LICAL-TRC-MT(2008) 查看數據表（PDF） - Unspecified
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LICAL-TRC-MT Datasheet PDF : 15 Pages
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PIN ASSIGNMENTS
1 VCC LICAL-TRC-MT GND 20
2 D6
D5 19
3 D7
D4 18
4 CRT/LRN
D3 17
5 ENC_SEL
LATCH 16
6 SER_IO
SEL_BAUD 15
7 CONFIRM
MODE_IND 14
8 TR_PDN
D2 13
9 TR_SEL
D1 12
10 TR_DATA
D0 11
Figure 4: MT Series Transcoder Pin Assignments
Pin Name
VCC
D0-D7
CRT/LRN
ENC_SEL
SER_IO
CONFIRM
TR_PDN
TR_SEL
TR_DATA
MODE_IND
SEL_BAUD
LATCH
GND
Pin Number
1
2, 3, 11-13, 17-19
4
5
6
7
8
9
10
14
15
16
20
I/O
Description
—
Positive Power Supply
I/O
Status Control Lines
I Create / Learn Mode Activation Line
I
Encoder Only Select Line
I/O
Serial Interface Line
O Transmission Confirmation Line
O Transceiver Power Control Line
O Transceiver Mode Control Line
I/O
Transceiver Data Line
O
Mode Indicator Output
I
Baud Rate Selection Line
I
Set Latched Outputs
—
Ground
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.
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PIN DESCRIPTIONS
D0 - D7
The transcoder has eight status lines, D0 through D7. These lines can be set as
either inputs to record the state of switches or as outputs which will reproduce
switch states upon reception of a valid transmission.
CRT/LRN
When this line goes high, the transcoder will enter Learn Mode. If it is held high
for ten seconds, the transcoder will clear its memory. If it goes high while the
ENC_SEL line is high, the transcoder will enter Create Mode. If it goes high while
the SER_IO line is high, the transcoder will enter Serial Mode.
ENC_SEL
If this line is tied high, it will operate as an encoder only. If it is tied low, the
transcoder will default to a decoder until it is set as a transcoder in Create Mode.
SER_IO
This line is used for the Serial Interface Engine, which allows the transcoder to
be programmed by an external device. The transcoder will also use this line to
output the ID of the originating transcoder, status line states, and custom data.
Confirm
This line will go high when the transcoder receives a confirmation that its
transmission was received correctly.
TR_PDN
This line can be used to automatically control power to an external transceiver.
When waiting for data the transcoder will toggle power to a transceiver at a 10%
on to 90% off ratio. The times are determined by the selected baud rate.
TR_SEL
This line will toggle an external transceiver between transmit mode (high) and
receive mode (low).
TR_DATA
This line will send data to and receive data from an external transceiver.
MODE_IND
This line will switch when a valid transmission is received, when Learn Mode or
Create Mode is entered, and when the memory is cleared. This allows for the
connection of a LED to indicate to the user that these events have taken place.
SEL_BAUD
This line is used to select the baud rate of the serial data stream. If the line is
high, the baud rate will be 28,800bps, if it is low, the baud rate will be 9,600bps.
The baud rate must be set before power up. The transcoder will not recognize
any change in the baud rate setting after it is on.
LATCH
If this line is low, then the data outputs will be momentary (active for as long as
a valid signal is received). If this line is high, the outputs will be latched (when a
signal is received to make a particular data line high, it will remain high until
another transmission is received instructing it to go low) by default, but individual
status lines can be set as latched or momentary through the SIE.
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