Microchip D21G17D User Manual

SAM D21G17D

SAM D21G17D Curiosity Nano Evaluation Kit User's Guide

Preface

The SAMD21G17D Curiosity Nano Evaluation Kit (DM320119) is a hardware platform to evaluate the SAMD21G17D
microcontroller (MCU), and it is supported by the MPLAB® X Integrated Development Environment (IDE). The
evaluation kit provides an easy access to the features of the SAMD21G17D to integrate the device into a custom
design. The Curiosity Nano series of evaluation kits include an On-Board Nano Debugger, hence no external tools
are necessary to program the SAMD21G17D device. The SAMD21G17D Curiosity Nano Evaluation Kit is shown
below.

© 2019 Microchip Technology Inc.

DS70005409A-page 1

SAM D21G17D

Table of Contents

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

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

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

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

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

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

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

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

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

3.4. Disconnecting the On-Board Nano Debugger..............................................................................9

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

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

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

4.2. Peripherals................................................................................................................................. 11

4.3. On-Board Nano Debugger Implementation................................................................................12

5. Hardware Revision History....................................................................................................................13

5.1. Identifying Product ID and Revision........................................................................................... 13

6. Schematics............................................................................................................................................14

7. Document Revision History...................................................................................................................17

The Microchip Website.................................................................................................................................18

Product Change Notification Service............................................................................................................18

Customer Support........................................................................................................................................ 18

Product Identification System.......................................................................................................................19

Microchip Devices Code Protection Feature................................................................................................ 19

Legal Notice................................................................................................................................................. 19

Trademarks.................................................................................................................................................. 20

Quality Management System....................................................................................................................... 20

Worldwide Sales and Service.......................................................................................................................21

© 2019 Microchip Technology Inc.

DS70005409A-page 2

1. Introduction

Micro‐USB
Connector

Power/Status

LED

Nano

Debugger

ATS AMD21 G17D

MCU

UserLED

(LED0)

UserSwitch

(SW0)

32.768kHz
Crystal

(DNP)

Kit Overview

The SAMD21G17D Curiosity Nano evaluation kit is a hardware platform used to evaluate the SAMD21G17D.

Figure 1-1. Kit Overview

SAM D21G17D

Introduction

1.1 Features

The following are features of the SAMD21G17D Curiosity Nano evaluation kit:

• SAMD21G17D microcontroller

• One yellow user LED

• One mechanical user switch

• On-Board Nano Debugger
– Board identification in MPLAB X IDE
– One green power/status LED
– Programing and debugging
– Virtual COM port (CDC)
– One logic analyzer (DGI GPIO)

• USB powered

• Adjustable target voltage
– MIC5353 LDO regulator controlled by the On-Board Nano Debugger
– 1.7V to 3.6V output voltage
– 500 mA maximum output current (limited by ambient temperature and output voltage)

© 2019 Microchip Technology Inc.

DS70005409A-page 3

2. Getting Started

2.1 Curiosity Nano Quick Start

Follow these steps to explore 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 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.

After 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 populate relevant information like data sheets and kit
documentation in the kit window. The SAMD21G17D device is programmed and debugged by the On-Board Nano
Debugger, hence no external programmer or debugger tool is required.

SAM D21G17D

Getting Started

© 2019 Microchip Technology Inc.

DS70005409A-page 4

3. Curiosity Nano

Curiosity Nano is an evaluation platform that provides a set of small boards with access to most of the microcontroller
I/Os. 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 codes. 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 Nano Debugger

The SAMD21G17D Curiosity Nano contains an On-Board Nano Debugger for programming and debugging. The On­Board Nano Debugger is a complex USB device consists of several interfaces, such as a debugger, a mass storage
device, a data gateway, and a Virtual COM port (CDC). Together with MPLAB X IDE, the On-Board Nano Debugger
interface can program and debug the SAMD21G17D. An DGI is available for use with the logic analyzer channels for
code instrumentation to visualize program flow. DGI GPIOs can be graphed using the Data Visualizer. The Virtual
COM port is connected to a UART on the SAMD21G17D and it provides an easy way to communicate with the target
application through terminal software. The On-Board Nano Debugger controls one Power/Status LED (marked PS)
on the SAMD21G17D Curiosity Nano board. The following table describes how the LED is controlled in different
operation modes.

Table 3-1. On-Board Nano Debugger LED Control

Operation Mode Status LED

SAM D21G17D

Curiosity Nano

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 Nano Debugger is either in Sleep mode or Power-Down mode. This

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 complex 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.

Note:  On the older version of Windows systems a USB driver is required for CDC. This driver is included in Atmel
Studio and 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#.

will occur only if the kit is externally powered

®

3.1.1.2 Limitations

Not all UART features are implemented in the debugger CDC, and the constraints are outlined below:

• 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.

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

• Parity: Can be odd, even, or none.

• Hardware flow control: Not supported.

© 2019 Microchip Technology Inc.

DS70005409A-page 5

• 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 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 hardware on the debugger. Asserting 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. Deasserting 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

When the CDC Override mode is in normal operation, the On-Board Nano 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
recently 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 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, because the debugger buffers frames, not bytes. A maximum of 4 x 64­byte frames can be active at any time, the debugger will throttle the incoming frames accordingly. Sending full 64­byte 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-of­frame 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
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.

Note:  Mass storage disk is not supported during this release.

SAM D21G17D

Curiosity Nano

3.1.2 Mass Storage Disk

Not supported at this time.

3.2 Curiosity Nano Standard Pinout

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

© 2019 Microchip Technology Inc.

DS70005409A-page 6

...........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

SAM D21G17D

Curiosity Nano

3.3 Power Supply

The evaluation 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-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 SAMD21G17D Curiosity Nano.

Figure 3-2. Power Supply Block Diagram

© 2019 Microchip Technology Inc.

DS70005409A-page 7

3.3.1 Target Voltage Regulator

WARNING

WARNING

The target voltage regulator is a MIC5353 variable output LDO. The On-Board Nano Debugger can adjust the voltage
output that is supplied to the kit target section by manipulating the MIC5353's feedback voltage. The hardware
implementation is limited to an approximate voltage range from 1.7V-5.1V. Additional output voltage limits are
configured in the debugger firmware to ensure that the output voltage never exceeds the hardware limits of the
SAMD21G17D microcontroller. The voltage limits configured in the On-Board Nano Debugger on the SAMD21G17D
Curiosity Nano are 1.7V-3.6 V. The target voltage is set to 3.3V in production and can be changed through Atmel
Studio. Any change to the target voltage done in Atmel Studio 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

SAM D21G17D

Curiosity Nano

3.3.2 External Supply

The SAMD21G17D Curiosity Nano evaluation kit 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 Nano Debugger
firmware disables the target regulator and it is safe to apply an external voltage to the VTG pin.

Programming, debugging, and data streaming are still possible while using the 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.

© 2019 Microchip Technology Inc.

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

Absolute maximum external voltage is 5.5V for the level shifters on board. Applying a higher voltage may
cause permanent damage to the kit.

DS70005409A-page 8

3.4 Disconnecting the On-Board Nano Debugger

The following block diagram shows connections between the debugger and the SAMD21G17D microcontroller. The
round boxes represent connections to the board edge on the SAMD21G17D Curiosity Nano. The signal names are
shown in Figure 3-1 and printed in silkscreen on the bottom side of the board.

Figure 3-4. On-Board Nano Debugger Connections

SAM D21G17D

Curiosity Nano

By cutting the GPIO straps with a sharp tool, as shown in the following figure, all I/Os connected between the
debugger and the SAMD21G17D can be disconnected. To disconnect the target regulator, cut the VTG strap.

Note: 

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 Nano
Debugger section.

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

© 2019 Microchip Technology Inc.

DS70005409A-page 9

3.5 Current Measurement

The power to the SAMD21G17D 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
SAMD21G17D 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.

SAM D21G17D

Curiosity Nano

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

Disconnect the On-Board Nano Debugger and level shifters as described in Disconnecting the On-Board

Debugger to prevent any current leakage.

© 2019 Microchip Technology Inc.

DS70005409A-page 10

4. Hardware

USB

Debugger(nEDBG)

SAMD21

UserButton&

UserLED

Edgepinout

SAMD21

4.1 Connectors

4.1.1 SAMD21G17D Curiosity Nano Pinout

All of the SAMD21G17D I/O pins are accessible at the edge connectors on the SAMD21G17D Curiosity Nano, except
the button and LED (PB10, PB11). The following figure shows the evaluation kit pinout. RA30 and RA31 are only
available at the edge connector in the debugger section as long as the cut straps on the bottom are not cut.

Figure 4-1. 

SAM D21G17D

Hardware

4.2 Peripherals

4.2.1 LED

One yellow user LED is available on the SAMD21G17D Curiosity Nano evaluation kit which can be controlled either
with a GPIO or PWM. The LED can be activated by driving the connected I/O line to the GND.

Table 4-1. LED Connection

SAMD21G17D Function Shared Functionality

PB10 Yellow LED0 None

4.2.2 Mechanical Switch

The SAMD21G17D Curiosity Nano has one mechanical switch, a generic user configurable switch. When this switch
is pressed, it will drive the I/O line to ground (GND).

Note:  No pull-up resistor is connected to the generic user switch. Ensure that the internal pull-up is enabled in the
SAMD21G17D to use the switch.

Table 4-2. Mechanical Switch

SAMD21G17D Function Shared Functionality

PB11 User switch SW0 DBG2 and Edge connector

© 2019 Microchip Technology Inc.

DS70005409A-page 11

4.2.3 Crystal

The SAMD21G17D Curiosity Nano board has the option for a 32.768 kHz crystal, and by default this crystal is not
connected to the SAMD21G17D, as GPIOs are routed out to the edge connector. To use the crystal, some hardware
modifications are required. The two I/O lines routed to the edge connector must be disconnected to reduce the
chance of contention to the crystal, and to remove excessive capacitance on the lines.

Table 4-3. Crystal Connections

SAMD21G17D pin Function Shared Functionality

PA00 XIN32 Edge connector

PA01 XOUT32 Edge connector

4.3 On-Board Nano Debugger Implementation

The SAMD21G17D Curiosity Nano features an On-Board Nano Debugger that can be used to program and debug
the SAMD21G17D using a Serial wire debug (SWD). The On-Board Nano 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 Nano Debugger for
programming and debugging. Data Visualizer can be used as a front-end for the CDC and DGI GPIO.

4.3.1 On-Board Nano Debugger Connections

The following table provides the connection details 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 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 Nano Debugger, see Curiosity Nano.

Table 4-4. Connection Details between the Target and Debugger Section

SAM D21G17D

Hardware

SAMD21G17D pin Debugger pin Function Shared Functionality

PB03 CDC TX UART TX (SAMD21G17D RX line) Edge Connector

PB02 CDC RX UART RX (SAMD21G17D TX line Edge Connector

PA31 DBG0 SWDATA Edge Connector

PA30 DBG1 SWCLK Edge Connector

PB11 DBG2 GPIO Edge Connector and SW0

nRESET DBG3 nRESET Edge Connector

VCC_TARGET VCC_LEVEL 1.7V-3.6V supply voltage Edge Connector

GND GND Common ground Edge Connector

© 2019 Microchip Technology Inc.

DS70005409A-page 12

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 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, contain the product identifier and revision. The same information can be found on the sticker on the
bottom 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

SAM D21G17D

Hardware Revision History

© 2019 Microchip Technology Inc.

DS70005409A-page 13

6. Schematics

CDC_UART

DBG0

DBG2

DBG1

DBG3

VOFF

ID_SYS

U_SAMD21_Curiosity_Nano_Debugger R3
SAMD21_Curiosity_Nano_Debugger R3.SchDoc

DBG0

CDC_UART

DBG1

DBG3

DBG2

VOFF

ID_SYS

U_SAMD21_Curiosity_Nano_Target_MCU R3
SAMD21_Curiosity_Nano_Target_MCU R3.SchDoc

Figure 6-1. Target Microcontroller (SAMD21G17D)

SAM D21G17D

Schematics

© 2019 Microchip Technology Inc.

DS70005409A-page 14

GNDVCC_TARGET

100n

C201

32.768kHz
Kyocera Corporation
ST3215SB32768C0HPWBB

XC200

DNP

C203
10pF

DNP

13pF

C204

DNP

GND

GND

VCC_TARGET

100n

C202

VCC_TARGET

100n

C207

GND

32.768kHz
Kyocera Corporatio

n

S

T3215SB32768C0HPWB

B

XC20

0

DNPNDNP

DNP

C203

10p

F

D

13p

F

C204

DN

GND

GND

32kHz Crystal

USER LED

VCC_TARGET

nRESET

GND

USER BUTTON

1k1

R202

YELLOW LED

SML-D12Y1WT86

21

D200

TS604VM1-035CR

1 3

42

SW0

GND
VCC_EDGE

GNDGND

GND GND

J203
J205

J201 J202

J204

J206

J209

BLM18PG471SN1

L200

SAMD21

2.2uF

C205

VCC_EDGE

GND

DBG0

CDC_UART

TX

RX

UART

CDC_TX

CDC_RX

DBG2

DBG1

DBG3

DBG2

DEBUGGER CONNECTIONS

DBG1

DBG3

DBG0

CDC_

UART

_

T

RX

U

ART

D

BG1

DBG3

DBG2

DBG0

VOFF

ID_SYS

ID_SYS

VOFF

2.2

uF

C205

V

CC_EDGE

GND

TARGET BULK

PROG/DEBUG Pull

47k47k

R204

47k

4

7k

R205

DBG0
DBG1

100k

R200

VCC_TARGET

1

R

V

CC_TARGET

nRESET Pull

VBUS

PA10_UART2_TX

PA09_UART0_RX

PA11_UART2_RX

PA08_UART0_TX

PA13_I2C4_SCL

PA12_I2C4_SDA

PA17_SPI_SCK
PA16_SPI_MOSI

PA14

PA15

PA00_XIN32
PA01_XOUT32

PA23

PA24

PA25

PA30_SWCLK

PA18_SPI_SS

PA19_SPI_MISO

PA07_ADC7

PA06_ADC6

PA05_ADC5

PA04_PWM4

PB09_PWM3

PB08_ADC2

PA03_ADC1

PA02_ADC0

PA21_UART3_RX
PA20_UART3_TX

PB23

PA27

PA28

PB10_LED

PB11_BUTTON

PA31_SWDIO

GND

VCC_TARGET

100n

C206

1uC208

GND

(Target Device)

1.8k

R206

DNP 1.8k

R207

DNP

VCC_TARGET

VCC_TARGET

PA00_XIN32

PA01_XOUT32

PB10_LED

PB11_BUTTON

PA30_SWCLK
PB11_BUTTON

PA31_SWDIO

nRESET

PA08_UART0_TX
PA09_UART0_RX
PA12_I2C4_SDA
PA13_I2C4_SCL
PA16_SPI_MOSI
PA19_SPI_MISO
PA17_SPI_SCK
PA18_SPI_SS PA02_ADC0

PA03_ADC1

PB08_ADC2

PB09_PWM3

PA04_PWM4

PA05_ADC5

PA06_ADC6

PA07_ADC7

PA20_UART3_TX
PA21_UART3_RX

PA00_XIN32
PA01_XOUT32 PA14

PA15

PA24

PA25

PA23

PB23

PA27

PA28

PA10_UART2_TX
PA11_UART2_RX

PA12_I2C4_SDA

PA13_I2C4_SCL

110R

R203

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

46

DBG0

45

GND

44

VCC

43

PWM 3

38

ADC 2

37

ADC 1

36

ADC 0

35

GND

34

4

30

4

26

GND

25

ADC 7

42

ADC 6

41

ADC 5

40

PWM 4

39

DEBUGGER

TARGET

ID2VOFF

47

1

21

2

22

3

23

5

27

6

28

7

29

5

31

6

32

7

33

RESERVED1VBUS

48

CNANO48-pin edge connector

J200

PA00

1

PA01

2

PA02

3

PA03

4

GNDANA

5

VDDANA

6

PB08

7

PB09

8

PA04

9

PA05

10

PA06

11

PA07

12

PA0813PA0914PA1015PA1116VDDIO17GND18PB1019PB1120PA1221PA1322PA1423PA15

24

PA16

25

PA17

26

PA18

27

PA19

28

PA20

29

PA21

30

PA22

31

USB_SOF/PA23

32

USB_DM/PA24

33

USB_DP/PA25

34

GND

35

VDDIO

36

PB2237PB2338PA27

39

RESETN

40

PA28

41

GND

42

VDDCORE

43

VDDIN

44

SWDCLK/PA30

45

SWDIO/PA31

46

PB0247PB03

48

SAMD21G17D-AUT

U200

PA22_CDC5_TX
PB22_CDC5_RX

PB03

PB02

PA22_CDC5_TX

PB22_CDC5_RX

PB03

PB02

Crystal datasheet:
Ccrystal = 7pF
max ESR = 70kOhm
Accuracy ±20ppm

SAMD21 datasheet:
Cxin = 5.5pF
Cxout = 5.5pF
Cl ≈ 1/( (1/5.5pF)+ (1/5.5pF) ) ≈ 2.75pF
Maximum Load = 12.5pF
Maximum ESR = 80kOhm

Estimated Cpcb = 0.5pF

Estimated load
C = 2 (Ccrystal- Cpara - Cpcb)
C = 2 (7pF - 2.75pF - 0.5pF)
C = 7.5pF

Selected in design after verification
C= 10/13pF

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.

© 2019 Microchip Technology Inc.

Figure 6-2. Debuggerrotatethispage90

DS70005409A-page 15

SAM D21G17D

Schematics

100n

C107

100n

C108

RX

TX

UART

CDC_UART

SRST

STATUS_LED

VCC_P3V3

GND

TP100

Testpoint Array

1 2
3 4
5 6
7 8
9 10

TCK
TDO
TMS
Vsup
TDI GND

TRST

SRST

VTref

GND

J102

DBG0

DBG0

PAD

33

PAD

PA00

1

PA01

2

PA02

3

PA03

4

GND10VDDANA

9

PA04

5

PA05

6

PA06

7

PA07

8

PA0811PA0912PA1013PA1114PA1415PA15

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

USBD_P
USBD_N

GND

1u

C106

VCC_MCU_CORE

VCC_P3V3

VCC_P3V3

74LVC1T45FW4-7

VCCA

1

VCCB

6

A

3

GND

2

DIR

5

B

4

U103

VCC_P3V3
GND

74LVC1T45FW4-7

VCCA

1

VCCB

6

A

3

GND

2

DIR

5

B

4

U104

VCC_P3V3
GND

74LVC1T45FW4-7

VCCA

1

VCCB

6

A

3

GND

2

DIR

5

B

4

U105

VCC_P3V3
GND

GND

GND

GND

GND

74LVC1T45FW4-7

VCCA

1

VCCB

6

A

3

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

EN

1

BYP

6

VOUT

4

GND

2

VIN

3

NC/ADJ

5

GND

7

MIC5353U102

VCC_VBUS

100n

C102

GND

GND

47k

R101

27k

R104

GND

33k

R106

G

ND

EN

6

V

OUT

4

GND

VIN

3

NC/ADJ

5

GND

MIC535

3

U102

V

CC_VBUS

1

00n

C102

G

ND

GND

R1

1

1

G

ND

33

k

R1

06

2.2uF

C103

GND

1k

R108

J100

VCC_LEVELVCC_REGULATOR

74LVC1T45FW4-7

VCCA

1

VCCB

6

A

3

GND

2

DIR

5

B

4

U106

VCC_P3V3
GND

DBG1

CDC_RX

CDC_TX

DBG3

DBG1_CTRL

REG_ENABLE

REG_ENABLE

47k

R103

VCC_LEVEL

VCC_LEVEL

VCC_LEVEL

VCC_LEVEL

VCC_LEVEL

47k

R102

47k

R105

SWCLK

GND

47k

R100

GND

DBG2

S0_0_RX

DBG1_CTRL

DBG0_CTRL

GND

DBG3 OPEN DRAIN

TARGET ADJUSTABLE REGULATOR

SRST

SRS

T

VCC_

P3V3

G

ND

Testpoint Arra

y

356

7

8910

TCK
TD

O

TM

S

V

sup

TDIGND

TRST

SRS

T

V

Tre

f

GNDJ102

SWC

LK

DEBUGGER TESTPOINT

DBG2_CTRL

VOFF
CDC_RX_CTRL

47k

R109

DBG1

CDC_TX_CTRL

CDC_RX_CTRL

SWCLK

REG_ADJUST

DBG2_GPIO

DBG3_CTRL

DBG2_CTRL

nRESET

Signal

DBG0

DBG1

DBG2

DBG3

SWD

Interface

SWDAT

SWCLK

GPIO

DBG3

CDC TX

CDC RX

UART RX

UART TX

TARGET

1k

1k

R110

VBUS_ADC

1

2 3

DMN65D8LFB

Q101

VCC 3.3V

VOFF

VTG_ADC
DAC

MIC94163

VIN

B2

VOUT

A1

VIN

A2

EN

C2

GND

C1

VOUT

B1

U108

GND

ID_SYS

VTG_EN

VTG_EN

VBUS_ADC

SWDIO

TP101

GND

SWDIO

VOFF

47k

R111

GND

DEBUGGER USB MICRO-B CONNECTOR

GND

USBD_P

USBD_N

1k

R107

VCC_P3V3

SHIELD

VBUS

GND

4.7uF

C100

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

VOUT

1

VOUT

2

GND

3

EN

4

VIN

6

NC

5

EP

7

MIC5528-3.3YMTU101VCC_VBUS VCC_P3V3

GND

G

ND

4

.7u

F

C100

V

OUT

V

OUT

N

6

N

C

5

MIC5528-3.3YMT

U101

V

CC_VBUS

V

CC_P3V3

G

ND

2.2uF

C101

GND

DEBUGGER POWER/STATUS LED

1k

R10

7

V

CC_P3V3

G

REEN LE

D

S

ML-P12MTT86R

D1

00

DEBUGGER REGULATOR

ID_SYS

1k

R112

VCC_P3V3

ID_

SYS

_

1

R11

V

CC_P3V3

ID_SYS

ID PIN

MC36213

F100

VCC_VBUS

VCC_EDGE

J101

VCC_TARGET

GND

10k

R113

BLM15PD800SN1

L100

Programming connector
for factory programming o

f

Debugger.

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)

J100:

- Cut-strap used for full separation of target power from the level shifters and on-board regulators.

- For current measurements using the on-board power supply, this strap must be cut and an
ammeter connected across.

- 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.

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%.

MIC5528:
Vin: 2.5V to 5.5V
Vout: Fixed 3.3V
Imax: 500mA
Dro

p

out: 260mV @ 500mA

PTC Resettable fuse:
Hold current: 500mA
Tri

p

current: 1000mA

© 2019 Microchip Technology Inc.

Figure 6-3. Debuggerrotatethispage90

DS70005409A-page 16

SAM D21G17D

Schematics

7. Document Revision History

Rev A - 12/2019

This is the initial released version of this document.

SAM D21G17D

Document Revision History

© 2019 Microchip Technology Inc.

DS70005409A-page 17

SAM D21G17D

The Microchip Website

Microchip provides online support via our website at http://www.microchip.com/. This website is used to make files
and information easily available to customers. Some of the content available includes:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s

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• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online

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To register, go to http://www.microchip.com/pcn and follow the registration instructions.

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Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Embedded Solutions Engineer (ESE)

• Technical Support

Customers should contact their distributor, representative or ESE for support. Local sales offices are also available to
help customers. A listing of sales offices and locations is included in this document.

Technical support is available through the website at: http://www.microchip.com/support

© 2019 Microchip Technology Inc.

DS70005409A-page 18

PART NO.

–X

/XX

Package

[X]

(1)

Tape

and Reel

Device Temperature

Range

SAM D21G17D

Product Identification System

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

Device: Device A, Feature A, (Package A) Device B, Feature B, (Package B)

Tape & Reel Option: Blank = Tube

T = Tape & Reel

Temperature Range: I = -40°C to +85°C (Industrial)

E = -40°C to +125°C (Extended)

Package: AA = Package AA

BB = Package BB

Examples:

• MCPXXXXXAT-E/AA: Tape and Reel, Extended temperature, XAA package

• MCPXXXXXBT-E/BB: Tape and Reel Extended temperature, XBB package

Note: 

1. Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering
purposes and is not printed on the device package. Check with your Microchip Sales Office for package
availability with the Tape and Reel option.

2. Small form-factor packaging options may be available. Please check http://www.microchip.com/packaging for
small-form factor package availability, or contact your local Sales Office.

Microchip Devices Code Protection Feature

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today,

when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these

methods, to our knowledge, require using the Microchip products in a manner outside the operating
specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of
intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code

protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection
features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital
Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you
may have a right to sue for relief under that Act.

Legal Notice

Information contained in this publication regarding device applications and the like is provided only for your
convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with
your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER

© 2019 Microchip Technology Inc.

DS70005409A-page 19

SAM D21G17D

EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip
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use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless
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Trademarks

The Microchip name and logo, the Microchip logo, Adaptec, AnyRate, AVR, AVR logo, AVR Freaks, BesTime,
BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, HELDO, IGLOO, JukeBlox,
KeeLoq, Kleer, LANCheck, LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo, MOST,
MOST logo, MPLAB, OptoLyzer, PackeTime, PIC, picoPower, PICSTART, PIC32 logo, PolarFire, Prochip Designer,
QTouch, SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon,
TempTrackr, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.

APT, ClockWorks, The Embedded Control Solutions Company, EtherSynch, FlashTec, Hyper Speed Control,
HyperLight Load, IntelliMOS, Libero, motorBench, mTouch, Powermite 3, Precision Edge, ProASIC, ProASIC Plus,
ProASIC Plus logo, Quiet-Wire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub, TimePictra, TimeProvider,
Vite, WinPath, and ZL are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BlueSky, BodyCom,
CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM,
dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP,
INICnet, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, memBrain, Mindi, MiWi, MPASM, MPF,
MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM,
PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad
I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense,
ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A.
and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of
Microchip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.

All other trademarks mentioned herein are property of their respective companies.

©

2019, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.

ISBN: 978-1-5224-5413-7

Quality Management System

For information regarding Microchip’s Quality Management Systems, please visit http://www.microchip.com/quality.

© 2019 Microchip Technology Inc.

DS70005409A-page 20

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DS70005409A-page 21