SAM L21 Xplained Pro top level
Contents
1. 18 4 2 5 Backup Ballery eec ert irn certe Fon a Ra 18 4 3 Embedded Debugger Implementation seen een 19 4 3 1 Seral Wire Debug ne 19 4 3 2 Virtlal COM POM 19 4 3 3 Atmel Data Gateway 19 44 SAM L21 Xplained Pro 20 5 Hardware Revision History and Known 1550 5 22 5 1 Identifying Product ID and Revision eene ennemi 22 5 2 C 22 Atmel Atmel SAM L21 Xplained Pro USER GUIDE Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 2 RAEMBLDUID 22 6 Document REVISION MISIOTV inr ren eere Exi in 23 Evaluation Board kit Important 24 Atmel Atmel SAM L21 Xplained Pro USER GUIDE 3 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 1 Introduction 1 1 Features e ATSAML21J18B microcontroller One mechanical reset button mechanical programmable button2. 4 t el Atmel SMART Microcontrollers SAM L21 Xplained Pro USER GUIDE Preface The Atmel SAM L21 Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAML21J18B microcontroller Supported by the Atmel Studio integrated development platform the kit provides easy access to the features of the Atmel ATSAML21J18B 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 ATSAML21J18B The Xplained Pro extension kits offers additional peripherals to extend the features of the board and ease the development of custom designs Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 Table of Contents gif T P 1 1 Introduction i E 4 D ARE I II 4 1 2 Kit 4 024 enne en nenennnsn statt tenens ES 4 2 Getting 6 2 1 Xplained Pro Quick Start ee dep aan p Ede 6 2 2 Design Documentation and Relevant 6 3 7 3 72 Embedded Deb gger nio ii im E 7 3 2
3. Atmel Data Gateway Interface The Embedded Debugger features an Atmel Data Gateway Interface DGI by using either SPI or I C can be used to send a variety of data from the ATSAML21J18B to the host PC For further information on how to use the DGI interface see Atmel Data Visualizer and the EDBG User Guide Atmel Atmel SAM L21 Xplained Pro USER GUIDE 19 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 Table 4 15 DGI Interface Connections When Using SPI SAM L21 pin Function Shared functionality PB34 GPIO SPI SS Slave select SAM 121 is Master PB16 SERCOM5 PAD 0 SPI MISO Master EXT2 and EXT3 In Slave Out PB22 SERCOM5 PAD 2 SPI MOSI Master EXT2 and EXT3 Out Slave in PB23 SERCOM5 PAD 3 SPI SCK Clock Out 2 and Table 4 16 DGI Interface Connections When Using 121 Function Shared functionality PAO8 SERCOM2 PAD 0 SDA Data line 1 EXT2 EXT3 09 SERCOM2 PAD 1 SCL Clock line EXT1 EXT2 and EXT3 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 L21 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 17 GPIO Lines Connected to the EDBG SAM L21 pin Function Shared functionality P
4. Xplained Pro Analog Module 8 EE VU 8 3 2 2 EDBGinterf ace ec 8 3 23 Sample 9 3 2 4 Measurement Ranges and 9 3 3 Hardware Identification 9 3 4 eile E 10 3 5 Xplained Pro Standard Headers and 11 3 5 1 Xplained Pro Standard Extension 11 3 5 2 Xplained Pro Power 12 4 Hardware User 13 AMENS IEEE ee 13 4 1 1 Xplained Pro Extension 14 4 1 2 VDDIO 16 4 3 16 4 1 4 Current Measurement 17 4 1 5 Cortex Debug nene nnne 17 42 ete eret er Ra E E 17 DA E E E D Em 17 42 Mechanical BULOLS uio tct a Si 18 42595 VED M rer 18 4 24 QTrouch BUOM
5. provided by the kit and can thus not identify a connected device so another GPIO is used to detect the USB ID of the device Table 4 5 USB Connections 121 USB function Shared functionality PA14 VBUS Detection Crystal footprint 2 USB ID PA24 USB D 25 USB D Atmel Atmel SAM 121 Xplained Pro USER GUIDE 16 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 4 2 4 2 1 Current Measurement Header An angled 1x2 100mil pin header marked with MCU current measurement is located at the upper edge of the SAM 121 Xplained Pro All power to the ATSAML21J18B 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 ATSAML21J18B to be powered through its pins This may cause permanent damage to the device Cortex Debug Connector SAM L21 Xplained Pro has a 10 pin 50 mil Cortex Debug Connector that can be used to attach external debuggers to the ATSAML21J18B Table 4 6 Cortex Debug Connector Cortex Debug Pin Net Shared functionality Connector pin VCC TARGET ATSAML21J18B voltage PA31 SWD data signal EDBG SWD GND Ground SWD clock signal EDBG SWD GND Ground Tolol nlo GND Ground A o RESETN Target reset signal Peripherals Crystals The SAM L21 Xplained Pro k
6. the SWD interface is connected between the EDBG and the ATSAML21J18B The Virtual COM Port is connected to a UART on the ATSAML21J18B 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 ATSAML21J18B must match the settings given in the terminal software Note If not set automatically data terminal ready DTR must be set in the terminal software The 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 ATSAML21J18B 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 L21 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 Activity indicator LED flashes applied to the board when any communication happens to the EDBG Bootloader mode idle The power LED and the status LED blinks simultaneously Bootloader mode
7. Relevant Links The following list contains links to the most relevant documents and software for the SAM L21 Xplained Pro e 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 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 MO MO and M1 cores 32KB for devices with other cores QTouch Library QTouch Library for Atmel AVR and ARM based microcontrollers Atmel QTouch Composer Tool for developing capacitive buttons sliders and wheels applications e 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 CO
8. B GPIO PB15 14 TWI_SDA 08 12 TWI_SCL 09 13 USART RX PA19 14 USART TX PA18 15 SPI SS A PA17 16 SPI MOSI PB22 17 SPI MISO 16 18 SPI SCK PB23 19 GND 20 VCC Table 4 3 Extension Header EXT3 AIN 19 GPIO GPIO TC4 WO 0 TCA WO 1 IRQ14 GPIO GPIO 2 PAD 0 C SDA SERCOM2 PAD 1 SCL SERCOM 1 PAD 3 UART RX SERCOM 1 PAD 2 UART TX GPIO SERCOMS PAD 2 SPI MOSI SERCOMS PAD 0 SPI MISO SERCOMS PAD 3 SPI EXT2 pin SAM 121 Shared functionality EDBG GPIO2 EDBG 1 EXT3 and EDBG lC EXT1 EXT3 and EDBG lC EXT3 UART EXT3 UART and EDBG SPI EXT3 and EDBG SPI and EDBG SPI Ground Power for extension board EXT3 pin aay 121 HEN Shared functionality 1 ID 2 GND E 3 ADC PBOO 4 ADC 1 5 GPIO1 PB30 6 GPIO2 15 7 PWM PB10 8 PWM PB11 9 IRQ GPIO PA16 10 5 SS B GPIO PA27 11 TWI SDA PA08 Atmel AIN 8 AIN 9 GPIO TCCO WOI4 TCCO WO 5 IRQO GPIO GPIO SERCOM2 PAD 0 C SDA Communication line to the ID chip on an extension board Ground EDBG GPIOO LEDO EDBG GPIO1 EXT1 EXT2 and EDBG lC Atmel SAM 121 Xplained Pro USER GUIDE 15 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 EXT3 pin SAM 121 ERN Shared functionality 12 TWI SCL 09 SERCOM2 PAD 1 SCL EXT1 EXT2 and EDBG lC 13 USART RX PA19 SERCOM 1
9. BO1 GPIOO EXT3 PA16 GPIO1 EXT3 PA20 GPIO2 EXT2 PA21 GPIO3 EXT2 4 4 121 Xplained Pro Configuration On the SAM L21 Xplained Pro the MCU and the MCU peripherals e g extensions are powered by its own regulator as show in Figure 4 2 SAM L21 Xplained Pro XAM Implementation Block Diagram on page 21 All other parts of the board mainly embedded debugger and accompanying Xplained Pro Analog Module XAM are powered from a separate regulator The current to the MCU and peripherals can be measured by connecting them to the XAM output through jumper settings Atmel Atmel SAM L21 Xplained Pro USER GUIDE 20 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 Figure 4 2 SAM 121 Xplained Pro Implementation Block Diagram Xplained Pro MCU power measurement jumper Target Peripherals Current measurement bypass jumper selection Xplained Pro Analog Module XAM Target Regulator On the SAM L21 Xplained Pro the XAM can be used in four configurations 1 Nocurrent measurement or external MCU current measurement The XAM is bypassed and thus the MCU and peripherals are supplied directly by the regulator Set both jumpers in the BYPASS position In this configuration it is also possible to connect external measurement tools on the Xplained Pro MCU power measurement header to measure MCU current directly instead of using the XAM 2 MCU current measurement The XAM measures only the MCU current while
10. EEE FCC CE or UL except as may be otherwise noted on the board kit Atmel supplied this board kit AS 15 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 Atmel SAM L21 Xplained Pro USER GUIDE 24 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 Atmel Enabling Unlimited Possibilities ODEO Atmel Corporation 1600 Technology Drive San Jose CA 95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2015 Atmel Corporation Rev Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 Atmel Atmel logo and combinations
11. M 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 L21 Xplained Pro in the Atmel store Atmel Store link Atmel Atmel SAM L21 Xplained Pro USER GUIDE 6 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 3 1 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 that 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 that 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 Embedded Debugger The SAM L21 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 ATSAML21J18B On SAM L21 Xplained Pro
12. O Slave select for SPI and or general purpose I O Data line for 2 interface Always implemented bus type Clock line for I C interface Always implemented bus type Receiver line of target device UART Transmitter line of target device UART Slave select for SPI Should preferably be unique Master out slave in line of serial peripheral interface Always implemented bus type Master in slave out line of serial peripheral interface Always implemented bus type Clock for serial peripheral interface Always implemented bus type Ground Power for extension board Atmel SAM L21 Xplained Pro USER GUIDE 11 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 3 5 2 Pro Power Header The power header can be used to connect external power to the SAM L21 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 pin Table 3 5 Xplained Pro Power Header Pin number Pin name Description 1 _ 5 External 5V input 2 GND Ground 3 VCC P5VO Unregulated 5V output derived from one of the input sources 4 VCC P3V3 Regulated 3 3V output used as main power supply for the kit Atmel Atmel SAM 121 Xplained Pro USER GUIDE 12 Atmel 42405B SAM L21
13. One QTouch button yellow user LED Backup battery e 32 768kHz crystal USBinterface device and reduced host mode Three Xplained Pro extension headers Embedded Debugger Auto ID for board identification Atmel Studio One yellow status LED One green board power LED Symbolic debug of complex data types icluding scope information Programming and debugging including power measurements Data Gateway Interface SPI I C four GPIOs Virtual COM port CDC Embedded current measurement circuitry with Atmel Data Visualizer support for data visualization USB powered A Supported with application examples in Atmel Software Framework 1 2 Kit Overview The Atmel SAM L21 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel ATSAML21J18B The kit offers a set of features that enables the ATSAML21J18B user to get started with the SAM L peripherals right away and to get an understanding of how to integrate the device in their own design Atmel Atmel SAM L21 Xplained Pro USER GUIDE 4 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 Figure 1 1 SAM L21 Xplained Pro Evaluation Kit Overview CURRENT MEASUREMENT SWO0 USER BUTTON HEADER RESET BUTTON TARGET USB DEBUG USB Emu USER LEDO ono sg POWER EN Voca HEADER i CORTEX DEBUG MCU CURRENT FOR EXTERNAL MEASUREMENT NW DEBUGGER SELECT JUMPER T Ti CURRENT MEASUREMENT Atme
14. PAD 3 UART RX EXT2 UART 14 USART TX PA18 SERCOM 1 PAD 2 UART TX EXT2 UART 15 SPI_SS_A PB17 SERCOM5 PAD 1 SPI SS 16 SPI MOSI PB22 SERCOM5 PAD 2 SPI MOSI EXT2 and EDBG SPI 17 SPI MISO PB16 SERCOM5 PAD 0 SPI MISO EXT2 and EDBG SPI 18 SPI SCK PB23 SERCOM5 PAD 3 SPI SCK EXT2 and EDBG SPI 19 GND Ground 20 VCC Power for extension board 4 1 2 VDDIO Header The SAM 121 Xplained Pro has a 2 pin header connecting the power supply from net to VCC net through a jumper This header can be used to measure the current to the I O block of the SAM L21 device by removing the jumper and connect an ammeter SAM L21 has the possibility to run the block at a lower voltage level than the MCU is running and thus support interfacing devices that require lower operating voltages The header can then be used to power the VCC pin at a different voltage level by removing the jumper and connecting a power supply with the desired voltage Refer to the datasheet of the device for valid operating voltages Table 4 4 VDDIO Header VDDIO header pin Function 1 VCC MCU power supply 2 VCC power input 4 1 3 USB The SAM L21 Xplained Pro has a Micro USB connector for use with the SAM L21 USB module labeled as TARGET USB on the kit To be able to detect when a target USB cable is connected in self powered mode a GPIO is used to detect the VBUS voltage on the connector In USB host mode VBUS voltage is
15. Xplained Pro User Guide 07 2015 4 Hardware User Guide 4 1 Connectors The following sections describes the implementation of the relevant connectors and headers on SAM L21 Xplained Pro and their connection to the ATSAML21J18B The tables of connections in the sections also describes which signals are shared between the headers and on board functionality Figure 4 1 SAM L21 Xplained Pro Connector Overview on page 13 shows all available connectors and jumpers on SAM L21 Xplained Pro Figure 4 1 SAM L21 Xplained Pro Connector Overview TARGET USB DEBUG USB a 8 12 MEASURE _ measure Bypass _ ByPass 5 o SAM L21 e E Cortex Debug 090000 CURRENT MEASUREMENT 12 OOo 3 oot oog 5 lt gt 1 2 ATTEN VCC MCU IO CR1210 8 8 Q7 gt oor 0085 E 2 Extension Header 3 Q Atmel Atmel SAM L21 Xplained Pro USER GUIDE 13 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 4 1 4 Xplained Pro Extension Headers The SAM 121 Xplained Pro headers EXT1 EXT2 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 extensio
16. bove 100mA the error will low gain stage increase to 1 LSB 5 at 400mA Maximum current is 400mA The ranges are switched automatically by the XAM to achieve best measurement results and the currently active range is visualized in the Atmel Data Visualizer frontend tool The maximum voltage drop over the shunt resistor is 100mV and the XAM will switch the range automatically before this limit is reached 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 9 shows the data fields stored in the ID chip with example content Table 3 2 Xplained Pro ID Chip Content Manufacturer ASCII string Atmel O Product Name ASCII string Segment LCD1 Xplained Pro 0 Atmel Atmel SAM L21 Xplained Pro USER GUIDE 9 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 Data field Data type Example content Product Revision ASCII string 020 Product Serial Number ASCII string 1774020200000010 0 Minimum V
17. firmware The power LED and the status LED blinks in an alternating pattern upgrade For further documentation on the EDBG see the EDBG User Guide Atmel Atmel SAM L21 Xplained Pro USER GUIDE 7 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 3 2 Xplained Pro Analog Module XAM 3 2 1 Overview The Xplained Pro Analog Module XAM extends the embedded debugger with high dynamic range current measurement This enables power profiling of the target system Control MCU Current output O Calibration ON OFF Pre amplifier Range selection Active filter with Current input Xplained Pro Analog Module XAM The XAM consists of e Calibration circuitry Voltage reference Analog frontend Shunt resistors with a range selection switch Pre amplifier Two active filters with gain Control MCU Analog to digital converter Signal processing Control communication interface to the EDBG The current measurement frontend is a high side shunt measurement with a pre amplifier and a second active filter stage with gain The wide dynamic range is achieved by four measurement ranges which are defined by two shunts and the two parallel second stage active filters with gain 3 2 2 EDBGinterface The Xplained Pro Analog Module XAM is connected to the EDBG with the following interfaces e 12 This is used to control and configure the Current measureme
18. it contains one mounted 32 768kHz crystal and a footprint for higher frequency crystals that can be used as clock sources for the SAM L21 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 adding a resistor across the strap Information about oscillator allowance and safety factor can be found in application note AVR41001 information about clock calibration and compensation can be found in application note AT03155 The footprint for the external crystal is based on the Fox FQ5032B series Info Note that PA14 and PA15 are shared with USB VBUS detect and pin 5 To disconnect PA14 and PA15 from all functionality except XTAL cut J300 and J302 Atmel Atmel SAM L21 Xplained Pro USER GUIDE 17 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 Table 4 7 External 32 768kHz Crystal SAM L21 l Function Shared functionality PA00 XIN32 1 XOUT32 Table 4 8 External Crystal Footprint SAM L21 pin Function Shared functionality PA14 XIN USB VBUS PA15 XOUT EXT3 4 2 2 Mechanical Buttons SAM L21 Xplained Pro contains two mechanical buttons One button is the RESET button connected to the SAM L21 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 Note There is no pull up resistor connected to the generic user button Remember to enable
19. l SELECT JUMPER lamia EXTENSION 1 SAML21 x PLAINED 5 HEADER 32kHz CRYSTAL SELECT JUMPER SAML21J18A BACKUP A iue BATTERY AML21J18A VCC IO EXTENSION 2 POWER INPUT HEADER QTOUCH BUTTON EXTENSION 3 HEADER Atmel Atmel SAM L21 Xplained Pro USER GUIDE Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 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 Atmel SAM L21 Xplained Pro is connected to your computer for the first time the operating system will do a driver software installation The driver file supports both 32 bit 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 L21 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
20. n header specified in Table 3 4 Xplained Pro Standard Extension Header on page 11 The headers have a pitch of 2 54mm Table 4 1 Extension Header EXT1 1 pin SAM 121 a Shared functionality 1 ID Communication line to the ID chip on an extension board 2 GND Ground 3 ADC PBO5 AIN 13 4 ADC PA03 AIN 1 5 GPIO1 PBOG GPIO 6 GPIO2 7 GPIO 7 PWM PA12 2 0 8 PWM PAIS TCC2 WO 1 9 IRQ GPIO PBO4 _ IRO4 GPIO 10 SPI 55 B GPIO 02 GPIO SWO 11 TWI_SDA PA08 SERCOM2 PAD 0 PC SDA EXT2 EXT3 and EDBG lC 12 TWI SCIL PA09 SERCOM2 PAD 1 FC SCL EXT2 EXT3 and EDBG lC 13 USART PBO9 _ SERCOMA4PADM UARTRX 14 USART TX lt PAD 0 UART TX 15 SPI SS PAD 1 SPI 55 46 SPI MOSI PA06 __ SERCOMO PAD 2 SPI MOSI 17 SPI MISO 04 SERCOMO PAD 0 SPI MISO 18 SPI SCK PA07 PAD 3 SPI SCK 19 GND E Ground 20 VCC Power for extension board Table 4 2 Extension Header EXT2 EXT2 pin SAM L21 e Shared functionality 4 ID Communication line to the ID chip on an extension board 2 GND Ground ADC PA10 AIN 18 Y8 Onboard QTouch Button 1 Atmel Atmel SAM 121 Xplained Pro USER GUIDE 14 Atmel 42405B SAM L21 Xplained Pro User Guide 07 2015 4 ADC 11 5 GPIO1 PA20 6 GPIO2 21 7 PWM PB12 8 PWM PB13 9 IRQ GPIO PB14 10 SPI SS
21. nt data is streamed to the EDBG via this interface This is a one way data transfer channel from the XAM to the EDBG Atmel Atmel SAM L21 Xplained Pro USER GUIDE 8 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 3 2 3 3 2 4 3 3 e SWD MCU in the is programmed via SWD from the EDBG e At least one GPIO that is connected to the EDBG from the target MCU is also connected to the current measurement unit to enable the user to sync current measurements with his application e Clock sync Synchronization signal to synchronize ADC measurements with EDBG Reference clock Reference clock for the XAM Sample Rate The raw sampling rate of the Xplained Pro analog module XAM is up to 250kHz and with the default averaging configuration average of 16 samples the actual output of the XAM is 16 67kSPS note that the XAM output sample rate is not an integer fraction of the raw sampling Measurement Ranges and Accuracy The Xplained Pro analog module has four measurement ranges These are defined by two shunt resistors and two gain stages Measurement Hardware Resolution Accuracy Comments range Range 1 Low current shunt and 20nA 1 LSB 1 Below 1A the error will high gain stage increase Typical error for 300nA is 1 LSB 10 Range 2 Low current shunt and 150nA 1 LSB 1 low gain stage Range 3 High current shunt and 10pA 1 LSB 1 high gain stage Range 4 High current shunt and 100pA 1 LSB 1 A
22. oltage mV uinti t 3000 Maximum Voltage mV uintt amp t 3600 Maximum Current mA uint16 t 0 3 4 Power Sources The SAM 121 Xplained Pro kit can be powered by several power sources listed in Table 3 3 Power Sources for SAM L21 Xplained Pro on page 10 Table 3 3 Power Sources for SAM L21 Xplained Pro External power Connector marking Current requirements PWR Voltage requirements 2 100 for Recommended USB host operation 4 3V to 5 5V if USB host operation is not required 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 4 4V to 5 25V according 500 according to to USB spec USB spec to 5 25 according 500 according to to USB spec USB spec Embedded debugger DEBUG USB USB Target USB TARGET USB The kit will automatically detect which power sources are available and choose which one to use according to the following priority 1 External power 2 Embedded Debugger USB 3 Target USB Info External power is required when 500mA from a USB connector is not enough to power the board with possible extension boards A connected USB device in a USB host application might easily exceed this limit Atmel SAM 121 Xplained Pro USER GUIDE 10 Atmel 42405B SAM L21 Xplained Pro Use
23. r Guide 07 2015 Atmel 3 5 Xplained Pro Standard Headers and Connectors 3 5 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 11 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 numer Name 0000 1 2 3 10 11 12 13 14 15 16 17 18 19 20 Atmel ID GND ADC ADC GPIO1 GPIO2 PWM PWM IRQ GPIO SPI SS B GPIO 2 SDA Grocer UART_RX UART_TX SPI SS A SPI MOSI SPI MISO SPI SCK GND VCC Communication line to the ID chip on an extension board Ground Analog to digital converter alternatively positive part of differential ADC Analog to digital converter alternatively negative part of differential ADC General purpose General purpose I O Pulse width modulation alternatively positive part of differential PWM Pulse width modulation alternatively negative part of differential PWM Interrupt request line and or general purpose I
24. t to make changes to specifications and products descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life SAFETY CRITICAL MILITARY AND AUTOMOTIVE APPLICATIONS DISCLAIMER Atmel products are not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death Safety Critical Applications without an Atmel officer s specific written consent Safety Critical Applications include without limitation life support devices and systems equipment or systems for the operation of nuclear facilities and weapons systems Atmel products are not designed nor intended for use in military or aerospace applications or environments unless specifically designated by Atmel as military grade Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive grade
25. text as AO9 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 indentifier for SAM L21 Xplained Pro is A09 2241 5 4 Revision 4 The device on revision 4 of the kit has been changed from ATSAML21J18A AUT to ATSAML21J18B AUT 5 3 Revision 3 Revision 3 and previous revisions use ATSAML21J18A AUT as the main device The extra crystal footprint connected to PA14 and PA15 described in Crystals on page 17 is not present on this revision Atmel Atmel SAM 121 Xplained Pro USER GUIDE 22 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 6 Document Revision History Doc rev Date Comment 42405B 07 2015 Updated for revision 4 of the kit 42405A 02 2015 Initial document release Atmel Atmel SAM 121 Xplained Pro USER GUIDE 23 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 T 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 W
26. the internal pull up in the SAM L21 to use the button Table 4 9 Mechanical Buttons SAM L21 pin Silkscreen text Shared functionality RESET RESET 5 PA02 SWO EXT1 42 3 LED There is one yellow LED available on the SAM L21 Xplained Pro board that can be turned on and off The LED can be activated by driving the connected I O line to GND Table 4 10 LED Connection SAM 121 Function Shared functionality PB10 Yellow LEDO 4 2 4 QTouch Button There is one self capacitance button available on the SAM L21 Xplained Pro board that can be used as This QTouch button is intended to be driven by the built in Peripheral Touch Controller of the device A zero ohm resistor is added on the board to easily disconnect the onboard touch buttons from the extension header as the lines are shared between the two Note To get started with QTouch refer to Atmel Q Touch Library and Atmel Q Touch Composer Table 4 11 QTouch Connection SAM L21 pin Silkscreen text Shared functionality PA10 QT BTN1 EXT2 4 2 5 Backup Battery The SAM L21 Xplained Pro has a backup battery for use with the SAM L21 backup module The battery can be connected to the device by placing a jumper over pin 1 2 on the 3 pin VBAT SELECT header Atmel Atmel SAM 121 Xplained Pro USER GUIDE 18 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 By default the jumper is placed o
27. the peripherals are supplied directly by the regulator For this configurations place the jumper for I O peripherals into the BYPASS position and the for MCU into the MEASURE position 3 Peripherals measurement The XAM measures only the peripherals current while the MCU is directly supplied by the regulator For this configuration place the jumper for MCU into the BYPASS position and the I O jumper into the MEASURE position 4 MCU and peripherals measurement In this configuration both MCU and peripherals are measured by the XAM Place both jumpers on I O and MCU headers in the MEASURE position Atmel Atmel SAM 121 Xplained Pro USER GUIDE 21 Atmel 42405B SAM L21 Xplained Pro_User Guide 07 2015 5 Hardware Revision History and Known Issues 5 1 Identifying Product ID and Revision The revision and product indentifier 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
28. thereof Enabling Unlimited Possibilities AVR QTouch and others are registered trademarks or trademarks of Atmel Corporation in U S and other countries Microsoft Windows and Windows Vista are registered trademarks of Microsoft Corporation in U S and or other countries ARM is registered trademark of ARM Ltd Other terms and product names may be trademarks of others DISCLAIMER The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the righ
29. ver pin 2 3 to select the board power supply This configuration is selected to avoid draining the battery and can be used during development Table 4 12 VBAT SELECT Header 1 Power from battery 2 pin on SAM 121 3 Power from board supply 4 3 Embedded Debugger Implementation SAM L21 Xplained Pro contains an Embedded Debugger EDBG that can be used to program and debug the ATSAML21J18B 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 L21 GPIOs Atmel Studio can be used as a front end for the Embedded Debugger 4 31 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 T Table 4 13 SWD Connections SAM L21 pin Function Shared functionality PA30 SWD clock Cortex debug connector 1 SWD data Cortex debug connector 4 3 2 Virtual COM Port The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAML21J18B UARTS For further information on how to use the Virtual COM port see Embedded Debugger on page 7 Table 4 14 Virtual COM Port Connections SAM L21 pin Function Shared functionality PA22 SERCOMS3 PAD 0 UART TXD SAM L21 TX line 23 SERCOMS PAD 1 UART SAM L21 RX line 4 3 3
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