Atmel-42405-SAML21-Xplained-Pro User

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Atmel-42405-SAML21-Xplained-Pro User | Manualzz

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.

Atmel-42405C-SAM-L21-Xplained-Pro_User Guide-03/2016

Table of Contents

Preface............................................................................................................................ 1

1. Introduction................................................................................................................ 4

1.1.

Features....................................................................................................................................... 4

1.2.

Kit Overview................................................................................................................................. 4

2. Getting Started...........................................................................................................6

2.1.

Xplained Pro Quick Start.............................................................................................................. 6

2.2.

Design Documentation and Relevant Links................................................................................. 6

3. Xplained Pro.............................................................................................................. 8

3.1.

Embedded Debugger................................................................................................................... 8

3.2.

Xplained Pro Analog Module (XAM).............................................................................................9

3.2.1.

Overview........................................................................................................................9

3.2.2.

EDBG Interface..............................................................................................................9

3.2.3.

Sample Rate................................................................................................................ 10

3.2.4.

Measurement Ranges and Accuracy...........................................................................10

3.3.

Hardware Identification System..................................................................................................10

3.4.

Power Sources........................................................................................................................... 11

3.5.

Xplained Pro Headers and Connectors......................................................................................12

3.5.1.

Xplained Pro Standard Extension Header................................................................... 12

3.5.2.

Xplained Pro Power Header........................................................................................ 13

4. Hardware User Guide.............................................................................................. 14

4.1.

Connectors................................................................................................................................. 14

4.1.1.

Xplained Pro Extension Headers.................................................................................15

4.1.2.

VDDIO Header.............................................................................................................17

4.1.3.

USB............................................................................................................................. 17

4.1.4.

Current Measurement Header..................................................................................... 18

4.1.5.

Cortex Debug Connector............................................................................................. 18

4.2.

Peripherals................................................................................................................................. 18

4.2.1.

Crystals........................................................................................................................18

4.2.2.

Mechanical Buttons..................................................................................................... 19

4.2.3.

LED..............................................................................................................................19

4.2.4.

QTouch Button............................................................................................................. 19

4.2.5.

Backup Battery............................................................................................................ 19

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.....................................................................................20

4.4.

SAM L21 Xplained Pro XAM Configuration................................................................................21

5. Appendix..................................................................................................................23

5.1.

Getting Started with IAR.............................................................................................................23

5.2.

Connecting a SAM-ICE to an Xplained Pro Board..................................................................... 26

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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...................................................................................................................................28

7. Document Revision History..................................................................................... 30

8. Evaluation Board/Kit Important Notice.....................................................................31

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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

SW0

EXT2

EXT2

,

,

Ground

EXT3

EXT3

, and

, and

EDBG I²C

EDBG I²C

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

Onboard QTouch Button 1

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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

EDBG GPIO2

EDBG GPIO3

EXT1 ,

EXT3 , and

EDBG I²C

EXT1 ,

EXT3 , and

EDBG I²C

EXT3 UART

EXT3 UART

EXT3 and

EDBG SPI

EXT3 and

EDBG SPI

EXT3 and

EDBG SPI

Ground

Power for extension board

Shared functionality

Communication line to the ID chip on an extension board

Ground

EDBG GPIO0

LED0

EDBG GPIO1

EXT1 , EXT2 , and

EDBG I²C

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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

EXT1 , EXT2

EXT2 UART

EXT2 UART

, and

EDBG I²C

EXT2 and

EDBG SPI

EXT2 and

EDBG SPI

EXT2 and

EDBG SPI

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

Crystal footprint

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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

EDBG SWD

EDBG SWD

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

USB VBUS

EXT3

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

EXT1

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

EXT3

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

EXT2

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

Embedded Debugger

.

Table 4-13. SWD Connections

SAM L21 pin

PA30

PA31

Function

SWD clock

SWD data

Shared functionality

Cortex debug connector

Cortex debug connector

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

Embedded Debugger

.

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

EXT2 and

EXT3

SERCOM5 PAD[2] SPI MOSI (Master

Out, Slave in)

EXT2 and

EXT3

SERCOM5 PAD[3] SPI SCK (Clock Out)

EXT2 and

EXT3

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

EXT1 , EXT2 , and

EXT3

EXT1 , EXT2 , and

EXT3

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

EXT3

EXT3

EXT2

EXT2

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

tab. Select

CMSIS DAP

as the driver.

4.

In the category

Debugger

, select the

Download

tab. Check the check box for

Use flash loader(s)

option.

5.

In the category

Debugger

>

CMSIS DAP

, select the

Setup

tab.

Select

System (default)

as the reset method.

6.

In the category

Debugger

>

CMSIS DAP

, select the

JTAG/SWD

tab.

Select

SWD

as the interface and optionally select the

SWD speed

.

Figure 5-1. Select Target Device

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Figure 5-2. Select Debugger

Figure 5-3. Configure Flash Loader

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Figure 5-4. Configure Reset

Figure 5-5. Configure Interface

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5.2. Connecting a SAM-ICE to an Xplained Pro Board

Xplained Pro kits featuring a 10-pin 50mil debug connector can use external debug tools like SAM-ICE

™ or Atmel-ICE instead of the built-in EDBG. Devices using SWD interface on-board will have a connector with the pinout compatible with the Cortex Debug Connector .

You can connect the SAM-ICE to the debug connector on an Xplained Pro using either an Atmel-ICE adapter, SAM-ICE adapter, or a 10-pin 50-mil header to squid cable. When using a squid cable, see the table and figures below for how to connect the SAM-ICE to the Xplained Pro board.

Table 5-1. Squid Cable Connections

Squid Cable pin

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)

(1)

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,

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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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