MDEV-LICAL-MT Linx Technologies Inc, MDEV-LICAL-MT Datasheet - Page 3

• Manufacturer Part Number: MDEV-LICAL-MT
• Description: KIT MASTER DEV MT SERIES
• Manufacturer: Linx Technologies Inc
• Series: MTr
• Type: Transcoderr

Specifications of MDEV-LICAL-MT

• Supply Voltage (min): 7 V
• Product: RF Development Tools
• Supply Voltage (max): 16 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MT Series Transcoder
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

THE POWER SUPPLY
THE PROTOTYPING AREA
THE USB AREA
Page 4
Figure 2: The USB Area
The power supply consists of a standard 9V battery and a power jack connected
to a 3.0V voltage regulator. The regulator can provide approximately 500mA of
current to the prototyping area. If the added circuitry will need more than this,
then the designer must add an external supply. If the circuit will consistently draw
more than 100mA of current, it might be better to use the power jack, as the
battery may run down fairly quickly, reducing testing and development time.
The jack accepts a standard 5.5mm plug with the tip ground and the outer shell
7 to 16VDC positive supply. A reverse voltage protection diode has been
included on the board to protect the circuitry in case the voltage on the plug is
reversed, but it is still a good idea to double-check the polarity.
The prototyping area contains an area of plated through holes so that external
circuitry can be placed on the board. This circuitry can be interfaced with the
transcoder through the breakout header to the right. At the bottom is a row
connected to the 3V power supply and at the top is a row connected to ground.
All of the status lines are connected to a wire-wrap header to the right, allowing
easy access from the prototyping area. The TR_DATA, TR_SEL, TR_PDN and
CONFIRM lines are also available on the header. This allows complete control
of the entire system from the prototyping area.
The development boards have a Linx SDM-USB-QS-S module for use with a PC.
This module is powered by the USB bus so no current is drawn from the battery.
The figure below shows this section.
The jumpers to the right connect the USB module to the transcoder when the
USB interface is in use and should be disconnected when not in use. U4 is a
switch that connects the SER_IO line on the transcoder to either the RXD or TXD
lines on the USB module based on the state of the RTS line. U5 is a level
translator that converts the 5V signals from the USB module to 3V for the
transcoder and vice versa. The RX_IND LED to the left of the module will flash
when data is being received from the PC, and the TX_IND line will flash when
the module is sending data to the PC.
THE TRANSCODER AREA
Figure 3: The Transcoder Area
The figure below shows the transcoder area of the development board.
The transcoder is placed in the center of the chain logo. To the right are two
function switches. SEL_BAUD sets the baud rate of the transcoder. If the switch
is up, the baud rate will be 28,800bps; if down, the baud rate will be 9,600bps.
*Important* Both transcoders must be set to the same baud rate. The on-board
transceiver is only capable of operation at 9,600bps.
If the LATCH switch is up, then the status lines are latched. If the switch is down,
then the status lines are momentary.
To the right of the function switches is a column of status line LEDs and a column
of status line buttons. Each status line has one LED and one button, so button
S0 and LED D0 correspond to status line D0, S1 and D1 to line D1 and so forth.
Pressing a button takes the status line high when the line is set as an input. The
LED will activate when the line goes high when it is set as an output.
There is no isolation between the LEDs and the buttons, so the LED will activate
when the button is pressed. Resistors are included for short circuit protection if
the button is pressed for a line that is an output which is being pulled low.
Beneath the transcoder are two LEDs. D8 is connected to the MODE_IND line
and will light up as described in the MT Transcoder Data Guide. D9 is connected
to the CONFIRM line and will light up when the transcoder receives a valid
confirmation from a remote unit.
Page 5