Microchip Technology SAM E51 Curiosity Nano User manual

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.
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 1

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
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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
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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.
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Getting Started
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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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•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
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...........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
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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.
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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.
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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.
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4. Hardware
4.1 Connectors
4.1.1 SAME51J20A Curiosity Nano Pinout
All of the SAME51J20A I/O pins are accessible at the edge connectors on the SAME51J20A Curiosity Nano except
the button and LED (PA15, PA14). The following figure shows the kit pinout. The RA30 and RA31 pins are only
available at the edge connector in the debugger section as long as the straps on the bottom are not cut.
Figure 4-1. SAME51J20A Curiosity Nano Pinout
USB
DEBUGGER
SAME51J20A
SW0
LED0
PS LED
NC
NC
ID
ID
CDC RX
CDC RX
SEMCOM5 PAD0 TXPB16
CDC TX
CDC TX
SERCOM5 PAD1 RXPB17
DBG1
DBG1
PA30
DBG2
DBG2
PB30
PB12
PB12
SERCOM4 PAD0 TXCAN1 TXTC4 WO0X26/Y26
PB13
PB13
SERCOM4 PAD1 RXCAN1 RXTC4 WO1X27/Y27
PA12
PA12
SERCOM2 PAD0 SDATC2 WO0
PA13
PA13
SERCOM2 PAD1 SCLTC2 WO1
PA16
PA16
SERCOM1 PAD0 MOSITC2 WO0X10/Y10
PA19
PA19
SERCOM1 PAD3 MISOTC3 WO1X13/Y13
PA17
PA17
SERCOM1 PAD1 SCKTC2 WO1X11/Y11
PA18
PA18
SERCOM1 PAD2 SSTC3 WO0X12/Y12
GND
GND
PA8
PA8
SERCOM0 PAD0 TXADC0 AIN[8]ADC1 AIN[2]X6/Y6
PA9
PA9
SERCOM0 PAD1 RXADC0 AIN[9]ADC1 AIN[3]X7/Y7
PB14
PB14
SERCOM4 PAD2CAN 1 TXX28/Y28
PA6
PA6
X4/Y4
PA22
PA22
SERCOM3 PAD0 TXCAN0 TXX16/Y16
PA23
PA23
SERCOM3 PAD1 RXCAN0 RXX17/Y17
PA20
PA20
X14/Y14
PA21
PA21
X15/Y15
GND
GND
PB2
PB2
SERCOM5 PAD0 TXADC0 AIN[14]TC6 WO0X20/Y20
PB31
PB31
SERCOM5 PAD0 RX
PB22
PB22
SOF_1kHz
PB15
PB15
SERCOM4 PAD3CAN1 RXX29/Y29
VBUS
VBUS
VOFF
VOFF
DBG3
DBG3
RESET
DBG0
DBG0
SWDIO
GND
GND
VTG
VTG
PA7
PA7
ADC0 AIN[7] TC1 WO0 X5/Y5
PA4
PA4
ADC0 AIN[4] TC0 WO0 X3/Y3
PB9
PB9
ADC0 AIN[3] ADC1 AIN[1] TC4 WO1 X2/Y26
PA11
PA11
ADC0 AIN[11] SERCOM0 PAD3 TC1 WO1 X9/Y9
PA10
PA10
ADC0 AIN[10] SERCOM0 PAD2 TC1 WO0 X8/Y8
PB8
PB8
ADC0 AIN[2] ADC1 AIN[0] TC4 WO0 X1/Y1
PB3
PB3
ADC0 AIN[15] TC6 WO1 X21/Y21
PA2
PA2
ADC0 AIN[0] DAC0 X0/Y0
GND
GND
PB4
PB4
ADC1 AIN[6] X22/Y22
PB5
PB5
ADC1 AIN[7] X23/Y23
PB6
PB6
ADC1 AIN[8] X24/Y24
PB7
PB7
ADC1 AIN[9] X25/Y25
PB1
PB1
ADC0 AIN[13] X31/Y31
PB0
PB0
ADC0 AIN[12] TC7 WO0 X30/Y30
PA27
PA27
X18/Y18
PA5
PA5
DAC1
GND
GND
PB23
PB23
TC7 WO1
PA3
PA3
ADC0 AIN[1]
PB10
PB10
TC5 WO0
PB11
PB11
SERCOM4 PAD3 TC5 WO1
DEBUGGER
SAME51J20A
Analog
Debug
I2C
SPI
UART
Peripheral
Port
PWM
Power
Ground
Touch
CAN
USB
Shared pin
SAME51J20A
Curiosity Nano
Note: Not all pin functions are listed in the diagram. Additional functions are available on these pins, for a list of
additional functions please consult the latest data sheet available at www.microchip.com.
4.1.2 SAME51J20A Curiosity Nano Base Quick Reference
The SAME51J20A is compatible with the Curiosity Nano Base for click boards™ (AC164162). The following figure
shows a simplified reference to enable quicker development. For additional information, visit www.microchip.com/
developmenttools/ProductDetails/AC164162.
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USB
DEBUGGER
SAME51J20A
SW0
LED0
PS LED
NC
NC
ID
ID
CDC RX
CDCRX
SEMCOM5 PAD0 TXPB16
CDC TX
CDCTX
SERCOM5 PAD1 RXPB17
DBG1
DBG1
PA30
DBG2
DBG2
PB30
PB12
PB12
SERCOM4 PAD0 TXCAN1 TXTC4 WO0X26/Y26
PB13
PB13
SERCOM4 PAD1 RXCAN1 RXTC4 WO1X27/Y27
PA12
PA12
SERCOM2 PAD0 SDATC2 WO0
PA13
PA13
SERCOM2 PAD1 SCLTC2 WO1
PA16
PA16
SERCOM1 PAD0 MOSITC2 WO0X10/Y10
PA19
PA19
SERCOM1 PAD3 MISOTC3 WO1X13/Y13
PA17
PA17
SERCOM1 PAD1 SCKTC2 WO1X11/Y11
PA18
PA18
SERCOM1 PAD2 SSTC3 WO0X12/Y12
GND
GND
PA8
PA8
SERCOM0 PAD0 TXADC0 AIN[8]ADC1 AIN[2]X6/Y6
PA9
PA9
SERCOM0 PAD1 RXADC0 AIN[9]ADC1 AIN[3]X7/Y7
PB14
PB14
SERCOM4 PAD2CAN 1 TXX28/Y28
PA6
PA6
X4/Y4
PA22
PA22
SERCOM3 PAD0 TXCAN0 TXX16/Y16
PA23
PA23
SERCOM3 PAD1 RXCAN0 RXX17/Y17
PA20
PA20
X14/Y14
PA21
PA21
X15/Y15
GND
GND
PB2
PB2
SERCOM5 PAD0 TXADC0 AIN[14]TC6 WO0X20/Y20
PB31
PB31
SERCOM5 PAD0 RX
PB22
PB22
SOF_1kHz
PB15
PB15
SERCOM4 PAD3CAN1 RXX29/Y29
VBUS
VBUS
VOFF
VOFF
DBG3
DBG3
RESET
DBG0
DBG0
SWDIO
GND
GND
VTG
VTG
PA7
PA7
ADC0 AIN[7] TC1 WO0 X5/Y5
PA4
PA4
ADC0 AIN[4] TC0 WO0 X3/Y3
PB9
PB9
ADC0 AIN[3] ADC1 AIN[1] TC4 WO1 X2/Y26
PA11
PA11
ADC0 AIN[11] SERCOM0 PAD3 TC1 WO1 X9/Y9
PA10
PA10
ADC0 AIN[10] SERCOM0 PAD2 TC1 WO0 X8/Y8
PB8
PB8
ADC0 AIN[2] ADC1 AIN[0] TC4 WO0 X1/Y1
PB3
PB3
ADC0 AIN[15] TC6 WO1 X21/Y21
PA2
PA2
ADC0 AIN[0] DAC0 X0/Y0
GND
GND
PB4
PB4
ADC1 AIN[6] X22/Y22
PB5
PB5
ADC1 AIN[7] X23/Y23
PB6
PB6
ADC1 AIN[8] X24/Y24
PB7
PB7
ADC1 AIN[9] X25/Y25
PB1
PB1
ADC0 AIN[13] X31/Y31
PB0
PB0
ADC0 AIN[12] TC7 WO0 X30/Y30
PA27
PA27
X18/Y18
PA5
PA5
DAC1
GND
GND
PB23
PB23
TC7 WO1
PA3
PA3
ADC0 AIN[1]
PB10
PB10
TC5 WO0
PB11
PB11
SERCOM4 PAD3 TC5 WO1
DEBUGGER
SAME51J20A
Analog
Debug
I2C
SPI
UART
Peripheral
Port
PWM
Power
Ground
Touch
CAN
USB
Shared pin
SAME51J20A
Curiosity Nano
1
AN PWM
RST INT
CS RX
SCK TX
MISO SCL
MOSI SDA
+3.3V +5V
GND GND
2
AN PWM
RST INT
CS RX
SCK TX
MISO SCL
MOSI SDA
+3.3V +5V
GND GND
3
AN PWM
RST INT
CS RX
SCK TX
MISO SCL
MOSI SDA
+3.3V +5V
GND GND
Xplained Pro Extension
EXT1
1 2
19 20
Curiosity Nano Base
for click boards TM
PA2 PA10
PA7 PA4
PA18 PB13
PA17 PB12
PA19 PA13
PA16 PA12
+3.3V +5V
GND GND
PB3 PA11
PA6 PB14
PB5 PA9
PA17 PA8
PA19 PA13
PA16 PA12
+3.3V +5V
GND GND
PB8 PB9
PB6 PB7
PB4 PB13
PA17 PB12
PA19 PA13
PA16 PA12
+3.3V +5V
GND GND
ID GND
PB3 PB8
PA6 PB6
PA11 PB9
PB14 PB4
PA12 PA13
PA9 PA8
PB5 PA16
PA19 PA17
GND +3.3V
4.2 Peripherals
4.2.1 LED
One yellow user LED is available on the SAME51J20A Curiosity Nano kit that can be controlled with either GPIO or
PWM. The LED can be activated by driving the connected I/O line to GND.
Table 4-1. LED Connection
SAME51J20A Function Shared Functionality
PA14 Yellow LED0 None
4.2.2 Mechanical Switch
The SAME51J20A Curiosity Nano has one mechanical switch. This is a generic user configurable switch. When the
switch is pressed, it will drive the I/O line to ground (GND).
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Tip: There is no pull-up resistor connected to the generic user switch. Remember to enable the internal
pull-up in the SAME51J20A to use the switch.
Table 4-2. Mechanical Switch
SAME51J20A Function Shared Functionality
PA15 User Switch SW0 None
4.2.3 Crystal
The SAME51J20A Curiosity Nano board has a 32.768 kHz crystal.
By default, the crystal is populated and connected to the SAME51J20A and these pins are not usable as a GPIO. To
use the crystal, no hardware modifications are required.
Table 4-3. Crystal Connections
SAME51J20A pin Function Shared Functionality
PA00 XIN32 None
PA01 XOUT32 None
4.3 On-Board Debugger Implementation
The SAME51J20A Curiosity Nano features an on-board debugger that can be used to program and debug the
SAME51J20A using a Serial Wire Debug (SWD). The on-board debugger also includes a virtual COM port interface
over UART and DGI GPIO. MPLAB X IDE can be used as a front-end for the on-board debugger for programming
and debugging. A data visualizer can be used as a front-end for the CDC and DGI GPIO.
4.3.1 On-Board Debugger Connections
The following table shows the connections between the target and the debugger section. All connections between the
target and the debugger are tri-stated as long as the debugger is not actively using the interface, therefore there is
little contamination of the signals and the pins can be configured to the application requirements. For additional
information on how to use the capabilities of the on-board debugger, see Curiosity Nano.
Table 4-4. On-Board Debugger Connections
SAME51J20A pin Debugger pin Function Shared Functionality
PB17 CDC TX UART TX (SAME51J20A RX line) Edge Connector
PB16 CDC RX UART RX (SAME51J20A TX line Edge Connector
PA31 DBG0 SWDATA Edge Connector
PA30 DBG1 SWCLK Edge Connector
PB30 DBG2 SWO Edge Connector
nRESET DBG3 nRESET Edge Connector
VCC_TARGET VCC_LEVEL 1.8-3.6v supply voltage Edge Connector
GND GND Common ground Edge Connector
4.3.2 Extra Ports
This implementation has two pins that are not brought out to the edge connector, the access to these are provided as
surface mount test points.
EV76S68A
Hardware
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 13

Table 4-5. Extra Ports
Pin Port Functions
45 PA24 USB/DM CAN0/TX TC5/WO[0] SERCOM3 & SERCOM5 -PAD[2] CCL/IN[8]
46 PA25 USB/DP CAN0/RX TC5/WO[1] SERCOM3 & SERCOM5 -PAD[3] CCL/OUT[2]
EV76S68A
Hardware
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 14

5. Hardware Revision History
This user guide provides the latest available revision of the kit. This chapter contains information about known issues,
a revision history of older revisions, and how older revisions differ from the latest revision.
5.1 Identifying Product ID and Revision
The revision and product identifier of Curiosity Nano boards can be found in two ways: either through the MPLAB X
IDE or by looking at the sticker on the bottom side of the PCB. By connecting a Curiosity Nano board to a computer
with MPLAB X IDE running, an information window will pop up. The first six digits of the serial number, which is listed
under kit details, contains the product identifier and revision. 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
EV76S68A
Hardware Revision History
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 15

6. Schematics
Label PCBA
Product number/revision Serial number
LABEL1: A09-0611
A11-0406
FE AB 26 E0
FF FF FF FF
9F 0C 4D 00
F3 57 E8 96
F4 64 98 02 35 07 92 86
62 87 5F 0E
FW1
SAME51Curiosity Nano
A12-1314 TESTDOC1
USB
Program / Debug Interface Mass Storage
IDE
Serial / CDC port
Data Visualizer
PB16 PB17USART3 TX
USART3 RX
DGI (Data Gateway Interface)
PA31Debug GPIO 0
Terminal
> Hello World!
CURIOSITY (E:)
SWD SWD Program Debug
Debug GPIO 1 PA30
CDC_UART
DBG0 DBG2
DBG1
DBG3
ID_SYS
VOFF
S1 SAME51_Curiosity_Nano_DEBUGGER_R3.SchDoc
DBG0 CDC_UART DBG1 DBG3 DBG2 VOFF ID_SYS
S2 SAME51_Curiosity_Nano_Target_MCU_R3.SchDoc
Debugger SAME51J20A
S3 SAME51_Curiosity_Nano_Rev_History_R3.SchDoc
*A09-3357: Product
*PCBA: A09-3360(Populated PCB w/label)
*A09-3358: ESD Bag w/Pop Board and label
A08-2988: (2) 1x28pin M 2.54 Hdrs A09-0614: Inner Assembly Label A08-1664: ESD Bag
A08-2804: Kit Box A08-2996: Outer Label
*A09-3306: ESD Bag w/Hdrs
A09-0608: ESD bag A09-0614: Inner Assembly Label
A12-1314: CNANO Test Instructions A11-0483: SAME51 CNANO Test A11-0406: nEDBG firmware A09-0611: Label PCBA Axx-xxxx: all electronic components A08-3073: bare PCB A12-1442: PCBA docs
A12-1442 PCBADOC1
$ >_
A11-0483 TEST1
A08-3073 SAME51-CNANO bare PCB PCB1
EV76S68A
Schematics
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 16

GNDVCC_TARGET
GND
VCC_TARGET
GND
G
N
D
G
N
D
32kHz Crystal
USER LED
VCC_TARGET
GND
USER BUTTON
1k
1
k
1
k
R201
YELLOW LED
SML-D12Y1WT86
21
D200
TS604VM1-035CR
1 3
42
SW200
GND GNDGND
GND GND
SAME51 (Target Device)
2.2uF C207
GND
DBG0
CDC_UART TX
RX
UART
CDC_TX
CDC_RX
DBG2
DBG1
DBG3
DBG2
DEBUGGER CONNECTIONS
DBG1
DBG3
DB
G0
C
D
C
_UAR
T
T
X
RX
UA
RT
DB
G1
DB
G3
DB
G2
DBG0
VOFF
ID_SYS
ID_SYS
VOFF
2
.2
uF
C
2
0
7
G
N
D
TARGET BULK
100k
R200
VCC_TARGET
1
0
0
k
1
0
0
k
R
2
0
0
V
C
C_
T
A
R
G
ET
RESET Pull
VBUS
J201 J203 J205 J206
J202 J204
NC
VCC_EDGE
VCC_EDGE
110R
R202
PB4_CON1_7 PB5_CON1_6 PB8_ADC2 PB9_ADC5 PA4_ADC6 PA5_CON2_4
PA20_CON2_2 PA21_CON2_3
PB22_CON3_2
PB23_CON3_7
PA27_CON2_5
PB31_CON3_1
PB30_SWO(DBG2)
PA31_SWDIO(DBG0)
PA30_SWCLK(DBG1)
GND
VCC_TARGET
4.7uF
C206
GND
1.8k R203
DNP 1.8k
R204
DNP
VCC_TARGET
RESETn
PROG/DEBUG Pull
47k
4
7k
R205
47k
4
7k
R206
DBG0 DBG1
VCC_TARGET
PB17_CDC-RX-S5P1 PA18_SPI-CS-S1P2 PB16_CDC-TX-S5P0 PA22_CON2_0(Tx-S3P0)
PB6_CON1_5 PB7_CON1_4
PA8_CON1_0(Tx-S0P0)
PA9_CON1_1(Rx-S0P1)
PA00_XIN32
PA10_ADC3
PA11_ADC4
PA12_I2C-SDA-S2P0 PA13_I2C-SCL-S2P1
CDC RX
3
CDC TX
4
DBG1
5
DBG2
6
0 TX
7
1 RX
8
2 SDA
9
3 SCL
10
4 MOSI
11
5 MISO
12
6 SCK
13
7 SS
14
GND
15
0 (TX)
16
1 (RX)
17
2
18
3
19
0
20
GND
24
DBG3
54
DBG0
53
GND
52
VCC
51
PWM 3
46
ADC 2
45
ADC 1
44
ADC 0
43
GND
42
4
38
4
34
GND
33
ADC 7
50
ADC 6
49
ADC 5
48
PWM 4
47
DEBUGGER
TARGET
ID
2
VOFF
55
1
21
2
22
3
23
0
25
1
26
2
27
3
28
4
29
5
30
6
31
7
32
5
35
6
36
7
37
5
39
6
40
7
41
RESERVED
1
VBUS
56
CNANO56-pin edge connector J200
PB12_TxD-S4P0
PB10_CON3_5
PB11_CON3_4
PB14_CON1_2
PB15_CON3_3
PB13_RxD-S4P1
PA14_LED
PA12_I2C-SDA-S2P0
PA13_I2C-SCL-S2P1
PA15_SW
PA01_XOUT32 PA2_ADC0 PA3_CON3_6 PA6_CON1_3 PA7_ADC7 VCC_TARGET
GND
PA17_SPI-SCK-S1P1 PA16_SPI-MOSI-S1P0
PB3_ADC1
PB2_CON3_0
PB1_CON2_7
PB0_CON2_6
PA8_CON1_0(Tx-S0P0) PA9_CON1_1(Rx-S0P1)
PB12_TxD-S4P0
PB10_CON3_5 PB11_CON3_4
PB14_CON1_2 PB15_CON3_3
PB13_RxD-S4P1 PA12_I2C-SDA-S2P0 PA13_I2C-SCL-S2P1
PB4_CON1_7 PB5_CON1_6
PB8_ADC2 PB9_ADC5 PA4_ADC6
PA5_CON2_4 PB6_CON1_5 PB7_CON1_4 PA3_CON3_6
PA6_CON1_3
PA7_ADC7
PA20_CON2_2 PA21_CON2_3
PA19_SPI-MISO-S1P3 PB17_CDC-RX-S5P1 PA18_SPI-CS-S1P2 PB16_CDC-TX-S5P0
PA23_CON2_1(Rx-S3P1) PA22_CON2_0(Tx-S3P0)
PA17_SPI-SCK-S1P1 PA16_SPI-MOSI-S1P0
PB22_CON3_2
PB23_CON3_7 PA27_CON2_5
PB31_CON3_1
PB30_SWO(DBG2)
PA31_SWDIO(DBG0)
PA30_SWCLK(DBG1)
RESETn
PB2_CON3_0
PB1_CON2_7 PB0_CON2_6
PA00_XIN32
PA01_XOUT32
PA14_LED
PA15_SW
VCC_TARGET
GND
PA23_CON2_1(Rx-S3P1) PA19_SPI-MISO-S1P3
PA25
100nF
C200
100nF C202
100nF C201
100nF C203
100nF
C204
100nF
C205
PA24
BLM15PD800SN1
L200
PA2_ADC0 PB3_ADC1 PA10_ADC3 PA11_ADC4
C209 C208
32.768kHz XC200
LQH3NPN100MJRL
L1
DNP
GND
10uH
VSW
VDDCORE
22pF 22pF
PA0/XIN32
1
PA1/XOUT32
2
PA2
3
PA3
4
PB4
5
PB5
6
GNDANA
7
VDDANA
8
PB6
9
PB7
10
PB8
11
PB9
12
PA4
13
PA5
14
PA6
15
PA7
16
PA8
17
PA9
18
PA10
19
PA11
20
VDDIO
21
GND
22
PB10
23
PB11
24
PB12
25
PB13
26
PB14
27
PB15
28
PA12
29
PA13
30
PA14/XIN
31
PA15/XOUT
32
GND 33
VDDIO 34
PA16 35
PA17 36 PA18 37
PA19 38 PB16 39
PB17 40 PA20 41 PA21 42 PA22 43
PA23 44
PA24 45
PA25 46
GND 47
VDDIO 48
PB22 49
PB23 50
PA27 51
RESET 52
VDDCORE 53
GND 54
VSW 55
VDDIO 56
SWCLK/PA30 57
SWDIO/PA31 58
PB30 59
PB31 60
PB0 61
PB1 62
PB2 63
PB3 64
SAME51J20A-MU-EFP
U200
(64 QFN)
Crystal datasheet: Ccrystal = 12.5pF max ESR = 70kOhm Accuracy ±20ppm SAME51 datasheet: Cxin = 3.1pF Cxout = 3.2pF Cl ≈1/( (1/3.1pF)+ (1/3.1pF) ) ≈1.57pF Maximum Load = 12.5pF Maximum ESR = 90kOhm Estimated Cpcb = 0.5pF Estimated load CLEXT = 2 (Cl-Cpara-Cpcb_Cshunt) C = 2 (12.5pF - 1.5745pF - 0.5pF-1.05pF) C = 18.75pF
N
OTE on UART/CDC:
RX/TX on the header denotes the input/output direction of the signal respective to it's source. CDC TX is output from the DEBUGGER. CDC RX is input to the DEBUGGER. TX is output from the TARGET device. RX is input to the TARGET device.
N
OTE on CDC:
TX and RX cross here.
EV76S68A
Schematics
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 17

DEBUGGER USB MICRO-B CONNECTOR
GND
USBD_P USBD_N
C107
C108
RX
TX
UART
CDC_UART
1k
R107
VCC_P3V3
SRST
STATUS_LED
SHIELD
VBUS
VCC_P3V3 GND
TP100
Testpoint Array
1 2
3 4 5 6
7 8
910
TCK TDO TMS Vsup TDI GND
TRST
SRST
VTref
GND
J102
GND
4.7uF C100
DBG0
DBG0
21
GREEN LED
SML-P12MTT86R
D100
VBUS
1
D-
2
D+
3
GND
5
SHIELD1
6
SHIELD2
7
ID
4
SHIELD3
8
SHIELD4
9
MU-MB0142AB2-269
J105 J105
PAD 33
PAD
PA00
1
PA01
2
PA02
3
PA03
4
GND
10 VDDANA
9
PA04
5
PA05
6
PA06
7
PA07
8
PA08
11
PA09
12
PA10
13
PA11
14
PA14
15
PA15
16
PA16 17
PA17 18 PA18 19
PA19 20
PA22 21
USB_SOF/PA23 22
USB_DM/PA24 23
USB_DP/PA25 24
PA27 25
RESETN 26
PA28 27
GND 28
VDDCORE 29
VDDIN 30
SWDCLK/PA30 31
SWDIO/PA31 32
SAMD21E18A-MUT U100
VOUT 1 VOUT 2
GND
3
EN
4
VIN
6
NC 5
EP
7
MIC5528-3.3YMTU101 VCC_P3V3
GND
USBD_P USBD_N
GND
C106
VCC_MCU_CORE
VCC_P3V3
VCC_P3V3
G
ND
4
.7
uF
C
1
0
0
VOUT
1
VOUT
2
G
N
D
3
EN
4
VIN
6
N
C
5
E
P
7
M
I
C
5
5
2
8
-
3
.
3
Y
M
T
U
1
0
1
V
C
C_
P
3
V
3
G
N
D
2.2uF C101
GND
74LVC1T45FW4-7
VCCA 1
VCCB
6
A3
GND 2
DIR
5
B
4
U103
VCC_P3V3 GND
74LVC1T45FW4-7
VCCA 1
VCCB
6
A3
GND 2
DIR
5
B
4
U104
VCC_P3V3 GND
74LVC1T45FW4-7
VCCA 1
VCCB
6
A3
GND 2
DIR
5
B
4
U105
VCC_P3V3 GND
GND
GND
GND
GND
74LVC1T45FW4-7
VCCA 1
VCCB
6
A3
GND 2
DIR
5
B
4
U107
VCC_P3V3 GND
DBG2
DBG3_CTRL
S1_0_TX S1_1_RX S0_2_TX DAC VTG_ADC RESERVED S0_3_CLK
DBG0_CTRL
CDC_TX_CTRL
BOOT
DEBUGGER POWER/STATUS LED
1
k
R
1
0
7
V
C
C_
P
3
V
3
2
1
G
REEN LE
D
S
ML-
P
12MTT
8
6
R
D
1
0
0
EN
1
BYP
6
VOUT 4
GND 2
VIN
3
NC/ADJ 5
GND
7
MIC5353U102
C102
GND
GND
47k
R101
27k
R104
GND
33k
R106
G
ND
EN
1
BYP
6
VOUT
4
G
N
D
2
VIN
3
NC
/
AD
J
5
G
N
D
7
M
I
C
53
5
3
U
1
0
2
C
1
0
2
G
N
D
G
N
D
4
7
k
4
7
k
R1
0
1
2
7
k
2
7
k
R1
0
4
G
N
D
3
3
k
R
1
0
6
2.2uF C103
GND
1k1
k
R108
J100
VCC_LEVELVCC_REGULATOR
74LVC1T45FW4-7
VCCA 1
VCCB
6
A3
GND 2
DIR
5
B
4
U106
VCC_P3V3 GND
DBG1
CDC_RX CDC_TX
DBG3
DBG1_CTRL
DEBUGGER REGULATOR
REG_ENABLE
REG_ENABLE
47k
4
7
k
4
7
k
R103
VCC_LEVEL VCC_LEVEL VCC_LEVEL VCC_LEVEL VCC_LEVEL
47k
4
7
k
4
7
k
R102
47k
4
7
k
4
7
k
R105
SWCLK
GND
47k
4
7
k
4
7
k
R100
GND
DBG2
S0_0_RX
DBG1_CTRL DBG0_CTRL
G
ND
DBG3 OPEN DRAIN
TARGET ADJUSTABLE REGULATOR
S
RS
T
V
C
C_P
3
V
3
G
N
D
T
e
s
t
p
o
in
t
A
t
r
r
r
r
a
y
1
2
3
4
5
6
7
8
9
1
0
T
C
K
TD
O
TM
S
V
s
u
p
u
TDI
G
ND
T
RS
T
S
RS
T
V
T
re
f
G
ND
J1
02
S
W
C
LK
DEBUGGER TESTPOINT
DBG2_CTRL
VOFF CDC_RX_CTRL
47k
4
7
k
4
7
k
R109
DBG1
CDC_TX_CTRL CDC_RX_CTRL
SWCLK
REG_ADJUST
DBG2_GPIO
DBG3_CTRL
DBG2_CTRL
Signal DBG0 DBG1 DBG2 DBG3
SWD
Interface
SWDAT SWCLK GPIO nRESET
DBG3
CDC TX CDC RX
UART RX UART TX TARGET
1k1
k
R110
VBUS_ADC
1
2 3
DMN65D8LFB Q101
VCC
3.3V
ID_SYS
VOFF
1k
R112
VCC_P3V3
I
D
_S
Y
S
1
k
1
k
R11
2
V
C
C_
P
3
V
3
VTG_ADC DAC MIC94163
VIN
B2 VOUT A1
VIN
A2
EN
C2 GND C1
VOUT B1
U108 U108
GND
ID_SYS VTG_EN
VTG_EN
VBUS_ADC
SWDIO
ID_SYS
TP101
GND
SWDIO
VOFF
47k
4
7
k
4
7
k
R111
GND
ID PIN
MC36213 F100
VCC_VBUS
VCC_VBUS
VCC_VBUS VCC_EDGE
J101
VCC_TARGET
10k
R113
GND
BLM15PD800SN1
L100
SRST
100nF
100nF
1uF
100nF
AVR programming connector for factory
p
rogramming of
DEBUGGER.
MIC5528: Vin: 2.5V to 5.5V Vout: Fixed 3.3V Imax: 500mA Dropout: 260mV @ 500mA
MIC5353: Vin: 2.6V to 6V Vout: 1.25V to 5.1V Imax: 500mA Dropout (typical): 50mV@150mA, 160mV @ 500mA Accuracy: 2% initial Thermal shutdown and current limit Maximum output voltage is limited by the input voltage and the dropout voltage in the regulator. (Vmax = Vin - dropout)
Adjustable output and limitations: - The DEBUGGER can adjust the output voltage of the regulator between 1.25V and 5.1V to the target. - The level shifters have a minimal voltage level of 1.65V and will limit the minimum operating voltage allowed for the target to still allow communication. - The output switch has a minimal volatege level of 1.70V and will limit the minimum voltage delivered to the target. - Firmware configuration will limit the voltage range to be within the the target specification. - Firmware feedback loop will adjust the output voltage accuracy to within 0.5%.
PTC Resettable fuse: Hold current: 500mA Trip current: 1000mA
J100: Cut-strap used for full separation of target power from the level shifters and on-board regulators. - For current measurements using an external power supply, this strap could be cut for more accurate measurements. Leakage back through the switch is in the micro ampere range. J101: This is footprint for a 1x2 100mil pitch pin-header that can be used for easy current measurement to the target microcontroller and the LED / Button. To use the footprint: - Cut the track between the holes, and mount a pin-header
EV76S68A
Schematics
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 18

7. Revision History
Rev. A (08/2020)
This is the initial released version of this document.
EV76S68A
Revision History
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 19

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Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection
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Legal Notice
Information contained in this publication regarding device applications and the like is provided only for your
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EV76S68A
© 2020 Microchip Technology Inc. User Guide DS70005432A-page 20