AT02876: Atmel REB212BSMA Hardware User Manual
Contents
1. 8 4 5 RF section 9 5 layout description erret 9 54 Balanced RE pinifam iolt eec its rnt enr cer nce e iria d et e 10 52 s Orystal eicere RR ORT ire a Fui ae rr idee 10 5 3 Transceiver analog GND nennen 11 5 4 Digital GND routing and 12 6 Mechanical description con dn PARU ESSE DUREE 13 7 Electrical characteristics cm 14 7 1 Absolute maximum 14 7 2 Recommended operating rarige ia coiere tirer 14 7 9 Guirtent consumplilis RAE Rae CHEER E REIR UNES 14 8 15 9 ABDIOVIallOflS ise n p ARD 15 Appendix A PCB design data 16 1 Schematic 16 A2 Assembly oec de 17 Billof matetialS uideret ree ott ie rie HER Rt EF Re S 17 Appendix B Radio certification 19 Bat United States FOC dee ttn ERE RARE RUE 19 B 1 1 Compliance Statement Part 15 19 19 B 1 2 Compliance Statement Part 15 105 0 19 B9 Warning Part 15 2 eorr ter2. E P 0000100 657 QI 294 T 91195 uuoysiaaaysoquinu yonporg sevi ZHS LHS ano 3dzz oro T aus OL aq s pped ou 3904 pue doy uo euejd s or sud amoy quo quo 99 gt aldis zoid 9 2 92124 981 11 NISH ped Hid Ld ped 91 0010VS18 19680 ig ano ang 128 1120 7 Sununojy peog advo adco zx 2 50 IOANON dV2 390 25 e IN X9dPOAMLON gon gt d TIN Sin 7 IN X9dPOAMLON von T s NISH TIN XSNZEdMLON 1 1 9010821 ven sn aNd i 30001 20001 6AEDSODZ9 2 EED 5926 2
3. lt _ Atmel APPLICATION NOTE AT02876 Atmel REB212BSMA Hardware User Manual Atmel MCU Wireless This manual describes the REB212BSMA radio extender board demonstrating the high performance at ultra low power consumption of the Atmel AT86RF212B radio transceiver Features e High performance 700 800 900MHz RF CMOS AT86RF212B radio transceiver targeted for ZigBee IEEE 802 15 4 6LoWPAN and ISM Applications e 121dB link budget e Ultra low current consumption e Ultra low supply voltage 1 8V 3 6V e RF reference design and high performance evaluation platform e Interfaces to several of the Atmel microcontroller development platforms e Board information EEPROM e MAC address e Board identification features and serial number e Crystal calibration values 42097A WIRELESS 04 2013 Table of contents 1 Introduction M 3 ssp MER ss 3 Ou JOVBFVIBU 3 4 Functional description co One ut ciis e bb bu oov as 4 4 1 CONNEC m 5 4 1 1 Atmel ATmega1281 configuration 5 4 1 2 Atmel ATmega644 6 225 EET 6 43 Supply 8 44
4. 13 nc 14 nc 15 mde 16 nc 17 optionally XT1 MCLK 18 19 20 21 GND 22 GND 23 PB7 open 24 PB6 open 25 PB5 RSTN 126 PB4 SLPTR 27 PB3 MISO 28 PB2 MOSI 29 PB1 SCLK 30 PBO SEL PD7 TP1 32 PD6 MCLK 33 PD5 TP2 34 PD4 DIG2 35 36 PD2 open 37 PD1 38 PDO 39 GND 40 EE WP write protect EEPROM Note 1 Possible by retrofitting a OR assembly Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 5 42097A WIRELESS 04 2013 4 1 2 Atmel 44 configuration The following table lists the pin assignment of the ATmega644 configuration It is enabled by re assembling R10 through R23 to their alternate locations Table 4 2 Expansion connector mapping when assembled for ATmega644 Ping Function Pin Function 1 GND 2 GND 3 4 5 6 7 8 9 10 12 _13 TA 15 16 17 n c optionally XT1 MCLK 18 19 Veo 20 21 GND 22 GND 23 24 6 MISO 25 PBS MOSI 26 PB4 SEL 27 PBS open 28 2 RSTN 29 1 30 PBO open 31 PD7 SLPTR 32 PD6 DIG2 33 PDS TP2 84 4 open 35 36 PD2 IRQ 37 PD1 4
5. 38 open 39 GND 40 EE WP write protect EEPROM Note 1 Possible by retrofitting OR assembly 42 ID EEPROM To identify the board type by software an identification ID EEPROM U5 is populated Information about the board the node MAC address and production calibration values are stored here A serial EEPROM AT25010B 3 with 128 x 8 bit organization and SPI bus is used because of its small package and low voltage and low power operation The SPI bus is shared between the EEPROM and the transceiver The select signal for each SPI slave radio transceiver is decoded with the reset line of the transceiver RSTN Therefore the EEPROM is addressed when the radio transceiver is held in reset RSTN 0 see Figure 5 2 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 6 42097A WIRELESS 04 2013 Figure 4 2 EEPROM access decoding logic Atmel 1281 configuration PB5 RSTN RSTN Transceiver d AT86RF212B PBO SEL SELN PB1 3 SPI ID EEPROM CS The EEPROM data is written during board production testing A unique serial number the MAC address and calibration values are stored These can be used to optimize system performance Table 5 3 shows a detailed description of the EEPROM data structure Table 4 3 ID EEPROM mapping Address Name Type Description 0x00 MAC uint64 MAC address for the 802 15 4 node little endian byte order addr
6. transceiver GND routing Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 11 42097A WIRELESS 04 2013 The soldering technology used allows the placement of small vias 0 15mm drill within the ground paddle underneath the chip During reflow soldering the vias get filled with solder having a positive effect on the connection cross section The small drill size keeps solder losses within an acceptable limit During the soldering process vias should be open on the bottom side to allow enclosed air to expand 5 4 Digital GND routing and shielding With the AtmelAT86RF212B consider pins 12 16 18 and 21 as digital ground pins Digital ground pins are not directly connected to the center paddle They may carry digital noise from I O pad cells or other digital processing units within the chip In case of a direct paddle connection impedances of the paddle ground vias could cause a small voltage drop for this noise and may result in an increased noise level transferred to the analog domain There is a number of pro s and con s when it comes to the shielding topic The major con s are e Cost of the shield e Manufacturing effort e naccessibility for test and repair The number of pro s might be longer but the cost argument is often very strong However the reasons to add the shield for this reference design are e Shield is required for a certification in Japan e Shield is recommended for FCC certification in North
7. LR WPANs FCC Code of Federal Register CFR Part 47 Section 15 35 Section 15 205 Section 15 209 Section 15 232 Section 15 247 and Section 15 249 United States ETSI EN 300 328 Electromagnetic Compatibility and Radio Spectrum Matters ERM Wideband Transmission Systems Data transmission equipment operating in the 2 4GHz ISM band and using spread spectrum modulation techniques Part 1 3 ARIB STD T66 Second Generation Low Power Data Communication System Wireless LAN System 1999 12 14 H11 12 14 Version 1 0 9 Abbreviations Atmel Advanced Encryption Standard Controller Base Board ER Median Access Control Printed Circuit Board EE Radio Extender Board dc Radio frequency T Hn Sub miniature A coaxial RF connector ewe Serial Peripheral Interface AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 15 42097A WIRELESS 04 2013 PCB design data Appendix A Schematic A 1 god vwsazizaay MUS GILIL 6191 60v queunsog Wd 15 56 7 zl0z s L 3 ea RMON uus t 9606
8. 1 5 2 Balanced RF pin fan out Figure 5 1 Board layout RF pin fan out Y short GND connect The Atmel AT86RF212B antenna port should be connected to a 1000 load with a small series inductance of app 3nH This is achieved with the connection fan out in between the IC pins and the filter balun combination B1 The trace width is kept small at 0 15 mm for a length of approximately 2 5 mm The REB212BSMA is a two layer FR4 board with a thickness of 1 5 mm Therefore the distributed capacitance between top and bottom is low and transmission lines are rather inductive The distance between balun and transceiver also allows GND vias for pin 3 and pin 6 of the AT86RF212B The GND connection in a low distance has a small parasitic inductance and is therefore desirable for the RF port Crystal routing The reference crystal PCB area requires optimization to minimize external interference and to keep any radiation of 16 MHz harmonics low Since the board design incorporates a shield the crystal housing has been tied hard to ground This method will minimize the influence of external impairments such as burst and surge To prevent crosstalk the crystal is encircled by a ring of ground traces and vias Special care has to be taken in the area between the IRQ line and the crystal Depending on the configuration the interrupt may be activated during a frame receive Crosstalk into the crystal lines would increase the phase noise and th
9. America e Increased performance Besides the function to provide supply ground to the individual parts the ground plane has to be considered as a counterpart for the antenna Such an antenna base plate is required to achieve full antenna performance It has to be a continuous sustained metal plate for that purpose The shield covering the electronic section will help to form this antenna base plate For that reason any unused surface should be filled with a copper plane and connected to the other ground side using sufficient through hole contacts Larger copper areas should also be connected to the other side layer with a grid of vias This will form kind of a RF sealing for the PCB material Any wave propagation in between the copper layers across the PCB will become impossible This way for an external electromagnetic field the board will behave like a coherent piece of metal When a trace is cutting the plane on one side the design should contain vias along this trace to bridge the interrupted ground on the other side Place vias especially close to corners and necks to connect lose polygon ends The pads where the shield is mounted also need some attention The shield has to be integrated in the ground planes Vias in a short distance to the pads will ensure a low impedance connection and also close the FR4 substrate as mentioned above Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 12 42097A WIRELESS 04 2013 6 M
10. Amg PCBA LABEL 212 01 5 1 R800 AQ8 144072 x 1 1 B Fl Di y EH 25822 95 FARE cas NUN H lt Rtmega 44 route ER SCOP BOBO OO OOF ACER lt Atmegal281 route Xi 0 30 0 0000000000000000000g Bill of materials yn tent cron 868 900MHz FilterBalun SMD 0896FB15A0100 Johanson 0896FB15A0100 1 25x2 0mm Technology C31 C32 Ceramic capacitor SMD 0402 C0402C105K9PAC Kemet C35 C36 X5R 6 3V 10 C33 C34 Ceramic capacitor SMD 0402 GRM155R71C104KA88D Murata 100nF C39 X7R 16V 10 C37 C38 Ceramic capacitor SMD 0402 ECJOEC1H100D Panasonic 10pF NPO 50V 5 C40 Ceramic capacitor SMD 0402 GRM1555C1H2R2CZ01D Murata 2 2pF NPO 50V 0 25pF C6 Ceramic capacitor SMD 0402 GRM1555C1H101JZ01D Murata 100p NPO 50V 10 deCeramic capacitor SMD 0402 COG 16V 5 D1 3V9 3W SMD zener SMA BZG05C3V9 Vishay BZG05C3V9 1 PolySwitch Resettable fuse 20 Raychem miniSMDCO20F 0 2A 30V J3 Jumper cap for 2 54mm 3300096 CAB Jumper pinheader JP1 Pin Header 1x2 2 54mm THM 1001 121 002 CAB 1001 121 002 L1 SMD Ferrite 2200hm 100MHz 74279263 W rth Elektronik 74279263 0603 size Q1 16MHz SX 4025 4 x 2 5 mm XTL551150NLE 16 0MHz SIWARD 16MHz SMD 10ppm 9 0R R10 R12 Thick film resistor SMD 0603 RC1608J000CS Samsung 0800 R14 R17 1 10W 1 R19 R21 R23 R5
11. ID EEPROM The SPI bus of the EEPROM is shared with the radio transceiver interface Figure 4 1 REB212BSMA block diagram Protectio AT86RF212B EEPROM EXPANDI oor e REB212BSMA Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 4 42097A WIRELESS 04 2013 4 1 Interface connector The REB212BSMA is equipped with 2 x 20 pin 100mil expansion connector X1 The pin assignment enables a direct interface to the REB CBB 2 Further the interface connects to the Atmel STK500 501 microcontroller development platform to enable support for various Atmel 8 bit AVR microcontrollers The REB212BSMA is preconfigured to interface to an STK501 with an Atmel ATmega1281 or a REB CBB with an Atmel ATxmega 256 respectively To operate the REB212BSMA with an Atmel ATmega644 on STK500 the 00 resistors R10 through R18 must be removed and re installed on the board manually as resistors R20 through R28 see Appendix A Other microcontroller development platforms need to be interfaced using a special adapter board 4 1 1 Atmel ATmega1281 configuration The following table lists the pin assignment of the ATmega1281 configuration shipping default Table 4 1 Default expansion connector mapping ATmega1281 configuration Pin Function Ping Function 1 GND 2 GND 3 14 n c 5 6 n C 7 n c 8 9 10 11 12
12. and ensure the final product does not exceed the specified power ratings 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 The marking must be affixed to a visible location on the product The CE mark shall consist of the initials CE taking the following form e If the CE marking is reduced or enlarged the proportions given in the above graduated drawing must be respected Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 19 42097A WIRELESS 04 2013 e The marking must have a height of at least 5mm except where this is not possible on account of the nature of the apparatus e 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 10 Revision History Doc Rev Date Comments 42097A 042013 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 20 42097A WIRELESS 04 2013 Atmel Enabling Unlimited Possibilities Atmel Corporation Atmel Asia Limited Atmel Munich GmbH Atmel Japan G K 1600 Technology Drive Unit 01 5 amp 16 19F Business Campus 16F Shin Osaki Kangyo Bldg San Jose CA 95110 BEA Tower Millenni
13. base board REB CBB has received regulatory approvals for modular devices in the United States and European countries United States FCC Compliance Statement Part 15 19 The device complies with Part 15 of the FCC rules To fulfill FCC Certification requirements an Original Equipment Manufacturer OEM must comply with the following regulations e The modular transmitter must be labeled with its own FCC ID number and if the FCC ID is not visible when the module is installed inside another device the outside of the device into which the module is installed must also display a label referring to the enclosed module e This exterior label can use wording such as the following Any similar wording that expresses the same meaning may be used Contains FCC ID VW4A091619 This device 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 Use in portable exposure conditions FCC 2 1093 requires separate equipment authorization Modifications not expressly approved by this company could void the user s authority to operate this equipment FCC Section 15 21 Compliance Statement Part 15 105 b This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules T
14. the AT86RF212B to the SMA connector X2 To estimate the effective output power for the SMA connector reference plane insertion losses of the balun and the transmission line have to be taken into account Therefore the SMA connector output power can be up to 1 5 dB below the AT86RF212B datasheet value according to specification of the balun Insertion loss data for the individual components can be obtained from associated datasheets Please check the part reference inside the BOM in section A 3 PCB layout description This section describes critical layout details to be carefully considered during a PCB design The PCB design requires taking care of the following topics e Create a solid ground plane as a stable reference for the transceiver the antenna and the transmission lines The PCB has to be considered as a part of the antenna it interacts with the radiated electromagnetic wave e Isolate digital noise from the antenna and the radio transceiver to achieve optimum range and RF performance e Isolate digital noise from the 16 MHz reference crystal to achieve optimum transmitter and receiver performance e Reduce any kind of spurious emissions below the limits set by the individual regulatory organizations The REB212BSMA PCB design further demonstrates a low cost two layer PCB solution without the need of an inner ground plane Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 9 42097A WIRELESS 04 2013 5
15. 69 6F 45 78 74 65 6E 64 65 72 32 31 32 RadioExtender212 0030 42 53 4D 41 00 00 00 00 00 00 00 00 00 00 2B 05 BSMA us 0040 FF FF FF FF FF FF FP FF FF FF FF 9 0050 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 0060 BP l9 xc 0070 FF FF FF FF FF FF FF FF FF FF FF FF FF FF Supply current sensing A jumper JP1 is placed in the supply voltage trace to offer an easy way for current sensing The current consumption of all circuitry connected to the supply domains DEVDD EVDD such as AT86RF212B and AT25010B can be measured by connecting an ampere meter instead of the jumper cap JP1 see Figure 5 3 The power supply pins of the radio transceiver are protected against overvoltage and reverse polarity at the X1 connector pins net CVTG net DGND using a Zener diode D1 and a thermal fuse F1 see Appendix A This is required because the Atmel STK500 will provide 5V as default voltage and the board can also be mounted with reverse polarity Depending on the actual supply voltage the diode D1 can consume several milliamperes This has to be considered when the current consumption of the whole system is measured In such a case D1 should be removed from the board To achieve the best RF performance the analog EVDD and digital DE
16. 9 ZOO LZL LOOL o A ld 1 4 4 aeduiny SIM er 0040 0040 zu 0 0040 0040 138 136 vad 0040 0040 Sla gu 584 0040 0050 OSIN Tre OSIN 98d 0040 0040 155 Ylu 194 AIS 18 00 0 0040 ziu 18d 00H0 0030 1418 tad uidils 10 0040 0030 Ta tad 90 0030 00840 153 Su S d 0 0 1 1 001 un pala 0 d 153 tad S d Old 90d tad zad tad Sad ano juo 99 Jaras 0040 IE 1 E x aa aa soppis jakda lt Jo aso dn aye E 1X LANYdXI 1094138 dog jo asn oL E 16 42097A WIRELESS 04 2013 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 02876 Atmel 2 Assembly drawing
17. C 0x12 is stored in the ID EEPROM see 5 2 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 8 42097A WIRELESS 04 2013 4 5 The reference frequency is also available pin of the radio transceiver and depending on the related register setting it is divided by an internal prescaler The CLKM signal is filtered by a low pass filter to reduce harmonic emissions within the 868 915 MHz ISM band The filter is designed to provide a stable 1 MHz clock signal with correct logic level to a microcontroller pin with sufficiently suppressed harmonics Usage of CLKM frequencies above 1 MHz requires a re design of R25 and C40 In case of RC cut off frequency adjustments depending on the specific load and signal routing conditions one may observe performance degradation within affected IEEE channels Channel 4 912 MHz is affected by the following harmonics 57 x 16 MHz or 114 x 8 MHz By default CLKM is routed to a microcontroller timer input check the individual configuration resistors in the schematic drawing A 1 To connect to the microcontroller main clock input assemble with a 00 resistor RF section The Atmel AT86RF212B radio transceiver incorporates all RF and base band critical components necessary to transmit and receive signals according to IEEE 802 15 4 or proprietary ISM data rates The balun B1 performs the differential to single ended conversion of the RF signal to connect
18. 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 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 21 42097A WIRELESS 04 2013
19. R7 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 17 42097A WIRELESS 04 2013 2 R24 R26 Thick film resistor SMD 0402 RC1005F1005CS Samsung 1M00 1 16W 196 1 R25 Thick film resistor SMD 0402 RC1005F 4700CS Samsung 470R 1 16W 196 1 R32 Thick film resistor SMD 0402 RC100SF22RO0CS Samsung 22R 1 16W 196 1 R8 Thick film resistor SMD 0402 RC1005F1002CS Samsung 10k0 1 16W 1 1 SH1 EMI Shield Frame 25x30x3mm LTO8AD4303F Laird LTO8AD4303F Technologies 1 SH2 EMI Shield Cover LTO8AD4303C Laird LT08AD4303C 25 6x30 6x2mm Technologies 1 U1 Low Power 700 800 900 MHz AT86RF212B ZU ATMEL AT86RF212B ZU Transceiver for IEEE 802 15 4 ZigBee 6LoWPAN and ISM Applications 1 U4 Dual 2 Input OR gate ULP NC7WP32K8X_NL Fairchild NC7WP32K8X_NL NC7WP32K8X US 8 1 U5 1kbit Serial EEPROM AT25010B MAHL T Adesto AT25010B MAHL T AT25010B MAHL T 1 8 5V Technologies Ultra Thin UDFN 8 1 U6 Dual Inverter ULP A NC7WV04P6X_NL Fairchild NC7WV04P6X_NL NC7WV04P6X_NL SC70 6 1 1 2x20 pin header right angle 1007 121 040 1007 121 040 2 54 mm pitch through hole 1 2 End Launch Jack Receptacle 142 0711 821 EMERSON 142 0711 821 Round Contact Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 42097A WIRELESS 04 2013 18 Appendix Radio certification B 1 B 1 1 B 2 The REB212BSMA mounted on a REB controller
20. VDD supply are separated from each other by a CLC PI filter All components connected to nets DEVDD EVDD contribute to the total current consumption While in radio transceiver SLEEP state most of the supply current is drawn by the 1MQ pull up resistor R21 and the EEPROM standby current Figure 4 3 Power supply routing B E EVDD HEADER 2 1001 121 002 CVTG miniSMDC020F D1 BZG05C3V9 100nF GND GND Radio transceiver reference clock The integrated radio transceiver is clocked by a 16 MHz reference crystal Q1 Operating the node according to IEEE 802 15 4 4 the reference frequency must not exceed a deviation of 40 ppm The absolute frequency is determined by the external load capacitance of the crystal which depends on the crystal type and is given in its datasheet The radio transceiver reference crystal Q1 shall be isolated from fast switching digital signals and surrounded by a grounded guard trace to minimize disturbances of the oscillation Detailed layout considerations can be found in Section 6 2 The REB212BSMA uses a Siward SX4025 crystal with two load capacitors of 10 pF each To compensate for fabrication and environment variations the frequency can be further tuned using the radio transceiver register XOSC CTRL 0x12 refer to 1 The REB production test guarantees a tolerance of within 20ppm and 5ppm The correction value to be applied to TRX register XOS
21. an SMA connector for an external whip antenna External antennas can be connected to the SMA ports as well as RF measurement equipment for performance evaluation of the radio transceiver The radio extender board was designed to interface to the Atmel microcontroller development or evaluation platforms for example Atmel STK 500 The microcontroller platform in combination with the REB provides an ideal way to e Evaluate the outstanding radio transceiver performance such as the excellent receiver sensitivity achieved at ultra low current consumption e the radio transceiver s comprehensive hardware support of the IEEE 802 15 4 2011 standard e Test the radio transceiver s enhanced feature set which includes MAC hardware acceleration AES encryption and high data rate modes Figure 4 1 shows a development and evaluation setup using the REB controller base board REB CBB in combination with the REB212BSMA radio extender board via SMA connector which is assembled with quarter wave whip antenna Figure 3 1 The REB212BSMA connected to REB CBB 4 Functional description The block diagram of the REB212BSMA radio extender board is shown in Figure 5 1 The power supply pins and all digital I Os of the radio transceiver are routed to the 2 x 20 pin expansion connector to interface to a power supply and a microcontroller Board specific information such as board identifier MAC address and production calibration values are stored in an
22. echanical description The REB212BSMA is manufactured using a low cost two layer printed circuit board All components and connectors are mounted on the top side of the board The format was defined to fit the EXPAND1 connector on the Atmel AVR STK500 STK501 microcontroller evaluation board The upright position was chosen for best antenna performance Figure 6 1 Mechnical dimensions 5Omm L ra mm mm 55 00mm mium mium mium Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 13 42097A WIRELESS 04 2013 7 Electrical characteristics 7 4 Absolute maximum ratings Stresses beyond the values listed in Table 8 1 may cause permanent damage to the board This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this manual are not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability For more details about these parameters refer to individual datasheets of the components used Table 7 1 Absolute maximum ratings 1 Keep power switch off or remove battery from REB CBB when external power is supplied Storage temperature 40 to 85 C Supply 0 3 to 43 6 V Ext IO pin voltage 0 3 to Vcc 0 3 V Supply curr
23. ent from 0 5A Charge current D M 0A 7 2 Recommended operating range No Parameter Condition Minimum Typical Maxium Units 20 70 EE Operating temperature range Supply voltage Vcc Plain REB CBB 1 6 3 0 3 6 V REB plugged on REB 1 8 3 0 8 6 V CBB Serial flash access in 2 3 3 0 3 6 V usage 7 3 Current consumption e measured at JP1 e Whip antenna mounted to SMA connector Supply current Transceiver SLEEP In pA Supply current Transceiver 05 mA TRX_OFF CLKM switched off CLKM_CTRL 0 Supply current 9 2 Supply current BUSY TX 25 mA Notes 1 Board eeprom standby current 2 Modulation OQPSK 250 Tx output power 10 dBm Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 14 42097A WIRELESS 04 2013 8 References 1 2 3 4 5 6 7 AT86RF212B Low Power 700 800 900 MHz Transceiver for ZigBee IEEE 802 15 4 6LoWPAN and ISM Applications Datasheet Rev 42002A MCU Wireless 04 12 Atmel Corporation AVR2042 REB Controller Base Board Hardware User Guide Application Note Rev 8334A AVR 08 10 Atmel Corporation AT25010B SPI Serial EEPROM Datasheet Rev 8707CJ SEEPR 6 11 Atmel Corporation IEEE Std 802 15 4 2006 Wireless Medium Access Control MAC and Physical Layer PHY Specifications for Low Rate Wireless Personal Area Networks
24. ere 19 B2 Europe ETSI 19 10 Revision History M 20 Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 42097A WIRELESS 04 2013 Introduction This manual describes the REB212BSMA radio extender board demonstrating the high performance at ultra low power consumption of the Atmel AT86RF212B radio transceiver Detailed information is given in the individual sections about the board functionality the board interfaces and the board design The REB212BSMA connects directly to the REB controller base board REB CBB 2 or can be used as an RF interface in combination with one of the Atmel microcontroller development platforms The REB212BSMA together with a microcontroller forms a fully functional wireless node Figure 1 1 REB212BSMA Radio Extender Board Vins ARE renim n E Atmega644 route id Atmegai2e1 route 800 Disclaimer Typical values contained in this application note are based on simulations and testing of individual examples Any information about third party materials or parts was included in this document for convenience The vendor may have changed the information that has been published Check the individual vendor information for the latest changes Overview The radio extender board is assembled with an Atmel AT86RF212B radio transceiver 1 and equipped with
25. erefore reduce the signal to noise ratio Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 10 42097A WIRELESS 04 2013 Figure 5 2 Board layout crystal routing 5 3 The reference crystal and its load capacitors C37 38 form the resonator circuit These capacitors are to be placed close to the crystal The ground connection in between the capacitors should be a solid copper area right underneath the crystal including the housing contacts Transceiver analog GND routing With the Atmel AT86RF212B consider pins 3 6 27 30 31 and 32 as analog ground pins Pin 7 is an exception and can be connected to the central paddle like the other analog ground pins Analog ground pins are to be routed to the paddle underneath the IC The trace width has to be similar to the pad width when connecting the pads and increase if possible in some distance from the pad This measure will decrease the parasitic inductance as far as possible Each ground pin should be connected to the bottom plane with at least one via Move the vias as close to the IC as possible It is always desired to integrate the single pin ground connections into polygon structures after a short distance Top bottom and on multilayer boards the inner ground planes should be tied together with a grid of vias When ground loops are smaller than one tenth of the wavelength it is safe to consider this as a solid piece of metal Figure 5 3 Board layout
26. ess 0 08 Serial uint64 Board serial number little endian byte order number 0x10 Board uint8 Internal board family identifier family 0 11 Revision uint8 3 Board revision number 0x14 Feature uint8 Board features coded into seven bits 7 Reserved 6 Reserved 5 External LNA 4 External PA 3 Reserved 2 Diversity 1 Antenna 0 SMA connector 0x15 Cal OSC uint8 XTAL calibration value register TRIM 16MHz 0x16 Cal RC uint8 Atmel 1281 internal RC oscillator calibration value 3 6V 3 6V register OSCCAL 0x17 Cal RC uint8 Atmel ATmega1281 internal RC oscillator calibration value 20 _ 2 0V register OSCCAL 0x18 Antenna int8 Antenna gain resolution 1 10dBi gain For example 15 will indicate a gain of 1 5dBi The values 00h and FFh are per definition invalid Zero or 0 1dBi has to be indicated as 01h or FEh 0x20 Board char 30 Textual board description name Ox3E CRC uint16 16 bit CRC checksum standard ITU T generator polynomial G16 x x16 x12 5 1 1 Note addresses used for this package are Atmel property The use of these MAC addresses for development purposes is permitted Atmel AT02876 Atmel REB212BSMA Hardware User Manual APPLICATION NOTE 7 42097A WIRELESS 04 2013 4 3 4 4 Example EEPROM dump 0000 DO 63 17 FF FF 25 04 00 DC 25 00 00 4E 00 00 00 c N 0010 00 05 00 03 02 00 86 86 00 FF FF FF FF FF FF FF 0020 52 61 64
27. hese limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Warning Part 15 21 Changes or modifications not expressly approved by this company could void the user s authority to operate the equipment Europe ETSI If the device is incorporated into a product the manufacturer must ensure compliance of the final product to the European harmonized EMC and low voltage safety standards A Declaration of Conformity must be issued for each of these standards and kept on file as described in Annex Il of the R amp TTE Directive The manufacturer must maintain a copy of the device documentation
28. um City 5 Parkring 4 1 6 4 Osaki Shinagawa ku USA 418 Kwun Tong Road D 85748 Garching b Munich Tokyo 141 0032 Tel 1 408 441 0311 Kwun Tong Kowloon GERMANY JAPAN Fax 1 408 487 2600 HONG KONG Tel 49 89 31970 0 Tel 81 3 6417 0300 www atmel com Tel 852 2245 6100 Fax 49 89 3194621 Fax 81 3 6417 0370 Fax 852 2722 1369 2013 Atmel Corporation All rights reserved Rev 42097A WIRELESS 04 2013 Atmel Atmel logo and combinations thereof Enabling Unlimited Possibilities AVR 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 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
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