Current Measurement Header; Peripherals; Qtouch Button; Crystals - Atmel SAM4L Xplained Pro User Manual

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 SAM4L Xplained Pro. All power to the ATSAM4LC4C 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
ATSAM4LC4C 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 SAM4L Xplained Pro kit has one QTouch button and the connection to the SAM4L 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 SAM4L
PC13
PC14
4.2.2.

Crystals

The SAM4L Xplained Pro kit contains two crystals that can be used as clock sources for the SAM4L
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 appnote AVR4100.
Table 4-7 External 32.768kHz Crystal
Pin on SAM4L
XIN32
XOUT32
Table 4-8 External 12MHz Crystal
Pin on SAM4L
PA00
PA01
4.2.3.

Mechanical Buttons

The SAM4L Xplained Pro contains two mechanical buttons. One button is the RESET button connected
to the SAM4L 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.
Function
CATB_SENSE15
CATB_DIS
Function
XIN32
XOUT32
Function
XIN0
XOUT0
Atmel SAM4L Xplained Pro [USER GUIDE]
Atmel-42074C-SAM4L-Xplained-Pro_User Guide-11/2015
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