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 SAM4L8 Xplained Pro. All power to the ATSAM4LC8CA 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
ATSAM4LC8CA to be powered through its I/O pins. This may cause permanent damage to the
device.
4.2.
Peripherals
4.2.1.
QTouch Button
The SAM4L8 Xplained Pro kit has one QTouch button and the connection to the SAM4L8 is shown in the
table below. The QTouch sensor, a copper fill, is located on the second layer (GND) of the board. The
sensor is shielded by the third and the bottome layer (VCC and signal layer respectively) and therefore
the sensor is not affected by any touches from the back side of the board.
Table 4-6. QTouch Button Connections
Pin on SAM4L8
Function
PC13
CATB_SENSE15
PC14
CATB_DIS
4.2.2.
Crystals
The SAM4L8 Xplained Pro kit contains two crystals that can be used as clock sources for the SAM4L8
device. Each crystal has a cut-strap next to it that can be used to measure the oscillator safety factor.
This is done 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 4-7. External 32.768kHz Crystal
Pin on SAM4L8
Function
XIN32
XIN32
XOUT32
XOUT32
Table 4-8. External 12MHz Crystal
Pin on SAM4L8
Function
PA00
XIN0
PA01
XOUT0
4.2.3.
Mechanical Buttons
The SAM4L8 Xplained Pro contains two mechanical buttons. One button is the RESET button connected
to the SAM4L8 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.
Atmel SAM4L8 Xplained Pro [USER GUIDE]
Atmel-42103B-SAM4L8-Xplained-Pro_User Guide-04/2016
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