Microchip Technology SAM-IoT Wx v2 Manuale di installazione

SAM-IoT Wx v2

SAM IoT Wx v2 Hardware User Guide

Preface

Important: This document is applicable to the SAM-IoT WG v2 development board, which is

preconfigured to send data through the Google Cloud™ IoT Core. The SAM-IoT WG v2 development

board can be reconfigured to send data to different cloud service providers.

The SAM-IoT Wx v2 development board is a small and easily expandable demonstration and development platform

for IoT solutions, which is based on the SAM® microcontroller architecture using Wi-Fi® technology. The development

board is designed to demonstrate the design of a typical IoT application which can be simplified by dividing the

problem into these blocks:

•Smart: Represented by the ATSAMD21G18A microcontroller

•Secure: Represented by the ATECC608B secure element

•Connected: Represented by the ATWINC1510 Wi-Fi controller module

The SAM-IoT Wx v2 development board features the following elements:

• The on-board debugger (nEDBG) supplies full programming and debugging support through MPLAB® X IDE.

It also provides access to a serial port interface (serial to USB bridge) and one logic analyzer channel (debug

GPIO).

• The on-board debugger enumerates on the PC as a mass storage interface device for easy drag-and-drop

programming, Wi-Fi configuration, and full access to the microcontroller application Command Line Interface

(CLI).

• A mikroBUS™ socket enables the user to expand the board capabilities with the selection from 1000+

sensor and actuator options offered by MikroElektronika (www.mikroe.com) through a growing portfolio of Click

boards™.

• A light sensor is used to demonstrate the published data.

• Microchip MCP9808 high-accuracy temperature sensor used to demonstrate published data.

• Microchip MCP73871 Li-Ion/Li-Polymer battery charger with power path management.

• Microchip USB2422T USB Hub Controller - USB 2.0 USB Interface to connect the target ATSAMD21G18A MCU

with PC using USB.

•MPLAB® X IDE software to discover, configure, develop, program, and debug Microchip microcontrollers.

The following figure illustrates the SAM-IoT WG v2 development board

and its subsidiaries

User Guide DS70005506A-page 1

SAM-IoT Wx v2

and its subsidiaries

User Guide DS70005506A-page 2

Table of Contents

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

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

1.1. Features....................................................................................................................................... 4

1.2. Board Overview............................................................................................................................5

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

2.1. Quick Start....................................................................................................................................6

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

3. Application User Guide........................................................................................................................... 7

4. Hardware User Guide............................................................................................................................. 8

4.1. On-Board Debugger Overview.....................................................................................................8

4.2. On-Board Debugger Connections..............................................................................................13

4.3. Power......................................................................................................................................... 13

4.4. Components...............................................................................................................................16

5. Regulatory Approval..............................................................................................................................20

5.1. United States..............................................................................................................................20

5.2. Canada.......................................................................................................................................20

5.3. Taiwan........................................................................................................................................ 21

5.4. List of Antenna Types.................................................................................................................21

6. Hardware Revision History....................................................................................................................22

6.1. Identifying Product ID and Revision........................................................................................... 22

7. Appendix............................................................................................................................................... 23

7.1. Schematics...............................................................................................................................0

7.2. Assembly Drawing......................................................................................................................28

7.3. Mechanical Drawings................................................................................................................. 28

7.4. Bill of Materials...........................................................................................................................30

8. Revision History.................................................................................................................................... 32

The Microchip Website.................................................................................................................................33

Product Change Notification Service............................................................................................................33

Customer Support........................................................................................................................................ 33

Microchip Devices Code Protection Feature................................................................................................33

Legal Notice................................................................................................................................................. 33

Trademarks.................................................................................................................................................. 34

Quality Management System....................................................................................................................... 35

Worldwide Sales and Service.......................................................................................................................36

SAM-IoT Wx v2

and its subsidiaries

User Guide DS70005506A-page 3

1. Introduction

1.1 Features

The following are key features of the SAM-IoT WG v2 development board:

•ATSAMD21G18A Arm® Cortex®-M0+ microcontroller

•ATWINC1510 Wi-Fi module

•ATECC608B CryptoAuthentication™ device

• Pre-configured for Microchip accounts with cloud service providers

– Google Cloud IoT Core

• Four user LEDs

• Two mechanical buttons

• TEMT6000 light sensor

•MCP9808 temperature sensor

• mikroBUS socket

• On-board debugger

– Board identification in Microchip MPLAB X IDE

– One green board power and status LED

– Virtual serial port (USBCDC)

– One logic analyzer channels (debug GPIO)

• Supports drag-and-drop feature

• USB and battery powered

•USB2422T USB hub

•MIC33050 Buck regulator

•MCP73871 Li-Ion/Li-Polymer battery charger

• Fixed 3.3V

SAM-IoT Wx v2

Introduction

and its subsidiaries

User Guide DS70005506A-page 4

1.2 Board Overview

The SAM-IoT Wx v2 development board is a hardware platform used to evaluate and develop IoT solutions with

the Microchip ATSAMD21G18 Arm Cortex-M0+ based Flash microcontroller, ATECC608B secure element, and the

ATWINC1510 Wi-Fi controller module.

The pre-programmed demonstration application publishes data from the on-board light and temperature sensors read

by the ATSAMD21G18A MCU to the cloud (every second). Any data received from the cloud over the subscribed

topic is sent to the virtual serial port and can be displayed in a serial terminal application. The ATWINC1510 needs a

connection to the Wi-Fi network with an internet connection. The ATECC608B is used to authenticate the hardware

with the cloud to uniquely identify every board. The demonstration application source code can be modified to publish

data to a personal cloud account to begin with a custom cloud application.

The following figure shows the key features and pinout of the SAM-IoT Wx v2 development board.

Figure 1-1. SAM-IoT Wx v2 Development Board

Micro USB Port

Power/Status LED

nEDBG onboard Programmer/debugger

High Speed USB HUB Controller

ADC

RESET

SPI CS

SPI SCK

SPI MISO

SPI MOSI

3.3 V

GND

TEMT6000 Light Sensor

ATSAMD21G18A Microcontroller

User Switch 1

ATWINC1510 Module

Timer/PWM

Interrupt

UART Rx

UART Tx

I2C SCL

I2C SDA

5.0 V

ATECC608B Secure Element

User Switch 0 Error Status LED

Data Transfer LED

Cloud Connection Status LED

Wi-Fi Status LED

GND

LiPo Connector

MCP73871 LiPo Charger

MIC33050 Voltage Regulator

Timer/PWM

LiPo Charge Status LED

SAM-IoT Wx v2

Introduction

and its subsidiaries

User Guide DS70005506A-page 5

2. Getting Started

2.1 Quick Start

Follow these steps to exploring the SAM-IoT Wx v2 development board:

1. Connect the SAM-IoT Wx v2 development board to the computer.

2. Open the CLICK-ME.HTM file on the Curiosity mass storage disk and perform these actions:

a. Download the latest application.hex firmware.

b. Download the Wi-Fi configuration file WIFI.cfg by entering the required Wi-Fi credentials.

3. Drag-and-drop the application .hex file on the Curiosity drive and wait till update completes.

4. Drag-and-drop the WIFI.cfg configuration file on the Curiosity drive.

The development board will connect to the Wi-Fi network and send data to the web site (mentioned in Step 2)

through a cloud provider.

2.2 Design Documentation and Relevant Links

The following list provides links to the relevant documents and software for the SAM-IoT Wx v2 development board.

•MPLAB Data Visualizer : A program used for processing and visualizing data. The MPLAB Data Visualizer can

receive data from various sources, such as serial ports and the on-board debugger’s Data Gateway Interface, as

found on the Curiosity Nano and Xplained Pro boards.

•MPLAB® X IDE : A software program that runs on a PC (Windows®, Mac OS®, Linux®) to develop applications

for Microchip microcontrollers and digital signal controllers. It is called the Integrated Development Environment

(IDE) as it provides a single integrated environment to develop code for embedded microcontrollers.

•Microchip Sample Store: Users can order device samples here.

SAM-IoT Wx v2

Getting Started

and its subsidiaries

User Guide DS70005506A-page 6

3. Application User Guide

The ATSAMD21G18A microcontroller is mounted on the SAM-IoT Wx v2 development board and is pre-programmed

with an application ready to publish data to a Microchip account with a cloud service provider and subscribe to

data sent from iot.microchip.com through the cloud service provider. The SAM-IoT WG v2 development board

is pre-configured for Google Cloud IoT Core. The data is read from the cloud and presented to the user on

iot.microchip.com.

The latest firmware and application user’s guide are available for download at EV62V87A kit page.

SAM-IoT Wx v2

Application User Guide

and its subsidiaries

User Guide DS70005506A-page 7

4. Hardware User Guide

4.1 On-Board Debugger Overview

The SAM-IoT Wx v2 development board contains an on-board debugger for programming and debugging. The

on-board debugger is a composite USB device consisting of these interfaces:

• A debugger that can program and debug the ATSAMD21G18A in MPLAB X IDE.

• A mass storage device that allows drag-and-drop programming of the ATSAMD21G18A.

• A virtual serial port (CDC) that is connected to a Universal Asynchronous Receiver/Transmitter (UART) on

the ATSAMD21G18A and provides an easy way to communicate with the target application through terminal

software.

• A Data Gateway Interface (DGI) for code instrumentation with logic analyzer channels (debug GPIO) to visualize

program flow.

The on-board debugger controls a Power and Status LED (marked PS) on the SAM-IoT Wx v2 development board.

The following table shows how the LED is controlled in different operation modes.

Table 4-1. On-Board Debugger Overview

Operation Mode Power and Status LED

Boot Loader mode The LED blinks slowly during power-up.

Power-up The LED is ON.

Normal operation The LED is ON.

Programming Activity indicator: The LED blinks slowly during programming/debugging.

Drag-and-drop programming Success: The LED blinks slowly for 2 seconds.

Failure: The LED blinks rapidly for 2 seconds.

Fault The LED blinks rapidly if a power fault is detected.

Sleep/Off

The LED is OFF.

The on-board debugger is either in Sleep mode or powered-down.

This can occur if the board is externally powered.

Info: Slow blinking is approximately 1 Hz, and rapid blinking is approximately 5 Hz.

4.1.1 Debugger

The on-board debugger on the SAM-IoT Wx v2 development board appears as a mass storage device with a CDC

on the Host computer’s USB subsystem. The debugger supports full-featured programming and debugging of the

ATSAMD21G18A using MPLAB X IDE or other selected third-party IDEs.

Remember: Ensure that the firmware for the debugger is up-to-date. Firmware upgrades are done

automatically when using MPLAB X IDE.

4.1.2 Virtual Serial Port

The virtual serial port (CDC) is a general purpose serial bridge between the Host PC and a target device.

4.1.2.1 Overview

The on-board debugger implements a composite USB device that includes a standard Communications Device Class

(CDC) interface, which appears on the Host as a virtual serial port. The CDC can be used to stream arbitrary data

in both directions between the Host computer and the target: All characters sent through the virtual serial port on the

SAM-IoT Wx v2

Hardware User Guide

and its subsidiaries

User Guide DS70005506A-page 8

Host computer will be transmitted as UART on the CDC TX pin of the debugger, and UART characters captured on

the CDC RX pin of the debugger will be returned to the Host computer through the virtual serial port.

Figure 4-1. CDC Connection

Info: As shown above, the CDC TX pin of the debugger is connected to a UART RX pin on the target for receiving

characters from the Host computer. Similarly, the CDC RX pin of the debugger is connected to a UART TX pin on the

target for transmitting characters to the Host computer.

4.1.2.2 Operating System Support

On Windows machines, the CDC will enumerate as Curiosity Virtual COM Port and appear in the ports section of the

Windows Device Manager. The COM port number can also be found there.

Important: On the older Windows systems, a USB driver is required for CDC. This driver is included in

installations of MPLAB X IDE.

On Linux machines, the CDC will enumerate and appear as /dev/ttyACM#.

Important: The tty* devices belong to the dialout group in Linux, therefore it is necessary to become a

member of that group to have permissions to access the CDC.

On MAC machines, the CDC will enumerate and appear as /dev/tty.usbmodem#. Depending on which terminal

program is used, it will appear in the available list of modems as usbmodem#.

Important: For all operating systems, ensure to use a terminal emulator that supports DTR signaling.

Refer to the Signaling for additional information.

4.1.2.3 Limitations

Not all UART features are implemented in the on-board debugger CDC. The constraints are outlined here:

•Baud rate: Must be in the range of 1200 bps to 500 kbps. Any baud rate outside this range will be set to the

closest limit, without warning. Baud rate can be changed on-the-fly.

•Character format: Only 8-bit characters are supported.

•Parity: Can be odd, even, or none.

•Hardware flow control: Not supported.

•Stop bits: One or two bits are supported.

4.1.2.4 Signaling

During USB enumeration, the Host OS will start both communication and data pipes of the CDC interface. At this

point, it is possible to set and read back the baud rate and other UART parameters of the CDC, but data sending and

receiving will not be enabled.

When a terminal connects on the Host, it must assert the DTR signal. As this is a virtual control signal implemented

on the USB interface, it is not physically present on the board. Asserting the DTR signal from the Host will indicate to

SAM-IoT Wx v2

Hardware User Guide

and its subsidiaries

User Guide DS70005506A-page 9

the on-board debugger that a CDC session is active. The debugger will then enable its level shifters (if available) and

start the CDC data send and receive mechanisms.

Deasserting the DTR signal will not disable the level shifters but will disable the receiver, therefore no further data will

be streamed to the Host. Data packets that are already queued up for sending to the target will continue to be sent

out, but no further data will be accepted.

Remember: Set up the terminal emulator to assert the DTR signal. Without the signal, the on-board

debugger will not send or receive any data through its UART.

Tip: The CDC TX pin of the on-board debugger will not be driven until the CDC interface is enabled

by the Host computer. Also, there are no external pull-up resistors on the CDC lines connecting the

debugger and the target, which means that during power-up, these lines are floating. To avoid any glitches

resulting in unpredictable behavior, such as framing errors, the target device must enable the internal

pull-up resistor on the pin connected to the CDC TX pin of the debugger.

4.1.2.5 Advanced Use

CDC Override Mode

In normal operation, the on-board debugger is a true UART bridge between the Host and the device. However, in

certain use cases, the on-board debugger can override the basic operating mode and use the CDC TX and RX pins

for other purposes.

Dropping a text file into the mass storage drive of the on-board debugger can be used to send characters out of the

CDC TX pin on the debugger. The file name and extension are trivial, but the text file must start with the characters:

CMD:SEND_UART=

The maximum message length is 50 characters. All remaining data in the frame is ignored.

The default baud rate used in this mode is 9600 bps, but if the CDC is already active or has been configured, the

previously used baud rate still applies.

USB-Level Framing Considerations

Sending data from the Host to the CDC can be done byte-wise or in blocks, which will be chunked into 64-byte USB

frames. Each such frame will be queued up for sending to the CDC TX pin of the debugger. Transferring a small

amount of data per frame can be inefficient, particularly at low-baud rates, as the on-board debugger buffers frames

and not bytes. A maximum of four 64-byte frames can be active at any time. The on-board debugger will throttle the

incoming frames accordingly. Sending full 64-byte frames containing data is the most efficient method.

When receiving data on the CDC RX pin of the debugger, the on-board debugger will queue up the incoming bytes

into 64-byte frames, which are sent to the USB queue for transmission to the Host when they are full. Incomplete

frames are also pushed to the USB queue at approximately 100 ms intervals, triggered by USB start-of-frame tokens.

Up to eight 64-byte frames can be active at any time.

If the Host (or the software running on it) fails to receive data fast enough, an overrun will occur. When this happens,

the last-filled buffer frame will be recycled instead of being sent to the USB queue, and a full frame of data will be

lost. To prevent this occurrence, the user must ensure that the CDC data pipe is being read continuously, or the

incoming data rate must be reduced.

4.1.3 Mass Storage Device

The on-board debugger includes a simple mass storage device implementation, which is accessible for read/write

operations through the Host operating system to which it is connected.

The mass storage device provides the following:

• Read access to basic text and HTML files for detailed kit information and support.

SAM-IoT Wx v2

Hardware User Guide

and its subsidiaries

User Guide DS70005506A-page 10

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