ATXMEGAA3BU-XPLD Datasheet ATXMEGAA3BU-XPLD | P7-P9

Atmel AVR1923

8394B-AVR-02/12

This however will disable the JTAG interface until the connection is reestablished by,

for example soldering a bridge on the cut-strap.

4.2 I/O expansion headers

The Atmel AVR XMEGA-A3BU Xplained headers J1, J2, J3, and J4 offer access to

the I/O of the microcontroller in order to expand the board, for example by mounting a

top module onto the board.

The header J1 offers digital communication interfaces like UART, TWI and SPI. Table

4-2 sho

ws how the Atmel AVR XMEGA is connected to the header.

NOTE When using TWI please note that no pull-ups are mounted on the board from the

factory, so it is required to either enable the internal pull-ups of the device or to mount

the external pull-ups on the available footprints (R200 and R201). Please refer to the

assembly drawing in the design documentation for the location of these footprints.

Table 4-2. Expansion header J1.

Pin on J1 Name on J1 XMEGA pin Shared with onboard functionality

1 SDA PC0 -

2 SCL PC1 -

3 RXD PC2 -

4 TXD PC3 -

5 SS PC4 -

6 MOSI PC5 -

7 MISO PC6 -

8 SCK PC7 -

9 GND - -

10 VCC_P3V3 - -

The header J2 is connected to analog ports of the XMEGA as shown in Table 4-3.

Table 4-3. Expansion header J2.

Pin on J2 Name on J2 XMEGA pin Shared with onboard functionality

1 ADC0 PB0 -

2 ADC1 PB1 -

3 ADC2 PB2 -

4 ADC3 PB3 -

5 ADC4 PA4 -

6 ADC5 PA5 -

7 ADC6 PA6 -

8 ADC7 PA7 -

9 GND - -

10 VCC_P3V3 - -

The I/O connected to the expansion header J3 is shared with on-board features as

sensors and JTAG interface. Therefore care must be taken when J3 is used for

expansions. Table 4-4 sho

ws the mapping of the XMEGA I/O to J3.

Atmel AVR1923

8394B-AVR-02/12

Table 4-4. Expansion header J3.

Pin on J3 Name on J3 XMEGA pin Shared with onboard functionality

1 PA0 PA0 Light sensor

(1)

2 PA1 PA1 Temperature sensor

(1)

3 PA2 PA2 Filter output

(1)

4 PA3 PA3 Display reset

5 PB4 PB4 JTAG TMS

6 PB5 PB5 JTAG TDI

7 PB6 PB6 JTAG TCK

8 PB7 PB7 JTAG TDO

9 GND - -

10 VCC_P5V0 - -

Note: 1. Can be disconnected from onboard functionality by cut-straps.

The header J4 offers digital communication interfaces such as UART and TWI but

care must be taken because some pins are also connected to on-board peripherals.

Table 4-5. Expansion header J4.

Pin on J4 Name on J4 XMEGA pin Shared with onboard functionality

1 SDA PE0 -

2 SCL PE1 -

3 RXD PE2 -

4 TXD PE3 -

5 SS PD0 Display register select

(1)

6 MOSI PD3 Serial flash MOSI

7 MISO PD2 Display and serial flash MISO input

8 SCK PD1 Display and serial flash clock input

9 GND - -

10 VCC_P3V3 - -

Note: 1. Can be disconnected from onboard functionality by cut-strap (J204).

Atmel AVR1923

8394B-AVR-02/12

5 Peripherals

5.1 Serial flash

The Atmel AVR XMEGA-A3BU Xplained has an external Atmel AVR AT45DB642D

DataFlash device mounted. A footprint is also available for adding an industrial

standard serial flash like the AT25 series from Atmel. Compatible serial flash devices

for both footprints are listed in Table 5-2 and th

e connection to the MCU is shown in

Table 5-1.

The footp

rints share the same SPI lines including the chip select, and therefore it is

not possible to mount devices on both footprints at the same time.

Table 5-1. Serial flash connection.

Pin on XMEGA Serial flash

PD1 SCK

PD3 MOSI

PD2 MISO

PF4 SS

Table 5-2. Compatible devices for the footprints.

Atmel AVR AT45DB Atmel AVR AT25DF

AT45DB64D2-CNU (mounted) AT25DF641A-SH

AT45DB321D-MWU AT25DF321A-SH

AT45DB161D-SS AT25DF161-SH

AT45DB081D-SS AT25DF081-SSH

AT45DB041D-SS AT25DF021-SSH

AT45DB021D-SS

AT45DB011D-SS

5.2 Atmel AVR QTouch button

The XMEGA-A3BU Xplained kit has one Atmel QTouch button and the connection to

the Atmel AVR XMEGA is shown in Table 5-3. T

he QTouch sensor, a copper fill, is

located on the second layer of the board (same as GND layer). The sensor is

shielded by the third layer (VCC layer) and therefore the sensor is not affected by any

touches from the back side of the board.

Table 5-3. QTouch button connection.

Pin on XMEGA QButton

PF6 SNS

PF7 SNSK

5.3 Battery backup system

The battery backup system backs up the RTC of the XMEGA. It consists of a coin cell

battery, a battery holder and a jumper that can be used to disconnect the battery from

the XMEGA. A manganese dioxide lithium battery (CR1220) from Panasonic with a

nominal voltage of 3V and nominal capacity of 35mAh is used in this design. In order

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ATXMEGAA3BU-XPLD

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