LICAL-ENC-MS001 查看數據表（PDF） - Unspecified
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LICAL-ENC-MS001 Datasheet PDF : 24 Pages
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Application Example
The MS encoder is ideal for registering button presses in remote control
applications. An example application circuit is shown in the figure below.
100k
100k
To Transmitter PDN
To Transmitter
220
1 D6 LICAL-ENC-MS001 D5 20
2 D7
D4 19
3 SEL_BAUD0
4 SEL_BAUD1
D3
D2
18
17
5 GND
VCC 16
6 GND
7 GND
VCC
D1
15
14
8 TX_CNTL
9 DATA_OUT
10 MODE_IND
D0
SEND
CREATE_ADDR
13
12
11
100k
100k
100k
100k
100k
100k
220
100k
100k
Figure 13: MS Series Encoder Application Circuit
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
pulldown 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.
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