Atmel AT04467: Wireless SoC Reference Design with RFMDs RF6555
Contents
1. 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 right 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 A2. RF6555 ATMmega256 Referenceboard Layer Stack Up Note It is highly recommended to follow the PCB layout as close as possible Deviations from the layout can alter the performance of the reference design e Shielding The reference design does not contain a metal shield However it might be necessary to protect the ICs from external noise and strong interference Such shields may suppress radiated harmonics from the reference design but is not necessary The recommended size for the metal shield is 30mm x 25mm e RF Layout Optimization The RF6555 ground pad contains a 4 x 4 via pattern See Figure 4 2 with through hole vias that route from the top layer to the bottom layer The size of via hole is 12mils and the diameter is 24mils These specifications enhance thermal dissipation and provides a short return path for the signal In the final product the solder mask or solder resist can be removed from the bottom layer beneath the ground pad for improved thermal dissipation Figure 4 2 RF6555 Ground Slug Via Pattern RF6555 ATmega256 Reference Design Application Note 3 Atmel 42262A WIRELESS 04 2014 5 Evaluation and Configuration Equipment needed for evaluation e Atmel RCB Sensor Terminal Board STB 6 Signal or Spectrum analyzer for conducted measurements Computer with a terminal emulator application SMA MS 147 Cables 2 USB cable if using STB Power meter Evaluation Board The RF6555 ATmega256 Referenceboard is
3. 15 35 Section 15 205 Section 15 209 Section 15 231 RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 Atmel 6 Sensor terminal board www dresden elektronik de funktechnik service download documentation L 1 c3646 Atmel RF6555 ATmega256 Reference Design Application Note 17 42262A WIRELESS 04 2014 8 Revision History Comments Rev A 04 2014 Initial document release 18 RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 Atmel Altmel Enabling Unlimited Possibilities OnE o wv Atmel Corporation 1600 Technology Drive San Jose CA 95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2014 Atmel Corporation Rev A Atmel 42262A WIRELESS RF6555 ATmega256 Reference Design ApplicationNote_04 2014 Atmel Atmel logo and combinations thereof AVR Enabling Unlimited Possibilities and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries 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
4. automatically download the necessary driver from www ftdichip com Products ICs FT245R htm After installing the driver note the COM port number assigned for the device Illustrated in Figure 5 2 Figure 5 2 Device Manager after Driver Installation 24 Device Manager p PE P a File Action View Help 209 n 0 e m ees gt DVD CD ROM drives gt G IDE ATA ATAPI controllers gt IEEE 1394 Bus host controllers J a Jungo gt gt Keyboards gt Mice and other pointing devices gt es Modems gt M Monitors gt EP Network adapters gt fh Other devices gt JE PCMCIA adapters 4 Portable Devices JF Ports COM amp LPT 1 19 Communications Port COM1 gt Printer Port LPT1 17 SensTermBoard COM39 gt TE Processors dl SD host adapters gt JP Security Devices 5 The maximum current is limited to 400mA by the on board voltage regulator in the Sensor Terminal Board An external power source is not required to achieve full RF power using the RF6555 ATmega256 Figure 5 3 USB Port Settings SensTermBoard COM39 Properties mes At L RF6555 ATmega256 Reference Design Application Note 5 me 42262A WIRELESS 04 2014 6 Configure the following settings in the relevant COM port Port Settings tab in Figure 5 3 Baud Bits per second 9600 Parity None Data Bits 8 Stop Bits 1 Flow Control None 7 To establish a connection between the RF6555 ATmega256 Referenc
5. evaluated on the Atmel RCB Sensor Terminal Board Figure 5 1 The Sensor Terminal Board STB establishes a USB based UART connection programming interfaces and provides RCB power supply using the USB cable Ordering information for the STB descriptions technical data documentation and drivers are available at http www dresden elektronik de funktechnik products boards and kits developoment boards Figure 5 1 Sensor Terminal Board nr Sencer terkis Bar d 7 e add sg pa EEE eo ae a Amide sphas wh ir KE reser alet br ona I a AE T i NT 7 E GEEZ 7 EG ne vsert Configuration To configure the RF6555 ATmega256 Referenceboard mounted on the STB connect the STB and the host computer using a USB cable RCBs may be evaluated using on board antennas A1 and A2 or by placing SMA connectors on J1 MS 147 for Antenna 1 or X1 for Antenna 2 Note RF6555 ATmega256 Referenceboards are shipped with connector X1 out of circuit To evaluate the demo board using connector X1 e populate R14 with a Oohm 0402 resistor e remove resistor R13 located between X1 and balun 4 RF6555 ATmega256 Reference Design Application Note Atmel 42262A WIRELESS 04 2014 Steps for installing and configuring the demo board If you are using a Sensor Terminal Board connect the cable to X2 of the STB Depending on your operating system the driver software for the STB may automatically install If the installation does not start
6. 555 ATmega256 Referenceboards are equipped with two PCB antennas A1 and A2 used for antenna diversity for over the air testing A SMA female connector X1 which is Digi Key P N J500 ND is used for conducted measurements Supports conducted testing using J1 an MS 147 receptacle which is Digi Key P N H2800DKR ND that mates to Digi Key P N H2802 ND 4 Mechanical Descriptions The RF6555 ATmega256 Referenceboard contains a 4 layer design on standard FR4 material S400 with a total thickness of 66 mils It can be designed on a 2 layer board 4 The top and bottom layers are large copper planes with their grounds stitched together with through hole vias placed close to the GND pins of critical RF components 4 1 The top layer contains a solid 10z base copper and plating for digital ground plane It is used for RF and digital signal routing and contains an isolation between the digital and RF traces 2 The middle layer 1 is a solid digital ground 3 The middle layer 2 is an internal layer and a solid power plane with nets to VCC and V_RCB The power plane should be surrounded with through hole ground vias that connect the ground layers 2 RF6555 ATmega256 Reference Design Application Note Atmel 42262A WIRELESS 04 2014 4 The bottom layer is a digital ground plane shared with RF and made using solid 10z base copper and plating The filter balun B1 requires a solid ground connection See Figure 4 1 for layer stack up details Figure 4 1
7. A WIRELESS 04 2014 10 Select the antenna for reception by pressing Q followed by C and then 2 or 3 Refer Figure 5 11 Figure 5 11 Terminal Screens after Receiver Configuration r f RF SSSATMEGA2ZS6RFR2 TX HyperTerminal am z amp RFOSSSATMEGAZSERFR2 RX HyperTerminal File Edt View Call Transfer Help Fie Edt View Call Transfer Help f i 5 Start test gt Frames received on air PER Measurement mode Peer device foun Results from RX node Starting PER elr mode as Reflector Diversity is enabled Channel changed t Press C to change or any _ to accept setting Tx Power set to 18 dBm TX PHR xa on the n To change configuration press Antenna diversity disabled and antenna selected is A1 X2 1 gt enable diversity 2 gt disable diversity and use AL X2 3 gt disable diversity and use A2 X3 Any key to exit Diversity paramters set successfully on remote node Software Version 4 Performance test application ATmega256RFR2 FEM Main and Sub menu 3 PER Test Configuration Number of test frames 100 Frame length PSDU 20 Diversity settings on remote node CRC settings on remote node Leave sub menu oi teat Connected 0 21 14 Auto detect 96008 N 1 NUM Connected 0 22 27 Auto detect 9600 8 N 1 NUM Transmitter Terminal Receiver Terminal In the main menu press 5 and the text Transmitting Wait until test is completed is displayed on the screen The main screen displays the numb
8. Atmel APPLICATION NOTE Atmel AT04467 Wireless SoC Reference Design with RFMDs RF6555 Atmel MCU Wireless Description The RF6555 ATmega 256 Referenceboard is a reference design developed by the partnership between RFMD and Atmel Corporation This design presents a complete solution using a 2 4GHz ZigBee IEEE 802 15 4 based compliant radio transceiver solution that conforms to FCC CFR47 part 15 Atmel introduces the ATmega256RFR2 as its ZigBee platform which features a low power 2 4GHz radio frequency transceiver and a high performance low power AVR 8 bit microcontroller delivered as a 9mm x9 mm x 0 9mm 64 pin QFN package RFMD presents a world class Front End Module FEM the RF6555 for efficient extended output power beyond 18dBm with harmonic filtering diversity switch and LNA with bypass Features Output power 18dBm 0 063 Watt Industry leading 129dB link budget Low harmonic content Antenna diversity RoHS compliant Single differential bidirectional TX RX interface 42262A WIRELESS 04 2014 1 Overview This application note provides information about the evaluation and analysis of the data and design tools for implementing a ZigBee solution using the RF6555 ATmega256 Reference board The RF6555 2 FEM is a medium power 14 to 18dBm Smart Energy front end solution available on a single chip It integrates the PA with harmonic filtering LNA with bypass SPDT switch for TX RX functionality DP2T swi
9. LEEP TRA OFF enabled PLL OM disabled RK disabled TK Continuous Antenna diversity enabled Toggle FEM control enabled Leave sub menu 7 ee ja ja gj a a EE Te mm VE ee ee tt ht alt Hasta a ass ess Connected 0 09 06 Auto detect 9600 8 N 1 SCRO CAPS Capture Print echo 7 Set Antenna diversity if it has not been configured earlier This setting can be configured similar to the Transceiver Configuration menu 8 Press U to start transmission Select C for continuous waveform or Select P for modulated Pseudo Random Binary Sequence waveform The demo board is transmitting a signal 9 Press any key to terminate transmission 5 2 Packet Error Rate PER Evaluation Two RF6555_ATmega256_Referenceboards are required to perform PER testing The setup is shown in Figure 5 7 One board acts as a transmitter and requires a computer terminal Another board acts as receiver for which a computer terminal is optional 8 RF6555 ATmega256 Reference Design Application Note Atmel 42262A WIRELESS 04 2014 Atmel Figure 5 7 PER Test Setup Block diagram of PER test setup PC running Performance Transmitter test application Everything in the box indicates inside a screen Shielded room Variable Attenuator D Coaxial cable to ANT er f i e j O I a fs f o gt g J s 5 i CY o La J 44 Lo Cable RF6555 ATMega256 Refe
10. RFOSSSATMEGA2S6RFR2 TX HyperTerminal e 8 z EI RFGSSSATMEGA2S6RFR2 RX HyperTerminal o Z File Edit View Call Transfer Help Fie Edt View Call Transfer Help D 83 05 f Ose 823 05 amp CSMA enabled false Antenna diversity enabled Toggle FEM control enabled 0 Leave sub menu 5 Start test aoe antenna gt Enter 1 for AL X or 2 for A2 3 Frames received on air PER Measurement mode Peer device foun Starting PER owt ras mode as Reflector hannel changed to 1 Tx Power set to 18 dBm TX_PWR 0xa on the node Software Version 4 0 Performance test application ATmega 56RFR2 FEM Hain and Sub menu 1 Transceiver P Y RET A annel Channel page 0 Receiver Desensitization disabled Tx power 18 dBm TX PWR xa ACK request false Frame retry enabled true CSMA enabled false Antenna diversity disabled and antenna selected is AL X2 Toggle FEM control enable Leave sub menu 5 Start _test C P or lt zxznD lt a gt Connected 00711 Auto detect 9600 8 N 1 NUM Transmitter Terminal Receiver Terminal 8 Press O to return to Main menu Then press 3 to enter the PER Test Configuration menu 9 Setthe number of packets frames for transmission The default number is 100 To change the number of packets press N specify the number and press Enter 10 RF6555 ATmega256 Reference Design Application Note Atmel 42262
11. TER to Abort Search for Peer Device and to start single node operation m Peer device foun ode Starting PER Measurement mode as Reflector Search for Peer device initiated Peer device foun Starting PER Measurement mode as Transmitter Software Version 4 0 Performance test application ATmega256RFR2 FEM Main menu 1 Transceiver Configuration 2 Transceiver State Selection EE R Test Configuration Service Functions Start test Connected 0 01 32 Auto detect 96008 N 1 NUM Connected 0 0233 Auto detect 9600 8 N 1 Transmitter Terminal Receiver Terminal 2 Setthe Channel number to the channel to test The default is Channel 21 To change the channel press C Type the two digit channel number 11 26 and press Enter 3 Set the transmit power level The default power level is 20dBm a Press W to change the power level b Press A for absolute and type the power level in dBm or c Press R for register value type a two digit hexadecimal value 00 0F and press Enter Press A to Toggle ACK request until it reads no ACK requested Press F to Toggle Frame retry until it reads false Press M to Toggle CSMA enabled until it reads false Select the antenna for transmission Toggle the antenna by pressing Y To validate disable antenna diversity in a Receiving antenna and select that particular antenna Figure 5 10 NMR Figure 5 10 Terminal Screens after Transceiver Configuration 57 f i
12. eboard and enable the test menu options configure the terminal emulator application with the COM port settings specified in previous step 8 Press any key send ASCII character to establish communication with the RF6555 ATmega256 Referenceboard Note After establishing a connection with the computer terminal the RF6555 ATmega256 Referenceboard searches for a peer device This feature allows the remote RF6555 ATmega256 Referenceboard to operate without a computer terminal For transmission performance testing single node mode press the Enter key on the computer to skip this search The main menu for the Transmission Performance Evaluation section is displayed as shown in Figure 5 4 If a peer device is detected both the devices assume PER testing mode Screen is displayed as in Figure 5 9 The Transmitter Terminal screen is the main menu for the PER Evaluation section Figure 5 4 RF6555 ATmega256 Referenceboard Terminal Emulator Main Menu E RF6555ATMEGA256RFR2 TX HyperTerminal File Edit View Call Transfer Help Character received on UART PER Measurement mode Ar ENTER to Abort Search for Peer Device and to start single node operation m ode Search for Peer device initiated Search for Peer Device aborted Starting Performance Test Application in single node operation mode Software Yersion 4 6 Performance test application ATmega256RFR2 FEM Hain menu 1 Transceiver Configuration 2 Transceiver State Selection 3 Ser
13. er of packets frames received This defines your PER value See Figure 5 12 for more information For example 1000 1000 equates to a 0 PER 990 1000 equates to 1 PER Average PER lt 1 at 100dBm Figure 5 12 Terminal Screens after PER Test Transmission E RFGSSSATMEGA2S6RFR2 RX HyperTerminal o amp x4 File Edit View Call Transfer Help Ose 83 05 amp a RFGSSSATMEGA2S6RFR2 TX HyperTerminal File Edit View Call Transfer Help Os 83 08 amp finy key to exit Diversity paramters set successfully on remote node Frames received on air PER Measurement mode u Peer device foun Starting PER k pe mode as Reflector Channel changed to 1 Tx Power set to 18 ie TX PUR xa on the node Antenna diversity disabled and antenna selected is A1 X2 Receiving Number of received frames 100 average LOI 254 average RSSI 54 dBm Sof tware Varalan 4 o Performance test application ATmega256RFR2 FEM Main and Sub menu 3 PER Test Configuration N Number of test frames 100 L Frame length PSDU 20 0 Diversity settings on remote node 2 CRC settings on remote node 0 Leave sub menu 5 Start_test gt Transmitting Wait until test is completed Done Test result Test duration 9 099504 s Transmitted frames 100 invalid frames 0 Net data rate 160 80 kbit s Results from RX node Number of received frames 100 average LOI 254 average RSSI 54 dBm Press any key to con
14. l Leave sub menu Auto detect 9600 8 N 1 SCRO CAPS Capture Print echo 2 Set the channel number for the channel to be tested By default channel 21 is tested To change the default channel press C type channel number 11 26 and press Enter 3 Set the Transmission Power level The default is 20dBm a Press W to change the power level b Press A for absolute and type the power level in dBm or c Press R for register value type a two digit hexadecimal value 00 0F and press Enter 4 Press Y to select antenna and enter 1 or 2 Press Y again to re enable Antenna diversity wherein both antennas are used Note Antenna diversity should be disabled while validating only one antenna 5 Press O to exit the Transceiver Configuration menu 6 From the Main menu press 2 to enter Transceiver State Selection menu Figure 5 6 RF6555 ATmega256 Reference Design Application Note 7 Atmel i 42262A WIRELESS 04 2014 Figure 5 6 Transceiver State Selection Menu Screen E RF6555ATMEGAZ256RFR2 TX HyperTerminal File Edit View Call Transfer Help Software Version 4 6 Performance test application ATmega 5S6RFR2 FEM Hain menu 1 Transceiver Configuration 2 Transceiver State Selection 3 Service Functions gt Software Version 4 6 Performance test application ATmega 5S6RFR2 FEM Sub menu 2 Transceiver State Selection Present Ir State TRA OFF Receiver Desensitization disabled RESET S
15. nalyzer e When using a spectrum analyzer ensure that you use a wide RBW i e 3MHz and set detector to average Perform this for every channel being measured For each coaxial cable record the insertion loss at 2 4GHz and the value of the attenuator s Refer to Figure 5 7 which illustrates the cables outside of the screen room and cables inside the screen room The board inside the screen room should be placed one meter away from the wall of the screen room where the outside cable is connected Add all the losses from the cables and attenuator s and subtract it from the power level of the packets being transmitted This resulting number is the power level of the received packets Adjust the attenuator while receiving packets on the board inside the screen room and record the percentage of packets received at various attenuation levels This gives you the PER Figure 5 13 Typical TX Output Power dBm per TX_PWR CW Settings YDD 3 3V nam kl j 19 i 25 12 RF6555 ATmega256 Reference Design Application Note Atmel 42262A WIRELESS 04 2014 FCC Compliance Testing 6 This section provides the harmonics performance and FCC pre compliance test results of the RF6555 ATmega256_Referenceboard Second Harmonic Conducted Pout 18dBm Figure 6 1 2b Agilent 17 58 35 Sep 5 2013 EE EE Mkri 4 891050 GHz Ref 35 dBm Atten 5 dB 43 28 dBm Meas Tools Next Peak Next Pk Right Next Pk Left Min Sea
16. nel 19 bandwidth within the band that contains the highest level of desired power The radio frequency power Measure the radio Frequency should be at least 20dB power in the 100kHz below that in the 100kHz i bandwidth outside the bandwidth within the band SKE 2 pone frequency bands in channel 25 that contains the highest level of desired power 6db Bandwidth The minimum 6dB 10 MESSE snd One llebandwidthishould be A 1 4925MHz 21 Conducted on channel 11 least 5S00kHz The minimum 6dB 11 Meas ure Re SO awi houd oe al 1 5825MHz 21 Conducted on channel 19 least 500kKHz The minimum 6dB 12 Mee ee SOE ilabanawidihishould boat 1 5000MHz 21 Conducted Sr Gre 45 least 500kHz Occupied Bandwidth Bandwidth containing 99 of the total integrated power of the transmitted spectrum centered on the assigned channel frequency is measured 13 Channel 11 2 310MHz 21 Conducted 14 Channel 19 2 367MHz 21 Conducted 15 Channel 25 2 370MHz 21 Conducted References 1 ATmega256RFR2 Datasheet http www atmel in Images Atmel 8393 MCU_Wireless AT mega256RFR2 ATmega128RFR2 ATmega64RFR2_Datasheet pdf 2 RF6555 Datasheet http www rfmd com CS Documents RF6555DS pdf 3 RF6575 ATmega128RFA1 reference design hitp www rfmd com atmel zigbeerf aspx 4 Atmel AVR10004 RCB256RF2 Hardware User Manual http www atmel com Images Atmel 42081 RCB256RFR2 Hardware User Manual_ Application Note AVR10004 pdf 5 FCC Code of Federal Register CFR Part 47 Section
17. nt Value Setting Conditions FCC Compliance 1 Measure the Peak Power on Power measured should be 24 74dBm 21 Se channel 11 less than 30dB Measure the Peak Power on Power measured should be 2 channel 19 less than 30dB Siecle Ei 2l Semester Measure the Peak Power on Power measured should be channel 25 less than 30dB 18008 a Seine Mere Peak Power Spectral Density PSD 4 Measure the Peak Power Measure PSD should be 6 64dBm at 21 Ge Spectral Density on channel 11 less than 8dBm 3kHz RBW 5 Measure the Peak Power Measure PSD should be 5 06dBm at 21 Gore Spectral Density on channel 19 less than 8dBm 3kHz RBW 6 Measure the Peak Power Measure PSD should be 4 375dBm at 21 Ge Spectral Density on channel 25 less than 8dBm 3kHz RBW RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 T 16 Table 6 1 FCC Pre compliance Measurements Test Case Expected Result Measurement Conditions Measured Power Value Setting Band Edges Measurement The radio frequency power should be at least 20dB below that in the 100kHz 7 Measure the radio Frequency power in the 100kHz bandwidth outside the ie 40 76dBc 21 Conducted frequency bands in channel 11 2 ndwidth within the band that contains the highest level of desired power 8 Measure the radio Frequency The radio frequency power power in the 100kHz should be at least 20dB bandwidth outside the Se sd 48 67dBc 21 Conducted frequency bands in chan
18. pplications 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
19. rch Span 10 MH pai i 1of2 Center 4 89 GHz Res BW 1 MHz HVBW 3 MHz Sweep ms 401 pts Third Harmonic Conducted Pout 18dBm Figure 6 2 fot Agilent 17 38 13 Sep 5 2013 Bi Th se Mkri 7 336675 GHz Ref 35 dBm Atten 5 dB 47 09 dBm Meas Tools Next Peak dB 11 ts Next Pk Rich Next Pk Left Min Search Span 10 MH pan z 1 of2 Center 7 335 GHz Res BW 1 MHz HVBW 3 MHz Sweep 4 ms 401 pts RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 13 Atmel Figure 6 3 Power Spectral Density at CH11 Pout 18dBm Center 405000000 GHz Span 2 000000 MHz Res BW 3 000 kHz HVBW 10 000 kHz Sweep 148 14 ms Figure 6 4 Power Spectral Density at CH19 Pout 18dBm gen W1 2 44477 GHz 1 50 dBm Ref 30 00 dBm Att 50 dB 445000000 GHz Span 2 000000 MHz W 3 000 kHz HVEN 10 000 kHz Sweep 148 14 ms RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 Figure 6 5 Power Spectral Density at CH25 Pout 18dBm Agen MI 2 47493 GHz 2 17 dBm _Att 50 dB Center 2 475000000 GHz Span 2 000000 MHz Res BW 3 000 kHz VBW 10 000 kHz Sweep 148 14 ms The following table displays the test results of the various tests such as Power Spectral Density Band Edges Measurement and Occupied Bandwidth using the measurements conducted on channels 11 19 and 25 Table 6 1 FCC Pre compliance Measurements Test Case Expected Result Measured Power Measureme
20. rence board connected to Sensor Terminal Board set to search for Peer device Receiver RFMD S aceboar D AMEL X gt e a E ee Bie 2 0 to 3 6VDC Voltage Supply or AA batteries EUT RF6555 ATMega256 Reference board connected to battery terminal set as Peer device Reflector UEC Apply power to transmitter board With terminal emulator window active press any key to search for peer device receiver as shown in Figure 5 8 While the transmitter is searching approximately 12 seconds apply power to receiver board If the receiver is detected the transmitter and receiver displays screens as shown in Figure 5 9 All the required settings can be configured from the transmitter terminal Figure 5 8 Transmitter Node Searching for Peer Node E RF6555ATMEGA256RFR2 TX HyperTerminal File Edit View Call Transfer Help Character received on UART PER Measurement mode ode Press ENTER to Abort Search for Peer Device and to start single node operation m Auto detect 9600 8 N 1 Capture Print echo RF6555 ATmega256 Reference Design Application Note 42262A WIRELESS 04 2014 Figure 5 9 Successful Detection of Peer Node Fo T An a 1 T a o E RFGSSSATMEGA2S6RFR2 TX HyperTerminal am amp z File Edt View Call Transfer Help DF 85 8 amp Character received on UART PER Measurement mode Frames received on air PER Measurement mode Press EN
21. tch for antenna diversity and a 100 ohm Balun for single differential bidirectional TX RX interface all on a single 5mm x 5mm x 0 975mm VQFN 24 Pin package The RF6555 ATmega256_Referenceboard design is a proven range extension for the Atmega256RFR2 with a link budget of 103 5dBm The RF6505 RFFM6201 RF6545 and RF6575 3 also serves as range extensions for the ATmega128RFA1 ATmega256RFR2 1 and AT86RF231 radio transceivers This reference board is pre flashed with the performance test EVK application from MAC 2 8 0 stack software interface to allow performance verification This reference board is available for purchase at RFMD Online Store www rfmd com Contact RFMD Technical Support at smarigrid rfmd com 2 Applications This reference board design can be used for e ZigBee 802 15 4 based systems for Remote Monitoring and Control e Communications Hub for Smart Energy Home Automation e Smart meters for Energy Management 3 Functional Descriptions e Interfacing The RF6555 ATmega256 Referenceboard is equipped with two 50mil 30 pin connectors EXTO 1 that are placed parallel to each other 22mm apart These are for interfacing with the STB e EEPROM An EEPROM is provided on the RF6555 ATmega256 Referenceboard to identify the transceiver and software It stores the production calibration and MAC address information This EEPROM might not be required on the final product after completing the user design e RF Communications The RF6
22. tinue Connected 0 26 22 Auto detect 96008 N 1 NUM Connected 0 25 24 Auto detect 96008 N 1 Transmitter Terminal Receiver Terminal PER Radio to Radio Manual Station set up For an instance of radio to radio conducted PER measurements set the board that transmits packets in its minimum power level This ensures that the EVM is at a low level and to minimize the number of attenuators required Start transmitting packets and use either a power meter or a spectrum analyzer to measure the amplitude of the packets Atmel RF6555 ATmega256 Reference Design Application Note 11 42262A WIRELESS 04 2014 Note The average peak power level of the packets transmitted must be measured This measurement must be considered as a baseline for calculating the attenuation level between the transmit RF6555_ATmega256_Referenceboard and the receive board Using Power Meter e When using a ROHDE amp SCHWARZ NRP power meter the amplitude can be recorded by selecting the T gate Average option in the Mode menu Set the Trigger and increase or decrease the level until the packet amplitude is located Record this value as the baseline measurement e Alternately to record the baseline measurements while using the NRP select the Trace and Statistics option from the Mode menu Select Gates and set both the gates to capture the on burst and record the Average and Peak power levels Perform these steps for each channel that is being measured Using Spectrum A
23. vice Functions gt Connected 0 01 40 Auto detect 96008 N 1 SCRO CAPS Capture Print echo 6 RF6555 ATmega256 Reference Design Application Note Atmel 42262A WIRELESS 04 2014 5 1 Transmission Performance Evaluation Steps for transmission verification test setup 1 From the single node main menu press 1 to enter the Transceiver Configuration menu Figure 5 5 Transceiver Configuration Menu Screen E RF6555ATMEGA2Z25S6RFR2 TX HyperTerminal File Edit View Call Transfer Help Search for Peer Device aborted Starting Performance Test Application in single node operation mode DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE IE DE DE JE DE Software Yersion 4 6 Performance test application ATmega256RFR2 FEM Hain menu 1 Transceiver Configuration 2 Transceiver State Selection 3 Service Functions gt DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE JE DE Search for Peer device initiated Performance test application ATmega 56RFR2 FEM Sub menu 1 1 Transceiver Configuration C Channel 21 Software Yersion 4 6 P Channel page A Receiver Desensitization disabled W Tx power 20 dBm TX PUR x8 Y Antenna diversity enabled Toggle FEM control enabled
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