Ordering information, Electrical specifications, Theory of operation – Linx Technologies OTX-xxx-HH-KF-MS User Manual

Page 4: Electrical specifications ordering information

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Ordering Information

Part Number

Description

OTX-***-HH-KF#-MS-xxx

MS Keyfob Transmitter

MDEV-***-HH-KF-MS

MS Keyfob Development System

# = Number of Buttons, 1 to 5
*** = 418 (Standard) or 433MHz
xxx = Color (Leave blank for standard black)
WHT = White
CRE = Red
CGY = Gray

Keyfob Electrical Specifications

Parameter

Designation Min.

Typ.

Max.

Units

Notes

Power Supply

Operating Voltage

V

CC

2.3

3.0

3.6

VDC

Supply Current

l

CC

12.6

mA

Power-Down Current

l

PDN

1.5

µA

1

Transmitter Section

Transmit Frequency Range

F

C

OTX-418-HH-KF#-MS

418

MHz

OTX-433-HH-KF#-MS

433.92

MHz

Center Frequency Accuracy

–8

+8

kHz

Data Rate

9,600

bps

Environmental

Operating Temperature Range

0

+70

°C

1

1. Characterized, but not tested

Electrical Specifications

Ordering Information

Figure 3: Ordering Information

Figure 4: Electrical Specifications

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 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, an 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 states. These outputs
can then be used to activate external circuitry required by the application.

The transmitter is compatible with the LT and LR product families. When
the Keyfob transmitter is combined with an LR Series receiver and MS
Series decoder, ranges of up to 750 feet are possible. Applications
operating over shorter distances will also benefit from the increased link
reliability and superior noise immunity provided by the LR receiver.

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