LICAL-TRC-MT【PDF 10/44 页】IC TRANSCODER MT BI-DIR 20-SSOP

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Create Mode

Create Mode allows the generation of a unique address to ensure the

uniqueness of a transmission and prevent unintentional operation of

devices. The MT Series transcoder allows for the creation of 16,777,216

(224) possible addresses. The assignment of the status lines as inputs or

outputs also occurs in this mode.

Create Mode is entered by pulling the CRT/LRN line high while the

ENC_SEL line is high. The address is randomized for as long as the CRT/

LRN line is high (the ENC_SEL line is not checked again once the process

is begun). Once the line is pulled low, the resulting address is saved in

memory and the transcoder is ready to accept the status line assignments.

Each line that is to be an input should be pulled high. Any lines not taken

high are set as outputs. There is no requirement for the order in which the

lines are activated or the time between activations as long as all of the

desired lines are activated within the time out period. The transcoder saves

the assignments and goes to sleep when the CRT/LRN line is taken high

again or when it times out after 15 seconds.

Learn Mode

In order for the transcoder to accept transmissions from a specific

transcoder, it must first learn that transcoder’s address. This is done by

taking the CRT/LRN line high then low while the ENC_SEL line is low to

place the transcoder into Learn Mode. Once in Learn Mode, the MODE_

IND line starts switching, allowing for connection of a LED to provide visual

indication that the transcoder is ready to accept a new address. This

continues until the CRT/LRN line goes high again or until a time-out after

15 seconds.

The transcoder looks for a valid transmission from another transcoder and

records the received address. It also records the status line that was

activated in the Control Permissions. Each status line on the transmitting

side that will be authorized to control the receiving transcoder needs to be

activated. The receiving transcoder updates the Control Permissions with

each valid packet that contains a new active status line. It is not necessary

to hold all of the desired status lines on the transmitting side high at the

same time, simply press each one that is to be authorized within the time

out period. When the CRT/LRN line is taken high again or the transcoder

times-out after 15 seconds, the recorded address and Control Permissions

are saved in memory and the transcoder returns to sleep.

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