4.
Hardware User Guide
4.1.
Power Distribution
SAM L22 Xplained Pro has three power sources; EDBG USB, Target USB, and/or external 5.0V. The kit
will automatically select a source to draw power from. The kit has two on-board 3.3V voltage regulators,
one for the EDBG and XAM and one for the ATSAML22N18A and other peripherals.
An on board super capacitor (47mF) is charged to 3.3V from the target 3.3V net. The super capacitor is
connected to PB03 (VBAT) through a selection header and is intended for backup use in sleep modes.
Figure 4-1. Power Supply Block Diagram
VCC_P5V0
EDBG & XAM
SAML22N18
Regulator 3.3V
Power source
Power switch
Power converter
Power consumer
VCC_P3V3
Peripherals
Power
Measurement
Select
Auto mux disable
External 5V
input
EDBG USB
Target USB
Auto mux with
current limit
Regulator 3.3V
Jumper
VCC_MCU
VCC_TARGET
Supercap
Select
VBAT
Related Links
on page 11
4.2.
Connectors
The following sections describes the implementation of the relevant connectors and headers on SAM L22
Xplained Pro and their connection to the ATSAML22N18A. The tables of connections in the sections also
describes which signals are shared between the headers and on-board functionality. The figure below
shows all available connectors and jumpers on SAM L22 Xplained Pro.
Atmel SAM L22 Xplained Pro [USER GUIDE]
Atmel-42474B-SAM-L22-Xplained-Pro_User Guide-12/2015
15
