LICAL-TRC-MT Linx Technologies Inc, LICAL-TRC-MT Datasheet - Page 10

• Manufacturer Part Number: LICAL-TRC-MT
• Description: IC TRANSCODER MT BI-DIR 20-SSOP
• Manufacturer: Linx Technologies Inc
• Series: MTr
• Type: Transcoderr

Specifications of LICAL-TRC-MT

• Package / Case: 20-SSOP
• Applications: RF, IR
• Mounting Type: Surface Mount
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: LICAL-TRC-MTTR

TRANSCODER MODE_IND DEFINITIONS
Table 6: MT Series Transcoder MODE_IND Definitions
LEGAL CONSIDERATIONS
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Receive Mode
Create Address
Mode
Learn Mode
Erase Mode
Serial Interface
Mode
*Blink = ON for 1sec and OFF 250ms
*Flash = ON for 65ms and OFF for 65ms
The MODE_IND line is the primary means of indicating the state of the
transcoder to the user. The table below gives the definitions of the MODE_IND
signals.
If the transcoder is to be used with a transceiver operating in the 260MHz to
470MHz ISM band in the United States under Part 15.231, then there are some
legal requirements that need to be considered. The FCC requires that the
transmission control something, so the transcoder cannot be used simply for
passing data. The data lines and CONFIRM line must be connected to
something that turns on or off, such as a motor, LED, buzzer, or display.
Application Note AN-00128 goes into this in detail.
The transcoder has the ability to be automatically activated with the Write Status
Inputs command through the SIE. The FCC requires that any automatic
transmission cease within 5 seconds of activation. The MT could exceed this
time depending on the baud rate used, the options that are enabled, and the
number of packets that are sent. Table 3 shows the packet time at each baud
rate with the various options enabled or disabled. The designer needs to be
aware of the time depending on the options that are in use and adjust the packet
counter in the command to ensure that the total time does not exceed 5 seconds.
Application Note AN-00157 goes into the serial commands in more detail and
Application Note AN-00125 goes into the FCC regulations under Part 15.231.
ON for as long as the transcoder is receiving data from a
learned user. This only indicates authorized data reception,
not status output activation.
ON during address generation, while CRT/LRN line is HIGH,
then it flashes* when CRT/LRN line is taken LOW. Once the
15-second timer expires or the CRT/LRN line is asserted
again, the MODE_IND line will turn OFF.
ON while CRT/LRN line is held HIGH until taken LOW to enter
Learn Mode, then it flashes* for 15 seconds until the timer
expires or the CRT/LRN line is asserted again. If the 60th user
profile has been saved, it will blink* 5 times to indicate the next
user profile will overwrite the first.
ON while CRT/LRN line is held HIGH for 10 seconds and
Erase Mode is entered, then it turns OFF until the CRT/LRN
line is released. It will then turn back ON again for 2 seconds
to indicate erase completion.
OFF while command is being received (SER_IO = input) and
ON while ACK/reply message is being sent (SER_IO =
output).
Figure 8: MT Series Transcoder Power-up Flowchart
Set the baud rate
All status lines
to 28,800bps
are outputs
Yes
No
No
Initialize and pull
Pull the TR_PDN
Set as encoder
Set status lines
all outputs low
ENC_SEL line
Encoder only?
Are any status
CRT/LRN line
address been
according to
assignments
SEL_BAUD
ENC_SEL
lines high?
Power Up
line high?
line high?
created?
line low
Has an
Select
Sleep
Is the
high?
Is the
Is the
Mode
Is the
high?
Yes
No
Yes
No
No
Yes
Yes
Yes
Yes
No
No
Transmit
Set the baud rate
Config.
Go to
Mode
Go to
Mode
All status lines
to 9,600bps
are inputs
No
Set the OFF timer
Pull the TR_PDN
Pull the TR_PDN
Set the ON timer
Are any status
TR_DATA line
CRT/LRN line
Stop the OFF
time to 10%
lines high?
Line High
ON timer
timeout?
Line Low
to 90%
Is the
high?
Is the
high?
Sleep
Timer
Yes
No
No
No
Yes
Yes
Yes
Receive
Config.
Go to
Mode
Go to
Mode
No
Pull the CONFIRM
Pull the CONFIRM
Send the packet
Confirm Bounce
Set to Transmit
Set to Transmit
Set to Receive
timer timeout?
Are any status
timer timeout?
Assemble the
Confirm Wait
confirmation
lines high?
Transmit
Any valid
line high
Did the
Did the
line low
packet
Mode
Mode
Mode
data?
Mode
Yes
Yes
Yes
No
Yes
No
No
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Select
Go to
Mode