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Atmel AVR1925: XMEGA-C3 Xplained Hardware User’s Guide [APPLICATION NOTE]

42053A−AVR−02/2013

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

Table 3-3. 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 PB4 -

6 ADC5 PB5 -

7 ADC6 PB6 -

8 ADC7 PB7 -

9 GND - -

10 VCC_P3V3 - -

The header J3 is connected to digital ports of XMEGA. Table 3-4 shows the mapping of the XMEGA I/O to J3.

Table 3-4. 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 PA4 PA4

6 PA5 PA5

7 PA6 PA6

8 PA7 PA7

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 3-5. 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 data and command select

(1)

6 MOSI PD3 Display and microSD card MOSI

7 MISO PD2 microSD card MISO

8 SCK PD1 Display and microSD card clock input

9 GND - -

10 VCC_P3V3 - -

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