LICAL-TRC-MT【PDF 11/44 页】IC TRANSCODER MT BI-DIR 20-SSOP

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The MT Series transcoder can store up to sixty unique addresses in its

memory. If a transcoder is re-learned, its permissions are overwritten. The

transcoder does not create a second instance of the same address. If a

new transcoder is learned while the memory is full, then the transcoder

writes the new address over the first address in memory. It flashes the

MODE_IND line five times to indicate that the memory is full and the next

address learned will overwrite the first. All of the learned addresses are

retained if power is removed from the transcoder.

If the CRT/LRN line is held high for ten seconds while the ENC_SEL line is

low, then the transcoder erases all of the stored addresses from memory.

The MODE_IND line goes high for as long as the CRT/LRN line is high,

but after the ten seconds it goes low. Once the CRT/LRN line is pulled low

again, the MODE_IND line goes high for two seconds to indicate that the

memory has been cleared.

Transmit Mode

When any of the status lines that are set as inputs go high, the transcoder

enters Transmit Mode. It pulls the TR_PDN line high to activate the

transceiver, pulls the TR_SEL line high to place the transceiver into transmit

mode, records the states of the status lines, assembles the packet,

and sends it through the TR_DATA line. The transcoder then pulls the

TR_SEL line low to place the transceiver into receive mode and looks for a

confirmation from the remote transcoder. If a valid confirmation is received,

then the transcoder pulls the CONFIRM line high, otherwise it checks to

see if any status line inputs are high.

The transcoder continues this for as long as any of the status line inputs

are high, updating the states of the status lines with each transmission.

Once all of the input lines are pulled low, the transcoder finishes the

current transmission, pulls CONFIRM and TR_PDN low to deactivate the

transceiver, and goes to sleep.

The MT has the ability to control the status line byte through the SIE. An

external microcontroller or PC can be used to write the desired input states

and a packet counter into the transcoder. The transcoder uses this byte

instead of looking at the status line inputs, sends the specified number of

packets, then goes to sleep. This is subject to the I/O settings, so lines set

as outputs cannot be set high.

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