENTS
The Keyfob is available in five button configurations. Those configurations and
the corresponding switch numbers are shown in the figure below. The table
shows which encoder data line has been assigned to each switch. When a
button is pressed, the data line will go high, causing the corresponding data line
on the decoder to go high if the address has been learned.
instantly established with a simple button press, eliminating cumbersome DIP
switches and cut traces. When paired with a MS Series decoder, keyfob identity
can be determined and distinct transmitter-receiver relationships established.
The Keyfob operates in the following manner: when a button is pressed on the
Keyfob, power is applied to the internal circuitry and the encoder IC is enabled.
The encoder then detects the logic states of the button data lines. The encoder
data is used to modulate the transmitter, which, through the antenna, conveys
the data into free space. The transmission cycle continues until the button is
released. On the receiver side, a MS Series decoder IC is used to check the
transmitter’s address bits against the address saved in memory. If a match is
confirmed, and if the decoder has permission to recognize the specific button
being pressed, the decoder’s outputs are set to replicate the transmitter’s button
S5
S4
S2
Button
S1
S4
S5
S2
Data Line
D0
states. These outputs can then be used to activate external circuitry required by
S4
S4
S2
D1
the application.
The transmitter is compatible with the LT and LR product families. For
applications where range is critical, the LR Series receiver is the best choice due
S1
S2
S3
S1 S5 S3
S2
S3
S4
D2
D3
to its outstanding sensitivity. When the Keyfob transmitter is combined with an
LR Series receiver and MS Series decoder, ranges of up to 750 feet are
S5
D4
possible. Applications operating over shorter distances will also benefit from the
increased link reliability and superior noise immunity provided by the LR receiver.
Page 2
Figure 3: OTX-***-HH-KF#-MS Button Assignments
Page 3
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