LICAL-ENC-MS001(2008) Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
LICAL-ENC-MS001 Datasheet PDF : 7 Pages
| |||
PIN ASSIGNMENTS
1 D6 LICAL-ENC-MS001 D5 20
2 D7
D4 19
3 SEL_BAUD0
D3 18
4 SEL_BAUD1
D2 17
5 GND
VCC 16
6 GND
VCC 15
7 GND
D1 14
8 TX_CNTL
9 DATA_OUT
D0
SEND
13
12
10 MODE_IND CREATE_ADDR 11
Figure 4: MS Series Encoder Pin Assignments
Pin Name
Pin Number I/O
Description
D0-D7
1, 2, 13, 14, 17-20 I
Data Input Lines
SEL_BAUD0
3
I
Baud Rate Selection Line
SEL_BAUD1
4
I
Baud Rate Selection Line
GND
5, 6, 7
—
Ground
TX_CNTL
8
O External Transmitter Control Line
DATA_OUT
9
O
Serial Data Output
MODE_IND
10
O
Mode Indicator Output
CREATE_ADDR
11
I
Create Mode Selection Line
SEND
12
I
Encoder Send Data Line
VCC
15, 16
—
Positive Power Supply
NOTE:
None of the input lines have internal pull-up or pull-down resistors. The input lines must always be in a
known state (either GND or VCC) at all times or the operation may not be predictable. The designer must
ensure that the input lines are never floating, either by using external resistors, by tying the lines directly to
GND or VCC, or by use of other circuits to control the line state.
Page 4
PIN DESCRIPTIONS
Data Lines
The encoder has eight data lines, D0 through D7. The state of these lines are
captured when the SEND line goes high and encoded for transmission. Upon
successful reception, these states are reproduced on the outputs of the decoder.
SEL_BAUD0 and SEL_BAUD1
These lines are used to
select the baud rate of the
serial data stream. The
state of the lines allows the
selection of one of four
possible baud rates, as
shown in the table.
SEL_BAUD1 SEL_BAUD0 Baud Rate (bps)
0
0
2,400
0
1
9,600
1
0
19,200
1
1
28,800
Table 3: Baud Rate Selection Table
The baud rate must be set before power up. The encoder will not recognize a
change in the baud rate setting after it is on.
GND
These lines are connected to ground.
TX_CNTL
This line goes high when the SEND line goes high, and low when the SEND line
goes low. This can be used to power up an external RF or infrared transmitter
when the encoder is sending data, and power it down when the encoder is
asleep. It can also be used to drive a LED for visual transmit indication.
DATA_OUT
The encoder will output a serial data stream on this line. This line can directly
interface with all Linx RF transmitter modules.
MODE_IND
This line is activated while the encoder is in Create Mode, allowing the
connection of a LED indicator. The LED will stay on for the entire time the
encoder is in Create Mode, indicating that the encoder is creating a new Code
Word.
CREATE_ADDR
When this line is taken high, the encoder will enter Create Mode and randomly
generate a new Code Word. This word will be continuously randomized while
this line is high, and will be saved as soon as this line is taken low.
SEND
When this line goes high, the encoder will record the states of the data lines,
retrieve the secure Code Word from memory, assemble the packet, and send it
as a serial bit stream out of the DATA_OUT line at the baud rate selected by the
states of the SEL_BAUD lines.
VCC
This is the positive power supply.
Page 5
Share Link: 