LICAL-ENC-MS001 Linx Technologies Inc, LICAL-ENC-MS001 Datasheet - Page 6
![IC ENCODER MS SERIES 20-SSOP](/photos/7/64/76499/343-20-ssop_sml.jpg)
LICAL-ENC-MS001
Manufacturer Part Number
LICAL-ENC-MS001
Description
IC ENCODER MS SERIES 20-SSOP
Manufacturer
Linx Technologies Inc
Series
MSr
Type
Encoderr
Datasheet
1.LICAL-ENC-MS001.pdf
(7 pages)
Specifications of LICAL-ENC-MS001
Package / Case
20-SSOP
Applications
RF, IR
Mounting Type
Surface Mount
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LICAL-ENC-MS001
Manufacturer:
LINX
Quantity:
320
Company:
Part Number:
LICAL-ENC-MS001
Manufacturer:
LinxTechnologies
Quantity:
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Figure 7: MS Series Encoder Application Circuit
Page 10
APPLICATION EXAMPLE
To Transmitter PDN
The MS encoder is ideal for registering button presses in remote control
applications. An example application circuit is shown in the figure below.
In this circuit, SPDT switches are used to select the baud rate so that pull-down
resistors are not needed. The data lines are connected to buttons and when any
button is pressed, the SEND line is pulled high and causes the encoder to
transmit. The diodes are used to prevent the voltage on one data line from
appearing on another data line.
If only one data line is needed, then it can be tied directly to the SEND line
without the need for the diodes.
None of the inputs have pull-up or pull-down resistors internally, so 100kΩ pull-
down resistors are used on the data lines, SEND, and CREATE_ADDR. These
resistors are used to pull the lines to ground when the buttons are not being
pressed and ensure that they are always in a known state and not floating.
Without these resistors, the state of the lines could not be guaranteed and
encoder operation may not be predictable.
A LED indicator is attached to the MODE_IND line to provide visual feedback to
the user that an operation is taking place. This line will source a maximum of
25mA, so the limiting resistor may not be needed, depending on the LED chosen
and the brightness desired.
Outgoing encoded data will be sent out of the DATA_OUT line at the baud rate
determined by the state of the SEL_BAUD lines. This line can be connected
directly to the DATA_IN line of a Linx transmitter, used to modulate an infrared
diode, or connected to any other serial transmission medium.
The TX_CNTL line is connected to the PDN line of a Linx transmitter so that the
module will enter a low power state when not in use. A LED can also be
connected to the TX_CNTL line to provide visual indication that the encoder is
sending data.
In this example, the data lines are pulled high by simple pushbutton switches, but
many other methods may be employed. Trace contacts, reed switches or
microcontrollers are just some examples of other ways of pulling the data lines
high. The flexibility of the encoder combined with the associative options of the
matching decoder opens a whole new world of options for creative designers.
To Transmitter
220
100k
100k
10
1
2
3
4
5
6
7
8
9
D6
D7
SEL_BAUD0
SEL_BAUD1
GND
GND
GND
TX_CNTL
DATA_OUT
MODE_IND
LICAL-ENC-MS001
CREATE_ADDR
SEND
VCC
VCC
D5
D4
D3
D2
D1
D0
20
19
18
17
16
15
14
13
12
11
100k
100k
100k
100k
100k
100k
100k
100k
220
SYSTEM EXAMPLE
ONLINE RESOURCES
www.linxtechnologies.com
The first step in using the encoder is to set the baud rate using the SPDT
switches. Next, a unique Code Word is created by pressing and holding the
button connected to the CREATE_ADDR line for as long as desired. While the
button is held, the LED will be on indicating that the Code Word is being created.
Once the button is released, the LED will start flashing. The data buttons that the
encoder is to access are now pressed. Pressing the CREATE_ADDR button
again makes the encoder save the new Code Word and Control Permissions,
turn off the LED, and go to sleep.
The decoder must now learn the Code Word for the system to be operational.
Please see the decoder design guide for instructions on how to do this. The MS
Series Master Development System implements this system, so please see the
User’s Guide for the kit for more system information and circuit schematics.
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