4.1.3.

Current Measurement Header

An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of

the SAM G55 Xplained Pro. All power to the ATSAMG55J19 is routed through this header. To measure

the power consumption of the device remove the jumper and replace it with an ammeter.

Caution:  Removing the jumper from the pin-header while the kit is powered may cause the

ATSAMG55J19 to be powered through its I/O pins. This may cause permanent damage to the

device.

4.2.

Peripherals

4.2.1.

Crystals

The SAM G55 Xplained Pro kit contains a 32kHz crystal mounted on it along with a footprint for a second

crystal. The crystal circuit has a cut-strap next to it which can measure the oscillator safety factor. This is

performed by cutting the strap and adding a resistor across the strap. More information about oscillator

allowance and safety factor can be found in application note AVR4100.

Table 4-5. External 32.768kHz Crystal

Pin on SAM G55

Function

PA07

XIN32

PA08

XOUT32

The additional crystal's pins are shared with the TWI lines in EXT3. Remove the 0Ω resistors R307 and

R306 before mounting this crystal.

Table 4-6. Footprint for Additional Crystal

Pin on SAM G55

Function

PB09

XIN

PB08

XOUT

4.2.2.

Mechanical Buttons

The SAM G55 Xplained Pro contains two mechanical buttons. One button is the RESET button

connected to the SAM G55 reset line and the other is a generic user configurable button. When a button

is pressed it will drive the I/O line to GND.

Table 4-7. Mechanical Buttons

Pin on SAM G55

Silkscreen Text

NRST

RESET

PA02

SW0

4.2.3.

LED

An yellow LED is available on the SAM G55 Xplained Pro board. The LED can be activated by driving the

connected I/O line to GND.

Atmel SAM G55 Xplained Pro [USER GUIDE]

Atmel-42389B-SAM-G55-Xplained-Pro_User Guide-04/2016

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