SAM L22 Xplained Pro Preface SMART ARM-based Microcontrollers USER GUIDE

SAM L22 Xplained Pro Preface SMART ARM-based Microcontrollers USER GUIDE
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.
Atmel-42474B-SAM-L22-Xplained-Pro_User Guide-12/2015
Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................ 4
1.1.
1.2.
Features....................................................................................................................................... 4
Kit Overview................................................................................................................................. 4
2. Getting Started...........................................................................................................6
2.1.
2.2.
Xplained Pro Quick Start.............................................................................................................. 6
Design Documentation and Relevant Links................................................................................. 6
3. Xplained Pro.............................................................................................................. 8
3.1.
3.2.
3.3.
3.4.
3.5.
Embedded Debugger................................................................................................................... 8
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
Hardware Identification System..................................................................................................10
Power Sources........................................................................................................................... 11
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.
4.2.
4.3.
4.4.
Power Distribution...................................................................................................................... 15
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
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
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.
4.5.
XAM Configuration.......................................................................................................28
Kit Modifications......................................................................................................................... 29
4.5.1.
Operation at Other Voltages........................................................................................ 33
5. Appendix..................................................................................................................35
5.1.
5.2.
Getting Started with IAR.............................................................................................................35
Connecting a SAM-ICE to an Xplained Pro Board..................................................................... 38
6. Hardware Revision History and Known Issues........................................................40
6.1.
6.2.
6.3.
Identifying Product ID and Revision........................................................................................... 40
Revision 4...................................................................................................................................40
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
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1.2.
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
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.
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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.
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IAR Embedded Workbench for ARM - This is a commercial C/C++ compiler that is available for
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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.
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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.
Activity indicator, LED flashes
when any communication
happens to the EDBG.
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.
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
Current output
The Xplained Pro Analog Module (XAM) extends the embedded debugger with high dynamic range
current measurement. This enables power profiling of the target system.
Calibration
circuitry
GPIO(s)
Control MCU
Sync
GPIO
I2C
Calibration ON/OFF
GPIO
SPI
EDBG
Clock sync
Range selection
voltage
reference
2.7V
SWD
AREF
100 Ohm
100 mOhm
Pre-amplifier
2x
ADC0
ADC1
20x20x
S&H
ADC
16x
GND
Active filter with
gain
Current input
GPIO
Xplained Pro Analog Module (XAM)
The XAM consists of:
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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
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:
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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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3.2.3.
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
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
range
Hardware
Resolution Accuracy
Comments
Range 1
Low current shunt and
high gain stage
20nA
1 LSB ±1% Below 1μA the error will
increase. Typical error for
300nA is 1 LSB ± 10%
Range 2
Low current shunt and
low gain stage
150nA
1 LSB ±1%
Range 3
High current shunt and
high gain stage
10μA
1 LSB ±1%
Range 4
High current shunt and
low gain stage
100μA
1 LSB ±1% Above 100mA the error will
increase to 1 LSB ±5% at
400mA. Maximum current is
400mA
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.
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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3.4.
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
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
board itself.
Recommended
maximum is 2A due to
the input protection
maximum current
specification.
PWR
Embedded debugger
USB
4.4V to 5.25V (according 500mA (according to
to USB spec.)
USB spec.)
DEBUG USB
Target USB
4.4V to 5.25V (according 500mA (according to
to USB spec.)
USB spec.)
TARGET USB
The kit will automatically detect which power sources are available and choose which one to use
according to the following priority:
1.
2.
3.
External power.
Embedded Debugger USB.
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/
GPIO
Slave select for SPI and/or general purpose I/O
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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3.5.3.
Description
Function
Pin
Pin
Function
Description
Segment 36 /
QTouch X-line 0
SEG36 / QT_X0
41
42
SEG37 / QT_Y0
Segment 37 /
QTouch Y-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
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)
4
VCC_P3V3
Regulated 3.3V (output, used as main power supply for the kit)
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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
External 5V
input
Regulator 3.3V
EDBG & XAM
Auto mux disable
EDBG USB
VCC_P3V3
Auto mux with
current limit
Regulator 3.3V
Power
Measurement
Select
VCC_MCU
Jumper
VBAT
SAML22N18
Select
Target USB
Power converter
Supercap
Power consumer
Power source
Peripherals
Power switch
VCC_TARGET
Related Links
Power Sources 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.
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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
pin
Shared functionality
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
pin
Shared functionality
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
pin
Shared functionality
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
pin
Shared functionality
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
GPIO
SLCD
10 [SPI_SS_B/GPIO] PB19
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4.2.2.
EXT3 pin
SAM L22 Function
pin
Shared functionality
11 [TWI_SDA]
PB30
SERCOM5 PAD[0] I²C SDA
EXT1, EXT2, Shield, Crypto, and
EDBG I²C
12 [TWI_SCL]
PB31
SERCOM5 PAD[1] I²C SCL
EXT1, EXT2, Shield, Crypto, and
EDBG I²C
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
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.
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/
QT_X2 ]
PB07
PTC/XY[13]
38 [SEG33/
QT_Y2]
PB04
PTC/XY[10]
EDBG GPIO0, EXT2, and XAM
39 [SEG34/
QT_X1]
PB06
PTC/XY[12]
QTBTN1
40 [SEG35/
QT_Y1]
PB05
PTC/XY[11]
EDBG GPIO1, EXT2, and XAM
41 [SEG36/
QT_X0]
PC28
PTC/XY[20]
EXT2
42 [SEG37/
QT_Y0]
PA27
PTC/XY[21]
EXT2
43 [COM4]
PC07
SLCD/ LP[10]
Shield
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4.2.3.
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
V-]
-
GND
49 [Backlight
CTRL]
PC27
TC3/WO[1]
50 [ID]
-
Xplained Pro ID Communication line to ID chip on extension board
51 [GND]
-
GND
User LED0
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
pin
Arduino pin name
Function
Shared functionality
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
pin
Arduino pin name
Function
Shared functionality
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
pin
Arduino pin name
Function
Shared functionality
1
PB13
D0 / RX0
SERCOM3 PAD[1]
UART RX
SLCD
2
PB12
D1 / TX0
SERCOM3 PAD[0]
UART TX
SLCD
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
pin
Arduino pin name
Function
Shared functionality
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
MOSI
SLCD and Shield
5
PC11
D12 / SPI-MISO
SERCOM1 PAD[3] SPI
MISO
SLCD and Shield
6
PC13
D13 / SPI-SCK
SERCOM1 PAD[1] SPI
SCK
SLCD and Shield
7
-
GND
-
-
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J901 pin
SAM L22
pin
Arduino pin name
Function
Shared functionality
8
PA03
AREF
ADC / DAC VREFA
EXT1
9
PB30
SDA
SERCOM5 PAD[0] I²C
SDA
EXT1, EXT2, EXT3,
Crypto, and EDBG I²C
10
PB31
SCL
SERCOM5 PAD[1] I²C
SCL
EXT1, EXT2, EXT3,
Crypto, and EDBG I²C
Table 4-9. J900 - SPI
4.2.4.
J900 pin
SAM L22
pin
Arduino pin name
Function
Shared functionality
1
PC11
MISO
SERCOM1 PAD[3] SPI
MISO
SLCD and Shield
2
-
5V
VCC_P5V0
-
3
PC13
SCK
SERCOM1 PAD[1] SPI
SCK
SLCD and Shield
4
PC12
MOSI
SERCOM1 PAD[0] SPI
MOSI
SLCD and Shield
5
RESETN
RESET
TARGET_RESET
Shield, EDBG, and
Cortex Debug
6
-
GND
GND
-
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
4.2.5.
SAM L22 pin
USB function
PC26
VBUS Detection
PA24
USB D-
PA25
USB D+
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
Pin / Net
Function
Shared functionality
1
VCC_TARGET_P3V3
ATSAML22N18A voltage
2
PA31
SWD data signal
EDBG SWD
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4.2.6.
Cortex Debug
Connector pin
Pin / Net
Function
Shared functionality
3
GND
Ground
4
PA30
SWD clock signal
5
GND
Ground
6
-
-
7
-
-
8
-
-
9
GND
Ground
10
RESETN
Target reset signal
EDBG SWD
Shield, Shield2, and
EDBG
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.
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
4.3.2.
SAM L22 pin
Function
PA00
XIN32
PA01
XOUT32
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
4.3.3.
SAM L22 pin
Silkscreen text
RESET
RESET
PC01
SW0
Shared functionality
EXT2, Shield, and EDBG GPIO3
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
4.3.4.
SAM L22 pin
Function
Shared functionality
PC27
Yellow LED0
SLCD
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
4.3.5.
SAM L22 pin
Silkscreen text
Shared functionality
PB06
QT BTN1
SLCD
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
4.3.6.
VBAT SELECT pin
Function
1
Power from super capacitor (47mF)
2
PB03/VBAT pin on SAM L22
3
Power from board supply
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
4.3.7.
ATECC508A
pin
SAM L22 pin
Function
Shared functionality
1 [NC]
-
-
-
2 [NC]
-
-
-
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
-
9 [PAD]
-
GND
-
-
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.
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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4.4.
SAM L22 pin
Tamper name
Shared functionality
PB00
IN[0]
EXT1 pin 16
PB01
OUT
EXT1 pin 18
PB02
IN[1]
EXT1 pin 17
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
4.4.2.
SAM L22 pin
Function
Shared functionality
PA30
SWD clock
Cortex Debug
PA31
SWD data
Cortex Debug
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
4.4.3.
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)
-
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
4.4.4.
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
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
Target MCU
Current measurement
bypass jumper selection
Xplained Pro Analog
Module (XAM)
Target
Regulator
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
Designat Value
or
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
R307
0R
U302 SCL
PB31 I2C SCL
Allows complete or partial
disconnect of U302, ATECC508A
from ATSAML22N18A
R400
39R
EDBG TARGET
RESET
TARGET MCU
RESET
R404
0R
EDBG SWCLK
PA30 SWCLK
R405
0R
EDBG SWDIO
PA31 SWDIO
R601
0R
XAM ADC_SYNC1
PB04 GPIO
R600
0R
XAM ADC_SYNC2
PB05 GPIO
R406
0R
EDBG CDC RX
PC24 UART TX
R407
0R
EDBG I2C SDA
PB30 I2C SDA
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
SENSE
TARGET_MCU_RES Reset sense signal to EDBG,
ET
used to detect external resets
R900
0R
TARGET MCU
RESET
RESET UNO
Debug interface from the EDBG
to the ATSAML22N18A
XAM ADC sync interfaces to the
ATSAML22N18A.
EDBG CDC and DGI interfaces
to the ATSAML22N18A
ATSAML22N18A reset signal to
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
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5.
5.1.
Appendix
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.
2.
3.
4.
5.
6.
Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the
project.
In the category General Options, select the Target tab. Select the device for the project or, if not
listed, the core of the device.
In the category Debugger, select the Setup tab. Select CMSIS DAP as the driver.
In the category Debugger, select the Download tab. Check the check box for Use flash loader(s)
option.
In the category Debugger > CMSIS DAP, select the Setup tab. Select System (default) as the
reset method.
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) (1)
7 (Not used)
8 (Not used)
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
Atmel SAM L22 Xplained Pro [USER GUIDE]
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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
6.3.2.
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])
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
6.3.3.
ATAES132A
pin
SAM L22 pin
Function
Shared functionality
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
-
-
-
Assembly Drawings
Assembly drawings for kit modifications on revision 2 of SAM L22 Xplained Pro.
Atmel SAM L22 Xplained Pro [USER GUIDE]
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Figure 6-1. Revision 2 Assembly Drawing Top
Atmel SAM L22 Xplained Pro [USER GUIDE]
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Figure 6-2. Revision 2 Assembly Drawing Bottom
Atmel SAM L22 Xplained Pro [USER GUIDE]
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43
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
Atmel SAM L22 Xplained Pro [USER GUIDE]
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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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intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND
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