FCC ID: VW4A091784 ATMEGA256RFR2-XPRO

USER GUIDE Atmel ATMEGA256RFR2 Xplained Pro Preface The Atmel ATMEGA256RFR2 Xplained Pro evaluation kit is hardware platform to evaluate the ATmega256RFR2 microcontroller. Supported by the Atmel Studio integrated development platform, the kit provides easy access to the features of the Atmel ATmega256RFR2 and explains how to integrate the device in a customer 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 ATmega256RFR2. The Xplained Pro extension series evaluation kits offers additional peripherals to extend the features of the board and ease the development of customer designs. 42079C-MCU-05/2013 Table of Contents 3.4. Preface .......................................................................................... 1 Introduction .............................................................................. 3 1. 1.1. Features .............................................................................. 3 Kit overview ......................................................................... 3 1.2. 2. Getting started ......................................................................... 5 2.1. Quick-start ........................................................................... 5 2.2. Connecting the kit ................................................................. 5 2.3. Design documentation and related links ..................................... 5 3. Xplained Pro ............................................................................ 6 3.1. Embedded Debugger ............................................................. 6 3.2. Hardware identification system ................................................. 6 Power supply ....................................................................... 7 3.3. 3.3.1. Measuring ATmega256RFR2 power consumption ............ 7 Standard headers and connectors ............................................ 7 3.4.1. Xplained Pro extension header .................................... 7 Power header ........................................................... 8 3.4.2. 4. Hardware user guide .............................................................. 9 4.1. Connectors .......................................................................... 9 I/O extension headers ................................................ 9 4.1.1. 4.1.2. Other headers ........................................................ 12 Peripherals ......................................................................... 13 4.2.1. Crystals ................................................................. 13 4.2.2. Mechanical buttons .................................................. 13 LED ...................................................................... 13 4.2.3. RF ........................................................................ 13 4.2.4. 4.2.5. Temperature sensor ................................................. 14 Embedded Debugger implementation ...................................... 14 JTAG ..................................................................... 14 4.3.1. Virtual COM port ..................................................... 15 4.3.2. Atmel Data Gateway Interface ................................... 15 4.3.3. 5. Agency Certification .............................................................. 16 5.1. UNITED STATES (FCC) ....................................................... 16 European Union (ETSI) ........................................................ 16 5.2. List of Antennae tested with this product: ................................. 17 5.3. 6. Hardware revision history and known issues ........................ 18 6.1. Identifying product ID and revision .......................................... 18 6.2. Revision 3 .......................................................................... 18 7. Document revision history ..................................................... 19 8. Evaluation board/kit important notice .................................... 20 4.2. 4.3. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 2 1. 1.1 Introduction Features Atmel ATmega256RFR2 microcontroller Embedded Debugger (EDBG) USB interface Programming and debugging (target) through JTAG Virtual COM-port interface to target via UART Atmel Data Gateway Interface (DGI) to target via SPI or TWI Four GPIOs connected to target for code instrumentation Digital I/O Two mechanical buttons (user and reset button) One user LED Five extension headers Antenna One ceramic chip antenna (2450BM15A0015E) One SMA connector for external antenna Temperature sensor and EEPROM (AT30TSE758) Two possible power sources External power Embedded debugger USB 16MHz crystal 32kHz crystal 1.2 Kit overview The Atmel ATMEGA256RFR2 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel ATmega256RFR2. The kit offers a set of features that enables the ATmega256RFR2 user to get started using the ATmega256RFR2 peripherals right away and to get an understanding of how to integrate the device in their own design. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 3 Figure 1-1. ATMEGA256RFR2 Xplained Pro evaluation kit overview. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 4 2. 2.1 2.2 2.3 Getting started Quick-start 3 Steps to start exploring the Atmel Xplained Pro Platform Download and install Atmel Studio1. Launch Atmel Studio. Connect an USB cable to the DEBUG USB port. Connecting the kit When connecting Atmel ATMEGA256RFR2 Xplained Pro 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 and Windows 7. Once connected the green power LED will be lit and Atmel Studio will autodetect which Xplained Pro evaluation- and extension kit(s) that's connected. You'll be presented with relevant information like datasheets and kit documentation. You also have the option to launch Atmel Software Framework (ASF) example applications. The target device is programmed and debugged by the on-board Embedded Debugger and no external programmer or debugger tool is needed. Please refer to the Atmel Studio user guide2 for information regarding how to compile and program the kit. Design documentation and related links The following list contains links to the most relevant documents and software for the ATMEGA256RFR2 Xplained Pro. 1. Xplained Pro products 3 - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluation kits for 8- and 32-bit Atmel microcontrollers. It consists of a series of low cost MCU boards for evaluation and demonstration of features and capabilities of different MCU families. 2. ATMEGA256RFR2 Xplained Pro User Guide 4 - PDF version of this User Guide. 3. ATMEGA256RFR2 Xplained Pro Design Documentation 5 - Package containing schematics, BOM, assembly drawings, 3D plots, layer plots etc. 4. Atmel Studio 6 - Free Atmel IDE for development of C/C++ and assembler code for Atmel 5. microcontrollers. IAR Embedded Workbench 7 for Atmel AVR. This is a commercial C/C++ compiler that is available for 8-bit AVR. There is a 30 day evaluation version as well as a 4k code size limited kick-start version available from their website. 6. Atmel sample store 8 - Atmel sample store where you can order samples of devices. 1 http://www.atmel.com/atmelstudio 2 http://www.atmel.com/atmelstudio 3 http://www.atmel.com/XplainedPro 4 http://www.atmel.com/Images/Atmel-42079-ATMEGA256RFR2-Xplained-Pro_User-Guide.pdf 5 http://www.atmel.com/Images/Atmel-42079-ATMEGA256RFR2-Xplained-Pro_User-Guide.zip 6 http://www.atmel.com/atmelstudio 7 http://www.iar.com/en/Products/IAR-Embedded-Workbench/AVR/

8 http://www.atmel.com/system/samplesstore Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 5 3. 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 mounted on a Xplained Pro MCU board. This information is used to present relevant user guides, application notes, datasheets and example code through Atmel Studio. Available Xplained Pro MCU and extension boards can be purchased in the Atmel Web Store1. Embedded Debugger The ATMEGA256RFR2 Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board debugging. The EDBG is a composite USB device of 3 interfaces; a debugger, Virtual COM Port and Data Gateway Interface (DGI). In conjunction with Atmel Studio, the EDBG debugger interface can program and debug the ATmega256RFR2. On the ATMEGA256RFR2 Xplained Pro, the JTAG interface is connected between the EDBG and the ATmega256RFR2. The Virtual COM Port is connected to a UART port on the ATmega256RFR2 (see section Embedded Debugger implementation on page 14 for pinout), and provides an easy way to communicate with the target application through a simple terminal software. It offers variable baud rate, parity and stop bit settings. Note that the settings on the target device UART must match the settings given in the terminal software. The DGI consists of several physical data interfaces for communication with the host computer. Please, see section Embedded Debugger implementation on page 14 for available interfaces and pinout. Communication over the interfaces are bidirectional. It can be used to send events and values from the ATmega256RFR2, 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. The DGI uses a proprietary protocol, and is thus only compatible with Atmel Studio. The EDBG controls two LEDs on ATMEGA256RFR2 Xplained Pro, a power LED and a status LED. Table 3-1, EDBG LED control shows how the LEDs are controlled in different operation modes. Table 3-1. EDBG LED control Operation mode Normal operation Bootloader mode (idle) Bootloader mode (firmware upgrade) Power LED Power LED is lit when power is applied to the board. Status LED Activity indicator, LED flashes every time something happens on the EDBG. The power LED and the status LED blinks simultaneously. The power LED and the status LED blinks in an alternating pattern. For further documentation on the EDBG, see the EDBG User Guide. 3.2 Hardware identification system All Xplained Pro compatible extension boards have an Atmel ATSHA204 crypto authentication chip mounted. This chip contains information that identifies the extension with its name and some extra data. When an Xplained Pro extension board 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 shows the data fields stored in the ID chip with example content. Table 3-2. Xplained Pro ID chip content Data Field Manufacturer Product Name Product Revision Data Type ASCII string ASCII string ASCII string 1 http://store.atmel.com/

Example Content Atmel\0 Segment LCD1 Xplained Pro\0 02\0 Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 6 Data Field Product Serial Number Minimum Voltage [mV]

Maximum Voltage [mV]

Maximum Current [mA]

Data Type ASCII string uint16_t uint16_t uint16_t Example Content 1774020200000010\0 3000 3600 30 3.3 Power supply The ATMEGA256RFR2 Xplained Pro kit can be powered either by USB or by an external power source through the 4-pin power header, marked PWR. This connector is described in Power header on page 8. The available power sources and specifications are listed in Table 3-3, Power sources for ATMEGA256RFR2 Xplained Pro. Table 3-3. Power sources for ATMEGA256RFR2 Xplained Pro Power input External power Voltage requirements 4.3V to 5.5V Current requirements Recommended minimum is 500mA to be able to provide enough current for extentions and the board itself. Recommended maximum is 2A due to the input protection maximum current specification. 500 mA (according to USB spec) Connector marking PWR DEBUG USB Embedded debugger USB 4.4V to 5.25V

(according to USB spec) 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 3.3.1 Measuring ATmega256RFR2 power consumption As part of an evaluation of the ATmega256RFR2 it can be of interest to measure its power consumption. Because the device has a separate power plane (VCC_MCU_P3V3) on this board it is possible to measure the current consumption by measuring the current that is flowing into this plane. The VCC_MCU_P3V3 plane is connected via a jumper to the main power plane (VCC_TARGET_P3V3) and by replacing the jumper with an ampere meter it is possible to determine the current consumption. To locate the current measurement header, please refer to Figure 1-1, ATMEGA256RFR2 Xplained Pro evaluation kit overview.. Warning Do not power the board without having the jumper or an ampere meter mounted. This can cause the ATmega256RFR2 to be powered through its I/O pins and cause undefined operation of the device. 3.4 3.4.1 Standard headers and connectors Xplained Pro extension header All Xplained Pro kits have one or more dual row, 20 pin, 100mil extension headers. Xplained Pro MCU boards have male headers while Xplained Pro extensions have their female counterparts. Note that all pins are not always connected. However, all the connected pins follow the defined pin-out described in Table 3-4, Xplained Pro extension header. The extension headers can be used to connect a wide variety of Xplained Pro extensions to Xplained Pro MCU boards and to access the pins of the target MCU on Xplained Pro MCU board directly. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 7 Table 3-4. Xplained Pro extension header Pin number 1 2 3 Name ID GND ADC(+) 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3.4.2 ADC(-) GPIO1 GPIO2 PWM(+) PWM(-) IRQ/GPIO SPI_SS_B/GPIO TWI_SDA TWI_SCL USART_RX USART_TX SPI_SS_A SPI_MOSI SPI_MISO SPI_SCK GND VCC Description Communication line to the ID chip on 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 IO General purpose IO Pulse width modulation , alternatively positive part of differential PWM Pulse width modulation , alternatively positive part of differential PWM Interrupt request line and/or general purpose IO. Slave select for SPI and/or general purpose IO. Data line for two wire interface. Always implemented, bus type. Clock line for two wire interface. Always implemented, bus type. Receiver line of Universal Synchronous and Asynchronous serial Receiver and Transmitter Transmitter line of Universal Synchronous and Asynchronous serial Receiver and Transmitter Slave select for SPI. Should be unique if possible. 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 Power header The power header can be used to connect external power to the ATMEGA256RFR2 Xplained Pro kit. The kit will automatically detect and switch to the 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 for the 3.3V regulated output. To locate the current measurement header, please refer to Figure 1-1, ATMEGA256RFR2 Xplained Pro evaluation kit overview. Table 3-5. Power header PWR Pin number PWR header 1 2 3 Pin name VEXT_P5V0 GND VCC_P5V0 Description External 5V input Ground Unregulated 5V (output, derived from one of the input sources) Regulated 3.3V (output, used as main power for the kit) 4 VCC_P3V3 Note If the board is powered from a battery source it is recommended to use the PWR header. If there is a power source connected to EDBG USB, the EDBG is activated and it will consume more power. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 8 4. 4.1 4.1.1 Hardware user guide Connectors This chapter describes the implementation of the relevant connectors and headers on ATMEGA256RFR2 Xplained Pro and their connection to the ATmega256RFR2. The tables of connections in this chapter also describes which signals are shared between the headers and on-board functionality. I/O extension headers The ATMEGA256RFR2 Xplained Pro headers EXT1, EXT2, EXT3, EXT4 and EXT5 offers access to the I/O of the microcontroller in order to expand the board e.g. by connecting extension modules to the board. These headers all comply with the standard extension header specified in Xplained Pro Standard Extension Header. All headers have a pitch of 2.54 mm. Table 4-1. Extension header EXT1 Pin on EXT1 1 ATmega256RFR2 pin 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PF0 PF1 PE2 PE3 PB5 PB6 PE5 PD5 PD1 PD0 PE0 PE1 PG0 PB2 PB3 PB1 Table 4-2. Extension header EXT2 Pin on EXT2 1 ATmega256RFR2 pin 2 Function Communication line to ID chip on extension board. GND ADC0 ADC1 GPIO GPIO OC1A OC1B GPIO / INT5 GPIO / SPI chip select B TWI SDA TWI SCL UART0 RXD UART0 TXD GPIO / SPI chip select A SPI MOSI SPI MISO SPI SCK GND VCC Function Communication line to ID chip on extension board. GND Shared functionality EXT4 header. EXT4 header. EXT4 header. All EXT headers. All EXT headers. All EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. All EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. EXT4 header. All EXT headers. All EXT headers. All EXT headers. Shared functionality Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 9 Pin on EXT2 3 4 5 6 7 8 9 10 11 12 13 ATmega256RFR2 pin PE6 PD6 PD1 PD0 PE01 Function GPIO / INT6 GPIO / SPI chip select B TWI SDA TWI SCL UART0 RXD 14 15 16 17 18 19 20 Notes:

PE11 PD4 PB2 PB3 PB1 1Connected through cut-strap Table 4-3. Extension header EXT3 Pin on EXT3 1 ATmega256RFR2 pin 2 3 4 5 6 7 8 9 10 11 12 13 14 PF3 PG5 PB7 PE7 PD7 PD1 PD0 PE01 PE11 UART0 TXD GPIO / SPI chip select A SPI MOSI SPI MISO SPI SCK GND VCC Function Communication line to ID chip on extension board. GND GPIO GPIO GPIO GPIO / INT7 GPIO / SPI chip select B TWI SDA TWI SCL UART0 RXD UART0 TXD Shared functionality EXT5 header. EXT5 header. All other EXT headers. All other EXT headers. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. EXT5 header. All other EXT headers. All other EXT headers. All other EXT headers. Shared functionality All other EXT headers. All other EXT headers. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. All other EXT headers. EXT2, EXT3 and EXT5 Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 10 Pin on EXT3 ATmega256RFR2 pin Function 15 16 17 18 19 20 Notes:

PG4 PB2 PB3 PB1 1Connected through cut-strap Table 4-4. Extension header EXT4 Pin on EXT4 1 ATmega256RFR2 pin 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PB5 PE5 PG0 PD1 PD0 PE0 PE1 PD5 PB2 PB3 PB1 Table 4-5. Extension header EXT5 Pin on EXT5 1 ATmega256RFR2 pin 2 3 GPIO / SPI chip select A SPI MOSI SPI MISO SPI SCK GND VCC Function Communication line to ID chip on extension board. GND OC1A GPIO / INT5 GPIO / SPI chip select B TWI SDA TWI SCL UART0 RXD UART0 TXD GPIO / SPI chip select A SPI MOSI SPI MISO SPI SCK GND VCC Function Communication line to ID chip on extension board. GND Shared functionality connected through cut-

strap. All other EXT headers. All other EXT headers. All other EXT headers. Shared functionality EXT1 header. EXT1 header. EXT1 header. All other EXT headers. All other EXT headers. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. EXT1 header. All other EXT headers. All other EXT headers. All other EXT headers. Shared functionality Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 11 Pin on EXT5 4 5 6 7 8 9 10 11 12 13 ATmega256RFR2 pin PE6 PD4 PD1 PD0 PE01 Function GPIO / INT6 GPIO / SPI chip select B TWI SDA TWI SCL UART0 RXD 14 PE11 UART0 TXD Shared functionality EXT2 header. EXT2 header. All other EXT headers. All other EXT headers. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. All other EXT headers. EXT2, EXT3 and EXT5 connected through cut-

strap. EXT2 header. All other EXT headers. All other EXT headers. All other EXT headers. PD6 PB2 PB3 PB1 GPIO / SPI chip select A SPI MOSI SPI MISO SPI SCK GND VCC 15 16 17 18 19 20 Notes:

Other headers In addition to the I/O extension headers on page 9, ATMEGA256RFR2 Xplained Pro has additionally two headers with spare signals which offers access to the I/O of the microcontroller which are otherwise not easily available elsewhere or might be favourable to have collected toghether. All headers have a pitch of 2.54mm. Table 4-6. SPARE ADC signals header Pin on header 1Connected through cut-strap Shared functionality Function 4.1.2 ATmega256RFR2 pin

PF4 PF5 PF6 PF7 1 2 3 4 5 Notes:

Table 4-7. SPARE signals header 2 Pin on header VCC (3.3V) ADC41 ADC51 ADC61 ADC71 JTAG Interface, TCK JTAG Interface, TMS JTAG Interface, TDO JTAG Interface, TDI 1These lines are connected to the JTAG interface, and ADC will not work properly while debugging or programming the kit. 1 2 3 4 5 ATmega256RFR2 pin AREF TST RSTN RSTON CLKI Function Shared functionality Analog reference Test pin for RF test mode Reset Reset status Alternative main clock input EDBG and RESET button Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 12 Pin on header 6 ATmega256RFR2 pin Function Shared functionality GND 4.2 4.2.1 Peripherals Crystals The ATMEGA256RFR2 Xplained Pro kit contains two crystals that can be used as clock sources for the ATmega256RFR2 device. Each crystal has a cut-strap next to it that can be used to measure the oscillator allowance. This is done by cutting the strap and adding a resistor across the strap. More information about oscillator allowance and safety factor can be found in appnote AVR41001 Table 4-8. External 32.768kHz crystals Pin on ATmega256RFR2 PG3 PG4 Table 4-9. External 16MHz crystals Pin on ATmega256RFR2 XTAL1 XTAL2 Function TOSC2, crystal output TOSC1, crystal input Function Crystal input Crystal output 4.2.2 Mechanical buttons ATMEGA256RFR2 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the ATmega256RFR2 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. Table 4-10. Mechanical buttons Pin on ATmega256RFR2 RSTN PE4 Silkscreen text RESET SW0 4.2.3 LED There is one yellow LED available on the ATMEGA256RFR2 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 4-11. LED connections Pin on ATmega256RFR2 PB4 LED Yellow LED 4.2.4 RF The main feature of ATMEGA256RFR2 Xplained Pro is to show the RF capability of the ATmega256RFR2 device. This device has bidirectional differential antenna pins, which are fed through a balun (Johanson Technology, 2450BM15A00152) to create a single unbalanced output/input. This kit has a passive analog RF switch (Skyworks Solutions Inc, AS222-92LF3) connected to the unbalanced output of the balun. The switch is driven by the DIG1 and DIG2 pins of the ATmega256RFR2 which feature Antenna Diversity to enable the device to automatically select the best signal from two antennas (can also be selected manually). The output of the switch is connected to a ceramic chip antenna (Johanson Technology, 2540AT18D01004) and a SMA connector for external antennas. 1 http://www.atmel.com/images/doc8333.pdf 2 http://www.johansontechnology.com/datasheets/balun-filter/2450BM15A0015.pdf 3 http://www.skyworksinc.com/uploads/documents/200252C.pdf 4 http://www.johansontechnology.com/images/stories/ip/rf-antennas/Antenna_2450AT18D0100_v3.pdf Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 13 Table 4-12. RF connections Pin on ATmega256RFR2 RFP RFN RF balanced output (Positive) RF balanced output (Negative) 4.2.5 Temperature sensor ATMEGA256RFR2 Xplained Pro features an Atmel AT30TSE758 temperature sensor chip with an 8kbit serial EEPROM inside. The sensor includes programmable high and low temperature alarms, user-selectable temperature resolution up to 12 bits, and an I2C/SMBus compatible serial interface. Pin name Table 4-13. Temperature sensor connections. Pin on AT30TSE758 temperature ATmega256RFR2 sensor pin 1 2 3 4 5 6 7 8 Notes:

SDA SCL ALERT GND A2 A1 A0 VCC PD1 PD0 NC1 GND

VCC 1Alert pin is available on a testpoint hole close to the sensor. Comment Data line of serial interface Clock line of serial interface Temperature alarm signalling pin Addres line for serial interface, by default pulled low Addres line for serial interface, by default pulled high Addres line for serial interface, by default pulled high The temperature sensor has two TWI addresses, one for the temperature sensor and one for the EEPROM. The addresses are "0b1001 A2 A1 A0" for the temperature sensor and "0b1010 A2 A1 A0" for the EEPROM. The address selection lines (A2, A1 and A0) of the temperature sensor chip is by default pulled high for A0 and A1 and low for A2, through 100k resistors, which makes the default addresses 0b1001011 and 0b1010011. Soldering the the straps on the front of the ATMEGA256RFR2 Xplained Pro board for An will alter that bit in the address to low or high. Each strap is marked in silkscreen with A0, A1 and A2 as shown in Figure 4-1, Temperature sensor TWI address.. When communicating with the EEPROM, part of the TWI address is used as a page address, for more details see the device datasheet5. Figure 4-1. Temperature sensor TWI address. 4.3 Embedded Debugger implementation The ATMEGA256RFR2 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the ATmega256RFR2 using JTAG. The Embedded Debugger also include a Virtual Com port interface over UART, an Atmel Data Gateway Interface over SPI and TWI and it monitors four of the ATmega256RFR2 GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger. 4.3.1 JTAG The JTAG use five 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 6. 5 http://www.atmel.com/Images/doc8751.pdf Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 14 Table 4-14. JTAG connections. Pin on ATmega256RFR2 PF4 PF5 PF6 PF7 RSTN Function JTAG TCK JTAG TMS JTAG TDO JTAG TDI RESET 4.3.2 Virtual COM port The Embedded Debugger act as a Virtual Com Port gateway by using one of the ATmega256RFR2 UARTs. For further information on how to use the Virtual COM port see Embedded Debugger on page 6. Table 4-15. Virtual COM port connections. Pin on ATmega256RFR2 PD2 PD3 Function UART RXD (ATmega256RFR2 RX line) UART TXD (ATmega256RFR2 TX line) 4.3.3 Atmel Data Gateway Interface The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a SPI or TWI port. The DGI can be used to send a variety of data from the ATmega256RFR2 to the host PC. For further information on how to use the DGI interface see Embedded Debugger on page 6. Table 4-16. DGI interface connections when using SPI. Pin on ATmega256RFR2 PB0 PB1 PB2 PB3 Function Slave select (ATmega256RFR2 is Master) SPI SCK (Clock Out) SPI MOSI (Master Out, Slave in) SPI MISO (Master In, Slave Out) Table 4-17. DGI interface connections when using TWI. Pin on ATmega256RFR2 PD0 PD1 Function SCL (Clock line) SDA (Data line) 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 ATmega256RFR2 application code. For further information on how to configure and use the GPIO monitoring features see Embedded Debugger on page 6. Table 4-18. GPIO lines connected to the EDBG. Pin on ATmega256RFR2 PE2 PE3 PE5 PE6 Function GPIO0 GPIO1 GPIO2 GPIO3 Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 15 5. 5.1 Agency Certification UNITED STATES (FCC) This equipment complies with Part 15 of the FCC rules and regulations. To fulfill FCC Certification requirements, an OEM manufacturer must comply with the following regulations:

1. This equipment (ATMEGA256RFR2 Xplained Pro) is for use for evaluation purposes only and must not be incorporated into any other device or system. Important This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation (FCC 15.19). The internal / external antenna(s) used for this mobile transmitter must provide a separation distance of at least 20 cm from all persons and must not be colocated or operating in conjunction with any other antenna or transmitter. Installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance. This device is approved as a mobile device with respect to RF exposure compliance, and may only be marketed to OEM installers. Use in portable exposure conditions (FCC 2.1093) requires separate equipment authorization. Important Modifications not expressly approved by this company could void the user's authority to operate this equipment (FCC section 15.21). Important This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense

(FCC section 15.105). 5.2 European Union (ETSI) The ATMEGA256RFR2 Xplained Pro Evaluation kits has been certified for use in European Union countries. A Declaration of Conformity must be issued for each of these standards and kept on file as described in Annex II of the R&TTE Directive. Furthermore, the manufacturer must maintain a copy of the modules' documentation and ensure the final product does not exceed the specified power ratings, antenna specifications, and/or installation requirements as specified in the user manual. If any of these specifications are exceeded in the final product, a submission must be made to a notified body for compliance testing to all required standards. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 16 Important The 'CE' marking must be affixed to a visible location on the OEM product. The CE mark shall consist of the initials "CE" taking the following form:

The CE marking must have a height of at least 5mm except where this is not possible on account of the nature of the apparatus. The CE marking must be affixed visibly, legibly, and indelibly. More detailed information about CE marking requirements you can find at "DIRECTIVE 1999/5/

EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL" on 9 March 1999 at section 12. 5.3 List of Antennae tested with this product:

Table 5-1. List of tested Antennae Antenna Number Make Model/Part #

Antenna 1 Antenna 2 Johanson Technology Techfun Co., Ltd 2450AT18D0100 Antenna Gain

(dBi) 1.5dBi Type of Antenna Ceramic Antenna M01-SS2 0dBi External Antenna Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 17 6. 6.1 Hardware revision history and known issues Identifying product ID and revision The revision and product identifier of Xplained Pro boards can be found in two ways, through Atmel Studio or by looking at the sticker on the bottom side of the PCB. By connecting a Xplained Pro MCU board to a computer with Atmel Studio running, an information window will pop up. The first 6 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 Kits 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 kit identifier for ATMEGA256RFR2 Xplained Pro is 1784. 6.2 Revision 3 Revision 3 of ATMEGA256RFR2 Xplained Pro is the initial released version. Known issues The low and high byte of the 16-bit CRC value of the information in the user page might be swapped on serial numbers prior to 1885. Workaround: If it is neccssary to use the CRC value to verify the data in the user page, compare the calculated value with both the swapped and non-swapped version of the CRC value present in the user page. Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 18 7. Document revision history Doc. Rev. C B A Date 21.05.2013 24.04.2013 25.02.2013 Comment Added chapter 5.3: "Antennae tested with this product"

Added Agency Certification chapter First release Atmel ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 19 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 ATMEGA256RFR2 Xplained Pro [USER GUIDE]

42079C-MCU-05/2013 20 Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200

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