Atmel AT03911: REB233CBB Module – User Manual
Contents
1. 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 42156A WIRELESS 07 2013 Atmel Atmel logo and combinations thereof Enabling Unlimited Possibilities AVR XMEGA and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries Windows is a registered trademark of Microsoft Corporation in U S and or other countries Other terms and product names may be trademarks of others Disclaimer The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILIT2. PTT 5 57 WART USART sed uniti eis te E e e a e ERR CHEER devia HS ERR d 5 5 9 ID EEPROM 5o er tese eR o pter teris MEE qs n mee ir ee tee itu in 6 6 Mechanical descripligli iuc oecicuor qase ER be Eel poe Er RA PEE E De sdiu oed 7 7 Firmware description m 8 7 1 Range imeas letielil cocum pan cert hen ep eeh cho epae prr pe baee xa Ferr eb R eee icu 8 TAA Power Up the modules eua eo sane hare nn tmt peer repe repehner 8 7 4 2 Run range measurement application seeeeeee 8 7 2 Packet error rate measurement sess 8 7 2 1 Module preparation cuore centena ie ecd taeda eee 8 7 2 2 Driver AS TAM ROU res c ocn aoreet a epe a eben ecd 9 7 2 8 Set up the terminal program on the host PC ssssssssss 9 7 2 4 Power up REB233CBB Modules see 9 7 2 5 Run the packet error rate measurement cceseceeeesseceeeseeeeeeseeees 9 8 Electrical characteristics eessssseeeeseeeeenen 10 8 4 Absolute maximuimratlhgs couronne uite aaa netus 10 8 2 Recommended operating range enirn richer aniani 10 8 3 Current consumption ssssssseseeeeeeeenee nennen nnne nnne nnne nnne 10 86 4 Duty Cycle requirements nitet ertet ree rece ie Di eer eine 11 Appendix A ADDI Iur T snare 12 Appendix B Radio certification 13 Bi United States FGG ioie crt ooien epin iE 13 B2 E tope
3. REB233CBB Modules via the 6 pin ribbon cable so that it fits the notch on the adapter and the colored stripe of the ribbon cable connects to pin 1 of the header USARTDO Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 8 42156A WIRELESS 07 2013 7 2 2 Driver installation Download the USB adapter drivers from http www dresden elektronik de shop prod152 html language en Downloads tab and extract the archive to a folder of your selection If the New Hardware Found wizard prompts for drivers ignore Windows update search No not this time In the next dialog select Install from a list or a specific location and point at the extraction directory Confirm installation ignore warnings that the driver is not digitally signed or did not pass the Windows driver certification If no wizard pops up install drivers manually via the device manager Note The driver installation needs to be performed twice 7 2 3 Set up the terminal program on the host PC A terminal program running on the host PC is used to control the application running on the REB233CBB Modules Set up the terminal program as follows COM PORT Select COM port assigned during USB adapter driver installation BAUD RATE 9600 PARITY None DATA BITS 8 STOP BITS 1 FLOW CONTROL Off 7 2 4 Power up REB233CBB Modules Apply power to both optional one modules by switching on the power switch The modules run a power on ch
4. control of the module Additional microcontroller MCU GPIOs like USART UART and JTAG are available to control the module with a host PC Figure 5 1 REB233CBB Module block diagram ANT1 Battery AT86RF233 ATxmega256A3 Radio PCB Microcontroller PCB User Interface The two REB233CBB Module components the Radio PCB equipped with two swivel antennas and Microcontroller PCB are shown in detail in Figure 5 2 Here the REB233CBB Module is dismounted for better explanation of all important hardware features Figure 5 2 REB233 Module features dismounted view for better description Radio PCB Microcontroller PCB Power switch Mounting header Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 4 42156A WIRELESS 07 2013 5 2 Radio PCB The Radio PCB carries the radio transceiver AT86RF233 3 The radio transceiver is a high performance RF CMOS 2 4GHz radio transceiver targeted for IEEE802 15 4 ZigBee RFACE 6LoWPAN and ISM applications The identification EEPROM carries Radio PCB information used by the Microcontroller PCB 5 3 Antennas The antennas intended for the REB233CBB Module see A 3 and 2 are to be connected to the SMA connectors on the Radio PCB A proper antenna orientation can enhance the radio link budget Especially an orthogonal orientation between the two antennas see Figure 6 1 decreases the probability of RF signal extinction 5 4 Microcontroller PCB The Mic
5. 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 Approved antenna The device has been tested and approved for use with the antenna type listed below The device may be integrated with other custom design antennas which OEM installer must authorize with respective regulatory agencies The used antenna is to be connected to the Radio PCB via an SMA connection Table 8 5 Approved antenna Manufacturer Description Model Frequency Connector TEKFUN Co 4 wave swivel SMA Male M35 S 2400MHz Male SMA antenna Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 14 42156A WIRELESS 07 2013 Appendix C References 1 2 3 4 5 6 7 8 IEEE Std 802 15 4 2011 Wireless Medium Access Control MAC and Physical Layer PHY Specifications for Low Rate Wireless Personal Area Networks LR WPANs M35 S Swivel SMA Male antenna for 2 4GHz Technical specification http www tekfun com tw product php mode show amp cid 28 amp pid 255 TEKFUN CO LTD AT86RF233 Ultra low Power 2 4GHz Transceiver for ZigBee IEEE 802 15 4 GLoWPAN RF4CE SP100 Wireless HART and ISM Applications Datasheet doc no 8351 Atmel Corporation Atmel ATxmega256A3 High perform
6. CU 16MHz int RC 32MHz lae mA transceiver in state TRX_OFF Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 10 42156A WIRELESS 07 2013 Parameter Condition Minimum Typical Maximum Unit 7 8 4 Supply current MCU 16MHz int RC 32MHz 2S mA transceiver in state RX ON MCU 16MHz int RC 32MHz transceiver in state BUSY TX 7 8 5 Supply current Note 1 Measurement results with diode D1 removed 8 4 Duty cycle requirements Table 8 4 TX operating condition No Parameter Condition Minimum Typical Maximum Unit 100ms 744 TX Duty Cycle OQPSK d 31 p Aue IEEE802 15 4 channel 26 Note 1 To ensure FCC compliant operation in IEEE802 51 4 channel 26 the TX duty cycle has to be equal or below the specified maximum value under normal and extreme conditions The duty cycle for other channels is not restricted For further details refer to VNR E33SD X5B 00 FCC test report Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 11 42156A WIRELESS 07 2013 Appendix A Abbreviations AD Antenna diversity CRC Cyclic redundancy check ETSI European Telecommunications Standards Institute FCC Federal Communications Commission ISM Industrial scientific and medical frequency band MAC Medium access control MCU Microcontroller PER Packet error rate R amp TTE Radio and Telecommunications Terminal Equipment Directive of t
7. ETSl etie me Erreur ep iei ene E 14 BS Approved antentia i ere terr prp eorr etn RC REC R RS EC a dpt axe ips 14 Appendix C Emicat indians 15 Appendix D Revision FISIONY icio rrr ER eai 16 Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 2 42156A WIRELESS 07 2013 4 1 4 2 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 REB233CBB Module is a compact solution providing wireless connectivity between IEEE 802 15 4 ZigBee compliant devices The module is compliant to EU and US regulatory requirements The REB233CBB Module is an ideal platform to e Become familiar with a ready to use radio product by Atmel e No configuration required for out of box experience e Evaluate the outstanding REB233CBB Module performance such as e Excellent receiver sensitivity achieved at ultra low current consumption e Performance improvements and robustness by operating antenna diversity e Testthe REB233CBB Module hardware support of the IEEE 802 15 4 standard 1 Assembly instructions Delivery state The REB233CBB Module is delivered in dismounted state Figure 4 1 shows the Microcontroller PCB with batter
8. I Atmel APPLICATION NOTE Atmel AT03911 REB233CBB Module User Manual Atmel MCU Wireless Features e REB233CBB Module targeted for IEEE 802 15 4 ZigBee ZigBee RF4CE 6LoWPAN and ISM applications e Industry leading 101dB link budget e Ulta low current consumption e Ultra low supply voltage 1 8V to 3 6V e Hardware supported antenna diversity e Board information EEPROM e MAC address e Board identification features and serial number e Powered by two AAA batteries for stand alone operation Introduction This manual introduces the Atmel REB233CBB Module a module consisting of an Atmel AT86RF233 radio transceiver and Atmel ATxmega256A3 microcontroller forming a fully functional wireless node Detailed information is given in the individual sections about the REB233CBB Module assembly functionality interfaces and usage Figure 1 1 REB233CBB Module 42156A WIRELESS 07 2013 Table of Contents MEC a 3 CNEG C A 3 4 Assembly instructions uses erre Rer ste rue er ende Ex EUR Up SE KY 3 4 1 BI cA 3 4 2 Preparing the REB233CBB Module essen 3 5 F n etional OS oer Rc 4 5 2 Radio PCBs erede d e e deve des aoe 5 S MEE CILtfre re 5 5 4 Microcontroller P OB uocare rti ieee cane e ip ieu urit niat EEE 5 5i Power SUDDIy u eir inen ur eae Re cue ur EL REL e Re dE SERES x Te cpu a ER RR Segue ce REN RR RRE 5 56 SLEDS amd OUTMONMS
9. Y 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
10. ance Low power 8 16 bit AVR XMEGA Microcontroller datasheet rev 8068P 02 10 Atmel Corporation 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 Atmel AVR2025 IEEE 802 15 4 MAC Software Package User Guide Application Note doc no 8412 Atmel Corporation USB Level Shifter Stick Basic datasheet 03 12 Dresden Elektronik Ingenieurtechnik GmbH Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 15 42156A WIRELESS 07 2013 Appendix D Revision History Version Description 42156A Initial revision Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 16 42156A WIRELESS 07 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 Millennium 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
11. ber little endian byte order 0x10 Board family uint8 _ Internal board family identifier 0x11 Revision uint8 3 Board revision number Board features coded into seven bits 7 Reserved 6 Reserved 5 External LNA 0x14 Feature uint8 4 External PA 3 Reserved 2 Diversity 1 Antenna 9 SMA connector 0x15 Cal OSC 16MHz uint8 RF233 XTAL calibration value register XTAL_TRIM 0x16 Cal RC 3 6V uint8 Atmel ATxmega256A3 internal RC oscillator calibration value 3 6V 0x17 Cal RC 2 0V ulnt8 Atmel ATxmega256A3 internal RC oscillator calibration value 2 0V Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 6 42156A WIRELESS 07 2013 Address Name Description Antenna gain resolution 1 10dBi For example 15 will indicate a gain of 0x18 Antenna gain Int8 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 name Char 30 Textual board description 16 bit CRC checksum standard ITU T generator polynomial G16 x x Ox3E CRC Uint16 UNUS Note MAC addresses used for this product are Atmel property The use of these MAC addresses for development purposes is permitted 6 Mechanical description The mechanical dimensions of the REB233CBB Module are decribed in Figure 6 1 and Table 6 1 Figure 6 1 REB233CBB Module with vertical 1 and horizontal 2 antenna position Ta
12. ble 6 1 REB233CBB Module mechanical dimensions Dimension Length L Width W 60mm Height with vertical antenna position 1 110mm Height with horizontal antenna position 2 70mm Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 7 42156A WIRELESS 07 2013 7 1 Note 7 2 7 2 1 Firmware description Range measurement The REB233CBB Module is pre flashed with the RF performance test suite featuring a range measurement application Each module operates in a standalone manner and is able to transmit or receive data frames A successful transmit or receive operation is indicated by a blinking LED Power up the modules Apply power to both modules by switching on the power switch In consequence of a module runs a power on check and indicates the successful completion by switching on the second of the three LEDs Run range measurement application Select one of the REB233CBB Module and press pushbutton T1 to start the range measurement application First the module initiates a connection and configuration procedure by sending broadcast frames and waiting for a response from the second module After successful configuration the module turns on LED D1 indicating this status The initiator starts transmitting data frames Each data frame transmission is indicated by blinking the TX status LED D2 A successful data frame reception on the second node is indicated by blinking t
13. eck and indicate the successful completion by switching on LED D2 7 2 5 Run the packet error rate measurement Type any character in the terminal window Figure 7 1 to initiate the configuration procedure for a REB233CBB Module Optionally if no peer node is active the search for a peer device can be aborted by pressing ENTER to configure the module stand alone operation The packet error rate measurement can be operated through the menu options displayed on the UART terminal program Figure 7 1 Terminal window Character received PER Measurement mode Prass ENTER to Abort Search for Peer Device and to start single node operation node Search for Peer Device Initiated Search for peer device aborted Storting Performance Test Application in single node operation node Sof tuere Version 3 1 Performance test Sr ication RT86RF233 ATxmega256R3 Main menu 1 Transceiver Configuration 2 Transceiver State Selection 3 Service Functions gt Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 9 42156A WIRELESS 07 2013 8 Electrical characteristics 8 1 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
14. for extended periods may affect device reliability For more details about these parameters refer to individual datasheets of the components used Table 8 1 Absolute maximum ratings Um Teme 0 emdhs ain ated Lm m pn Storage temperature range 40 485 7 1 2 Humidity Non condensing 90 96 r H 7 4 3 Supply voltage ee d 486 V 7 4 4 EXT I O pin voltage ES Vec 0 3 V 7 1 5 Supply current from batteries Sum over all power pins 70 A 7 1 6 Battery Charge current 0 mA Note 1 Keep power switch off or remove battery from REB233CBB Module when external power is supplied 8 2 Recommended operating range Table 8 2 Recommended operating range No Parameter Condition Minimum Typical Maximum Unit Ee 7 2 1 Operating temperature range Crystal within 40ppm 10 60 7 2 2 Supply voltage Vcc Default 1 8 980 3 6 V 7 2 2 Serial flashaccess in usage 2 3 30 3 6 V 8 3 Current consumption Test conditions unless otherwise stated Vop 3 0V Top 25 C Table 8 3 lists current consumption values for typical scenarios of the REB233CBB Module Table 8 3 Current consumption of REB233CBB Module a an Typical aaa ae 7 8 1 Supply current MCU 9 power down transceiver in state SLEEP 17 serial flash in Deep Sleep 7 3 2 Supply current MCU 2MHz mA transceiver in state TRX_OFF 7 8 8 Supply current M
15. he European Union RF A Radio frequency RX Receiver SMA Sub miniature A connection SPI Serial peripheral interface TX Transmitter Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 12 42156A WIRELESS 07 2013 Appendix B Radio certification The device REB233CBB Module consisting of 1 Radio PCB REB233SMAD v8 1 0 assembled with 2 Two 2 4GHz Omni Rubber Antennas M35 S 2 mounted on a 3 Microcontroller PCB Controller Base Board CBB which hosts an application firmware available with 4 Atmel AVR2025 IEEE 802 15 4 MAC Software Package 7 Only this combination of components and assembled as described in Section 4 has received regulatory approvals for modular devices in the United States and European countries The REB233CBB Module is shown in Figure 1 1 B 1 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 Conta
16. he RX status LED D3 The frame transmit repetition rate is fixed to ensure FCC compliance the repetition rate cannot be changed The RX status LED stops blinking if no data frames are received such as when for example the node has left the communication range Data frame transmission can be stopped by pressing T1 once more on the node transmitting frames The REB233CBB Modules are able to transmit and receive simultaneously Pressing pushbutton T1 on both nodes initiates each node to transmit frames Operating modes are indicated as LED D1 a successful start up LED D2 in transmit and LED D3 in receive mode The node configuration gets lost when resetting or switching off the radio modules power supply to restart a reset or power cycle is required for both REB233CBB Modules before pressing T1 on one or both REB233CBB Module s Packet error rate measurement The RF performance test suite features a packet error rate measurement as defined by IEEE802 15 4 and allows to explore various radio transceiver features radio transceiver registers and performance by tuning with customized configurations For this application at least one REB233CBB Module needs to be connected to a PC Module preparation 1 Prepare REB233CBB Modules as described in Chapter 4 2 2 Make sure that the power switch on both modules is in the off position 3 Plug an USB level shifter into a free USB port on your host PC Interconnect this adapter and one of the
17. ies inserted the Radio PCB and two swivel antennas Figure 4 1 REB233CBB Module delivery state Preparing the REB233CBB Module Follow these steps to setup the REB233CBB Module for correct operation 1 Check or set the power switch off at the Microcontroller PCB 2 Insert the two delivered batteries and check for correct polarization 3 The RF Shielding of the Radio PCB must be faced to the battery holder of the Microcontroller PCB Plug in the Radio PCB header XT into the Microcontroller PCB socket Expand T 4 The swivel antennas provided with the REB233CBB Module are tested and approved see A 3 One antenna must be mounted on each SMA coaxial connector X2 and X3 port of the Radio PCB Note to ensure compliance the use of any other antenna type is not permitted see A 3 Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 3 42156A WIRELESS 07 2013 5 Functional description The block diagram of the REB233CBB Module is shown in Figure 5 1 The Radio PCB and Microcontroller PCB are connected via a mounting header The Radio PCB is not functional without connecting it correctly to the Microcontroller PCB The Radio PCB is equipped with two approved antennas see A 3 and 2 to enable antenna diversity AD operation The Microcontroller PCB controls the Radio PCB provides the power supply as well as the user interface The user interface consists of three LEDs and two pushbuttons for manual user
18. ins FCC ID VNR E33SD X5B 00 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 These 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 equ
19. ipment 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 Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 13 42156A WIRELESS 07 2013 Warning IMPORTANT FCC NOTICE to USERS B 2 B 3 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 II of the R amp TTE Directive The manufacturer must maintain a copy of the device documentation 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 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 e fthe CE marking is reduced or enlarged the proportions given in the above graduated drawing must be respected e The CE marking must have a height of at least 5mm except where this is not
20. rocontroller PCB carries the ATxmega256A3 MCU 4 The MCU is a high performance low power 8 16 bit Atmel AVR XMEGA MCU with 256KB in system self programmable flash 8KB boot code section with independent lock bits 16KB internal SRAM and 4KB EEPROM 5 5 Power Supply The REB233CBB Module is powered by two AAA batteries The power switch disconnects batteries from the entire board External power is not routed through the power switch Note There is no protection against over voltage 5 6 LEDs and buttons For simple applications and to provide status information a user interface is provided on board consisting of three LEDs and two pushbuttons The LEDs D1 D3 are connected to PBO 2 for active high operation whereas the pushbutton T1 pulls PB3 to GND The second pushbutton RESET is connected to the MCUs reset pin Table 5 4 LED Button connection ATxmega256A3 ATkmega256A3 PBO 6 D1 PB3 9 T PB1 7 D2 RESET T2 PB2 8 D3 5 7 UART USART The signal lines for asynchronous serial operation of the Atmel ATxmega256A3 USARTDO are connected to header USARTDO In addition the MCU reset line is connected to pin 5 of this header This can be used to work with a serial boot loader No level conversion is done therefore an external RS232 TTL conversion circuit is required The header pin out mates with the available RS232 TTL converter in Figure 5 3 Table 5 2 Connection of USARTDO ATxmega256A3 Header USARTDO PD2 28 R
21. xD 4 Asynchronous serial in PD3 29 TxD 1 Asynchronous serial out Atmel Atmel AT03911 REB233CBB Module User Manual APPLICATION NOTE 5 42156A WIRELESS 07 2013 ATxmega256A3 Header USARTDO Description RESET 57 RESET 5 MCU reset VTG 2 Operating voltage GND 6 Ground Synchronous operation is not supported PC connectivity can be easily achieved by using a serial to USB level shifter stick 8 as shown in Figure 5 3 Figure 5 3 USB level shifter stick 5 8 ID EEPROM The REB233CBB Module identifies the Radio PCB by checking the correct content of the Radio PCB identification ID EEPROM which handles information about the Radio PCB the node MAC address and production calibration values This ensures no other Radio PCB type can be used in conjunction with the delivered Microcontroller PCB and firmware The firmware running on the Microcontroller PCB checks the correct content of the Radio PCB ID EEPROM before continuing with any radio operation In case of wrong or unexpected content of the Radio PCB ID EEPROM the operation is stopped which is indicated by LEDs D1 D2 blinking Table 5 3 shows a detailed description of the Radio PCB ID EEPROM data structure Table 5 3 ID EEPROM mapping Address Name Type Description 0x00 MAC address uint64 MAC address for the 802 15 4 node little endian byte order 0x08 Serial number uint64 _ Board serial num
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