Microchip Technology SAM E51 Curiosity Nano Manuale utente

EV76S68A

SAM E51 Curiosity Nano User Guide

Preface

The SAME51J20A Curiosity Nano Evaluation Kit (EV76S68A) is a hardware platform used to evaluate the

SAME51J20A microcontroller (MCU), and it is supported by the MPLAB® X Integrated Development Environment

(IDE). The evaluation kit provides easy access to the features of the SAME51J20A to integrate the device into a

custom design. The Curiosity Nano series of evaluation kits includes an On-Board Nano Debugger, therefore no

external tools are necessary to program the SAME51J20A device. The SAME51J20A Curiosity Nano Evaluation Kit

is shown in the following figure.

Table of Contents

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

1. Introduction............................................................................................................................................. 3

1.1. Features....................................................................................................................................... 3

1.2. Kit Overview................................................................................................................................. 3

2. Getting Started........................................................................................................................................ 4

2.1. Curiosity Nano Quick Start........................................................................................................... 4

3. Curiosity Nano.........................................................................................................................................5

3.1. On-Board Debugger..................................................................................................................... 5

3.2. Curiosity Nano Standard Pinout................................................................................................... 6

3.3. Power Supply............................................................................................................................... 7

3.4. Disconnecting the On-Board Debugger....................................................................................... 8

3.5. Current Measurement................................................................................................................ 10

4. Hardware...............................................................................................................................................11

4.1. Connectors................................................................................................................................. 11

4.2. Peripherals................................................................................................................................. 12

4.3. On-Board Debugger Implementation......................................................................................... 13

5. Hardware Revision History....................................................................................................................15

5.1. Identifying Product ID and Revision........................................................................................... 15

6. Schematics............................................................................................................................................16

7. Revision History.................................................................................................................................... 19

The Microchip Website.................................................................................................................................20

Product Change Notification Service............................................................................................................20

Customer Support........................................................................................................................................ 20

Microchip Devices Code Protection Feature................................................................................................ 20

Legal Notice................................................................................................................................................. 20

Trademarks.................................................................................................................................................. 21

Quality Management System....................................................................................................................... 21

Worldwide Sales and Service.......................................................................................................................22

EV76S68A

1. Introduction

The SAME51J20A Curiosity Nano Evaluation Kit is a hardware platform used to evaluate the SAME51J20A

microcontroller (MCU). Supported by the MPLAB® X Integrated Development Environment (IDE), the kit provides

easy access to the features of the SAME51J20A, and explains how to integrate the device into a custom design. The

Curiosity Nano series of evaluation kits include an on-board debugger. No external tools are necessary to program

the SAME51J20A.

1.1 Features

• SAME51J20A microcontroller

• One user LED (yellow)

• One mechanical user switch

• On-board debugger

– Board identification in MPLAB X IDE

– One Green power/status LED

– Programming and debugging

– Virtual COM port (CDC)

– One logic analyzer (DGI GPIO)

• USB powered

• Adjustable target voltage

– MIC5353 LDO regulator controlled by the on-board debugger

– 1.8-3.6v output voltage

– 500 mA maximum output current (limited by ambient temperature and output voltage)

1.2 Kit Overview

The SAME51J20A Curiosity Nano evaluation kit is a hardware platform used to evaluate the SAME51J20A, as shown

in the figure below.

Figure 1-1. SAME51J20A

Micro‐USB

Connector

Power/Status

LED

Nano

Debugger

ATSAME51J20A

MCU

UserLED

(LED0)

UserSwitch

(SW0)

32.768kHz

Crystal

EV76S68A

Introduction

2. Getting Started

2.1 Curiosity Nano Quick Start

Follow these steps to exploring the Curiosity Nano platform:

1. Download MPLAB X IDE.

2. Launch MPLAB X IDE.

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 Curiosity Nano kit is connected to the user 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, Windows 8, and Windows 10. The drivers for the kit are included with MPLAB X IDE.

Once the Curiosity Nano board is powered, the green status LED will be lit and MPLAB X IDE will auto-detect which

Curiosity Nano board is connected. MPLAB X IDE will present relevant information, such as data sheets and kit

documentation. The SAME51J20A device is programmed and debugged by the on-board debugger, therefore no

external programmer or debugger tool is required.

EV76S68A

Getting Started

3. Curiosity Nano

The Curiosity Nano is an evaluation platform that provides a set of small boards with access to most of the

microcontroller’s I/O. The platform consists of a series of low pin-count microcontroller (MCU) boards, which are

integrated with MPLAB X IDE to present relevant user guides, application notes, data sheets, and example code. The

platform features a virtual COM port (CDC) for serial communication to a host PC, and a Data Gateway Interface

(DGI) GPIO.

3.1 On-Board Debugger

The SAME51J20A Curiosity Nano contains an on-board debugger for programming and debugging. The on-board

debugger is a composite USB device of several interfaces: a debugger, a mass storage device, a data gateway, and

a virtual COM port (CDC). Together with MPLAB X IDE, the on-board debugger interface can program and debug the

SAME51J20A. A Data Gateway Interface (DGI) is available for use with logic analyzer channels for code

instrumentation, and to visualize program flow. DGI GPIOs can be graphed using the Data Visualizer. The Virtual

COM port is connected to a UART on the SAME51J20A and provides an easy way to communicate with the target

application through terminal software. The on-board debugger controls one Power/Status LED (marked PS) on the

SAME51J20A Curiosity Nano board. The following table shows how the LED is controlled in different operation

modes.

Table 3-1. On-Board Debugger LED Control

Operation Mode Status LED

Boot Loader mode LED blink at 1 Hz during power up.

Power-up LED is lit - constant.

Normal operation LED is lit - constant.

Programming Activity indicator; the LED flashes slowly during programming or debugging.

Fault The LED flashes fast if a power fault is detected.

Sleep/Off LED is Off. The on-board debugger is either in Sleep mode or powered down. This can occur if

the kit is externally powered.

3.1.1 Virtual COM Port

A general-purpose USB serial bridge between a host PC and a target device.

3.1.1.1 Overview

The debugger implements a composite USB device that includes a standard Communications Device Class (CDC)

interface, which appears on the host as a virtual COM Port. The CDC can be used to stream arbitrary data in both

directions between the host and the target. Characters sent from the host will appear in UART form on the CDC TX

pin, and UART characters sent into the CDC RX pin will be sent back to the host. On Windows machines, the CDC

will enumerate as the Curiosity Virtual COM Port and appear in the Ports section of the device manager. The COM

port number is usually shown here.

Tip: On older Windows systems a USB driver is required for the CDC. This driver is included in MPLAB X

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

3.1.1.2 Limitations

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

•Baud rate: Must be in the range of 1200 bps to 500 kbps. Values outside this range will be capped to these

values without warning. Baud rate can be changed on-the-fly.

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Curiosity Nano

•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

3.1.1.3 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. This is a virtual

control signal that is implemented on the USB interface but not in the hardware on the debugger. Asserting a DTR

from the host will indicate to the debugger that a CDC session is active, and it will enable its level shifters (if

available), and start the CDC data send and receive mechanisms. Disserting the DTR signal will not disable the level

shifters, but it will disable the receiver, hence 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.

3.1.1.4 Advanced Use

In CDC Override mode in normal operation, the on-board debugger is a true UART bridge between the host and the

device. However, under certain use cases, the debugger can override the Basic Operating mode and use the CDC

pins for other purposes. Dropping a text file (with extension .txt) into the debugger’s mass storage drive can be used

to send characters out of the CDC TX pin. The text file must start with the characters “CMD:SEND_UART =”. The

maximum message length is 50 characters, and 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 baud rate last used 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 divided into 64-byte USB

frames. Each frame will be queued up for sending to the CDC TX pin. Sending a small amount of data per frame can

be inefficient, particularly at low baud rates, since the debugger buffers per frame, not byte. A maximum of 4 x 64-

byte frames can be active at any time, the debugger will throttle the incoming frames accordingly. Sending full 64-

byte frames containing data is the most efficient.

When receiving data from the target, the debugger will queue up 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 8 x 64-byte frames can be

active at any time. If the host, or software running on it, fails to receive the 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.

3.2 Curiosity Nano Standard Pinout

The twelve edge connections closest to the USB connector on the Curiosity Nano kits have a standardized pinout.

The program/debug pins have different functions depending on the target programming interface as shown in the

following table and figure.

Table 3-2. Curiosity Nano Standard Pinout

Debugger Signal ICSP Target Description

NC - No connect.

ID - ID line for extensions.

CDC RX UART TX USB CDC RX line.

CDC TX UART RX USB CDC TX line.

DBG1 SWCLK Debug clock line

DBG2 GPIO DGI GPIO

EV76S68A

Curiosity Nano

...........continued

Debugger Signal ICSP Target Description

VTG - Target voltage

GND - Common ground.

DBG0 SWDATA Debug data line.

DBG3 nRESET Reset line

VOFF - Voltage Off input.

VBUS - VBUS voltage for external use.

Figure 3-1. Curiosity Nano Standard Pinout

3.3 Power Supply

The kit is powered through the USB port and contains two regulators for generating 3.3V for the debugger, and an

adjustable regulator for the target. The voltage from the USB connector can vary between 4.4V to 5.25V (according

to the USB specification) and will limit the maximum voltage to the target. The following figure shows the entire power

supply system on the SAME51J20A Curiosity Nano.

Figure 3-2. Power Supply Block Diagram

3.3.1 Target Regulator

The target voltage regulator is a MIC5353 variable output LDO. The on-board debugger can adjust the voltage output

that is supplied to the kit target section by manipulating the feedback voltage of the MIC5353. The hardware

implementation is limited to an approximate voltage range from 1.8V to 5.1V. Additional output voltage limits are

EV76S68A

Curiosity Nano

configured in the debugger firmware to ensure that the output voltage never exceeds the hardware limits of the

SAME51J20A microcontroller. The voltage limits configured in the on-board debugger on the SAME51J20A Curiosity

Nano are 1.8V–3.6V. The target voltage is set to 3.3V in production and can be changed through MPLAB X IDE. Any

change to the target voltage done in MPLAB X IDE is persistent, even through a power toggle. The MIC5353

supports a maximum current load of 500 mA. It is an LDO regulator in a small package, placed on a small PCB, and

the thermal shutdown condition can be reached at lower loads than 500 mA. The maximum current load depends on

the input voltage, set output voltage, and the ambient temperature. The following figure shows the safe operation

area for the regulator, with an input voltage of 5.1V and an ambient temperature of 23°C.

Figure 3-3. Target Regulator Safe Operation Area

3.3.2 External Supply

The SAME51J20A Curiosity Nano can be powered by an external voltage instead of the on-board target regulator.

When the Voltage Off (VOFF) pin is shorted to ground (GND) the on-board debugger firmware disables the target

regulator and it is safe to apply an external voltage to the VTG pin.

WARNING

Applying an external voltage to the VTG pin without shorting the VOFF to GND may cause permanent

damage to the kit.

WARNING

Absolute maximum external voltage is 5.5V for the level shifters on the board. Applying a higher voltage

may cause permanent damage to the kit.

Programming, debugging, and data streaming is still possible while using external power: the debugger and signal

level shifters will be powered from the USB cable. Both regulators, the debugger, and the level shifters are powered

down when the USB cable is removed.

3.4 Disconnecting the On-Board Debugger

The following block diagram shows all the connections between the debugger and the SAME51J20A microcontroller.

The rounded boxes represent connections to the board edge on the SAME51J20A Curiosity Nano. The signal names

are shown in the following figure and printed in silkscreen on the bottom side of the board.

EV76S68A

Curiosity Nano

Figure 3-4. On-Board Debugger Connections

By cutting the GPIO straps with a sharp tool, as shown in the following figure, all I/O connected between the

debugger and the SAME51J20A are completely disconnected. To completely disconnect the target regulator, cut the

VTG strap shown in the following figure:

Figure 3-5. Location of GPIO Straps and VTG Strap

Tip:

1. Cutting the connections to the debugger will disable programming, debugging, data streaming, and

the target power supply. The signals will also be disconnected from the board edge next to the on-

board debugger section.

2. Solder in 0Ω resistors across the footprints or short-circuit them with tin solder to reconnect any cut

signals.

EV76S68A

Curiosity Nano

3.5 Current Measurement

The power to the SAME51J20A is connected from the on-board power supply to the target voltage supply (VTG) with

a cut strap as shown in Disconnecting the On-Board Debugger. To measure the power consumption of the

SAME51J20A and other peripherals connected to the board, cut the strap and connect an ammeter over the strap.

The ammeter can be connected between the target VTG pad edge connector and an external power supply for easy

measurement. Alternatively, an external power supply can be used as described in External Supply.

Important: The on-board level shifters will draw a small amount of current even when they are not in use.

A maximum of 10 μA can be drawn from the VTG net and an additional 2 μA can be drawn from each I/O

pin connected to a level shifter for a total of 20 μA. Disconnect the on-board debugger and level shifters as

described in Disconnecting the On-Board Debugger to prevent any leakage.

EV76S68A

Curiosity Nano

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