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SMART ARM-based Microcontrollers
SAM L22 Xplained Pro
USER GUIDE
Preface
The Atmel® SAM L22 Xplained Pro evaluation kit is a hardware platform to
evaluate the ATSAML22N18A microcontroller.
Supported by the Atmel Studio integrated development platform, the kit
provides easy access to the features of the Atmel ATSAML22N18A and
explains how to integrate the device in a custom design.
The Xplained Pro MCU series evaluation kits include an on-board
Embedded Debugger, and no external tools are necessary to program or
debug the ATSAML22N18A.
The Xplained Pro extension kits offers additional peripherals to extend the
features of the board and ease the development of custom designs.
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Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................4
1.1. Features....................................................................................................................................... 4
1.2. Kit Overview................................................................................................................................. 4
2. Getting Started...........................................................................................................6
2.1. Xplained Pro Quick Start.............................................................................................................. 6
2.2. Design Documentation and Relevant Links................................................................................. 6
3. Xplained Pro.............................................................................................................. 8
3.1. Embedded Debugger................................................................................................................... 8
3.2. Xplained Pro Analog Module (XAM).............................................................................................9
3.2.1. Overview........................................................................................................................9
3.2.2. EDBG Interface..............................................................................................................9
3.2.3. Sample Rate................................................................................................................ 10
3.2.4. Measurement Ranges and Accuracy...........................................................................10
3.3. Hardware Identification System..................................................................................................10
3.4. Power Sources........................................................................................................................... 11
3.5. Xplained Pro Headers and Connectors......................................................................................12
3.5.1. Xplained Pro Standard Extension Header................................................................... 12
3.5.2. Xplained Pro Segment LCD Connector....................................................................... 13
3.5.3. Xplained Pro Power Header........................................................................................ 14
4. Hardware User Guide..............................................................................................15
4.1. Power Distribution...................................................................................................................... 15
4.2. Connectors................................................................................................................................. 15
4.2.1. Xplained Pro Standard Extension Headers................................................................. 16
4.2.2. Segment LCD Connector.............................................................................................19
4.2.3. Arduino Connector Footprint........................................................................................21
4.2.4. USB............................................................................................................................. 23
4.2.5. Cortex Debug Connector............................................................................................. 23
4.2.6. Current Measurement Header..................................................................................... 24
4.3. Peripherals................................................................................................................................. 24
4.3.1. Crystal..........................................................................................................................24
4.3.2. Mechanical Buttons..................................................................................................... 24
4.3.3. LED..............................................................................................................................25
4.3.4. QTouch Button.............................................................................................................25
4.3.5. Backup Super Capacitor..............................................................................................25
4.3.6. Crypto Device.............................................................................................................. 26
4.3.7. Tamper Detection.........................................................................................................26
4.4. Embedded Debugger Implementation........................................................................................27
4.4.1. Serial Wire Debug........................................................................................................27
4.4.2. Virtual COM Port..........................................................................................................27
4.4.3. Atmel Data Gateway Interface.....................................................................................27
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4.4.4. XAM Configuration.......................................................................................................28
4.5. Kit Modifications......................................................................................................................... 29
4.5.1. Operation at Other Voltages........................................................................................ 33
5. Appendix..................................................................................................................35
5.1. Getting Started with IAR.............................................................................................................35
5.2. Connecting a SAM-ICE to an Xplained Pro Board..................................................................... 38
6. Hardware Revision History and Known Issues........................................................40
6.1. Identifying Product ID and Revision........................................................................................... 40
6.2. Revision 4...................................................................................................................................40
6.3. Revision 2...................................................................................................................................40
6.3.1. Pin-out Changes.......................................................................................................... 41
6.3.2. CryptoAuthentication Device....................................................................................... 41
6.3.3. Assembly Drawings..................................................................................................... 41
7. Document Revision History..................................................................................... 44
8. Evaluation Board/kit Important Notice..................................................................... 45
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1. Introduction
1.1. Features
• ATSAML22N18A microcontroller
• One mechanical reset button
• One mechanical programmable button
• Xplained Pro segment LCD connector
– Eight COM signals
– Twenty-seven SEG signals
– Six touch signals
• One QTouch® button
• One yellow user LED
• Backup super capacitor
• 32.768kHz crystal
• USB interface, device only
• Three Xplained Pro extension headers
• Embedded Debugger
– Auto-ID for board identification in Atmel Studio
– One yellow status LED
– One green board power LED
– Symbolic debug of complex data types including scope information
– Programming and debugging, including power measurements
– Data Gateway Interface: SPI, I2C, four GPIOs
– Virtual COM port (CDC)
• Embedded current measurement circuitry, with Atmel Data Visualizer support for data visualization
• USB powered
• Supported with application examples in Atmel Software Framework
1.2. Kit Overview
The Atmel SAM L22 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel
ATSAML22N18A.
The kit offers a set of features that enables the ATSAML22N18A user to get started with the SAM L
peripherals right away and to get an understanding of how to integrate the device in their own design.
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Figure 1-1. SAM L22 Xplained Pro Evaluation Kit Overview
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2. Getting Started
2.1. Xplained Pro Quick Start
Three steps to start exploring the Atmel Xplained Pro platform:
1. Download Atmel Studio.
2. Launch Atmel Studio.
3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the DEBUG USB
port on the kit.
When the Xplained Pro MCU kit is connected to your computer for the first time, the operating system will
perform a driver software installation. The driver file supports both 32- and 64-bit versions of Microsoft
Windows® XP, Windows Vista®, Windows 7, and Windows 8.
Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will auto
detect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will present
relevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also has
the option to launch Atmel Software Framework (ASF) example applications for the kit. The SAM L22
device is programmed and debugged by the on-board Embedded Debugger and therefore no external
programmer or debugger tool is needed.
2.2. Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for the SAM L22 Xplained
Pro.
• Xplained Pro products - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluation
kits for Atmel microcontrollers and other Atmel products. It consists of a series of low-cost MCU
boards for evaluation and demonstration of features and capabilities of different MCU families.
• Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
• Atmel sample store - Atmel sample store where you can order samples of devices.
• EDBG User Guide - User guide containing more information about the on-board Embedded
Debugger.
• IAR Embedded Workbench® for ARM® - This is a commercial C/C++ compiler that is available for
ARM®. There is a 30 day evaluation version as well as a code size limited kick-start version
available from their website. The code size limit is 16KB for devices with M0, M0+, and M1 cores
and 32KB for devices with other cores.
• Atmel QTouch® Library PTC - QTouch Library for Atmel AVR® and ARM®-based microcontrollers.
• Atmel QTouch® Composer - Tool for developing capacitive buttons, sliders, and wheels
applications.
• Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizing
data. Data Visualizer can receive data from various sources such as the Embedded Debugger Data
Gateway Interface found on Xplained Pro boards and COM ports.
• Segment LCD1 Xplained Pro - Segment LCD1 Xplained Pro is a segment LCD Xplained Pro
extension with 96 segments that uses four COM and 24 SEG signals. An Xplained Pro MCU board
with a Xplained Pro segment LCD connector is required to use the kit.
• Touch Segment LCD1 Xplained Pro - Touch Segment LCD1 Xplained Pro is a segment LCD
Xplained Pro extension with 179 segments that uses eight COM and 24 SEG signals. The LCD has
®
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five built-in mutual capacitance sensors for use with a PTC module. An Xplained Pro MCU board
with a Xplained Pro segment LCD connector is required to use the kit.
• Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,
3D plots, layer plots etc.
• Hardware Users Guide in PDF format - PDF version of this User Guide.
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3. Xplained Pro
Xplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. The
platform consists of a series of Microcontroller (MCU) boards and extension boards, which are integrated
with Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support data
streaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards,
which are connected through a set of standardized headers and connectors. Each extension board has
an identification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.
This information is used to present relevant user guides, application notes, datasheets, and example
code through Atmel Studio.
3.1. Embedded Debugger
The SAM L22 Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board debugging.
The EDBG is a composite USB device of three interfaces; a debugger, Virtual COM Port, and a Data
Gateway Interface (DGI).
Together with Atmel Studio, the EDBG debugger interface can program and debug the ATSAML22N18A.
On SAM L22 Xplained Pro, the SWD interface is connected between the EDBG and the
ATSAML22N18A.
The Virtual COM Port is connected to a UART on the ATSAML22N18A and provides an easy way to
communicate with the target application through terminal software. It offers variable baud rate, parity, and
stop bit settings. Note that the settings on the ATSAML22N18A must match the settings given in the
terminal software.
Info: If not set automatically, data terminal ready (DTR) must be set in the terminal software.
The DGI consists of several physical interfaces for communication with the host computer.
Communication over the interfaces is bidirectional. It can be used to send events and values from the
ATSAML22N18A or as a generic printf-style data channel. Traffic over the interfaces can be timestamped
on the EDBG for more accurate tracing of events. Note that timestamping imposes an overhead that
reduces maximal throughput. Atmel Data Visualizer is used to send and receive data through DGI.
The EDBG controls two LEDs on SAM L22 Xplained Pro; a power LED and a status LED. The table
below shows how the LEDs are controlled in different operation modes.
Table 3-1. EDBG LED Control
Operation mode Power LED Status LED
Normal operation Power LED is lit when power is
applied to the board.
Bootloader mode (idle) The power LED and the status LED blinks simultaneously.
Bootloader mode (firmware
upgrade)
The power LED and the status LED blinks in an alternating pattern.
Activity indicator, LED flashes
when any communication
happens to the EDBG.
For further documentation on the EDBG, see the EDBG User Guide.
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3.2. Xplained Pro Analog Module (XAM)
3.2.1. Overview
The Xplained Pro Analog Module (XAM) extends the embedded debugger with high dynamic range
current measurement. This enables power profiling of the target system.
Current output
Range selection
Current input
Calibration ON/OFF
100 mOhm
100 Ohm
Xplained Pro Analog Module (XAM)
The XAM consists of:
• Calibration circuitry
• Voltage reference
• Analog frontend
– Shunt resistors with a range selection switch
– Pre-amplifier
– Two active filters with gain
• Control MCU
– Analog to digital converter
– Signal processing
– Control/communication interface to the EDBG
Calibration
circuitry
Pre-amplifier
20x
20x
voltage
reference
2.7V
2x
16x
Active filter with
gain
GPIO(s)
GPIO
AREF
ADC0
ADC1
GND
GPIO
Control MCU
S&H
ADC
Sync GPIO
I2C
SPI
Clock sync
SWD
EDBG
The current measurement frontend is a high side shunt measurement with a pre-amplifier and a second
active filter stage with gain. The wide dynamic range is achieved by four measurement ranges which are
defined by two shunts and the two parallel second stage active filters with gain.
3.2.2. EDBG Interface
The Xplained Pro Analog Module (XAM) is connected to the EDBG with the following interfaces:
• I2C: This is used to control and configure the XAM
• SPI: Current measurement data is streamed to the EDBG via this interface. This is a one-way data
transfer channel from the XAM to the EDBG
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• SWD: The MCU in the XAM is programmed via SWD from the EDBG
• GPIO: At least one GPIO that is connected to the EDBG from the target MCU is also connected to
the current measurement unit to enable the user to sync current measurements with his application
• Clock sync: Synchronization signal to synchronize ADC measurements with EDBG
• Reference clock: Reference clock for the XAM
3.2.3. Sample Rate
The raw sampling rate of the Xplained Pro analog module (XAM) is up to 250kHz and with the default
averaging configuration (average of 16 samples) the actual output of the XAM is 16.67kSPS (note that
the XAM output sample rate is not an integer fraction of the raw sampling).
3.2.4. Measurement Ranges and Accuracy
The Xplained Pro analog module has four measurement ranges. These are defined by two shunt resistors
and two gain stages.
Measurement
Hardware Resolution Accuracy Comments
range
Range 1 Low current shunt and
high gain stage
Range 2 Low current shunt and
low gain stage
Range 3 High current shunt and
high gain stage
Range 4 High current shunt and
low gain stage
The ranges are switched automatically by the XAM to achieve best measurement results and the
currently active range is visualized in the Atmel Data Visualizer frontend tool. The maximum voltage drop
over the shunt resistor is 100mV and the XAM will switch the range automatically before this limit is
reached.
3.3. Hardware Identification System
All Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication™ chip
mounted. This chip contains information that identifies the extension with its name and some extra data.
When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and
sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,
code examples, and links to relevant documents. The table below shows the data fields stored in the ID
chip with example content.
20nA 1 LSB ±1% Below 1μA the error will
increase. Typical error for
300nA is 1 LSB ± 10%
150nA 1 LSB ±1%
10μA 1 LSB ±1%
100μA 1 LSB ±1% Above 100mA the error will
increase to 1 LSB ±5% at
400mA. Maximum current is
400mA
Table 3-2. Xplained Pro ID Chip Content
Data field Data type Example content
Manufacturer ASCII string Atmel'\0'
Product Name ASCII string Segment LCD1 Xplained Pro'\0'
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Data field Data type Example content
Product Revision ASCII string 02'\0'
Product Serial Number ASCII string 1774020200000010’\0’
Minimum Voltage [mV] uint16_t 3000
Maximum Voltage [mV] uint16_t 3600
Maximum Current [mA] uint16_t 30
3.4. Power Sources
The SAM L22 Xplained Pro kit can be powered by several power sources as listed in the table below.
Table 3-3. Power Sources for SAM L22 Xplained Pro
Power input Voltage requirements Current requirements Connector marking
External power 5V ±2% (±100mV) for
USB host operation.
4.3V to 5.5V if USB host
operation is not
required.
Recommended
minimum is 1A to be
able to provide enough
current for connected
USB devices and the
PWR
board itself.
Recommended
maximum is 2A due to
the input protection
maximum current
specification.
Embedded debugger
USB
Target USB 4.4V to 5.25V (according
4.4V to 5.25V (according
to USB spec.)
to USB spec.)
500mA (according to
USB spec.)
500mA (according to
USB spec.)
DEBUG USB
TARGET USB
The kit will automatically detect which power sources are available and choose which one to use
according to the following priority:
1. External power.
2. Embedded Debugger USB.
3. Target USB.
Info: External power is required when 500mA from a USB connector is not enough to power
the board with possible extension boards. A connected USB device in a USB host application
might easily exceed this limit.
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3.5. Xplained Pro Headers and Connectors
3.5.1. Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU
boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all
pins are not always connected. All connected pins follow the defined pin-out description in the table
below.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU
boards or to access the pins of the target MCU on Xplained Pro MCU boards directly.
Table 3-4. Xplained Pro Standard Extension Header
Pin number Name Description
1 ID Communication line to the ID chip on an extension board
2 GND Ground
3 ADC(+) Analog to digital converter, alternatively positive part of differential
ADC
4 ADC(-) Analog to digital converter, alternatively negative part of differential
ADC
5 GPIO1 General purpose I/O
6 GPIO2 General purpose I/O
7 PWM(+) Pulse width modulation, alternatively positive part of differential
PWM
8 PWM(-) Pulse width modulation, alternatively negative part of differential
PWM
9 IRQ/GPIO Interrupt request line and/or general purpose I/O
10 SPI_SS_B/
Slave select for SPI and/or general purpose I/O
GPIO
11 I2C_SDA Data line for I2C interface. Always implemented, bus type.
12 I2C_SCL Clock line for I2C interface. Always implemented, bus type.
13 UART_RX Receiver line of target device UART
14 UART_TX Transmitter line of target device UART
15 SPI_SS_A Slave select for SPI. Should preferably be unique.
16 SPI_MOSI Master out slave in line of serial peripheral interface. Always
implemented, bus type.
17 SPI_MISO Master in slave out line of serial peripheral interface. Always
implemented, bus type.
18 SPI_SCK Clock for serial peripheral interface. Always implemented, bus type.
19 GND Ground
20 VCC Power for extension board
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3.5.2. Xplained Pro Segment LCD Connector
Xplained Pro MCU boards that have a microcontroller, which supports segment LCDs, can implement a
51-pin segment LCD extension connector. This connector is implemented with HIROSE DF-9 series.
Xplained Pro MCU boards use the male version DF9-51P-1V(69) and Xplained Pro extension boards use
the female counterpart DF9-51S-1V(69). The connector has a standardized pin-out as shown in the table
below.
Info:
All pins are not connected on all Xplained Pro MCU boards, it depends on how many segments
and common terminals the target MCU supports.
Pin 37, 38, 39, 40, 41, and 42 can alternatively be used for QTouch signals. When they are
used for touch they should not be used for display segments.
Table 3-5. Xplained Pro Segment LCD Connector
Description Function Pin Pin Function Description
Common terminal 3 COM3 1 2 COM2 Common terminal 2
Common terminal 1 COM1 3 4 COM0 Common terminal 0
Segment 0 SEG0 5 6 SEG1 Segment 1
Segment 2 SEG2 7 8 SEG3 Segment 3
Segment 4 SEG4 9 10 SEG5 Segment 5
Segment 6 SEG6 11 12 SEG7 Segment 7
Segment 8 SEG8 13 14 SEG9 Segment 9
Segment 10 SEG10 15 16 SEG11 Segment 11
Segment 12 SEG12 17 18 SEG13 Segment 13
Segment 14 SEG14 19 20 SEG15 Segment 15
Segment 16 SEG16 21 22 SEG17 Segment 17
Segment 18 SEG18 23 24 SEG19 Segment 19
Segment 20 SEG20 25 26 SEG21 Segment 21
Segment 22 SEG22 27 28 SEG23 Segment 23
Segment 24 SEG24 29 30 SEG25 Segment 25
Segment 26 SEG26 31 32 SEG27 Segment 27
Segment 28 SEG28 33 34 SEG29 Segment 29
Segment 30 SEG30 35 36 SEG31 Segment 31
Segment 32 /
QTouch X-line 2
SEG32 / QT_X2 37 38 SEG33 / QT_Y2 Segment 33 /
QTouch Y-line 2
Segment 34 /
QTouch X-line 1
SEG34 / QT_X1 39 40 SEG35 / QT_Y1 Segment 35 /
QTouch Y-line 1
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Description Function Pin Pin Function Description
Segment 36 /
SEG36 / QT_X0 41 42 SEG37 / QT_Y0 Segment 37 /
QTouch X-line 0
Common terminal 4 COM4 43 44 COM5 Common terminal 5
Common terminal 6 COM6 45 46 COM7 Common terminal 6
Backlight anode Backlight V+ 47 48 Backlight V- Backlight cathode
Backlight control Backlight CTRL 49 50 ID Xplained Pro ID
Ground GND 51
3.5.3. Xplained Pro Power Header
The power header can be used to connect external power to the SAM L22 Xplained Pro kit. The kit will
automatically detect and switch to any external power if supplied. The power header can also be used as
supply for external peripherals or extension boards. Care must be taken not to exceed the total current
limitation of the on-board regulator when using the 3.3V pin.
Table 3-6. Xplained Pro Power Header
Pin number Pin name Description
1 VEXT_P5V0 External 5V input
2 GND Ground
3 VCC_P5V0 Unregulated 5V (output, derived from one of the input sources)
QTouch Y-line 0
4 VCC_P3V3 Regulated 3.3V (output, used as main power supply for the kit)
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4. Hardware User Guide
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
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
4.2. Connectors
Related Links
Power Sources on page 11
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.
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Figure 4-2. SAM L22 Xplained Pro Connector Overview
4.2.1. Xplained Pro Standard Extension Headers
The SAM L22 Xplained Pro headers EXT1, EXT2, and EXT3 offer access to the I/O of the microcontroller
in order to expand the board, e.g. by connecting extensions to the board. These headers are based on
the standard extension header specified in the table below. The headers have a pitch of 2.54mm.
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Table 4-1. Extension Header EXT1
EXT1 pin SAM L22
Function Shared functionality
pin
1 [ID] - - Communication line to the ID
chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA02 AIN[0] -
4 [ADC(-)] PA03 AIN[1] Shield
5 [GPIO1] PA20 GPIO (RTS) -
6 [GPIO2] PA21 GPIO (CTS) -
7 [PWM(+)] PB08 TC0/WO[0] -
8 [PWM(-)] PB09 TC0/WO[1] -
9 [IRQ/GPIO] PC02 IRQ10/GPIO -
10 [SPI_SS_B/GPIO] PC03 GPIO -
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT2, EXT3, Shield, Crypto, and
EDBG I²C
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT2, EXT3, Shield, Crypto, and
EDBG I²C
13 [USART_RX] PA23 SERCOM2 PAD[1] UART RX -
14 [USART_TX] PA22 SERCOM2 PAD[0] UART TX -
15 [SPI_SS_A] PB21 SERCOM3 PAD[1] SPI SS -
16 [SPI_MOSI] PB00 SERCOM3 PAD[2] SPI MOSI -
17 [SPI_MISO] PB02 SERCOM3 PAD[0] SPI MISO -
18 [SPI_SCK] PB01 SERCOM3 PAD[3] SPI SCK -
19 [GND] - - Ground
20 [VCC] - - Power for extension board
Table 4-2. Extension Header EXT2
EXT2 pin SAM L22
Function Shared functionality
pin
1 [ID] - - Communication line to the ID
chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA04 AIN[4] Shield
4 [ADC(-)] PA05 AIN[5] Shield
5 [GPIO1] PB04 GPIO EDBG GPIO0, SLCD, and XAM
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EXT2 pin SAM L22
Function Shared functionality
pin
6 [GPIO2] PB05 GPIO EDBG GPIO1, SLCD, and XAM
7 [PWM(+)] PC28 TCC0/WO[4] SLCD
8 [PWM(-)] PA27 TCC0/WO[5] SLCD
9 [IRQ/GPIO] PC00 IRQ8/GPIO Shield and EDBG GPIO2
10 [SPI_SS_B/GPIO] PC01 GPIO Shield, User SW0, and EDBG
GPIO3
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT3, Shield, Crypto, and
EDBG I²C
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT3, Shield, Crypto, and
EDBG I²C
13 [USART_RX] PA13 SERCOM3 PAD[1] UART RX -
14 [USART_TX] PA12 SERCOM3 PAD[0] UART TX -
15 [SPI_SS_A] PA17 SERCOM1 PAD[1] SPI SS -
16 [SPI_MOSI] PA18 SERCOM1 PAD[2] SPI MOSI -
17 [SPI_MISO] PA16 SERCOM1 PAD[0] SPI MISO -
18 [SPI_SCK] PA19 SERCOM1 PAD[3] SPI SCK -
19 [GND] - - Ground
20 [VCC] - - Power for extension board
Table 4-3. Extension Header EXT3
EXT3 pin SAM L22
Function Shared functionality
pin
1 [ID] - - Communication line to the ID
chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA06 AIN[8] SLCD
4 [ADC(-)] PA07 AIN[9] SLCD
5 [GPIO1] PC16 GPIO SLCD
6 [GPIO2] PC17 GPIO SLCD
7 [PWM(+)] PB16 TC2/WO[0] SLCD
8 [PWM(-)] PB17 TC2/WO[1] SLCD
9 [IRQ/GPIO] PB18 IRQ2/GPIO SLCD
10 [SPI_SS_B/GPIO] PB19 GPIO SLCD
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EXT3 pin SAM L22
pin
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT2, Shield, Crypto, and
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT2, Shield, Crypto, and
13 [USART_RX] PA15 SERCOM4 PAD[3] UART RX SLCD
14 [USART_TX] PA14 SERCOM4 PAD[2] UART TX SLCD
15 [SPI_SS_A] PA09 SERCOM0 PAD[1] SPI SS SLCD
16 [SPI_MOSI] PA10 SERCOM0 PAD[2] SPI MOSI SLCD
17 [SPI_MISO] PA08 SERCOM0 PAD[0] SPI MISO SLCD
18 [SPI_SCK] PA11 SERCOM0 PAD[3] SPI SCK SLCD
19 [GND] - - Ground
20 [VCC] - - Power for extension board
4.2.2. Segment LCD Connector
Extension connector EXT5 is a special connector for segment LCD displays. SAM L22 Xplained Pro
implements one segment LCD extension connector for Xplained Pro extensions and supports up to eight
COM, twenty seven SEG and six touch signals. The connector has a standardized pin-out as shown in
the table below.
Function Shared functionality
EDBG I²C
EDBG I²C
Table 4-4. Segment LCD Display Connector EXT5
EXT5 pin SAM L22 pin Function Shared functionality
1 [COM3] PC06 SLCD/ LP[9] Shield
2 [COM2] PC05 SLCD/ LP[8] Shield
3 [COM1] PA07 SLCD/ LP[7] Shield and EXT3
4 [COM0] PA06 SLCD/ LP[6] Shield and EXT3
5 [SEG0] PA11 SLCD/ LP[14] EXT3
6 [SEG1] PC08 SLCD/ LP[15]
7 [SEG2] PC09 SLCD/ LP[16]
8 [SEG3] PC10 SLCD/ LP[17]
9 [SEG4] PC11 SLCD/ LP[18] Shield and Shield (2)
10 [SEG5] PC12 SLCD/ LP[19] Shield and Shield (2)
11 [SEG6] PC13 SLCD/ LP[20] Shield and Shield (2)
12 [SEG7] PB11 SLCD/ LP[21] Shield
13 [SEG8] PB12 SLCD/ LP[22] Shield
14 [SEG9] PB13 SLCD/ LP[23] Shield
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EXT5 pin SAM L22 pin Function Shared functionality
15 [SEG10] PB14 SLCD/ LP[24] Shield
16 [SEG11] PB15 SLCD/ LP[25] Shield
17 [SEG12] PC14 SLCD/ LP[26] Shield
18 [SEG13] PC15 SLCD/ LP[27] Shield
19 [SEG14] PA14 SLCD/ LP[30] EXT3
20 [SEG15] PA15 SLCD/ LP[31] EXT3
21 [SEG16] PC16 SLCD/ LP[36] EXT3
22 [SEG17] PC17 SLCD/ LP[37] EXT3
23 [SEG18] PC18 SLCD/ LP[38]
24 [SEG19] PC19 SLCD/ LP[39]
25 [SEG20] PC20 SLCD/ LP[40]
26 [SEG21] PC21 SLCD/ LP[41]
27 [SEG22] PB16 SLCD/ LP[42] EXT3
28 [SEG23] PB17 SLCD/ LP[43] EXT3
29 [SEG24] PB18 SLCD/ LP[44] EXT3
30 [SEG25] PB19 SLCD/ LP[45] EXT3
31 [SEG26] PB20 SLCD/ LP[46] Shield
32 [SEG27] -
33 [SEG28] -
34 [SEG29] -
35 [SEG30] -
36 [SEG31] -
37 [SEG32/
PB07 PTC/XY[13]
QT_X2 ]
38 [SEG33/
PB04 PTC/XY[10] EDBG GPIO0, EXT2, and XAM
QT_Y2]
39 [SEG34/
PB06 PTC/XY[12] QTBTN1
QT_X1]
40 [SEG35/
PB05 PTC/XY[11] EDBG GPIO1, EXT2, and XAM
QT_Y1]
41 [SEG36/
PC28 PTC/XY[20] EXT2
QT_X0]
42 [SEG37/
PA27 PTC/XY[21] EXT2
QT_Y0]
43 [COM4] PC07 SLCD/ LP[10] Shield
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EXT5 pin SAM L22 pin Function Shared functionality
44 [COM5] PA08 SLCD/ LP[11] EXT3
45 [COM6] PA09 SLCD/ LP[12] EXT3
46 [COM7] PA10 SLCD/ LP[13] EXT3
47 [Backlight V+]- VCC_P3V3
48 [Backlight
- GND
V-]
49 [Backlight
PC27 TC3/WO[1] User LED0
CTRL]
50 [ID] - Xplained Pro ID Communication line to ID chip on extension board
51 [GND] - GND
4.2.3. Arduino Connector Footprint
SAM L22 Xplained Pro implements Arduino shield connectors footprints based on the Arduino Uno. All
references to Arduino pin names are taken from the official Arduino schematics of the Arduino Uno.
Info: Note that all pins do not have the exact same functionality as on the Arduino Uno on the
shield connectors. Each shield should be checked for compatibility before it is connected.
Table 4-5. J902 - Power
J902 pin SAM L22
Arduino pin name Function Shared functionality
pin
1 - RFU - -
2 - IOREF VCC_TARGET_P3V3 -
3 RESETN RESET TARGET_RESET Shield, EDBG, and
Cortex® Debug
4 - 3.3V VCC_TARGET_P3V3 -
5 - 5V VCC_P5V0 -
6 - GND GND -
7 - GND GND -
8 - VIN VCC_EXT_P5V0 -
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Table 4-6. J903 - Analog
J903 pin SAM L22
Arduino pin name Function Shared functionality
pin
1 PC00 ADC0 AIN16 EXT2 and EDBG GPIO2
2 PC01 ADC1 AIN17 EXT2, User SW0, and
EDBG GPIO3
3 PA04 ADC2 AIN4 EXT2
4 PA05 ADC3 AIN5 EXT2
5 PA06 ADC4 AIN6 EXT3 and SLCD
6 PA07 ADC5 AIN7 EXT3 and SLCD
Table 4-7. J904 - Digital Low
J904 pin SAM L22
Arduino pin name Function Shared functionality
pin
1 PB13 D0 / RX0 SERCOM3 PAD[1]
SLCD
UART RX
2 PB12 D1 / TX0 SERCOM3 PAD[0]
SLCD
UART TX
3 PB11 D2 GPIO SLCD
4 PB14 D3 GPIO SLCD
5 PB15 D4 GPIO SLCD
6 PC14 D5 GPIO SLCD
7 PC15 D6 GPIO SLCD
8 PB20 D7 GPIO SLCD
Table 4-8. J901 - Digital High
J901 pin SAM L22
Arduino pin name Function Shared functionality
pin
1 PC05 D8 GPIO SLCD
2 PC06 D9 GPIO SLCD
3 PC07 D10 / SPI-SS GPIO SLCD
4 PC12 D11 / SPI-MOSI SERCOM1 PAD[0] SPI
SLCD and Shield
MOSI
5 PC11 D12 / SPI-MISO SERCOM1 PAD[3] SPI
SLCD and Shield
MISO
6 PC13 D13 / SPI-SCK SERCOM1 PAD[1] SPI
SLCD and Shield
SCK
7 - GND - -
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J901 pin SAM L22
Arduino pin name Function Shared functionality
pin
8 PA03 AREF ADC / DAC VREFA EXT1
9 PB30 SDA SERCOM5 PAD[0] I²C
SDA
10 PB31 SCL SERCOM5 PAD[1] I²C
SCL
Table 4-9. J900 - SPI
J900 pin SAM L22
Arduino pin name Function Shared functionality
EXT1, EXT2, EXT3,
Crypto, and EDBG I²C
EXT1, EXT2, EXT3,
Crypto, and EDBG I²C
pin
1 PC11 MISO SERCOM1 PAD[3] SPI
SLCD and Shield
MISO
2 - 5V VCC_P5V0 -
3 PC13 SCK SERCOM1 PAD[1] SPI
SLCD and Shield
SCK
4 PC12 MOSI SERCOM1 PAD[0] SPI
SLCD and Shield
MOSI
5 RESETN RESET TARGET_RESET Shield, EDBG, and
Cortex Debug
6 - GND GND -
4.2.4. USB
The SAM L22 Xplained Pro has a Micro-USB connector for use with the SAM L22 USB module labeled
as TARGET USB on the kit. To be able to detect when a target USB cable is connected in self-powered
mode, a GPIO is used to detect the VBUS voltage on the connector.
Table 4-10. USB Connections
SAM L22 pin USB function
PC26 VBUS Detection
PA24 USB D-
PA25 USB D+
4.2.5. Cortex Debug Connector
SAM L22 Xplained Pro has a 10-pin 50-mil Cortex® Debug Connector that can be used to attach external
debuggers to the ATSAML22N18A.
Table 4-11. Cortex Debug Connector
Cortex Debug
Connector pin
1 VCC_TARGET_P3V3 ATSAML22N18A voltage
2 PA31 SWD data signal EDBG SWD
Pin / Net Function Shared functionality
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Cortex Debug
Pin / Net Function Shared functionality
Connector pin
3 GND Ground
4 PA30 SWD clock signal EDBG SWD
5 GND Ground
6 - -
7 - -
8 - -
9 GND Ground
10 RESETN Target reset signal Shield, Shield2, and
4.2.6. Current Measurement Header
An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of
the SAM L22 Xplained Pro. All power to the ATSAML22N18A 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
ATSAML22N18A to be powered through its I/O pins. This may cause permanent damage to the
device.
EDBG
4.3. Peripherals
4.3.1. Crystal
The SAM L22 Xplained Pro kit contains a 32.768kHz crystal that can be used as clock source for the
SAM L22 device. The 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 the AVR4100 application note from Atmel.
Table 4-12. External 32.768kHz Crystal
SAM L22 pin Function
PA00 XIN32
PA01 XOUT32
4.3.2. Mechanical Buttons
SAM L22 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to
the SAM L22 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.
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Info: There is no pull-up resistor connected to the generic user button. Remember to enable
the internal pull-up in the SAM L22 to use the button.
Table 4-13. Mechanical Buttons
SAM L22 pin Silkscreen text Shared functionality
RESET RESET
PC01 SW0 EXT2, Shield, and EDBG GPIO3
4.3.3. LED
There is one yellow LED available on the SAM L22 Xplained Pro board that can be turned ON and OFF.
The LED can be activated by driving the connected I/O line to GND.
Table 4-14. LED Connection
SAM L22 pin Function Shared functionality
PC27 Yellow LED0 SLCD
4.3.4. QTouch Button
There is one self capacitance button available on the SAM L22 Xplained Pro board that can be used as
I/O. This QTouch button is intended to be driven by the built-in Peripheral Touch Controller (PTC) of the
device.
Info: To get started with QTouch, refer to Atmel QTouch® Library and Atmel QTouch
Composer.
Table 4-15. QTouch Connection
SAM L22 pin Silkscreen text Shared functionality
PB06 QT BTN1 SLCD
4.3.5. Backup Super Capacitor
The SAM L22 Xplained Pro has a backup super capacitor for use with the SAM L22 backup system. The
super capacitor can be connected to the device by placing a jumper over pin 1-2 on the 3-pin VBAT
SELECT header.
By default the jumper is placed over pin 2-3 to select the board power supply. This configuration is
selected to avoid draining the super capacitor and can be used during development.
Due to the high capacitive load represented by the super capacitor, a 220Ω limiting resistor is added to
reduce inrush current. The charging supply is the targets main supply and a low-power opamp is used for
disconnecting the charger input when removing power. This is added to avoid a current leak back to the
main supply from the super capacitor when power is removed.
A full charge of the super capacitor from empty will take approximately 45 seconds and can supply the
target device in backup mode with ULP running for up to 24 hours. Other modes are not characterized,
but will reduce the available time in backup mode respectively. For more information about the current
consumption in other modes, refer to the electrical characteristics chapter in the SAM L22 datasheet.
®
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Table 4-16. VBAT SELECT Header
VBAT SELECT pin Function
1 Power from super capacitor (47mF)
2 PB03/VBAT pin on SAM L22
3 Power from board supply
4.3.6. Crypto Device
Several of the Atmel security devices require only an I2C interface to work, and they share the same
packages and pin-outs. SAM L22 Xplained Pro implements a DFN8 footprint for these devices so the
user may test the mounted ATECC508A device or solder in other CryptoAuthentication devices. The table
below shows all the connections between the ATECC508A and the ATSAML22N18A.
Table 4-17. Crypto Device Connections
ATECC508A
pin
1 [NC] - - -
2 [NC] - - -
3 [NC] - - -
4 [GND] - GND -
5 [SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT2, EXT3, Shield, and
6 [SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT2, EXT3, Shield, and
7 [NC] - -
8 [VCC] - VCC_TARGET_P3V3 -
9 [PAD] - GND -
4.3.7. Tamper Detection
The ATSAML22N18A supports up to five selectable external inputs and one output that can be used for
tamper detection. When tamper is detected a time stamp is logged and an interrupt is raised. The output
pin can be used for PCB active layer detection, when enabled a bit pattern is applied to the output pin, if
this pattern is not received at an input pin a tamper is detected.
SAM L22 pin Function Shared functionality
EDBG I²C
EDBG I²C
All tamper inputs and the output is connected to EXT1 and EXT2. Using a jumper between PB01 and an
input can emulate for example the chassis of a product being opened or a modification to a PCB.
For more details about how the tamper functionality works, see the SAM L22 datasheet.
Table 4-18. Tamper Detection
SAM L22 pin Tamper name Shared functionality
PC00 IN[3] EXT2 pin 9, Shield, and EDBG GPIO2
PC01 IN[4] EXT2 pin 10, Shield, User SW0, and EDBG GPIO3
PA02 IN[2] EXT1 pin 3
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SAM L22 pin Tamper name Shared functionality
PB00 IN[0] EXT1 pin 16
PB01 OUT EXT1 pin 18
PB02 IN[1] EXT1 pin 17
4.4. Embedded Debugger Implementation
SAM L22 Xplained Pro contain an Embedded Debugger (EDBG) that can be used to program and debug
the ATSAML22N18A using Serial Wire Debug (SWD). The Embedded Debugger also include a Virtual
Com port interface over UART, an Atmel Data Gateway Interface over SPI, and I2C and it includes four of
the SAM L22 GPIOs. The kit also includes an XAM extension processor to the Embedded Debugger for
on-board current measurement. Atmel Studio can be used as a front end for the Embedded Debugger.
4.4.1. Serial Wire Debug
The Serial Wire Debug (SWD) use two pins to communicate with the target. For further information on
how to use the programming and debugging capabilities of the EDBG, see Embedded Debugger on page
8.
Table 4-19. SWD Connections
SAM L22 pin Function Shared functionality
PA30 SWD clock Cortex Debug
PA31 SWD data Cortex Debug
4.4.2. Virtual COM Port
The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAML22N18A
UARTs. For further information on how to use the Virtual COM port, see Embedded Debugger on page 8.
Table 4-20. Virtual COM Port Connections
SAM L22 pin Function Shared functionality
PC24 SERCOM4 PAD[2] UART TXD (SAM
L22 TX line)
PC25 SERCOM4 PAD[3] UART RXD (SAM
L22 RX line)
4.4.3. Atmel Data Gateway Interface
The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a SPI or I²C.
The DGI can be used to send a variety of data from the ATSAML22N18A to the host PC. For further
information on how to use the DGI interface, see Atmel Data Visualizer and the EDBG User Guide.
-
-
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Table 4-21. DGI Interface Connections when using SPI
SAM L22 pin Function Shared functionality
PB25 SERCOM5 PAD[1] SPI SS (Slave
-
select) (SAM L22 is Master)
PB24 SERCOM5 PAD[0] SPI MISO (Master
-
In, Slave Out)
PB22 SERCOM5 PAD[2] SPI MOSI (Master
-
Out, Slave in)
PB23 SERCOM5 PAD[3] SPI SCK (Clock Out) -
Table 4-22. DGI Interface Connections when using I²C
SAM L22 pin Function Shared functionality
PB30 SERCOM5 PAD[0] SDA (Data line) EXT1, EXT2, EXT3, Shield, and Crypto
PB31 SERCOM5 PAD[1] SCL (Clock line) EXT1, EXT2, EXT3, Shield, and Crypto
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time
stamp pin value changes. This makes it possible to accurately time stamp events in the SAM L22
application code. For further information on how to configure and use the GPIO monitoring features, see
Atmel Data Visualizer and the EDBG User Guide.
Table 4-23. GPIO Lines Connected to the EDBG
SAM L22 pin Function Shared functionality
PB04 GPIO0 SLCD, EXT2, and XAM
PB05 GPIO1 SLCD, EXT2, and XAM
PC00 GPIO2 Shield and EXT2
PC01 GPIO3 User SW0, Shield, and EXT2
4.4.4. XAM Configuration
On the SAM L22 Xplained Pro the MCU and the MCU peripherals (e.g. extensions) are powered by its
own regulator as shown in the figure below. All other parts of the board, mainly embedded debugger and
accompanying Xplained Pro Analog Module (XAM), are powered from a separate regulator. The current
to the MCU and peripherals can be measured by connecting them to the XAM output through jumper
settings.
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Figure 4-3. SAM L22 Xplained Pro XAM Implementation Block Diagram
Xplained Pro MCU power
measurement jumper
Target
Peripherals
Current measurement
bypass jumper selection
Xplained Pro Analog
Module (XAM)
Target
Regulator
Target MCU
On the SAM L22 Xplained Pro the XAM can be used in four configurations:
1. No current measurement or external MCU current measurement: The XAM is bypassed and
thus the MCU and peripherals are supplied directly by the regulator. Set both jumpers in the
"BYPASS" position. In this configuration it is also possible to connect external measurement tools
on the Xplained Pro MCU power measurement header to measure MCU current directly instead of
using the XAM.
2. MCU current measurement: The XAM measures only the MCU current while the peripherals are
supplied directly by the regulator. For this configurations place the jumper for "I/O" (peripherals) into
the "BYPASS" position and the "MCU" into the "MEASURE" position.
3. Peripherals measurement: The XAM measures only the peripherals current while the MCU is
directly supplied by the regulator. For this configuration place the jumper for "MCU" into the
"BYPASS" position and the "I/O" jumper into the "MEASURE" position.
4. MCU and peripherals measurement: In this configuration both MCU and peripherals are
measured by the XAM. Place both jumpers on "I/O" and "MCU" headers in the "MEASURE"
position.
4.5. Kit Modifications
SAM L22 Xplained Pro has several resistors that can be used to disconnect I/O pins of the
ATSAML22N18A from connectors and on-board ICs and to disconnect power signals.
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Info: Note that there are some resistors that aren't mounted by default on the kit listed in the
table below.
Table 4-24. Zero Ohm Resistors
DesignatorValue From To Comment
J100 cut-strap VCC_P3V3 VCC_P3V3_CM_IN ATSAML22N18A, peripherals
and connectors power supply
R107 0R U100 OUT VCC_CM_P3V3 XAM power supply
R108 0R U100 OUT VCC_EDBG_P3V3 EDBG power supply
R305 0R U302 SDA PB30 I2C SDA Allows complete or partial
R307 0R U302 SCL PB31 I2C SCL
disconnect of U302, ATECC508A
from ATSAML22N18A
R400 39R EDBG TARGET
RESET
TARGET MCU
RESET
Debug interface from the EDBG
to the ATSAML22N18A
R404 0R EDBG SWCLK PA30 SWCLK
R405 0R EDBG SWDIO PA31 SWDIO
R601 0R XAM ADC_SYNC1 PB04 GPIO XAM ADC sync interfaces to the
R600 0R XAM ADC_SYNC2 PB05 GPIO
ATSAML22N18A.
R406 0R EDBG CDC RX PC24 UART TX EDBG CDC and DGI interfaces
R407 0R EDBG I2C SDA PB30 I2C SDA
to the ATSAML22N18A
R408 0R EDBG I2C SCL PB31 I2C SCL
R414 330R EDBG CDC TX PC25 UART RX
R415 0R EDBG SPI MOSI PB22 SPI MOSI
R416 330R EDBG DGI_GPIO0 PB04 GPIO
R417 330R EDBG DGI_GPIO1 PB05 GPIO
R418 330R EDBG DGI_GPIO2 PC00 GPIO
R419 330R EDBG DGI_GPIO3 PC01 GPIO
R420 330R EDBG SPI MISO PB24 SPI MISO
R425 0R EDBG SPI SCK PB23 SPI SCK
R426 0R EDBG SS PB25 SPI SS
R427 0R TARGET RESET
TARGET_MCU_RESETReset sense signal to EDBG,
SENSE
R900 0R TARGET MCU
RESET UNO ATSAML22N18A reset signal to
RESET
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Arduino connectors
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Figure 4-4. Assembly Drawing Top
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Figure 4-5. Assembly Drawing Bottom
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4.5.1. Operation at Other Voltages
The SAM L22 Xplained Pro board is operated at 3.3V by default, but it also has the possibility of running
at lower voltages from an external supply. The EDBG is designed to run from a 3.3V supply and won't
work on other voltages, therefore all connections from the EDBG and the on board 3.3V regulator to the
ATSAML22N18A should be removed.
To completely disconnect the EDBG and the on-board power supply from the ATSAML22N18A do the
following:
• Remove the two jumpers from the on-board 3-pin current measurement headers (J101 and J102),
and connect the two center pins (pin 2) together with a wire or an ammeter as shown in Figure 4-7
SAM L22 Xplained Pro Current Measurement Headers on page 34
• Remove R400, R404, R405, R406, R407, R408, R414, R415, R416, R417, R418, R419, R420,
R425, R426, R427, R600, R601
• Optionally cut J100 to remove power to the on-board current measurement headers (J101 and
J102) from the on-board regulator
Figure 4-6 SAM L22 Xplained Pro EDBG Disconnect on page 33 shows all components that have to be
removed from the bottom side of the PCB for operation at other voltages. To locate the other components,
see the assembly drawing in the section above. When the components are removed, the kit can be
supplied with a desired voltage through the pins marked 3.3V (pin four) and GND (pin two) on the
Xplained Pro power header. To program and debug the ATSAML22N18A the 2x5 50mil Cortex debug
connector has to be used with an external debugger.
Info: Operating the ATSAML22N18A on other voltages than 3.3V requires physical
modifications on the kit using a soldering iron and an external debugger for programming the
ATSAML22N18A. The on-board current measurement only works at 3.3V. The on-board LED is
selected for 3.3V operation, the light level at 1.8V operation is very low. To increase the emitted
light level the value of the series resistor can be lowered. The EDBG functionality can be
restored by re-soldering the removed components and soldering a 0Ω resistor over J100.
Caution: The voltage supplied through the power header is applied directly to the
ATSAML22N18A and the extension headers, applying a voltage greater than 3.3V may damage
the board permanently.
Figure 4-6. SAM L22 Xplained Pro EDBG Disconnect
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Figure 4-7. SAM L22 Xplained Pro Current Measurement Headers
Related Links
Xplained Pro Power Header on page 14
Cortex Debug Connector on page 23
Connectors on page 15
Atmel SAM L22 Xplained Pro [USER GUIDE]
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5. Appendix
5.1. Getting Started with IAR
IAR Embedded Workbench® for ARM® is a proprietary high efficiency compiler not based on GCC.
Programming and debugging of Xplained Pro kits are supported in IAR™ Embedded Workbench for ARM
using the common CMSIS-DAP interface. Some initial settings have to be set up in the project to get the
programming and debugging to work.
The following steps will explain how to get your project ready for programming and debugging:
1. Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the
project.
2. In the category General Options, select the Target tab. Select the device for the project or, if not
listed, the core of the device.
3. In the category Debugger, select the Setup tab. Select CMSIS DAP as the driver.
4. In the category Debugger, select the Download tab. Check the check box for Use flash loader(s)
option.
5. In the category Debugger > CMSIS DAP, select the Setup tab. Select System (default) as the
reset method.
6. In the category Debugger > CMSIS DAP, select the JTAG/SWD tab. Select SWD as the interface
and optionally select the SWD speed.
Figure 5-1. Select Target Device
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Figure 5-2. Select Debugger
Figure 5-3. Configure Flash Loader
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Figure 5-4. Configure Reset
Figure 5-5. Configure Interface
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5.2. Connecting a SAM-ICE to an Xplained Pro Board
Xplained Pro kits featuring a 10-pin 50mil debug connector can use external debug tools like SAM-ICE
or Atmel-ICE instead of the built-in EDBG. Devices using SWD interface on-board will have a connector
with the pinout compatible with the Cortex Debug Connector.
You can connect the SAM-ICE to the debug connector on an Xplained Pro using either an Atmel-ICE
adapter, SAM-ICE adapter, or a 10-pin 50-mil header to squid cable. When using a squid cable, see the
table and figures below for how to connect the SAM-ICE to the Xplained Pro board.
Table 5-1. Squid Cable Connections
Squid Cable pin SAM-ICE pin
1 (VCC) 1 (VTref)
2 (SWDIO/TMS) 7 (TMS)
3 (GND) 4 (GND)
4 (SWCLK/TCK) 9 (TCK)
5 (GND) 6 (GND)
6 (SWO/TDO) 13 (TDO)
7 (Not used)
8 (Not used)
™
(1)
9 (Not used)
10 (RESET) 15 (RESET)
Note:
1. Optional, if the device has this functionality.
Figure 5-6. SAM-ICE using a Squid Cable
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Figure 5-7. SAM-ICE using an Atmel-ICE Adapter
Important:
If contention with the on-board EDBG occur, power the Xplained Pro board from another input
like the external power header or from the target USB. Physically removing the connection
between the EDBG and the debug header by removing 0Ω resistors, where available, or cutting
the tracks to the EDBG can also be done.
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6. Hardware Revision History and Known Issues
6.1. Identifying Product ID and Revision
The revision and product identifier of Xplained Pro boards can be found in two ways; either through Atmel
Studio or by looking at the sticker on the bottom side of the PCB.
By connecting an Xplained Pro MCU board to a computer with Atmel Studio running, an information
window will pop up. The first six digits of the serial number, which is listed under kit details, contain the
product identifier and revision. Information about connected Xplained Pro extension boards will also
appear in the Atmel Kit's window.
The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the
identifier and revision in plain text as A09-nnnn\rr, where nnnn is the identifier and rr is the revision.
Boards with limited space have a sticker with only a QR-code, which contains a serial number string.
The serial number string has the following format:
"nnnnrrssssssssss"
n = product identifier
r = revision
s = serial number
The product identifier for SAM L22 Xplained Pro is A09-2547.
6.2. Revision 4
Touch SLCD1 Xplained Pro (ATTSLCD1-XPRO) is bundled and shipped together with revision 4 of SAM
L22 Xplained Pro.
ATSAML22N18A device revision B (or later) is mounted on revision 4 of SAM L22 Xplained Pro.
Pin-out changes have been made to the kit to get the correct functionality on the headers and connectors
for revision B of the ATSAML22N18A device. See revision 2 for more details.
6.3. Revision 2
Revision 2 is the initially released revision.
Segment LCD1 Xplained Pro (ATSLCD1-XPRO) is bundled and shipped together with revision 2 of SAM
L22 Xplained Pro.
ATSAML22N18A device revision A is mounted on revision 2 of SAM L22 Xplained Pro.
Known issues:
• PTC functions that only work for revision A of the ATSAML22N18A device:
– PC00 PTC/XY[4]
– PC01 PTC/XY[5]
• VBAT input pin:
– Revision 2 of SAM L22 Xplained Pro does not have decoupling capacitors mounted.
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6.3.1. Pin-out Changes
The table below shows the pin-out differences between revision 2 and revision 4 of the SAM L22
Xplained Pro. The table refers to the net names on the kit as used in the schematics.
Table 6-1. Pin-out Changes from Revision 2 to Revision 4
Connector/Pin Revision 2 Revision 4
EXT2-09 PB06_GPIO_IRQ6 (PTC/XY[12]) PC00_GPIO_IRQ8
EXT2-10 PB07_GPIO_SS (PTC/XY[13]) PC01_GPIO_SS_SW0
EXT5-39 PC00_QTBTN1_SLCDX1 (PTC/XY[4]) PB06_QTBTN1_SLCDX1 (PTC/XY[12])
EXT5-37 PC01_SW0_SLCDX2 (PTC/XY[5]) PB07_SLCDX2 (PTC/XY[13])
EXT5-38 PB05_GPIO_SLCDY2 (PTC/XY[11]) PB04_GPIO_SLCDY2 (PTC/XY[10])
EXT5-40 PB04_GPIO_SLCDY1 (PTC/XY[10]) PB05_GPIO_SLCDY1 (PTC/XY[11])
DGI_GPIO2 PB06_GPIO_IRQ6 (PTC/XY[12]) PC00_GPIO_IRQ8
DGI_GPIO3 PB07_GPIO_SS (PTC/XY[13]) PC01_GPIO_SS_SW0
QT_BTN1 PC00_QTBTN1_SLCDX1 (PTC/Y[4]) PB06_QTBTN1_SLCDX1 (PTC/XY[12])
6.3.2. CryptoAuthentication Device
SAM L22 Xplained Pro revision 2 has the ATAES132A CryptoAuthentication device mounted. The table
below shows all the connections between the ATAES132A and the ATSAML22N18A for revision 2.
To disconnect the AUTHO pin from PC21, remove the R301. To locate the resistor, see Figure 6-1
Revision 2 Assembly Drawing Top on page 42.
Table 6-2. CryptoAuthentication Device Connections
ATAES132A
SAM L22 pin Function Shared functionality
pin
1 [NC] - GND -
2 [AUTHO] PC21 GPIO/EIC SLCD
3 [NC] - -
4 [GND] - GND -
5 [SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT2, EXT3, Shield, and
EDBG I²C
6 [SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT2, EXT3, Shield, and
EDBG I²C
7 [NC] - -
8 [VCC] - VCC_TARGET_P3V3 -
PAD - GND -
6.3.3. Assembly Drawings
Assembly drawings for kit modifications on revision 2 of SAM L22 Xplained Pro.
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Figure 6-1. Revision 2 Assembly Drawing Top
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Figure 6-2. Revision 2 Assembly Drawing Bottom
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7. Document Revision History
Doc. rev. Date Comment
42474B 12/2015 Bug fix on hardware. See Hardware Revision History and Known Issues
on page 40 for changes.
42474A 08/2015 Initial document release.
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8. Evaluation Board/kit Important Notice
This evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,
DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not
(yet) comply with some or any technical or legal requirements that are applicable to finished products,
including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,
CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS,"
without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all
responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel
from all claims arising from the handling or use of the goods. Due to the open construction of the
product, it is the user's responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL
SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of Atmel covering or
relating to any machine, process, or combination in which such Atmel products or services might be or
are used.
Mailing Address:
Atmel Corporation
1600 Technology Drive
San Jose, CA 95110
USA
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Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com
©
2015 Atmel Corporation. / Rev.: Atmel-42474B-SAM-L22-Xplained-Pro_User Guide-12/2015
Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, AVR®, QTouch®, and others are registered trademarks or trademarks of Atmel
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