Microchip Technology SAMC21N Xplained Pro Manuale utente

SAMC21N Xplained Pro

Preface

The SAMC21N Xplained Pro evaluation kit is a hardware platform to evaluate ATSAMC21N18A

microcontroller.

Supported by the Atmel Studio integrated development platform, the kit provides easy access to the

features of the ATSAMC21N18A 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 ATSAMC21N18A.

The Xplained Pro extension series evaluation kits offers additional peripherals to extend the features of

the board and ease the development of custom designs.

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. Hardware Identification System....................................................................................................9

3.3. Power Sources............................................................................................................................. 9

3.4. Xplained Pro Headers and Connectors......................................................................................10

4. Hardware Users Guide............................................................................................ 12

4.1. Power Distribution...................................................................................................................... 12

4.2. Connectors.................................................................................................................................12

4.3. Peripherals................................................................................................................................. 20

4.4. Kit Modifications......................................................................................................................... 23

4.5. Embedded Debugger Implementation........................................................................................28

5. Appendix..................................................................................................................31

5.1. Getting Started with IAR.............................................................................................................31

5.2. Connecting a SAM-ICE to an Xplained Pro Board..................................................................... 34

6. Hardware Revision History and Known Issues........................................................36

6.1. Identifying Product ID and Revision........................................................................................... 36

6.2. Revision......................................................................................................................................36

7. Document Revision History..................................................................................... 37

The Microchip Web Site................................................................................................ 38

Customer Change Notification Service..........................................................................38

Customer Support......................................................................................................... 38

Microchip Devices Code Protection Feature................................................................. 38

Legal Notice...................................................................................................................39

Trademarks................................................................................................................... 39

Quality Management System Certified by DNV.............................................................40

SAMC21N Xplained Pro

Worldwide Sales and Service........................................................................................41

SAMC21N Xplained Pro

1. Introduction

1.1 Features

• ATSAMC21N18A microcontroller

• Embedded Debugger

– USB interface

– 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 of on-board SAMC21N through Serial Wire Debug (SWD)

– Data Gateway Interface: SPI, I2C, four GPIOs

– Virtual COM port (CDC)

– Control of on-board power switch to protect connected extensions against high voltage

• Digital I/O

– Two mechanical buttons (user and reset button)

– One QTouch® button

– One yellow user LED

– Three Xplained Pro extension headers

• Two selectable target voltages

– 3.3V

– 5.0V

• Level converters between target section and EDBG section

• 32.768kHz crystal mounted

• 16MHz crystal footprint (not mounted)

• 2 CAN transceivers

• 1 LIN transceiver

– Wake-up button

– Master node pull-up enable

– Alternate LIN power jumper

• DAC output connector

• Analog voltage reference connector with filtered power supply

– SDADC VREF

– ADC/DAC VREF

• Supported with application examples in Atmel Software Framework

1.2 Kit Overview

The SAMC21N Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAMC21N18A.

The kit offers a set of features that enables the ATSAMC21N18A user to get started with the SAM C

peripherals right away and to get an understanding of how to integrate the device in their own design.

SAMC21N Xplained Pro

Figure 1-1. SAMC21N Xplained Pro Evaluation Kit Overview

SAMC21N Xplained Pro

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-bit 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 boards 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 SAMC21N 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 SAMC21N Xplained Pro:

•Xplained products - Xplained evaluation kits are a series of easy-to-use evaluation kits for

Microchip microcontrollers and other Microchip products.

– Xplained Nano: used for low pin-count devices and provides a minimalistic solution with

access to all I/O pins of the target microcontroller.

– Xplained Mini: used for medium pin-count devices and adds Arduino Uno compatible header

footprint and a prototyping area.

– Xplained Pro: used for medium to high pin-count devices that features advanced debugging

and standardized extensions for peripheral functions.

Note: All the above kits have on-board programmers/debuggers, which creates a set of low-cost

boards for evaluation and demonstration of features and capabilities of different Microchip products.

•Atmel Studio - Free IDE for the development of C/C++ and assembler code for microcontrollers.

•Microchip sample store - Microchip 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.

•Data Visualizer - Data Visualizer is a program used for processing and visualizing data. The Data

Visualizer can receive data from various sources such as the Embedded Debugger Data Gateway

Interface found on Xplained Pro boards and COM Ports.

•Hardware Users Guide in PDF format - PDF version of this User Guide.

SAMC21N Xplained Pro

•Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,

3D plots, layer plots etc

•SAMC21N Xplained Pro in Microchip website

SAMC21N Xplained Pro

3. Xplained Pro

Xplained Pro is an evaluation platform that provides the full 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)/Atmel START 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, data sheets, and example

code through Atmel Studio.

3.1 Embedded Debugger

The SAMC21N Xplained Pro contains the 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 ATSAMC21N18A.

On SAMC21N Xplained Pro, the SWD interface is connected between the EDBG and the

ATSAMC21N18A.

The Virtual COM Port is connected to a UART on the ATSAMC21N18A 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 ATSAMC21N18A 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 ATSAMC21N18A. 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

ATSAMC21N18A 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. Data Visualizer is used to send and receive data through DGI.

The EDBG controls two LEDs on SAMC21N Xplained Pro; a power LED and a status LED. The table

below shows how the LEDs are controlled in different operation modes.

SAMC21N Xplained Pro

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.

3.2 Hardware Identification System

All Xplained Pro compatible extension boards have an ATSHA204A 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'

Product Revision ASCII string 02'\0'

Product Serial Number ASCII string 1774020200000010’\0’

Minimum Voltage [mV] uint16_t 3000

Maximum Voltage [mV] uint16_t 3600

Maximum Current [mA] uint16_t 30

3.3 Power Sources

The SAMC21N Xplained Pro kit can be powered by several power sources as listed in the table below.

Table 3-3. Power Sources for SAMC21N 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

PWR

SAMC21N Xplained Pro

Power Input Voltage Requirements Current Requirements Connector Marking

maximum is 2A due to

the input protection

maximum current

specification.

Embedded debugger

USB

4.4V to 5.25V (according

to USB spec.)

500mA (according to

USB spec.)

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.

3.4 Xplained Pro Headers and Connectors

3.4.1 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

SAMC21N Xplained Pro

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