Atmel SAM C21 Xplained Pro [USER GUIDE]

Atmel SAM C21 Xplained Pro [USER GUIDE]
SMART ARM-based MCUs
SAM C21 Xplained Pro
USER GUIDE
Preface
®
The Atmel SAM C21 Xplained Pro evaluation kit is a hardware platform to
evaluate the Atmel ATSAMC21J18A microcontroller.
Supported by the Atmel Studio integrated development platform, the kit
provides easy access to the features of the ATSAMC21J18A and explains
how to integrate the device in a custom design.
The Xplained Pro MCU series evaluation kits include an on-board
Embedded Debugger, and no external tools are necessary to program or
debug the ATSAMC21J18A.
The Xplained Pro extension series evaluation kits offers additional
peripherals to extend the features of the board and ease the development of
custom designs.
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................ 4
1.1.
1.2.
Features....................................................................................................................................... 4
Kit Overview................................................................................................................................. 4
2. Getting Started...........................................................................................................6
2.1.
2.2.
Xplained Pro Quick Start.............................................................................................................. 6
Design Documentation and Relevant Links................................................................................. 6
3. Xplained Pro.............................................................................................................. 7
3.1.
3.2.
3.3.
3.4.
Embedded Debugger................................................................................................................... 7
Hardware Identification System....................................................................................................8
Power Sources............................................................................................................................. 8
Xplained Pro Headers and Connectors........................................................................................9
3.4.1.
Xplained Pro Standard Extension Header..................................................................... 9
3.4.2.
Xplained Pro Power Header........................................................................................ 10
4. Hardware Users Guide............................................................................................ 11
4.1.
4.2.
4.3.
Power Distribution.......................................................................................................................11
Connectors................................................................................................................................. 12
4.2.1.
Xplained Pro Extension Headers.................................................................................13
4.2.2.
Arduino Connectors..................................................................................................... 15
4.2.3.
VCC Selection Header.................................................................................................17
4.2.4.
VREF Header.............................................................................................................. 18
4.2.5.
DAC Header................................................................................................................ 18
4.2.6.
Current Measurement Header..................................................................................... 18
4.2.7.
Cortex Debug Connector............................................................................................. 18
Peripherals................................................................................................................................. 19
4.3.1.
LED..............................................................................................................................19
4.3.2.
4.3.3.
4.3.4.
4.3.5.
4.3.6.
4.4.
4.5.
Mechanical Buttons..................................................................................................... 19
Crystals........................................................................................................................19
CAN............................................................................................................................. 20
LIN............................................................................................................................... 20
QTouch Button............................................................................................................. 21
4.3.7.
Crypto Footprints......................................................................................................... 21
Kit Modifications......................................................................................................................... 22
Embedded Debugger Implementation........................................................................................29
4.5.1.
Serial Wire Debug........................................................................................................30
4.5.2.
Virtual COM Port..........................................................................................................30
4.5.3.
Atmel Data Gateway Interface.....................................................................................30
5. Appendix..................................................................................................................32
5.1.
5.2.
Getting Started with IAR.............................................................................................................32
Connecting a SAM-ICE to an Xplained Pro Board..................................................................... 35
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6. Hardware Revision History and Known Issues........................................................37
6.1.
6.2.
6.3.
6.4.
Identifying Product ID and Revision........................................................................................... 37
Revision 5...................................................................................................................................37
Revision 3...................................................................................................................................42
Revision 2...................................................................................................................................42
6.4.1.
The QTouch Button PAD is not Connected..................................................................42
6.4.2.
Kit Does Not Work with 3.3V Target Voltage Selected.................................................42
7. Document Revision History..................................................................................... 43
8. Evaluation Board/kit Important Notice..................................................................... 44
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1.
Introduction
1.1.
Features
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1.2.
ATSAMC21J18A microcontroller
Embedded Debugger
– USB interface
– Auto-ID for board identification in Atmel Studio
– One yellow status LED
– One green board power LED
– Symbolic debug of complex data types icluding scope information
– Programming and debugging of on board SAM C21 through Serial Wire Debug (SWD)
– Data Gateway Interface: SPI, I2C, four GPIOs
– Virtual COM port (CDC)
– Control of on-board power switch to protect connected extensions against high voltage
Digital I/O
– Two mechanical buttons (user and reset button)
®
– One QTouch button
– One yellow user LED
– Three Xplained Pro extension headers
Two selectable target voltages
– 3.3V
– 5.0V
Level converters between target section and EDBG section
32.768kHz crystal mounted
16MHz crystal footprint (not mounted)
CAN transceiver
LIN transceiver
– Wake-up button
– Master node pull-up enable
– Alternate LIN power jumper
DAC output connector
Analog voltage reference connector with filtered power supply
– SDADC VREF
– ADC/DAC VREF
Supported with application examples in Atmel Software Framework
Kit Overview
The Atmel SAM C21 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel
ATSAMC21J18A.
The kit offers a set of features that enables the ATSAMC21J18A user to get started with the SAM C
peripherals right away and to get an understanding of how to integrate the device in their own design.
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Figure 1-1 SAM C21 Xplained Pro Evaluation Kit Overview
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2.
Getting Started
2.1.
Xplained Pro Quick Start
Three steps to start exploring the Atmel Xplained Pro platform:
1. Download Atmel Studio.
2. Launch Atmel Studio.
3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the DEBUG USB
port on the kit.
When the Xplained Pro MCU kit is connected to your computer for the first time, the operating system will
®
perform a driver software installation. The driver file supports both 32- and 64-bit versions of Microsoft
®
®
Windows XP, Windows Vista , Windows 7, and Windows 8.
Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will auto
detect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will present
relevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also has
the option to launch Atmel Software Framework (ASF) example applications for the kit. The SAM C21
device is programmed and debugged by the on-board Embedded Debugger and therefore no external
programmer or debugger tool is needed.
2.2.
Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for SAM C21 Xplained Pro:
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Xplained Pro products - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluation
kits for Atmel microcontrollers and other Atmel products. It consists of a series of low-cost MCU
boards for evaluation and demonstration of features and capabilities of different MCU families.
Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
Atmel sample store - Atmel sample store where you can order samples of devices.
EDBG User Guide - User guide containing more information about the on-board Embedded
Debugger.
®
®
IAR Embedded Workbench for ARM - This is a commercial C/C++ compiler that is available for
ARM. There is a 30 day evaluation version as well as a code size limited kick-start version available
from their website. The code size limit is 16KB for devices with M0, M0+, and M1 cores and 32KB
for devices with other cores.
®
Atmel QTouch Library PTC - QTouch Library for Atmel AVR and ARM-based microcontrollers.
Atmel QTouch Composer - Tool for developing capacitive buttons, sliders, and wheels
applications.
Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizing
data. Data Visualizer can receive data from various sources such as the Embedded Debugger Data
Gateway Interface found on Xplained Pro boards and COM ports.
Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,
3D plots, layer plots etc.
Hardware Users Guide in PDF format - PDF version of this User Guide.
SAM C21 Xplained Pro in the Atmel store - Atmel Store link.
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3.
Xplained Pro
Xplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. The
platform consists of a series of Microcontroller (MCU) boards and extension boards which are integrated
with Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support data
streaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards
which are connected through a set of standardized headers and connectors. Each extension board has
an identification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.
This information is used to present relevant user guides, application notes, datasheets, and example
code through Atmel Studio.
3.1.
Embedded Debugger
The SAM C21 Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board debugging.
The EDBG is a composite USB device of three interfaces; a debugger, Virtual COM Port, and a Data
Gateway Interface (DGI).
Together with Atmel Studio, the EDBG debugger interface can program and debug the ATSAMC21J18A.
On SAM C21 Xplained Pro, the SWD interface is connected between the EDBG and the
ATSAMC21J18A.
The Virtual COM Port is connected to a UART on the ATSAMC21J18A and provides an easy way to
communicate with the target application through terminal software. It offers variable baud rate, parity, and
stop bit settings. Note that the settings on the ATSAMC21J18A must match the settings given in the
terminal software.
Info: If not set automatically, data terminal ready (DTR) must be set in the terminal software.
The DGI consists of several physical interfaces for communication with the host computer.
Communication over the interfaces is bidirectional. It can be used to send events and values from the
ATSAMC21J18A or as a generic printf-style data channel. Traffic over the interfaces can be timestamped
on the EDBG for more accurate tracing of events. Note that timestamping imposes an overhead that
reduces maximal throughput. Atmel Data Visualizer is used to send and receive data through DGI.
The EDBG controls two LEDs on SAM C21 Xplained Pro; a power LED and a status LED. Table 3-1 EDBG LED Control on page 7 shows how the LEDs are controlled in different operation modes.
Table 3-1 EDBG LED Control
Operation mode
Power LED
Status LED
Normal operation
Power LED is lit when power is
applied to the board.
Activity indicator, LED flashes
when any communication
happens to the EDBG.
Bootloader mode (idle)
The power LED and the status LED blinks simultaneously.
Bootloader mode (firmware
upgrade)
The power LED and the status LED blinks in an alternating pattern.
For further documentation on the EDBG, see the EDBG User Guide.
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3.2.
Hardware Identification System
™
All Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication chip
mounted. This chip contains information that identifies the extension with its name and some extra data.
When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and
sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,
code examples, and links to relevant documents. Table 3-2 Xplained Pro ID Chip Content on page 8
shows the data fields stored in the ID chip with example content.
Table 3-2 Xplained Pro ID Chip Content
3.3.
Data field
Data type
Example content
Manufacturer
ASCII string
Atmel'\0'
Product Name
ASCII string
Segment LCD1 Xplained Pro'\0'
Product Revision
ASCII string
02'\0'
Product Serial Number
ASCII string
1774020200000010’\0’
Minimum Voltage [mV]
uint16_t
3000
Maximum Voltage [mV]
uint16_t
3600
Maximum Current [mA]
uint16_t
30
Power Sources
The SAM C21 Xplained Pro kit can be powered by several power sources listed in Table 3-3 Power
Sources for SAM C21 Xplained Pro on page 8.
Table 3-3 Power Sources for SAM C21 Xplained Pro
Power input
Voltage requirements
Current requirements
Connector marking
External power
5V ±2% (±100mV) for
USB host operation.
4.3V to 5.5V if USB host
operation is not
required.
Recommended
minimum is 1A to be
able to provide enough
current for connected
USB devices and the
board itself.
Recommended
maximum is 2A due to
the input protection
maximum current
specification.
PWR
Embedded debugger
USB
4.4V to 5.25V (according 500mA (according to
to USB spec.)
USB spec.)
DEBUG USB
The kit will automatically detect which power sources are available and choose which one to use
according to the following priority:
1.
2.
External power.
Embedded Debugger USB.
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Info: External power is required when 500mA from a USB connector is not enough to power
the board with possible extension boards.
3.4.
Xplained Pro Headers and Connectors
3.4.1.
Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU
boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all
pins are not always connected. All connected pins follow the defined pin-out description in Table 3-4 Xplained Pro Standard Extension Header on page 9.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU
boards or to access the pins of the target MCU on Xplained Pro MCU boards directly.
Table 3-4 Xplained Pro Standard Extension Header
Pin number
Name
Description
1
ID
Communication line to the ID chip on an extension board
2
GND
Ground
3
ADC(+)
Analog to digital converter, alternatively positive part of differential
ADC
4
ADC(-)
Analog to digital converter, alternatively negative part of differential
ADC
5
GPIO1
General purpose I/O
6
GPIO2
General purpose I/O
7
PWM(+)
Pulse width modulation, alternatively positive part of differential
PWM
8
PWM(-)
Pulse width modulation, alternatively negative part of differential
PWM
9
IRQ/GPIO
Interrupt request line and/or general purpose I/O
10
SPI_SS_B/
GPIO
Slave select for SPI and/or general purpose I/O
11
I2C_SDA
Data line for I2C interface. Always implemented, bus type.
12
I2C_SCL
Clock line for I2C interface. Always implemented, bus type.
13
UART_RX
Receiver line of target device UART
14
UART_TX
Transmitter line of target device UART
15
SPI_SS_A
Slave select for SPI. Should preferably be unique.
16
SPI_MOSI
Master out slave in line of serial peripheral interface. Always
implemented, bus type.
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3.4.2.
Pin number
Name
Description
17
SPI_MISO
Master in slave out line of serial peripheral interface. Always
implemented, bus type.
18
SPI_SCK
Clock for serial peripheral interface. Always implemented, bus type.
19
GND
Ground
20
VCC
Power for extension board
Xplained Pro Power Header
The power header can be used to connect external power to the SAM C21 Xplained Pro kit. The kit will
automatically detect and switch to any external power if supplied. The power header can also be used as
supply for external peripherals or extension boards. Care must be taken not to exceed the total current
limitation of the on-board regulator when using the 3.3V or 5.0V pin.
Table 3-5 Xplained Pro Power Header
Pin number
Pin name
Description
1
VEXT_P5V0
External 5V input
2
GND
Ground
3
VCC_P5V0
Unregulated 5V (output, derived from one of the input sources)
4
VCC_P3V3_P5 Regulated 3.3V or 5.0V (output, used as main power supply for the
V0
kit)
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4.
Hardware Users Guide
4.1.
Power Distribution
SAM C21 Xplained Pro has two power sources as described in Power Sources on page 8. Figure 4-1 Power Supply Block Diagram on page 11 shows a block diagram of the power supply circuitry. The kit
can be powered from the EDBG USB and an external 5.0V source. The kit will automatically select which
source to draw power from.
The EDBG controls an on-board power switch to the ATSAMC21J18A, the on-board peripherals, and
extension connectors. When the kit is powered up, the EDBG reads the ID chip information from all
connected Xplained Pro extension boards and checks that they are compatible with the voltage selected
by the power selection jumper. If the selected voltage is within the connected extensions ranges the
switch will open. If not, the EDBG power LED will blink rapidly and the switch will stay closed resulting in
no power provided to the ATSAMC21J18A, on-board peripherals, and connectors.
Caution: As the SAM C21 Xplained Pro can be powered by 5.0V care must be taken not to
connect any Xplained Pro extensions that does not support this voltage, doing so may result in
permanent damage. Check the respective extension kit's user guide to see which voltages are
acceptable.
Info: The EDBG only reads the ID information and controls the power switch when the kit is
powered up. This mechanism does not check hot-plugging of extension boards.
Regulator 3.3V
Auto mux
Regulator 3.3V
VCC_P5V0
External 5V input
EDBG
ON / OFF
EDBG USB
VCC_EDBG
Figure 4-1 Power Supply Block Diagram
VCC_P3V3
Power Select
(Jumper)
Power Switch
Jumper
Power source
VCC_TARGET
VCC_MCU
Power switch
Power converter
Peripherals
SAMC21J18
Power consumer
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4.2.
Connectors
The following sections describes the implementation of the relevant connectors and headers on SAM C21
Xplained Pro and their connection to the ATSAMC21J18A. The tables of connections in the sections also
describes which signals are shared between the headers and on-board functionality. Figure 4-2 SAM
C21 Xplained Pro Connector Overview on page 12 shows all available connectors and jumpers on SAM
C21 Xplained Pro.
Figure 4-2 SAM C21 Xplained Pro Connector Overview
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4.2.1.
Xplained Pro Extension Headers
The SAM C21 Xplained Pro headers EXT1, EXT2, and EXT3 offers access to the I/O of the
microcontroller in order to expand the board e.g. by connecting extensions to the board. These headers
are based on the standard extension header specified in Xplained Pro Standard Extension Header on
page 9. The headers have a pitch of 2.54mm.
Table 4-1 Extension Header EXT1
Pin on EXT1
SAM C21
pin
Function
Shared functionality
1 [ID]
-
-
Communication line to the
ID chip on an extension
board.
2 [GND]
-
-
Ground.
3 [ADC(+)]
PB09
INP1
Shield
4 [ADC(-)]
PB08
INN1
Shield
5 [GPIO1]
PA20
GPIO
Shield
6 [GPIO2]
PA21
GPIO
Shield
7 [PWM(+)]
PB12
TC0/WO0
Shield and EDBG GPIO0
8 [PWM(-)]
PB13
TC0/WO1
Shield
9 [IRQ/GPIO]
PB14
IRQ14/GPIO
-
10 [SPI_SS_B/GPIO]
PB15
GPIO
-
11 [TWI_SDA]
PA12
SERCOM2 PAD[0] I2C SDA
EXT2, EXT3, Shield, Crypto
Device, and EDBG I2C
12 [TWI_SCL]
PA13
SERCOM2 PAD[1] I2C SCL
EXT2, EXT3, Shield, Crypto
Device, and EDBG I2C
13 [USART_RX]
PA23
SERCOM3 PAD[1] UART
RX
EXT2, EXT3, and Shield
14 [USART_TX]
PA22
SERCOM3 PAD[0] UART
TX
EXT2, EXT3, and Shield
15 [SPI_SS_A]
PA17
SERCOM1 PAD[1] SPI SS
-
16 [SPI_MOSI]
PA18
SERCOM1 PAD[2] SPI
MOSI
-
17 [SPI_MISO]
PA16
SERCOM1 PAD[0] SPI
MISO
-
18 [SPI_SCK]
PA19
SERCOM1 PAD[3] SPI SCK -
19 [GND]
-
-
Ground.
20 [VCC]
-
-
Power for extension board.
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Table 4-2 Extension Header EXT2
Pin on EXT2
SAM C21
pin
Function
Shared functionality
1 [ID]
-
-
Communication line to the
ID chip on an extension
board.
2 [GND]
-
-
Ground.
3 [ADC(+)]
PA08
AIN10
Shield
4 [ADC(-)]
PA09
AIN11
Shield
5 [GPIO1]
PA10
GPIO
-
6 [GPIO2]
PA11
GPIO
-
7 [PWM(+)]
PB30
TCC0/WO0
Shield
8 [PWM(-)]
PB31
TCC0/WO1
Shield
9 [IRQ/GPIO]
PB16
IRQ0/GPIO
EDBG GPIO1
10 [SPI_SS_B/GPIO]
PB17
GPIO
EDBG GPIO2
11 [TWI_SDA]
PA12
SERCOM2 PAD[0] I2C SDA
EXT1, EXT3, Shield, Crypto
Device, and EDBG I2C
12 [TWI_SCL]
PA13
SERCOM2 PAD[1] I2C SCL
EXT1, EXT3, Shield, Crypto
Device, and EDBG I2C
13 [USART_RX]
PA23
SERCOM3 PAD[1] UART
RX
EXT1, EXT3, and Shield
14 [USART_TX]
PA22
SERCOM3 PAD[0] UART
TX
EXT1, EXT3, and Shield
15 [SPI_SS_A]
PB03
SERCOM5 PAD[1] SPI SS
16 [SPI_MOSI]
PB00
SERCOM5 PAD[2] SPI
MOSI
EXT3, Shield, Shield(2), and
EDBG SPI
17 [SPI_MISO]
PB02
SERCOM5 PAD[0] SPI
MISO
EXT3, Shield, Shield(2), and
EDBG SPI
18 [SPI_SCK]
PB01
SERCOM5 PAD[3] SPI SCK EXT3, Shield, Shield(2), and
EDBG SPI
19 [GND]
-
-
Ground.
20 [VCC]
-
-
Power for extension board.
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Table 4-3 Extension Header EXT3
4.2.2.
Pin on EXT3
SAM C21
pin
Function
Shared functionality
1 [ID]
-
-
Communication line to the
ID chip on an extension
board.
2 [GND]
-
-
Ground.
3 [ADC(+)]
PB07
AIN9/INP2
Shield
4 [ADC(-)]
PB06
AIN8/INN2
Shield
5 [GPIO1]
PB04
GPIO
Shield
6 [GPIO2]
PB05
GPIO
Shield
7 [PWM(+)]
PA14
TC4/WO0
Crystal footprint
8 [PWM(-)]
PA15
TC4/WO1
User LED and Crystal
footprint
9 [IRQ/GPIO]
PA28
IRQ8/GPIO
User Button and EDBG
GPIO3
10 [SPI_SS_B/GPIO]
PA27
GPIO
Shield
11 [TWI_SDA]
PA12
SERCOM2 PAD[0] I2C SDA
EXT1, EXT2, Shield, Crypto
Device, and EDBG I2C
12 [TWI_SCL]
PA13
SERCOM2 PAD[1] I2C SCL
EXT1, EXT2, Shield, Crypto
Device, and EDBG I2C
13 [USART_RX]
PA23
SERCOM3 PAD[1] UART
RX
EXT1, EXT2, and Shield
14 [USART_TX]
PA22
SERCOM3 PAD[0] UART
TX
EXT1, EXT2, and Shield
15 [SPI_SS_A]
PA02
GPIO
DAC Header
16 [SPI_MOSI]
PB00
SERCOM5 PAD[2] SPI
MOSI
EXT2, Shield, Shield(2), and
EDBG SPI
17 [SPI_MISO]
PB02
SERCOM5 PAD[0] SPI
MISO
EXT2, Shield, Shield(2), and
EDBG SPI
18 [SPI_SCK]
PB01
SERCOM5 PAD[3] SPI SCK EXT2, Shield, Shield(2), and
EDBG SPI
19 [GND]
-
-
Ground.
20 [VCC]
-
-
Power for extension board.
Arduino Connectors
SAM C21 Xplained Pro implements Arduino shield connectors based on the Arduino Uno. All references
to Arduino pin names are taken from the official Arduino schematics of the Arduino Uno.
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Caution: The target section of SAM C21 Xplained Pro can be powered by 3.3V or 5.0V. The
maximum voltage the I/O pins can tolerate depends on the supply voltage. Providing higher
voltages like 5V to an I/O pin when the ATSAMC21J18A is powered by 3.3V could damage the
board.
Info: Note that all pins do not have the exact same functionality as on the Arduino Uno on the
shield connectors. Each shield should be checked for compatibility before it is connected.
Table 4-4 J802 - Power
Pin on J802 SAM C21 pin Arduino pin name Function
Shared functionality
1
-
RFU
-
-
2
-
IOREF
VCC_TARGET_P3V3_P5V0 -
3
RESETN
RESET
TARGET_RESET
-
4
-
3.3V
VCC_P3V3
-
5
-
5V
VCC_P5V0
-
6
-
GND
GND
-
7
-
GND
GND
-
8
-
VIN
VCC_EXT_P5V0
-
Table 4-5 J803 - Analog
Pin on J803
SAM C21 pin
Arduino pin name
Function
Shared functionality
1
PB09
ADC0
INP1
EXT1
2
PB08
ADC1
INN1
EXT1
3
PA08
ADC2
AIN10
EXT2
4
PA09
ADC3
AIN11
EXT2
5
PB07
ADC4
AIN9 / INP2
EXT3
6
PB06
ADC5
AIN8 / INN2
EXT3
Table 4-6 J804 - Digital Low
Pin on J804 SAM C21 pin Arduino pin name Function
Shared functionality
1
PA23
D0 / RX0
SERCOM3 PAD1 UART RX EXT1, EXT2, and EXT3
2
PA22
D1 / TX0
SERCOM3 PAD0 UART TX EXT1, EXT2, and EXT3
3
PA20
D2
GPIO
EXT1
4
PB12
D3
TC0_W0
EXT1 and EDBG GPIO
5
PA21
D4
GPIO
EXT1
6
PB13
D5
TC0_W1
EXT1
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Pin on J804 SAM C21 pin Arduino pin name Function
Shared functionality
7
PB30
D6
TCC0_W0
EXT2
8
PB04
D7
GPIO
EXT3
Table 4-7 J801 - Digital High
Pin on J801 SAM C21 pin Arduino pin name Function
Shared functionality
1
PB05
D8
GPIO
EXT3
2
PB31
D9
TCC0_W1
EXT2
3
PA27
D10 / SPI-SS
GPIO
EXT3
4
PB00
D11 / SPI-MOSI
SERCOM5 PAD2
EXT2, EXT3, EDBG SPI, and
Shield
5
PB02
D12 / SPI-MISO
SERCOM5 PAD0
EXT2, EXT3, EDBG SPI, and
Shield
6
PB01
D13 / SPI-SCK
SERCOM5 PAD3
EXT2, EXT3, EDBG SPI, and
Shield
7
-
GND
-
-
8
PA03
AREF
ADC / DAC VREFA
9
PA12
SDA
SERCOM2 PAD0
EXT1, EXT2, EXT3, Crypto, and
EDBG I2C
10
PA13
SCL
SERCOM2 PAD1
EXT1, EXT2, EXT3, Crypto, and
EDBG I2C
Table 4-8 J800 - SPI
4.2.3.
Pin on
J800
SAM C21 pin Arduino pin
name
Function
Shared functionality
1
PB02
MISO
SERCOM5 PAD0
EXT2, EXT3, EDBG SPI,
and Shield
2
-
5V
VCC_TARGET_P3V3_P5V0 -
3
PB01
SCK
SERCOM5 PAD3
EXT2, EXT3, EDBG SPI,
and Shield
4
PB00
MOSI
SERCOM5 PAD2
EXT2, EXT3, EDBG SPI,
and Shield
5
RESETN
RESET
TARGET_RESET
-
6
-
GND
GND
-
VCC Selection Header
The SAM C21 Xplained Pro has a 3-pin header labeled VCC_SEL on the board. This header can be used
to select between 3.3V and 5.0V as the supply voltage for the ATSAMC21J18A, peripherals, and
extension headers by placing a jumper on pin 1-2 or pin 2-3. Selecting 5.0V will supply the kit directly
from the USB or an external 5.0V source. Selecting 3.3V will supply the kit from an on-board regulator.
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Table 4-9 VCC_SEL Header
4.2.4.
VCC_SEL header pin
Function
1
VCC_P5V0
2
VCC_TARGET
3
VCC_P3V3
VREF Header
SAM C21 Xplained Pro has a 6-pin header labeled VREF on the board. This header can be used to
select / apply a voltage reference to the ADC, DAC, and SDADC. Jumpers can be used to tie SADC
VREF and ADC/DAC VREFT to the kit target voltage from pin 1-3 and 2-4, or external voltages can be
applied across pin 3-5 and 4-6.
Table 4-10 VREF Header
4.2.5.
VREF header pin
Pin / Net
Function
1
VCC_AREF_P3V3_P5V0
Filtered kit target voltage
2
VCC_AREF_P3V3_P5V0
Filtered kit target voltage
3
PA04
SDADC voltage reference
4
PA03
ADC / DAC voltage reference
5
GND
Ground
6
GND
Ground
DAC Header
SAM C21 Xplained Pro has a 2-pin header labeled DAC-OUT on the board that is connected to the DAC
output of the ATSAMC21J18A and ground.
Table 4-11 DAC Header
4.2.6.
DAC header pin
Pin / Net
Function
Shared functionality
1
PA02
DAC0 output
EXT3
2
GND
Ground
Current Measurement Header
An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of
the SAM C21 Xplained Pro. All power to the ATSAMC21J18A is routed through this header. To measure
the power consumption of the device remove the jumper and replace it with an ammeter.
Caution: Removing the jumper from the pin-header while the kit is powered may cause the
ATSAMC21J18A to be powered through its I/O pins. This may cause permanent damage to the
device.
4.2.7.
Cortex Debug Connector
®
SAM C21 Xplained Pro has a 10-pin 50-mil Cortex Debug Connector that can be used to attach external
debuggers to the ATSAMC21J18A.
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Table 4-12 Cortex Debug Connector
Cortex Debug Connector pin
Pin / Net
Function
1
VCC_TARGET_P3V3_P5V0
ATSAMC21J18A voltage
2
SWDIO
SWD data signal
3
GND
Ground
4
SWCLK
SWD clock signal
5
GND
Ground
6
-
-
7
-
-
8
-
-
9
GND
Ground
10
RESETN
Target reset signal
4.3.
Peripherals
4.3.1.
LED
There is one yellow LED available on the SAM C21 Xplained Pro board that can be turned on and off.
The LED is activated by driving the connected I/O line to low.
Table 4-13 LED Connection
4.3.2.
SAM C21 pin
Function
Shared functionality
PA15
Yellow LED0
Crystal footprint and EXT3
Mechanical Buttons
SAM C21 Xplained Pro contains two mechanical buttons connected to the SAM C21. One button is the
RESET button connected to the reset line and the other is a generic user configurable button. When a
button is pressed it will drive the I/O line to GND.
Info: There is no pull-up resistor connected to the generic user button. Remember to enable
the internal pull-up in the SAM C21 to use the button.
Table 4-14 Mechanical Buttons
4.3.3.
SAM C21 pin
Function
Shared functionality
RESETN
RESET
Shield, Shield(2), and EDBG
PA28
SW0
EXT3 and EDBG GPIO3
Crystals
The SAM C21 Xplained Pro kit contains one mounted 32.768kHz crystal and a footprint for higher
frequency crystals that can be used as clock sources for the SAM C21. The crystals have cut-straps next
to them that can be used to measure the oscillator safety factor. This is done by cutting the strap and
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adding a resistor across the strap. Information about oscillator allowance and safety factor can be found
in appnote AVR4100. Information about clock calibration and compensation can be found in appnote
AT03155.
®
The footprint for the external crystal is based on the Epson TSX-3225 series.
Table 4-15 External 32.768kHz Crystal
SAM C21 pin
Function
Shared functionality
PA00
XIN32
-
PA01
XOUT32
-
Table 4-16 External Crystal Footprint
4.3.4.
SAM C21 pin
Function
Shared functionality
PA14
XIN
EXT3
PA15
XOUT
EXT3 and User LED
CAN
ATSAMC21J18A has two CAN modules that performs communication according to ISO11898-1 (Bosch
CAN specification 2.0 part A,B) and Bosch CAN FD specification V1.0.
CAN0 is connected to an on-board ATA6561 CAN physical-layer transceiver. Table 4-17 ATA6561
Connections on page 20 shows connections between the ATSAMC21J18A and the ATA6561.
The CAN differential signals are connected to a 1 x 2, 100 mil pin-header labeled CAN.
Table 4-17 ATA6561 Connections
SAM C21pin
Function
ATA6561 function
Shared functionality
PA24
CAN0TX
TXD
-
PA25
CAN0RX
RXD
-
Table 4-18 CAN Header
4.3.5.
CAN header pin
Function
1
CANH
2
CANL
LIN
An ATA663211 LIN transceiver is mounted on the kit to convert the LIN signals from the SERCOM
module in the SAM C21 device. The LIN compatible signals are available at a 3-pin header.
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Table 4-19 LIN Transceiver
SAM C21 pin
Function
ATA663211 function
Shared functionality
PA06
SERCOM0 PAD[2] LIN
TX
LIN TXD
-
PA07
SERCOM0 PAD[3] LIN
RX
LIN RXD
-
PB22
GPIO
LIN EN
-
Table 4-20 LIN Header
LIN header pin
Function
1
VS
2
GND
3
LIN
Table 4-21 Master Node Pull-up Enable Header
LIN header pin
Function
1
LIN
2
1kΩ pull-up to VS
Table 4-22 LIN VCC Power
4.3.6.
LIN header pin
Function
1
VS
2
VCC_TARGET_P3V3_P5V0
QTouch Button
There is one self capacitance button available on the SAM C21 Xplained Pro board that can be used as
I/O. This QTouch button is intended to be driven by the built-in Peripheral Touch Controller (PTC) of the
device.
Note: To get started with QTouch, refer to Atmel QTouch Library and Atmel QTouch Composer.
Table 4-23 QTouch Connection
4.3.7.
SAM C21 pin
Silkscreen text
PA05
QT BTN1
Crypto Footprints
Several of the Atmel security devices, including CryptoAuthentication devices like the ATECC108A,
requires only an I2C interface to work, and they share the same packages and pinouts. SAM C21
Xplained Pro has implemented SOIC8 and UDFN8 footprints for these devices so the user may solder
them on themselves. Table 4-24 Crypto Footprints on page 22 shows all the connections between the
footprints and the ATSAMC21J18A.
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Table 4-24 Crypto Footprints
4.4.
Pin on footprint
SAM C21 pin
Function
Shared functionality
1
-
NC
-
2
-
NC
-
3
-
NC
-
4
-
GND
-
5
PA12 [SDA]
I2C data line
EXT1, EXT2, EXT3,
Shield, and EDBG I2C
6
PA13 [SCL]
I2C clock line
EXT1, EXT2, EXT3,
Shield, and EDBG I2C
7
-
NC
-
8
-
VCC_TARGET_P3V3
-
PADDLE
-
GND
-
Kit Modifications
SAM C21 Xplained Pro has several resistors and jumpers that can be removed/cut to disconnect I/O pins
of the ATSAMC21J18A from connectors and on-board ICs and to disconnect/measure power to different
sections.
Table 4-25 Resistors
Designator
From
To
Comment
R313
PA14
EXT3 pin 7
R314
PA15
EXT3 pin 8 and LED
Remove when using
external crystal
R609
RESETN
RESET NET
Remove to disconnect
the RESETN pin from
the reset system
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Designator
From
To
Comment
R607
PB11 RX
CDC RX
R610
RESET NET
EDBG RESET
Remove to disconnect
pins from the EDBG
level shifters
R611
PA31 SWDIO
EDBG SWDIO
R612
PA30 SWCLK
EDBG SWCLK
R614
PB02 MISO
EDBG MISO
R618
PB12
EDBG GPIO0
R619
PB16
EDBG GPIO1
R620
PB17
EDBG GPIO2
R621
PA28
EDBG GPIO3
R800
RESETN
Arduino shield RESET
Remove to disconnect
the reset system from
the Arduino shield
connectors
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Figure 4-3 Resistors Top
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Figure 4-4 Resistors Bottom
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Table 4-26 Jumpers
Designator
From
To
Comment
J101
VCC_TARGET_X_P3V3 VCC_TARGET_P3V3_P Remove this jumper
_P5V0
5V0
(JS100) to measure
current to the MCU
section
J102
VCC_IN_P5V0 (pin 1)
and
VCC_P3V3_TARGET
(pin 3)
VCC_TARGET_SWITC
H_P3V3_P5V0
Use this jumper (JS101)
to select either 5.0V or
3.3V voltage to the
Target section. Default
setting in production is
5.0V.
J103
VCC_IN_P5V0
VCC_P5V0
Cut this jumper to
measure current from
the 5.0V input MUX
section. The footprint is
0603 sized.
J104
3.3V linear regulator
VCC_EDBG_P3V3
output for EDBG section
Cut this jumper to
measure current to the
EDBG section. The
footprint is 0603 sized.
J105
3.3V linear regulator
output for Target and
MCU sections
Cut this jumper to
measure current to the
Target and MCU
sections. The footprint is
0603 sized.
J106
VCC_TARGET_X_P3V3 VCC_TARGET_P3V3_P Cut this jumper to
_P5V0
5V0
measure current to the
Target section. The
footprint is 0603 sized.
J300
PA15_XOUT
16MHz crystal pin
Cut this jumper and
mount resistors to find
16MHz crystal oscillator
safety factor. The
footprint is 0603 sized.
J501
LIN signal
Pull-up resistor to VS
voltage
Mount this jumper
(JS501) to set the LIN
transceiver as Master
node. Default setting in
production is mounted.
VCC_P3V3
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Designator
From
To
Comment
J502
VS_LIN
VCC_TARGET_P3V3_P Mount this jumper
5V0
(JS500) to power the
LIN transceiver from
VCC_TARGET_P3V3_P
5V0. Remove this
jumper when the LIN
transceiver is powered
from the LIN bus.
Default setting in
production is mounted.
J504
CAN device, Standby
pin
GND
Cut this jumper to
explore the standby
functionality of the CAN
transceiver (ATA6561).
The footprint is 0603
sized.
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Figure 4-5 Jumpers Top
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Figure 4-6 Jumpers Bottom
4.5.
Embedded Debugger Implementation
SAM C21 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and
debug the ATSAMC21J18A using Serial Wire Debug (SWD). The Embedded Debugger also include a
Virtual Com port interface over UART, an Atmel Data Gateway Interface over SPI, and TWI and it
includes four of the SAM C21 GPIOs. Atmel Studio can be used as a front end for the Embedded
Debugger.
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4.5.1.
Serial Wire Debug
The Serial Wire Debug (SWD) use two pins to communicate with the target. For further information on
how to use the programming and debugging capabilities of the EDBG, see Embedded Debugger on page
7.
Table 4-27 SWD Connections
4.5.2.
SAM C21 pin
Function
PA30
SWD clock
PA31
SWD data
Virtual COM Port
The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAMC21J18A
UARTs. For further information on how to use the Virtual COM port, see Embedded Debugger on page 7.
Table 4-28 Virtual COM Port Connections
4.5.3.
SAM C21 pin
Function
Shared functionality
PB10
SERCOM4 PAD[2] UART TXD (SAM C21 TX line)
-
PB11
SERCOM4 PAD[3] UART RXD (SAM C21 RX line) -
Atmel Data Gateway Interface
The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either an SPI or I²C.
The DGI can be used to send a variety of data from the ATSAMC21J18A to the host PC. For further
information on how to use the DGI interface, see Atmel Data Visualizer and the EDBG User Guide.
Table 4-29 DGI Interface Connections when using SPI
SAM C21 pin
Function
Shared functionality
PB23
GPIO/SPI SS (Slave select) (SAM C21 is Master)
-
PB02
SERCOM5 PAD[0] SPI MISO (Master In, Slave
Out)
EXT2, EXT3, Shield,
and Shield(2)
PB00
SERCOM5 PAD[2] SPI MOSI (Master Out, Slave
In)
EXT2, EXT3, Shield,
and Shield(2)
PB01
SERCOM5 PAD[3] SPI SCK (Clock Out)
EXT2, EXT3, Shield,
and Shield(2)
Table 4-30 DGI Interface Connections when using I²C
SAM C21 pin
Function
Shared functionality
PA12
SERCOM2 PAD[0] SDA (Data line)
EXT1, EXT2, EXT3,
Shield, and Crypto
Footprints
PA13
SERCOM2 PAD[1] SCL (Clock line)
EXT1, EXT2, EXT3,
Shield, and Crypto
Footprints
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time
stamp pin value changes. This makes it possible to accurately time stamp events in the SAM C21
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application code. For further information on how to configure and use the GPIO monitoring features, see
Atmel Data Visualizer and the EDBG User Guide.
Table 4-31 GPIO Lines Connected to the EDBG
SAM C21 pin
Function
Shared functionality
PB12
GPIO0
Shield and EXT1
PB16
GPIO1
EXT2
PB17
GPIO2
EXT2
PA28
GPIO3
User Button and EXT3
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5.
5.1.
Appendix
Getting Started with IAR
®
®
IAR Embedded Workbench for ARM is a proprietary high efficiency compiler not based on GCC.
™
Programming and debugging of Xplained Pro kits are supported in IAR Embedded Workbench for ARM
using the common CMSIS-DAP interface. Some initial settings have to be set up in the project to get the
programming and debugging to work.
The following steps will explain how to get your project ready for programming and debugging:
1.
2.
3.
4.
5.
6.
Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the
project.
In the category General Options, select the Target tab. Select the device for the project or, if not
listed, the core of the device.
In the category Debugger, select the Setup tab. Select CMSIS DAP as the driver.
In the category Debugger, select the Download tab. Check the check box for Use flash loader(s)
option.
In the category Debugger > CMSIS DAP, select the Setup tab. Select System (default) as the
reset method.
In the category Debugger > CMSIS DAP, select the JTAG/SWD tab. Select SWD as the interface
and optionally select the SWD speed.
Figure 5-1 Select Target Device
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Figure 5-2 Select Debugger
Figure 5-3 Configure Flash Loader
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Figure 5-4 Configure Reset
Figure 5-5 Configure Interface
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5.2.
Connecting a SAM-ICE to an Xplained Pro Board
™
Xplained Pro kits featuring a 10-pin 50mil debug connector can use external debug tools like SAM-ICE
or Atmel-ICE instead of the built-in EDBG. Devices using SWD interface on-board will have a connector
with the pinout compatible with the Cortex Debug Connector.
You can connect the SAM-ICE to the debug connector on an Xplained Pro using either an Atmel-ICE
adapter, SAM-ICE adapter, or a 10-pin 50-mil header to squid cable. When using a squid cable, see the
table and figure below for how to connect the SAM-ICE to the Xplained Pro board.
Table 5-1 Squid Cable Connections
Squid Cable pin
SAM-ICE pin
1 (VCC)
1 (VTref)
2 (SWDIO/TMS)
7 (TMS)
3 (GND)
4 (GND)
4 (SWCLK/TCK)
9 (TCK)
5 (GND)
6 (GND)
6 (SWO/TDO)
13 (TDO) (1)
7 (Not used)
8 (Not used)
9 (Not used)
10 (RESET)
15 (RESET)
Note: 1. Optional, if the device has this functionality.
Figure 5-6 SAM-ICE using a Squid Cable
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Figure 5-7 SAM-ICE using an Atmel-ICE Adapter
Important: If contention with the on-board EDBG occur, power the Xplained Pro board from another input
like the external power header or from the target USB. Physically removing the connection
between the EDBG and the debug header by removing 0Ω resistors, where available, or cutting
the tracks to the EDBG can also be done.
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6.
Hardware Revision History and Known Issues
6.1.
Identifying Product ID and Revision
The revision and product identifier of Xplained Pro boards can be found in two ways; either through Atmel
Studio or by looking at the sticker on the bottom side of the PCB.
By connecting an Xplained Pro MCU board to a computer with Atmel Studio 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. Information about connected Xplained Pro extension boards will also
appear in the Atmel Kit's window.
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
The product identifier for SAM C21 Xplained Pro is A09-2419.
6.2.
Revision 5
Revision 5 fixes all known issues outlined on rev. 2-3. The power supply system is divided in two with a
separate 3.3V regulator for both EDBG, and for the Target section. The power supply block diagram for
revision 2 and 3 is shown below. The power switch has been redesigned to avoid voltage leakage at
power on. The DAC, LIN, and CAN connectors have been moved to ease mounting in production. The
RESET level-shifter has been redesigned to avoid leakage when target power is switched off.
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Figure 6-1 Revision 2 and 3 Power Supply Block Diagram
VCC_P3V3
VCC_P5V0
Regulator 3.3V
EDBG
External 5V input
Auto mux
Power Select
(Jumper)
EDBG USB
Power source
ON / OFF
Power Switch
Power switch
VCC_MCU
Jumper
VCC_TARGET
Power converter
Power consumer
SAMC21J18
Peripherals
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Figure 6-2 Revision 2 and 3 Connector Block Diagram
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Figure 6-3 Revision 2 and 3 Top Side Resistor Overview
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Figure 6-4 Revision 2 and 3 Bottom Side Resistor Overview
Related Links
The QTouch Button PAD is not Connected on page 42
Kit Does Not Work with 3.3V Target Voltage Selected on page 42
Revision 3 on page 42
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6.3.
Revision 3
Revision 3 is almost identical to revision 2 with an additional quick fix for the 3.3V target supply problem.
The fix is implemented by shorting Q102, pin 2 to GND as shown in the figure below. Also the QTouch
pad is connected inside the PCB.
Figure 6-5 Strap Fix
Related Links
The QTouch Button PAD is not Connected on page 42
Kit Does Not Work with 3.3V Target Voltage Selected on page 42
6.4.
Revision 2
Revision 2 is the initial released revision. This revision has engineering samples mounted with part
number ATSAMC21J18A-AUTES.
6.4.1.
The QTouch Button PAD is not Connected
On Revision 2 of the kit, the QTouch button PAD is not connected to the track inside the PCB. This will
cause the QTouch function to work only on the VIA connection point. There is no workaround for this
issue. This will be fixed in next revision of the PCB.
6.4.2.
Kit Does Not Work with 3.3V Target Voltage Selected
Revision 2 of the kit has a start-up problem when target voltage is set to 3.3V. When the EDBG opens the
target voltage power switch from VCC_TARGET_SWITCH_P3V3_P5V0 to VCC_TARGET_P3V3_P5V0 a
power surge is observed. This power surge causes the VCC_P3V3 nets voltage to decrease enough to
trigger the EDBGs BOD, resulting in the EDBG entering a locked state where it can not be used.
Fix/Workaround:
Use the kit with 5.0V selected as the target voltage.
Force the target voltage switch open by connecting Q102 pin 2 to GND.
Important: Forcing the target voltage switch open will disable any protection for Xplained Pro
extension modules connected to EXT1, EXT2, and EXT3. Make sure that connected extensions
supports the selected target voltage.
Related Links
Revision 5 on page 37
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
42
7.
Document Revision History
Doc. rev.
Date
Comment
42460C
10/2015
Fix broken link and updated with kit revision 5
42460B
07/2015
Updated with kit revision 3
42460A
05/2015
Initial document release
Atmel SAM C21 Xplained Pro [USER GUIDE]
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43
8.
Evaluation Board/kit Important Notice
This evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,
DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not
(yet) comply with some or any technical or legal requirements that are applicable to finished products,
including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,
CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS,"
without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all
responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel
from all claims arising from the handling or use of the goods. Due to the open construction of the
product, it is the user's responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL
SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of Atmel covering or
relating to any machine, process, or combination in which such Atmel products or services might be or
are used.
Mailing Address:
Atmel Corporation
1600 Technology Drive
San Jose, CA 95110
USA
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
44
Atmel Corporation
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2015 Atmel Corporation. / Rev.: Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
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