Datasheet

MT-X1S Manual
PDI Header PDI header for the XMEGA which can be used for programming or debugging.
Note that an onboard programmer is already provided. When using this header,
J19 MUST be disconnected. This is due to the fact that RX and PDI_DATA are
shared. This means that the XMEGA serial TX won't be connected to the USB
AVR RX. This doesn't affect programming, but may present a problem in certain
situations when debugging. If serial TX is required when debugging, the JTAG
header can be used. Alternatively, an external USB-serial bridge can be
connected.
ISP Header ISP header for the USB AVR which can be used for programming or debugging.
The USB AVR can be programmed over USB using the DFU bootloader.
Port A All pins are routed to headers. The 1.25V precision reference can be connected
to pin A0 (Vref input) through a solder jumper. The temperature sensor output
and audio amplifier input are also connected to this port.
Port B All pins are routed to headers. The 1.25V precision reference can be connected
to pin B0 (Vref input) through a solder jumper. Note that JTAG is connected to
pins B4 – B7. JTAG must be disabled to use these pins for other purposes like
the ADC.
Port C All pins are routed to headers. No peripheral devices are connected to this port.
Port D All pins are routed to headers. This port also connects to the LEDs and 32KB
SPI SRAM memory through solder jumpers.
Port E All pins are routed to headers. This port also connects to the buttons and the
MicroSD card slot through solder jumpers.
Port F All pins are routed to headers. This port also connects to the USART of the USB
AVR (RX, TX, and optionally, XCK) as well as the SPI inputs of the relay driver
(MOSI and SCK) through solder jumpers. To minimize power consumption. TX
should be tristated before entering sleep.
Ports H, J, and K All pins are routed to headers. No peripheral devices are connected to these
ports. They can be used for GPIO or for use with external memory.
Pins Q0 and Q1 The 32.768KHz crystal is connected to these pins, which serve as the TOSC
input pins of the RTC.
Pins Q2 and Q3 Pin Q2 is routed to the chip select pin of the relay driver. Pin Q3 is routed to the
audio amplifier power-down pin. Neither pin is routed to a header.
Pins R0 and R1 Both of these pins are routed to an HC49 crystal footprint. A 22pF capacitor is
also connected to each line. If an external clock is used, connect it to R1.
Serial Screw Terminal Pin 1, which is closest to the port F header, is ground. This should always be
connected, with both RS-232 and RS-485. Pin 2 is RX (RS-232) or inverting (-,
RS-485). Pin 3 is TX (RS-232) or non-inverting (+, RS-485).
January 29, 2015 9 http://www.mattairtech.com/