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SMART ARM-based Microcontrollers
SAM L21 Xplained Pro
USER GUIDE
Preface
The Atmel
®
SAM L21 Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAML21J18B microcontroller.
Supported by the Atmel Studio integrated development platform, the kit provides easy access to the features of the Atmel ATSAML21J18B 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 ATSAML21J18B.
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
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1. Introduction
1.1. Features
• ATSAML21J18B microcontroller
• One mechanical reset button
• One mechanical programmable button
• One QTouch
®
button
• One yellow user LED
• Backup battery
• 32.768kHz crystal
• USB interface, device and reduced host mode
• 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 icluding scope information
– Programming and debugging, including power measurements
– Data Gateway Interface: SPI, I
2
C, 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 L21 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel
ATSAML21J18B.
The kit offers a set of features that enables the ATSAML21J18B 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 L21 Xplained Pro Evaluation Kit Overview
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2. Getting Started
2.1. Xplained Pro Quick Start
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, Windows 8, Windows 10, and Windows Server 2012.
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 L21 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 L21 Xplained
Pro.
•
Xplained products
- Atmel Xplained evaluation kits are a series of easy-to-use evaluation kits for
Atmel microcontrollers and other Atmel products. For low pin-count devices the Xplained Nano series provides a minimalistic solution with access to all I/O pins of the target microcontroller.
Xplained Mini kits are for medium pin-count devices and adds Arduino Uno compatible header footprint and a prototyping area. Xplained Pro kits are for medium to high pin-count devices, they features advanced debugging and standardized extensions for peripheral functions. All these kits have on board programmers/debuggers which creates a set of low-cost boards for evaluation and demonstration of features and capabilities of different Atmel products.
•
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.
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•
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.
•
SAM L21 Xplained Pro on the Atmel website
- Atmel website link.
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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 L21 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 ATSAML21J18B.
On SAM L21 Xplained Pro, the SWD interface is connected between the EDBG and the ATSAML21J18B.
The Virtual COM Port is connected to a UART on the ATSAML21J18B 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 ATSAML21J18B must match the settings given in the terminal software.
Info:
The virtual COM port in the EDBG requires the terminal software to set the data terminal ready (DTR) signal to enable the UART pins connected to the ATSAML21J18B. If the DTR signal is not enabled the UART pins on the EDBG is kept in high-z (tristate) rendering the COM port unusable. The DTR signal is set automatically by some terminal software, but it may have to be manually enabled in your terminal.
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
ATSAML21J18B 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 L21 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
Normal operation
Bootloader mode (idle)
Bootloader mode (firmware upgrade)
Power LED
Power LED is lit when power is applied to the board.
Status LED
Activity indicator, LED flashes when any communication happens to the EDBG.
The power LED and the status LED blinks simultaneously.
The power LED and the status LED blinks in an alternating pattern.
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For further documentation on the EDBG, see the EDBG User Guide .
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.
Control MCU
Calibration circuitry
Calibration ON/OFF
GPIO(s)
GPIO
Sync GPIO
I2C
SPI
Clock sync
SWD
EDBG
Pre-amplifier
20x
20x
2x
voltage reference
2.7V
AREF
ADC0
ADC1
16x
Active filter with gain
GND
GPIO
S&H
ADC
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
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:
• I
2
C: This is used to control and configure the XAM
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• 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
• 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.
Hardware Resolution Accuracy Comments Measurement range
Range 1
Range 2
Low current shunt and high gain stage
20nA
150nA
1 LSB ±1% Below 1μA the error will
1 LSB ±1% increase. Typical error for
300nA is 1 LSB ± 10%
Range 3
Range 4
Low current shunt and low gain stage
High current shunt and high gain stage
High current shunt and low gain stage
10μA
100μA
1 LSB ±1%
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.
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Table 3-2. Xplained Pro ID Chip Content
Data field
Manufacturer
Product Name
Product Revision
Product Serial Number
Minimum Voltage [mV]
Maximum Voltage [mV]
Maximum Current [mA]
Data type
ASCII string
ASCII string
ASCII string
ASCII string uint16_t uint16_t uint16_t
Example content
Atmel'\0'
Segment LCD1 Xplained Pro'\0'
02'\0'
1774020200000010’\0’
3000
3600
30
3.4. Power Sources
The SAM L21 Xplained Pro kit can be powered by several power sources as listed in the table below.
Table 3-3. Power Sources for SAM L21 Xplained Pro
Power input
External power
Embedded debugger
USB
Voltage requirements Current requirements Connector marking
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.
4.4V to 5.25V (according to USB spec.)
500mA (according to
USB spec.)
PWR
DEBUG 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.
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
2
3
Pin number
1
4
5
6
7
8
9
10
Name
ID
GND
ADC(+)
ADC(-)
GPIO1
GPIO2
PWM(+)
PWM(-)
Description
Communication line to the ID chip on an extension board
Ground
Analog to digital converter, alternatively positive part of differential
ADC
Analog to digital converter, alternatively negative part of differential
ADC
General purpose I/O
General purpose I/O
Pulse width modulation, alternatively positive part of differential
PWM
Pulse width modulation, alternatively negative part of differential
PWM
Interrupt request line and/or general purpose I/O
Slave select for SPI and/or general purpose I/O
11
12
13
14
15
16
17
18
19
20
IRQ/GPIO
SPI_SS_B/
GPIO
I
2
C_SDA
I
2
C_SCL
UART_RX
UART_TX
SPI_SS_A
SPI_MOSI
SPI_MISO
SPI_SCK
GND
VCC
Data line for I
2
Clock line for I
2
C interface. Always implemented, bus type.
C interface. Always implemented, bus type.
Receiver line of target device UART
Transmitter line of target device UART
Slave select for SPI. Should preferably be unique.
Master out slave in line of serial peripheral interface. Always implemented, bus type.
Master in slave out line of serial peripheral interface. Always implemented, bus type.
Clock for serial peripheral interface. Always implemented, bus type.
Ground
Power for extension board
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3.5.2. Xplained Pro Power Header
The power header can be used to connect external power to the SAM L21 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 3-5. Xplained Pro Power Header
Pin number
3
4
1
2
Pin name
VEXT_P5V0
GND
VCC_P5V0
VCC_P3V3
Description
External 5V input
Ground
Unregulated 5V (output, derived from one of the input sources)
Regulated 3.3V (output, used as main power supply for the kit)
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4. Hardware User Guide
4.1. Connectors
The following sections describes the implementation of the relevant connectors and headers on SAM L21
Xplained Pro and their connection to the ATSAML21J18B. The tables of connections in the sections also
describes which signals are shared between the headers and on-board functionality. Figure 4-1 SAM
L21 Xplained Pro Connector Overview shows all available connectors and jumpers on SAM L21 Xplained
Pro.
Figure 4-1. SAM L21 Xplained Pro Connector Overview
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4.1.1. Xplained Pro Extension Headers
The SAM L21 Xplained Pro headers EXT1, EXT2, and EXT3 offers 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 Table 3-4 Xplained Pro Standard Extension
Header . The headers have a pitch of 2.54mm.
Table 4-1. Extension Header EXT1
EXT1 pin Function Shared functionality
1 [ID] -
SAM L21 pin
Communication line to the ID chip on an extension board
Ground 2 [GND]
3 [ADC(+)]
4 [ADC(-)]
5 [GPIO1]
6 [GPIO2]
7 [PWM(+)]
8 [PWM(-)]
9 [IRQ/GPIO] PB04
10 [SPI_SS_B/GPIO] PA02
11 [TWI_SDA]
12 [TWI_SCL]
PA08
PA09
13 [USART_RX]
14 [USART_TX]
15 [SPI_SS_A]
16 [SPI_MOSI]
PB09
PB08
PA05
PA06
17 [SPI_MISO]
18 [SPI_SCK]
19 [GND]
20 [VCC]
-
PB05
PA03
PB06
PB07
PA12
PA13
-
-
PA04
PA07
-
AIN[13]
AIN[1]
GPIO
GPIO
TCC2/WO[0]
TCC2/WO[1]
IRQ4/GPIO
GPIO
SERCOM2 PAD[0] I²C SDA
SERCOM2 PAD[1] I²C SCL
SERCOM4 PAD[1] UART RX
SERCOM4 PAD[0] UART TX
SERCOM0 PAD[1] SPI SS
SERCOM0 PAD[2] SPI MOSI
-
-
SERCOM0 PAD[0] SPI MISO
SERCOM0 PAD[3] SPI SCK
Ground
Power for extension board
Table 4-2. Extension Header EXT2
EXT2 pin
1 [ID] -
SAM L21 pin
-
Function Shared functionality
2 [GND]
3 [ADC(+)]
-
PA10
-
AIN[18] / PTC_Y8
Communication line to the ID chip on an extension board
Ground
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EXT2 pin
4 [ADC(-)]
5 [GPIO1]
6 [GPIO2]
7 [PWM(+)]
8 [PWM(-)]
9 [IRQ/GPIO]
10 [SPI_SS_B/GPIO] PB15
11 [TWI_SDA] PA08
12 [TWI_SCL]
13 [USART_RX]
PA09
PA19
14 [USART_TX]
15 [SPI_SS_A]
16 [SPI_MOSI]
17 [SPI_MISO]
PA18
PA17
PB22
PB16
18 [SPI_SCK]
19 [GND]
20 [VCC]
SAM L21 pin
PA11
PA20
PA21
PB12
PB13
PB14
-
-
PB23
Function
AIN[19]
GPIO
GPIO
TC4/WO[0]
TC4/WO[1]
IRQ14/GPIO
GPIO
SERCOM2 PAD[0] I²C SDA
SERCOM2 PAD[1] I²C SCL
SERCOM1 PAD[3] UART RX
SERCOM1 PAD[2] UART TX
GPIO
SERCOM5 PAD[2] SPI MOSI
SERCOM5 PAD[0] SPI MISO
-
-
SERCOM5 PAD[3] SPI SCK
Table 4-3. Extension Header EXT3
EXT3 pin
1 [ID] -
SAM L21 pin
-
Function
2 [GND]
3 [ADC(+)]
4 [ADC(-)]
5 [GPIO1]
6 [GPIO2]
7 [PWM(+)]
8 [PWM(-)]
PB10
PB11
9 [IRQ/GPIO] PA16
10 [SPI_SS_B/GPIO] PA27
11 [TWI_SDA] PA08
-
PB00
PB01
PB30
PA15
-
AIN[8]
AIN[9]
GPIO
GPIO
TCC0/WO[4]
TCC0/WO[5]
IRQ0/GPIO
GPIO
SERCOM2 PAD[0] I²C SDA
Shared functionality
Ground
Power for extension board
Shared functionality
Communication line to the ID chip on an extension board
Ground
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EXT3 pin
12 [TWI_SCL]
13 [USART_RX]
14 [USART_TX]
15 [SPI_SS_A]
16 [SPI_MOSI]
17 [SPI_MISO]
18 [SPI_SCK]
19 [GND]
20 [VCC]
SAM L21 pin
PA09
PA19
PA18
PB17
PB22
PB16
-
-
PB23
-
-
Function
SERCOM2 PAD[1] I²C SCL
SERCOM1 PAD[3] UART RX
SERCOM1 PAD[2] UART TX
SERCOM5 PAD[1] SPI SS
SERCOM5 PAD[2] SPI MOSI
SERCOM5 PAD[0] SPI MISO
SERCOM5 PAD[3] SPI SCK
Shared functionality
Ground
Power for extension board
4.1.2. VDDIO Header
The SAM L21 Xplained Pro has a 2-pin header connecting the power supply from the VCC_MCU net to
VCC_IO net through a jumper. This header can be used to measure the current to the I/O block of the
SAM L21 device by removing the jumper and connect an ammeter. SAM L21 has the possibility to run the
I/O block at a lower voltage level than the MCU is running and thus support interfacing devices that require lower operating voltages. The header can then be used to power the VCC_IO pin at a different voltage level by removing the jumper and connecting a power supply with the desired voltage. Refer to the datasheet of the device for valid operating voltages.
Table 4-4. VDDIO Header
VDDIO header pin
1
2
Function
VCC_MCU power supply
VCC_IO power input
4.1.3. USB
The SAM L21 Xplained Pro has a Micro-USB connector for use with the SAM L21 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. In USB host mode VBUS voltage is provided by the kit and can thus not identify a connected device, so another GPIO is used to detect the
USB ID of the device.
Table 4-5. USB Connections
SAM L21 pin
PA14
PB02
PA24
PA25
USB function
VBUS Detection
USB ID
USB D-
USB D+
-
-
-
Shared functionality
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4.1.4. Current Measurement Header
An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of the SAM L21 Xplained Pro. All power to the ATSAML21J18B 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
ATSAML21J18B to be powered through its I/O pins. This may cause permanent damage to the device.
4.1.5. Cortex Debug Connector
SAM L21 Xplained Pro has a 10-pin 50-mil Cortex
®
Debug Connector that can be used to attach external debuggers to the ATSAML21J18B.
Table 4-6. Cortex Debug Connector
Pin / Net Function Shared functionality
8
9
10
6
7
4
5
1
2
Cortex Debug
Connector pin
3
-
-
-
VCC_TARGET_P3V3
PA31
GND
PA30
GND
GND
RESETN
ATSAML21J18B voltage
SWD data signal
Ground
-
-
SWD clock signal
Ground
-
Ground
Target reset signal
4.2. Peripherals
4.2.1. Crystals
The SAM L21 Xplained Pro kit contains one mounted 32.768kHz crystal and a footprint for higher frequency crystals that can be used as clock sources for the SAM L21. The crystals have cut-straps next to them that can be used to measure the oscillator safety factor. This is done by cutting the strap and adding a resistor across the strap. Information about oscillator allowance and safety factor can be found in application note AVR41001 , information about clock calibration and compensation can be found in application note AT03155 .
The footprint for the external crystal is based on the Fox FQ5032B series.
Info:
Note that PA14 and PA15 are shared with USB VBUS detect and EXT3 pin 5. To disconnect PA14 and PA15 from all functionality except XTAL cut J300 and J302.
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Table 4-7. External 32.768kHz Crystal
SAM L21 pin
PA00
PA01
Function
XIN32
XOUT32
Table 4-8. External Crystal Footprint
SAM L21 pin
PA14
PA15
Function
XIN
XOUT
-
-
Shared functionality
Shared functionality
4.2.2. Mechanical Buttons
SAM L21 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the SAM L21 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.
Note:
There is no pull-up resistor connected to the generic user button. Remember to enable the internal pull-up in the SAM L21 to use the button.
Table 4-9. Mechanical Buttons
SAM L21 pin
RESET
PA02
Silkscreen text
RESET
SW0
-
Shared functionality
4.2.3. LED
There is one yellow LED available on the SAM L21 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 4-10. LED Connection
SAM L21 pin
PB10
Function
Yellow LED0
Shared functionality
4.2.4. QTouch Button
There is one self capacitance button available on the SAM L21 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. A zero ohm resistor is added on the board to easily disconnect the onboard touch buttons from the extension header, as the I/O lines are shared between the two.
Note:
To get started with QTouch refer to Atmel QTouch
®
Library and Atmel QTouch
®
Composer .
Table 4-11. QTouch Connection
SAM L21 pin
PA10
Silkscreen text
QT BTN1
Shared functionality
4.2.5. Backup Battery
The SAM L21 Xplained Pro has a backup battery for use with the SAM L21 backup module. The battery can be connected to the device by placing a jumper over pin 1-2 on the 3-pin VBAT SELECT header.
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By default the jumper is placed over pin 2-3 to select the board power supply. This configuration is selected to avoid draining the battery and can be used during development.
Table 4-12. VBAT SELECT Header
VBAT SELECT pin
1
2
3
Function
Power from battery
PB03/VBAT pin on SAM L21
Power from board supply
4.3. Embedded Debugger Implementation
SAM L21 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the ATSAML21J18B 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 TWI and it includes four of the SAM L21 GPIOs. Atmel Studio can be used as a front end for the Embedded
Debugger.
4.3.1. 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
.
Table 4-13. SWD Connections
SAM L21 pin
PA30
PA31
Function
SWD clock
SWD data
Shared functionality
4.3.2. Virtual COM Port
The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAML21J18B
UARTs. For further information on how to use the Virtual COM port, see
.
Table 4-14. Virtual COM Port Connections
SAM L21 pin
PA22
PA23
Function
SERCOM3 PAD[0] UART TXD (SAM
L21 TX line)
SERCOM3 PAD[1] UART RXD (SAM
L21 RX line)
-
-
Shared functionality
4.3.3. 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 ATSAML21J18B 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 4-15. DGI Interface Connections When Using SPI
SAM L21 pin
PB31
PB16
PB22
PB23
Function
GPIO/SPI SS (Slave select) (SAM L21 is Master)
SERCOM5 PAD[0] SPI MISO (Master
In, Slave Out)
-
Shared functionality
SERCOM5 PAD[2] SPI MOSI (Master
Out, Slave in)
SERCOM5 PAD[3] SPI SCK (Clock Out)
Table 4-16. DGI Interface Connections When Using I²C
SAM L21 pin
PA08
PA09
Function
SERCOM2 PAD[0] SDA (Data line)
SERCOM2 PAD[1] SCL (Clock line)
Shared functionality
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 L21 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 4-17. GPIO Lines Connected to the EDBG
SAM L21 pin
PB01
PA16
PA20
PA21
Function
GPIO0
GPIO1
GPIO2
GPIO3
Shared functionality
4.4. SAM L21 Xplained Pro XAM Configuration
On the SAM L21 Xplained Pro the MCU and the MCU peripherals (e.g. extensions) are powered by its own regulator as show in
Figure 4-2 SAM L21 Xplained Pro XAM Implementation Block Diagram
. 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 4-2. SAM L21 Xplained Pro XAM Implementation Block Diagram
Target
Peripherals
Xplained Pro MCU power measurement jumper
Target MCU
Current measurement bypass jumper selection
Xplained Pro Analog
Module (XAM)
Target
Regulator
On the SAM L21 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 for "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.
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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
4.
In the category
Debugger
, select the
Download
5.
In the category
Debugger
>
CMSIS DAP
, select the
Setup
tab.
6.
In the category
Debugger
>
CMSIS DAP
, select the
JTAG/SWD
tab.
as the interface and optionally select the
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
1 (VCC)
2 (SWDIO/TMS)
3 (GND)
4 (SWCLK/TCK)
5 (GND)
6 (SWO/TDO)
7 (Not used)
8 (Not used)
9 (Not used)
10 (RESET)
SAM-ICE pin
1 (VTref)
7 (TMS)
4 (GND)
9 (TCK)
6 (GND)
13 (TDO)
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 L21 Xplained Pro is A09-2241.
6.2. Revision 5
The device on revision 5 of the kit has been changed from ATSAML21J18B-AUTES to ATSAML21J18B-
AUT revision C or newer.
6.3. Revision 4
The device on revision 4 of the kit has been changed from ATSAML21J18A-AUTES to ATSAML21J18B-
AUTES.
The top level order code of the SAM L21 Xplained Pro evaluation kit changed to ATSAML21-XPRO-B for revision 4 and newer. Revision 3 and earlier
6.4. Revision 3
Revision 3 and previous revisions use ATSAML21J18A-AUTES as the main device, revision 3 is the initially released revision.
The top level order code of the SAM L21 Xplained Pro evaluation kit is ATSAML21-XPRO for revision 3.
The extra crystal footprint connected to PA14 and PA15 described in
Crystals is not present on this
revision.
The overview picture in
Figure 1-1 SAM L21 Xplained Pro Evaluation Kit Overview
is not applicable for revision 3, see the figure below instead.
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Figure 6-1. SAM L21 Xplained Pro Evaluation Kit Overview
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7. Document Revision History
Doc. rev.
42405C
42405B
42405A
Date
03/2016
07/2015
02/2015
Comment
Updated for revision 5 of the kit.
Updated for revision 4 of the kit.
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
©
2016 Atmel Corporation. / Rev.: Atmel-42405C-SAM-L21-Xplained-Pro_User Guide-03/2016
Atmel
®
, Atmel logo and combinations thereof, Enabling Unlimited Possibilities
Corporation in U.S. and other countries. Microsoft
®
, Windows
®
®
, AVR
, and Windows Vista
®
, QTouch
®
, and others are registered trademarks or trademarks of Atmel
®
are registered trademarks of Microsoft Corporation in U.S. and or other countries. ARM
®
, ARM Connected
®
logo and others are the registered trademarks or trademarks of ARM Ltd. Other terms and product names may be trademarks of others.
DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any 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
CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED
OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS
INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
SAFETY-CRITICAL, MILITARY, AND AUTOMOTIVE APPLICATIONS DISCLAIMER: Atmel products are not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death (“Safety-Critical Applications”) without an Atmel officer's specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems, equipment or systems for the operation of nuclear facilities and weapons systems. Atmel products are not designed nor intended for use in military or aerospace applications or environments unless specifically designated by Atmel as military-grade. Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive-grade.
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Table of contents
- 1 Preface
- 2 Table of Contents
- 4 1. Introduction
- 4 1.1. Features
- 4 1.2. Kit Overview
- 6 2. Getting Started
- 6 2.1. Xplained Pro Quick Start
- 6 2.2. Design Documentation and Relevant Links
- 8 3. Xplained Pro
- 8 3.1. Embedded Debugger
- 9 3.2. Xplained Pro Analog Module (XAM)
- 9 3.2.1. Overview
- 9 3.2.2. EDBG Interface
- 10 3.2.3. Sample Rate
- 10 3.2.4. Measurement Ranges and Accuracy
- 10 3.3. Hardware Identification System
- 11 3.4. Power Sources
- 12 3.5. Xplained Pro Headers and Connectors
- 12 3.5.1. Xplained Pro Standard Extension Header
- 13 3.5.2. Xplained Pro Power Header
- 14 4. Hardware User Guide
- 14 4.1. Connectors
- 15 4.1.1. Xplained Pro Extension Headers
- 17 4.1.2. VDDIO Header
- 17 4.1.3. USB
- 18 4.1.4. Current Measurement Header
- 18 4.1.5. Cortex Debug Connector
- 18 4.2. Peripherals
- 18 4.2.1. Crystals
- 19 4.2.2. Mechanical Buttons
- 19 4.2.3. LED
- 19 4.2.4. QTouch Button
- 19 4.2.5. Backup Battery
- 20 4.3. Embedded Debugger Implementation
- 20 4.3.1. Serial Wire Debug
- 20 4.3.2. Virtual COM Port
- 20 4.3.3. Atmel Data Gateway Interface
- 21 4.4. SAM L21 Xplained Pro XAM Configuration
- 23 5. Appendix
- 23 5.1. Getting Started with IAR
- 26 5.2. Connecting a SAM-ICE to an Xplained Pro Board
- 28 6. Hardware Revision History and Known Issues
- 28 6.1. Identifying Product ID and Revision
- 28 6.2. Revision 5
- 28 6.3. Revision 4
- 28 6.4. Revision 3
- 30 7. Document Revision History
- 31 8. Evaluation Board/Kit Important Notice