MRF24WG0MA/MB Data Sheet
Contents
1. TABLE 1 1 Pin Description Pin Symbol Type Description 1 GND P Ground 2 NC NC No connect 3 NC NC No connect 4 NC NC No connect 5 NC NC No connect 6 NC NC No connect 7 RESET I Constant Module Reset input 8 NC NC Do not connect 9 NC NC No connect 10 GND P Ground 11 NC NC Do not connect 12 NC NC Do not connect 13 NC NC Do not connect 14 NC NC Do not connect 15 NC NC Do not connect 16 WP 2 Write protect this pin is used to enable FLASH update 17 VDD P Power 18 GND P Ground 19 GND P Ground 20 HIBERNATE Hibernate mode enable input will disable the module 21 NC NC No connect 22 NC NC Do not connect 23 cs I Constant SPI Chip Select input constant drive or pull up required 24 NC NC Do not connect 25 GND P Ground 26 DEBUGRX Serial debug port input see Section 2 0 Circuit Description 27 DEBUGTX O Serial debug port output see Section 2 0 Circuit Description 28 GND P Ground 29 VDD P Power 30 GND P Ground 31 NC NC Do not connect 32 SDO O SPI data out 33 INT Interrupt output open drain requires a pull up 34 SCK SPI clock input 35 SDI SPI data in 36 GND P Ground Legend Pin type abbreviation P Power Input Input O Output NC Do Not Connect NC No Connect Note 1 Signals of Type I Constant must either be constantly driven by the host or have a pull2. INT GND For further regulatory Certification Utility and documentation contact your local Microchip salesperson 35 Wi Fi Alliance Wi Fi Alliance Certification focuses on interoperability testing of devices based on 802 11 standards Historically when the certification process and programs were developed by Wi Fi Alliance members the vast majority of the 802 11 clients were PC centric and certification testing adequately addressed those types of devices In subsequent years the number of Wi Fi devices that are not PC centric has grown significantly These non standard devices as a class of products have been dubbed Application Specific Devices ASDs by the Wi Fi Alliance ASDs are 802 11 devices for example clients or access points APs which cannot be tested under a standard Alliance test plan because they do not comply with the standard test configuration and or because they are designed to perform a specific application Examples include but are not limited to bar code scanners pagers recording devices monitoring equipment and cable modems The APs or clients that are used to validate ASD compliance from the standard test bed will meet all of the requirements specified in the applicable System Interoperability Test Plans referred to as the standard test plan unless specifically exempted The MRF24WGOMA MB modules are in the ASD category The modules are certified under Wi Fi 802 11 with
3. Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help 2012 Microchip Technology Inc Advance Information DS70686A page 21 MRF24WGOMA MB 3 1 1 RF EXPOSURE All transmitters regulated by FCC must comply with RF exposure requirements OET Bulletin 65 Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic Fields provides assistance in determining whether proposed or existing transmitting facilities operations or devices comply with limits for human exposure to Radio Frequency RF fields adopted by the Federal Communications Commission FCC The bulletin offers guidelines and suggestions for evaluating compliance If appropriate compliance with exposure guidelines for mobile and unlicensed devices can be accomplished by the use of warning labels and by providing users with information concerning minimum separation distances from transmitting structures and proper installation of antennas The following statement must be included as a CAUTION statement in manuals and OEM products to alert users of FCC RF exposure compliance To satisfy FCC RF Exposure requirements for mobile and base station transmission devices a separation dist
4. The host device shall be properly labeled to identify the module within the host device The Industry Canada certification label of a module shall be clearly visible at all times when installed in the host device otherwise the host device must be labeled to display the Industry Canada certification number of the module preceded by the words Contains transmitter module or the word Contains or similar wording expressing the same meaning as follows Contains transmitter module IC 7693A 24WGOMAMB User Manual Notice for License Exempt Radio Apparatus from Section 7 1 3 RSS Gen Issue 3 December 2010 User manuals for license exempt radio apparatus shall contain the following or equivalent notice in a conspicuous location in the user manual alternatively on the device or both This device complies with Industry Canada license exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of the device Le pr sent appareil est conforme aux CNR d Industrie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radio lectrique subi m me si le brouillag
5. WPA2 WPA and WEP System Interoperability ASD Model Test Plan with Test Engine For IEEE 802 11a b and g Devices Version 1 0 2012 Microchip Technology Inc Advance Information DS70686A page 25 MRF24WGOMA MB NOTES DS70686A page 26 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 4 0 ELECTRICAL CHARACTERISTICS TABLE 4 1 DIGITAL ELECTRICAL CHARACTERISTICS NOMINAL CONDITIONS 25 3 3V Parameters Min Typ Max Units ViL Input low voltage 0 3 0 8 V VIH Input high voltage 2 5 5 V VoL Output low voltage 0 4 V Output high voltage 2 4 V loL Output low level current at VOL Max 8 5 mA Output high level current at Min 15 4 mA TABLE 4 2 ABSOLUTE MAXIMUM RATINGS Parameters Min Max Notes Storage Temperature 40 C 125 C OV 3 60V VIN on SDI CS SCK 0 3V 3 60V Note 1 The listed Absolute Maximum Ratings are not meant for functional operation Operation exceeding these levels is not guaranteed and may reduce the operating life of the component TABLE 4 3 RECOMMENDED OPERATING CONDITIONS Parameters Min Typ Max Units Ambient Temperature 40 485 Degrees Celsius for and IC 2 80 3 3 3 60 Volts for ETSI 3 0 3 3 3 60 Volts TABLE 4 4 CURRENT
6. CONSUMPTION NOMINAL CONDITIONS 25 C 3 3V Parameters Min Typ Max Units Conditions IDD Hibernate 3 3V 0 1 mA a IDD Power Save software enabled 4 2 mA IDD RX on Receive 91 dBm with 1 Mbps modulated signal at antenna port 198 IDD TX on 802 116 18 dBm 237 mA Measured at 11 Mbps IDD TX on 802 119 16 dBm 226 mA Measured at 6 Mbps Note 1 Current Consumption values represent Typical Peak currents and the measured current conditions were done with 85 duty cycle modulated signal Wi Fi applications typically operate at less than 85 TX duty cycle TX current is dependent on such criteria as transmit power setting and transmit data rate and bandwidth being used RX current is affected by connection distance 2 Power Save current is current consumed during periods of stand by between DTIM beacons The module will awake 2 ms before a DTIM and turn on its receiver and possibly its transmitter if data is available 2012 Microchip Technology Inc Advance Information DS70686A page 27 MRF24WGOMA MB TABLE 4 5 RECEIVER AC CHARACTERISTICS Parameters Min Typ Max Units Flo 2412 2484 MHz RX Min Input Level Sensitivity 1 Mbps 8 PER 95 dBm RX Min Input Level Sensitivity 2 Mbps 8 PER 88 dBm RX Max Input Level Power 1 Mbps 8 PER m 4 dBm RX
7. MRF24WGOMA MB interfaces to Microchip PIC18 PIC24 dsPIC33 and PIC32 microprocessors with a minimal of external components through digital only connections This section details use of the module starting with an example host connection as shown in Figure 2 1 2 1 Schematic FIGURE 2 1 MRF24WGOMA MB EXAMPLE APPLICATION SCHEMATIC 3 3V U1 4x MRF24WGOMA 4 7 System gt Reset Controller R To Host 47 ja DEBUG_TX Microcontroller DEBUG_RX GND c NC JE 1 0 CS To Host HIBERNATE 3 3 R4 GND 4 7 Note The example application schematic is for suggested design purposes Please refer to Table 1 1 in Section 1 0 Device Overview for the module pin descriptions AN VNOO9MTCIHN MRF24WGOMA MB 2 2 The internal regulators for the digital and analog core power supplies are disabled by driving the HIBERNATE pin high Figure 2 2 shows the power up sequence for MRF24WGOMA MB There is an internal Power on Reset POR circuit which keeps the module in reset until VDD is within specification The Hibernate and Reset signals are also used to control startup In Figure 2 2 section A is controlled by the internal POR and section B is an Power On Sequence allowance for the SPI bus to stabilize when the module supplies are enabled Once Hibernate is disabled the host software provides 1 5 of startup to allow the SPI to stabilize This time is pre
8. Max Input Level Power 2 Mbps 8 PER 4 dBm Note 1 Nominal conditions 25 C 3 3V 2437 MHz measurements at antenna port TABLE 4 6 TRANSMITTER AC CHARACTERISTICS Parameters Min Typ Max Units Flo 2412 2484 MHz Average transmit spectrum mask compliant 18 dBm Average POUT gain step resolution from 5 to 10 dBm 0 5 dB Average Pour gain step resolution from 5 to 2 1 0 dB Note 1 Nominal conditions 25 C VDD 3 3V Flo 2437 MHz 2 Mbps modulated signal measured at antenna port 2 Gain step control is not calibrated Steps are shown for planning purposes only DS70686A page 28 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB FIGURE 4 1 SPI INPUT TIMING i i le TCSD i TSCK cs IF za l 1 ma TCSS 1 1 SCK X 7 TSU THD f SI x MSb In X X X YA LSbin SO High Impedance 7 Note 1 CS must be toggled for each SPI block transfer FIGURE 4 2 SPI OUTPUT TIMING cs ff MEE r TSCK 1 1 1 a GO l Tv E gt TDIS i H i 1 msbou X X B LSbout X Don t Care S Lsbin X TABLE 4 7 SPI INTERFACE AC CHARACTERISTICS Symbol Parameters Min Max Units TSCK SCK Period 40 ns
9. bulk capacitance Supplies should be provisioned to supply sufficient charge on release of hibernate for desired start time or sufficient delay must be provided in software after hibernate release and before releasing reset This state provides the best battery life for embedded products Entering Hibernate for intervals of less than 30 seconds is not likely to save power Battery life expectation can be more than a year for devices operating on AA cells that would be in Hibernate except to wake up every hour for a small data transfer 500 Bytes 2 3 2 POWER SAVE PS MODE The PS mode is a low power dynamic state that automatically implements the 802 11 Power Save feature In this mode if enabled the module will enter PS mode when all activity is complete The module will wake autonomously to any PIC intervention so it can check DTIM beacons from the Access Point If any traffic is listed as queued for the module then it will awaken and get the data from the Access Point on the next possible opportunity When data is acquired the module will interrupt the PIC microcontroller on a normal data available indication If no data is available on a DTIM check the module reenters the Power Save state until the next DTIM The DTIM interval is programmed at the Access Point This state can provide as if on behavior of the radio with a significant power savings versus always on The battery life expectation of this mode is several day
10. modifications could void the user s authority to operate the equipment The end user must comply with all of the instructions provided by the Grantee which indicate installation and or operating conditions necessary for compliance The MRF24WGOMA MB module has been tested and conforms to EN 300 328 V1 7 1 2006 10 European Standards The module tests can be applied toward final product certification and Declaration of Conformity DoC Additional testing may be required depending on the end application The integrator may still be responsible for testing the end product for any additional compliance requirements that become necessary with this module installed for example digital device emission PC peripheral requirements etc in the specific country that the end device will be marketed For more information on regulatory compliance refer to the specific country radio regulations in the following sections 3 1 United States The MRF24WGOMA MB has received Federal Communications Commission FCC 47 Telecommunications Part 15 Subpart Intentional Radiators 15 247 and modular approval in accordance with Part 15 212 Modular Transmitter approval The MRF24WGOMA MB module can be integrated into a finished product without obtaining subsequent and separate FCC approvals for intentional radiation The MRF24WGOMA MB module has been labeled with its own FCC ID number and if the FCC ID is not visible when the module is i
11. page 3 MRF24WGOMA MB NOTES DS70686A page 4 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 1 0 DEVICE OVERVIEW The MRF24WGOMA and MRF24WGOMB low power 2 4 GHz IEEE 802 11 compliant surface mount modules with all associated RF components crystal oscillator bypass and bias passives with integrated MAC baseband RF and power amplifier and built in hardware support for AES and TKIP WEP WPA WPA2 security The modules also provide acceleration for hosts running WPA EAP application security The integrated module design frees the designer from RF and antenna design tasks and regulatory compliance testing ultimately providing quicker time to market The MRF24WGOMA module is approved for use with the integrated PCB meander antenna The MRF24WGOMB module comes with an ultra miniature coaxial connector U FL and is approved for use with a list of antenna types that are certified with the module See Section2 7 External Antenna for specific recommendations The MRF24WGOMA MB modules are designed to be used with Microchip s TCP IP software stack The soft ware stack has an integrated driver that implements the API that is used in the modules for command and control and for management and data packet traffic The Microchip TCP IP software stack is available in the free Microchip Application Libraries download including example applications and source code from the Microchip we
12. programmed into the host driver and may need to be increased if sufficient initial drive current is not provided to the MRF24WGOMA MB module Section C is the driver controlled release from Reset period This takes approximately 300 mS and is monitored by the stack driver No additional time needs to be provided by user software for startup FIGURE 2 2 MRF24WGOMA MB POWER ON SEQUENCE TIMING 1 ms SPI Host driver auto timed boot POR Stabilize approximately 50 300 ms after Reset Ready A Y M TN A B C VDD 2 7V p Time DS70686A page 12 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 2 3 Power States The MRF24WGOMA MB has several power states These are Hibernate Sleep and Active two sub states as shown in Figure 2 3 The selection of power state directly affects system behavior and overall power consumption or battery life There is also a Stand by state that is not user controlled 2 3 1 HIBERNATE STATE An Off state is defined as no power applied to the device The Hibernate mode is the closest to controlled off that the module can approach It is controlled through the HIBERNATE pin high input puts the module into Hibernate When in Hibernate the module only consumes leakage current but does not maintain state Hibernate has to be fully controlled by the PIC MCU and requires the TCP IP stack to restart on an awake The module contains about 70 UF of internal
13. types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Conform ment la r glementation d Industrie Canada le pr sent metteur radio peut fonctionner avec une antenne d un type et d un gain maximal ou inf rieur approuv pour l metteur par Industrie Canada Dans le but de r duire les risques de brouillage radio lectrique l intention des autres utilisateurs il faut choisir le type d antenne et son gain de sorte que la puissance isotrope rayonn e quivalente p i r e ne d passe pas l intensit n cessaire l tablissement d une communication satisfaisante Immediately following the above notice the manufacturer shall provide a list of all antenna types approved for use with the transmitter indicating the maximum permissible antenna gain in dBi and required impedance for each Approved external antenna types for the MRF24WGOMA MB module are listed in Table 2 2 in Section 2 0 Circuit Description 3 2 2 HELPFUL WEB SITES Industry Canada http www ic gc ca 2012 Microchip Technology Inc Advance Information DS70686A page 23 MRF24WGOMA MB 3 3 Europe The MRF24WGOMA MB module conforms to the emission standards summarized in Table 3 1 The module tests can be applied toward product certification and Declaration of Conformity DoC Note To maintain conformance tested ETSI s
14. up or pull down in case the host is likely to tri state the signal during power down modes The constant drive is used to ensure defined operation of the part and to minimize leakage current during low power modes 2 WP is used as write protect for the internal module SPI Flash For production use this pin should be pulled low This pin can be controlled by the host microcontroller to enable in field Flash updates 3 Signals of Type NC were JTAG function pins on previous family devices Signals on these pins will have no functional affect and will not impact the operation of this device 2012 Microchip Technology Inc Advance Information DS70686A page 7 MRF24WGOMA MB 1 2 Mounting Details The MRF24WGOMA MB is a surface mountable mod ule Module dimensions are shown in Figure 1 3 The module Printed Circuit Board PCB is 1 mm thick with castellated mounting points on two sides FIGURE 1 3 MRF24WGOMA MB MODULE PHYSICAL DIMENSIONS 36 24 65mm 19 2 tmm 18 6mm EN 2 70mm 1 25mm Note Antenna connector on MRF24WGOMB only Advance Information 2012 Microchip Technology Inc DS70686A page 8 MRF24WGOMA MB Figure 1 4 shows the recommended host PCB footprint For best performance mount the module on the PCB for the module without metal obstructions in the keep out area of The MRF24WGOMA has an integrated PCB antenna Figure 1 4 The antenna is tuned to have FR4 PCB
15. 10 20 mm DS70686A page 16 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB FIGURE 2 5 SIMULATED TWO DIMENSIONAL RADIATION PATTERN Name Theta Angle Mag Curve Information Average mi 60 0000 60 0000 0 6323 db GainTotal 0 0097 m2 20 0000 20 0000 0 3962 CE T m3 30 0000 30 0000 0 1038 TA e oe ain lota 9 m4 100 0000 100 0000 0 9490 Setup 2 Las Adap m5 _ 170 0000 170 0000 0 1414 Two dimensional 2D pattern including the average on main radiation planes Phi 0 and 90 degrees Freq 2 44 GHZ Phi 0 deg Radiation Pattern 1 0 180 2012 Microchip Technology Inc Advance Information DS70686A page 17 MRF24WGOMA MB FIGURE 2 6 SIMULATED THREE DIMENSIONAL RADIATION PATTERN Radiation pattern against the module dimensions DS70686A page 18 Advance Information 2012 Microchip Technology Inc Bojouuoe 2102 eoueApy 61 9890 580 FIGURE 2 7 SIMULATED THREE DIMENSIONAL RADIATION PATTERN dB GainTotal 7637 001 37 4 001 512 001 46560e 000 07886 0006 6927e 000 50656 000 92013 000 53 1 147 9 000 7617 2 808 37552 800 98935e 000 513109 2169e 008 8307e 000 4445e 008
16. 11g TX power with control Integrated low phase noise VCO RF frequency synthesizer PLL loop filter and PA Integrated RSSI ADC and DACs RSSI readings available to host MAC Baseband Features Hardware CSMA CA access control automatic ACK and FCS creation and checking Automatic MAC packet retransmit Hardware Security Engine for AES and RC4 based ciphers Supports 802 1x 802 11 security WEP WPA PSK and WPA 2 PSK Supports Infrastructure Adhoc Wi Fi Direct Client Implements Wi Fi Protected Setup WPS and SoftAP for easy product commissioning Applications Utility and Smart Energy Thermostats Smart Meters White Goods HVAC Consumer Electronics Remote Control Internet Radio Home Security Toys Industrial Controls Chemical Sensors HVAC Security Systems M2M Communication Remote Device Management Location and Asset Tracking Automotive Code Update Retail POS Terminals Wireless Price Tags Digital Remote Medical Fitness and Health Care Glucose Meters Fitness Equipment Patient Asset Tracking 2012 Microchip Technology Inc Advance Information DS70686A page 1 MRF24WGOMA MB Pin Diagram GND 1 GND NC 2 SDI NC 3 SCK NC 4 INT 5 500 6 RESET 7 GND NC 8 VDD NC 9 GND GND 10 DEBUG_TX NC 11 DEBUG_RX NC 12 GND NC 13 NC NC 14 CS NC 15 NC WP 16 NC VDD 17
17. Administrations CEPT http www cept org European Telecommunications Standards Institute ETSI http www etsi org European Radio Communications Office ERO http www ero dk TABLE 3 1 EMISSIONS STANDARDS TESTED Specification Test Method Emission Standards EN 300 328 V1 7 1 2006 10 4 3 1 Maximum Transmit Power 5 7 2 EN 300 328 V1 7 1 2006 10 4 3 2 Maximum EIRP Spectral Density 5 7 3 EN 300 328 V1 7 1 2006 10 4 3 3 Frequency Range 5 7 4 EN 300 328 V1 7 1 2006 10 4 3 6 Transmitter Spurious Emissions 5 7 5 EN 300 328 V1 7 1 2006 10 4 3 7 Receiver Spurious Emissions 5 7 6 DS70686A page 24 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 3 4 Other Regulatory Jurisdictions Should other regulatory jurisdiction certification be required by the customer or the customer need to recertify the module for other reasons a certification utility is available The utility runs on a Window s PC and utilizes a USB to SPI converter to interface to the MRF24WGOMA MB module In order to use the utility the MRF24WGOMA MB module must be out of reset and not accessed by the system host That is the SPI signals to the MRF24WGOMA MB module must be tri state with Reset and Hibernate deasserted The fol lowing signals will need to be brought from the MRF24WGOMA MB module for connection to the PC through the USB adapter SDO SDI CS SCK
18. EELOG code hopping devices Serial EEPROMs microperipherals nonvolatile memory and analog products In addition Microchip s quality system for the design and manufacture of development systems is ISO 9001 2000 certified 2012 Microchip Technology Inc Advance Information DS70686A page 37 MICROCHIP Worldwide Sales and Service AMERICAS Corporate Office 2355 West Chandler Blvd Chandler AZ 85224 6199 Tel 480 792 7200 Fax 480 792 7277 Technical Support http Awww microchip com support Web Address www microchip com Atlanta Duluth GA Tel 678 957 9614 Fax 678 957 1455 Boston Westborough MA Tel 774 760 0087 Fax 774 760 0088 Chicago Itasca IL Tel 630 285 0071 Fax 630 285 0075 Cleveland Independence OH Tel 216 447 0464 Fax 216 447 0643 Dallas Addison TX Tel 972 818 7423 Fax 972 818 2924 Detroit Farmington Hills MI Tel 248 538 2250 Fax 248 538 2260 Indianapolis Noblesville IN Tel 317 773 8323 Fax 317 773 5453 Los Angeles Mission Viejo CA Tel 949 462 9523 Fax 949 462 9608 Santa Clara Santa Clara CA Tel 408 961 6444 Fax 408 961 6445 Toronto Mississauga Ontario Canada Tel 905 673 0699 Fax 905 673 6509 ASIA PACIFIC Asia Pacific Office Suites 3707 14 37th Floor Tower 6 The Gateway Harbour City Kowloon Hong Kong Tel 852 2401 1200 Fax 852 2401 3431 Australia Sydney Tel 61 2 9868 6733 Fax 61 2 9868 6755 China Beijin
19. For best performance follow the mounting details shown in Figure 1 4 PCB material under the antenna FIGURE 1 4 RECOMMENDED HOST PCB FOOTPRINT material underneath the module Do not cut out host e1 0mm a 1 73mm 1 27 31 0mm o T 7 68mm 0 85mm 19 5mm 0 65mm 8 65mm 28 00mm Note 1 The Note 1 demarcation specifies the host PCB copper plane keep out area on underlying board layers It is permissible to route surface escape traces in this area 2012 Microchip Technology Inc Advance Information DS70686A page 9 MRF24WGOMA MB Figure 1 5 illustrates the module reflow profile that is recommended for mounting the device onto the host PCB FIGURE 1 5 PRELIMINARY MODULE REFLOW PROFILE AND SETPOINTS Zones 1 1213 4151617 8 300 250 200 Hi o 150 o E 100 50 a 1 0 50 100 150 200 250 300 Time Seconds TABLE 1 2 MODULE REFLOW PROFILE Zone 1 2 3 4 5 6 7 8 Temperature C 180 180 200 200 200 220 265 270 Note 1 Conveyor Speed 90 cm min DS70686A page 10 Advance Information 2012 Microchip Technology Inc oul 2102 eoueApy LL 7 9890 58 2 0 CIRCUIT DESCRIPTION The
20. HIBERNATE GND 18 GND Note Antenna connector on MRF24WGONB only DS70686A page 2 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB Table of Contents 1 0 Device Overview 5 2 0 Circuit Description 11 3 0 Ce rieaieuuc M 21 40 Electrical GhiaracteristiCs ioci rcnt 27 Appendix Revision HISTOrY 31 The Microchip Web Site oo eeeeceeeeseeseeeeeeeeeeeeseeeeecaeeeeecaecaeeeaesaeesaesaeesaeeaeeeaesaeeeaesaeseaecaeseeeneseaesaeseeesaeseeseaeseeesaeeaeseaeseeeeaeeneesaeeeeeeaeeate 33 Customer Change Notification Service is iieri ien tra entr E cH ka ELE EX SR FR RIEN ERR AURI aad cvaadeastacandsisanesaadvasiaiiads 33 GU STOM oo oT 33 Reader RESPONSE RE cit tn eee reda By E E Ree e 34 Product Identification er 35 TO OUR VALUED CUSTOMERS It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products To this end we will continue to improve our publications to better suit your needs Our publications will be refined and enhanced as new volumes and updates are introduced If you have any questions or comments regarding this publication please contact the Marketing Co
21. IC and UNI O are registered trademarks of Microchip Technology Incorporated in the U S A and other countries FilterLab Hampshire HI TECH C Linear Active Thermistor MXDEV MXLAB SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U S A Analog for the Digital Age Application Maestro BodyCom chipKIT chipKIT logo CodeGuard dsPICDEM dsPICDEM net dsPlCworks dsSPEAK ECAN ECONOMONITOR FanSense HI TIDE In Circuit Serial Programming ICSP Mindi MPASM MPLAB Certified logo MPLIB MPLINK mTouch Omniscient Code Generation PICC PICC 18 PICDEM PICDEM net PICkit PICtail REAL ICE rfLAB Select Mode Total Endurance TSHARC UniWinDriver WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U S A and other countries SQTP is a service mark of Microchip Technology Incorporated in the U S A All other trademarks mentioned herein are property of their respective companies 2012 Microchip Technology Incorporated Printed in the U S A Rights Reserved e Printed on recycled paper ISBN 978 1 62076 496 1 Microchip received ISO TS 16949 2009 certification for its worldwide headquarters design and wafer fabrication facilities in Chandler and Tempe Arizona Gresham Oregon and design centers in California and India The Company s quality system processes and procedures are for its PIC MCUs and dsPIC DSCs K
22. MICROCHIP MRF24WGOMA MB MRF24WG0MA MB Data Sheet 2 4 GHz IEEE 802 11b g Features EEE 802 11 compliant RF transceiver Serialized unique MAC address Data rate 1 to 11 Mbps for 802 116 6 to 54 Mbps for 802 110 Compatible with IEEE 802 11b g n networks Small size 21 mm x 31 mm 36 pin Surface Mount module Integrated PCB antenna MRF24WGOMA External antenna option MRF24WGOMB with ultra miniature coaxial U FL connector Easy integration into final product accelerates product development provides quicker time to market Radio regulation certification for United States FCC Canada IC and Europe ETSI Designed for use with Microchip microcontroller families PIC18 PIC24 dsPIC33 and PIC32 with downloadable Microchip TCP IP Stack Operational Single operating voltage 2 8V to 3 6V 3 3V typical Temperature range 40 C to 85 C Simple four wire SPI interface with interrupt Low current consumption RX mode 156 mA typical TX mode 240 mA 18 dBm typical PS mode 4 mA typical Hibernate mode 0 1 mA typical RF Analog Features ISM Band 2 400 to 2 484 GHz operation 14 Channels selectable individually or domain restricted DSSS OFDM modulation Application throughput 4500 kbps 95 dBm Typical sensitivity at 1 Mbps 18 dBm Typical 802 11b TX power with control 16 dBm Typical 802
23. TCSD CS High time 50 ns Tcss CS Setup time 50 ns TCSH CS Hold time 50 ns TSU SDI Setup time 10 ns THD SDI Hold time 10 ns TV SDO Valid time 15 ns 2012 Microchip Technology Inc Advance Information DS70686A page 29 MRF24WGOMA MB NOTES DS70686A page 30 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB APPENDIX A REVISION HISTORY Revision A August 2012 This is the initial released version of the document 2012 Microchip Technology Inc Advance Information DS70686A page 31 MRF24WGOMA MB NOTES DS70686A page 32 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB THE MICROCHIP WEB SITE Microchip provides online support via our WWW site at www microchip com This web site is used as a means to make files and information easily available to customers Accessible by using your favorite Internet browser the web site contains the following information Product Support Data sheets and errata application notes and sample programs design resources user s guides and hardware support documents latest software releases and archived software General Technical Support Frequently Asked Questions FAQs technical support requests online discussion groups Microchip consultant program member listing Business of Microchip Product selector and ordering guides latest Microchip press releases listing of semina
24. Three dimensional 3D pattern and magnitude distribution AN VNO9MTCIHN MRF24WGOMA MB 2 7 External Antenna The MRF24WGOMB module has a 500 ultra miniature coaxial U FL connector to connect to an external 2 4 GHz antenna Caution The U FL connector is fragile and can only tolerate a insertions very limited number The choice of antenna is limited to the antenna types the module has been tested with Refer to the respec tive country in Section 3 0 Regulatory Approval for a list of tested and approved antenna types that may be used with the MRF24WGOMB module A list of antennas approved for use with the module is provided in Table 2 2 TABLE 2 2 APPROVED EXTERNAL ANTENNA TYPES Type Manufacturer Part Number Gain Dipole Aristotle RFA 02 C2M2 D034 2 dBi PCB Aristotle RFA 02 P33 D034 1 dBi PCB Aristotle RFA 02 P05 D034 2 dBi PIFA Aristotle RFA 02 G03 D034 0 dBi DS70686A page 20 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 3 0 REGULATORY APPROVAL The MRF24WGOMA MB module has received regulatory approvals for modular devices in the United States and Canada Modular approval allows the end user to place the MRF24WGOMA MB module inside a finished product and not require regulatory testing for an intentional radiator RF transmitter provided no changes or modifications are made to the module circuitry Changes or
25. ance of 20 cm or more should be maintained between the antenna of this device and persons during operation To ensure compliance operation at closer than this distance is not recommended The antenna s used for this transmitter must not be co located or operating in conjunction with any other antenna or transmitter If the MRF24WGOMA MB module is used in a portable application i e the antenna is less than 20 cm from persons during operation the integrator is responsible for performing Specific Absorption Rate SAR testing in accordance with FCC rules 2 1091 3 1 2 APPROVED EXTERNAL ANTENNA TYPES To maintain modular approval in the United States only the antenna types that have been tested shall be used It is permissible to use different antenna manufacturer provided the same antenna type and antenna gain equal to or less than is used Testing of the MRF24WGOMB module was performed with the antenna types listed in Table 2 2 in Section 2 0 Circuit Description 3 1 3 HELPFUL WEB SITES Federal Communications Commission FCC http www fcc gov 3 2 Canada The MRF24WGOMA MB module has been certified for use in Canada under Industry Canada IC Radio Standards Specification RSS RSS 210 and RSS Gen Modular approval permits the installation of a module in a host device without the need to recertify the device Labeling Requirements for the Host Device from Section 3 2 1 RSS Gen Issue 3 December 2010
26. b site http Awww microchip com wireless The combination of the module and a PIC running the TCP IP stack results in support for IEEE Standard 802 11 and IP services For example this allows the immediate implementation of a wireless web server and e mail clients The MRF24WGOMA MB modules have received regu latory approvals for modular devices in the United States FCC Canada IC and Europe ETSI The modular approval removes the need for expensive RF and antenna design and allows the end user to place the modules inside a finished product and not require regulatory testing for an intentional radiator RF trans mitter See Section 3 0 Regulatory Approval for the specific requirements that should be adhered to by the integrator 1 1 Interface Description The block diagram in Figure 1 1 represents a MRF24WGOMA MB module It interfaces to Microchip PIC18 PIC24 dsPIC33 or PIC32 microcontrollers through a four wire serial slave SPI interface interrupt hibernate reset power and ground signals The module runs on a single supply voltage of nominally 3 3V The serial trace port operates at 3 3V and requires a level shifter for operation with RS 232 devices This port provides a serial output of module status messages and is helpful for debugging purposes Figure 1 2 shows a simplified example connection between a Microchip PIC MCU and the module Table 1 1 lists the pin descriptions Data communications with th
27. e MRF24WGOMA MB are through the SPI interface that is detailed in Section 2 0 Circuit Description The Microchip PIC microcon troller communicates with the module through a com mand from within the Microchip TCP IP stack The command is detailed in the Microchip TCP IP stack online Help that is included in the free Microchip Application Libraries download 2012 Microchip Technology Inc Advance Information DS70686A page 5 MRF24WGOMA MB FIGURE 1 1 MRF24WGOMA MB BLOCK DIAGRAM MRF24WGOMA NB 2 4 GHz IEEE 802 11b g Module BESTE E Save SPI SPI Flash Encryption Interface WPA Engine Jp Interrupt IEEE 802 11b g Internal i Power 2 4 GHz MAC LLC Regulators T Transceiver PA Hibernais IEEE 802 11b g PHY RAM Ge Trace Fe Matching D Reset Circuitr 802 1x EAP MRF24WGOMA 4 Accelerator ROM FIGURE 1 2 MICROCONTROLLER TO MRF24WGOMA MB INTERFACE MRF24WGOMx PIC Microcontroller External Antenna jum lt q l MRF24WGOMB 6 es nm SDI SDO SDO 501 SCK m SCK NT gt INTX 3 3V Typ gt VDD HIBERNATE lt yo GND gt GND 4 10 RESET 44 3 1 0 DS70686A page 6 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB
28. e est susceptible d en compromettre le fonctionnement DS70686A page 22 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 3 2 1 APPROVED EXTERNAL ANTENNA TYPES Transmitter Antenna from Section 7 1 2 RSS Gen Issue 3 December 2010 The MRF24WGOMB module can only be sold or operated with antennas with which it was approved Transmitter may be approved with multiple antenna types An antenna type comprises antennas having similar in band and out of band radiation patterns Testing shall be performed using the highest gain antenna of each combination of transmitter and antenna type for which approval is being sought with the transmitter output power set at the maximum level Any antenna of the same type having equal or lesser gain as an antenna that had been successfully tested with the transmitter will also be considered approved with the transmitter and may be used and marketed with the transmitter When a measurement at the antenna connector is used to determine RF output power the effective gain of the device s antenna shall be stated based on measurement or on data from the antenna manufacturer For transmitters of output power greater than 10 milliwatts the total antenna gain shall be added to the measured RF output power to demonstrate compliance to the specified radiated power limits User manuals for transmitters shall display the following notice in a conspicuous location U
29. e no copper trace It is recommended that the module be mounted on the edge of the host PCB It is permitted for PCB material to be below the antenna structure of the module as long as no copper traces or planes are on the host PCB in that area For best performance place the module on the host PCB according to the details shown in Figure 1 4 in Section 1 0 Device Overview The antenna patterns shown in the following plots are simulated results of the PCB antenna Figure 2 4 illus trates the simulation drawing and Figure 2 5 and Figure 2 6 illustrate the two dimensional 2D and three dimensional 3D radiation patterns The calculated average of the radiated field is shown in Figure 2 5 highlighted in yellow The radiation pattern for the XZ plane is shown in red and the YZ plane is shown in black As shown the most powerful radiation occurs in the XY plane the red pattern Figure 2 6 shows the relative position of the 3D radia tion donut with reference to the module orientation This is a very useful guide for placement of the module to obtain the maximum range Figure 2 7 shows the 3D radiation pattern with the col ored distribution of the radiation magnitude The values range from 9 dB to 0 3 dB This is very useful in interpreting the 2D radiation pattern 2012 Microchip Technology Inc Advance Information DS70686A page 15 MRF24WGOMA MB FIGURE 2 4 PCB ANTENNA SIMULATION DRAWING 0
30. g Tel 86 10 8569 7000 Fax 86 10 8528 2104 China Chengdu Tel 86 28 8665 5511 Fax 86 28 8665 7889 China Chongqing Tel 86 23 8980 9588 Fax 86 23 8980 9500 China Hangzhou Tel 86 571 2819 3187 Fax 86 571 2819 3189 China Hong Kong SAR Tel 852 2401 1200 Fax 852 2401 3431 China Nanjing Tel 86 25 8473 2460 Fax 86 25 8473 2470 China Qingdao Tel 86 532 8502 7355 Fax 86 532 8502 7205 China Shanghai Tel 86 21 5407 5533 Fax 86 21 5407 5066 China Shenyang Tel 86 24 2334 2829 Fax 86 24 2334 2393 China Shenzhen Tel 86 755 8203 2660 Fax 86 755 8203 1760 China Wuhan Tel 86 27 5980 5300 Fax 86 27 5980 5118 China Xian Tel 86 29 8833 7252 Fax 86 29 8833 7256 China Xiamen Tel 86 592 2388138 Fax 86 592 2388130 China Zhuhai Tel 86 756 3210040 Fax 86 756 3210049 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 Fax 91 80 3090 4123 India New Delhi Tel 91 11 4160 8631 Fax 91 11 4160 8632 India Pune Tel 91 20 2566 1512 Fax 91 20 2566 1513 Japan Osaka Tel 81 66 152 7160 Fax 81 66 152 9310 Japan Yokohama Tel 81 45 471 6166 Fax 81 45 471 6122 Korea Daegu Tel 82 53 744 4301 Fax 82 53 744 4302 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Malaysia Kuala Lumpur Tel 60 3 6201 9857 Fax 60 3 6201 9859 Malaysia Penang Tel 60 4 227 8870 Fax 60 4 227 4068 Philippines Manila Tel 63 2 634 9065 Fa
31. ice Module Module and Temperature a MRF24WGOMA I RM Industrial Temp Type Reel Range Device MRF24WGOMA MB VDD range 2 8V to 3 60V Temperature Range 40 to 85 C Industrial Temperature 2012 Microchip Technology Inc Advance Information DS70686A page 35 MRF24WGOMA MB NOTES DS70686A page 36 Advance Information 2012 Microchip Technology Inc Note the following details of the code protection feature on Microchip devices Microchip products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip are committed t
32. mmunications Department via E mail at docerrors microchip com or fax the Reader Response Form in the back of this data sheet to 480 792 4150 We welcome your feedback Most Current Data Sheet To obtain the most up to date version of this data sheet please register at our Worldwide Web site at http Awww microchip com You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page The last character of the literature number is the version number e g DS30000A is version A of document DS30000 Errata An errata sheet describing minor operational differences from the data sheet and recommended workarounds may exist for current devices As device documentation issues become known to us we will publish an errata sheet The errata will specify the revision of silicon and revision of document to which it applies To determine if an errata sheet exists for a particular device please check with one of the following Microchip s Worldwide Web site http www microchip com Your local Microchip sales office see last page When contacting a sales office please specify which device revision of silicon and data sheet include literature number you are using Customer Notification System Register on our web site at www microchip com to receive the most current information on all of our products 2012 Microchip Technology Inc Advance Information DS70686A
33. n be connected to commercially available RS 232 line drivers receivers with appropriate external level shifters The serial interface operates at 19200 8 N 1 N 2 5 SPI Interface The slave Serial Peripheral Interface SPI is used to interface with the host PIC microcontroller The slave SPI interface works with the Interrupt line INT When data is available for the PIC microcontroller during operation the INT line is asserted logic low by the MRF24WGOMA MB module The INT line is de asserted logic high by the MRF24WGOMA MB after the data is transferred to the host PIC microcontroller The SPI SCK frequency can be up to 25 MHz The slave SPI interface implements the CPOL 0 0 and CPOL 1 1 modes 0 and 3 of operation That is data is clocked in on the first rising edge of the clock after Chip Select CS is asserted Data is placed on the bus with most significant bit MSb first The CS pin must be toggled with transfer blocks and cannot be held low permanently The falling edge of CS is used to indicate the start of a transfer The rising edge of CS is used to indicate the completion of a transfer Figure 4 1 in Section 4 0 Electrical Characteris tics shows the SPI timing diagram Table 4 7 details the SPI timing AC characteristics 2 6 PCB Antenna For the MRF24WGOMA the PCB antenna is fabricated on the top copper layer and covered in solder mask The layers below the antenna hav
34. nder Industry Canada regulations this radio transmitter may only operate using an antenna of a type and maximum or lesser gain approved for the transmitter by Industry Canada To reduce potential radio interference to other users the antenna type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication Conform ment la r glementation d Industrie Canada le pr sent metteur radio peut fonctionner avec une antenne d un type et d un gain maximal ou inf rieur approuv pour l metteur par Industrie Canada Dans le but de r duire les risques de brouillage radio lectrique l intention des autres utilisateurs il faut choisir le type d antenne et son gain de sorte que la puissance isotrope rayonn e quivalente p i r e ne d passe pas l intensit n cessaire l tablissement d une communication satisfaisante The above notice may be affixed to the device instead of displayed in the user manual User manuals for transmitters equipped with detach able antennas shall also contain the following notice in a conspicuous location This radio transmitter identify the device by certifi cation number or model number if Category has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna
35. nstalled inside another device then the outside of the finished product into which the module is installed must also display a label referring to the enclosed module This exterior label can use wording as follows Contains Transmitter Module FCC ID W7OMRF24WGOMAMB Contains ID W7OMRF24WGOMAMB 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 A user s manual for the product should include the following statement 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
36. o continuously improving the code protection features of our products Attempts to break Microchip s code protection feature may violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to sue for relief under that Act Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates It is your responsibility to ensure that your application meets with your specifications MICROCHIP MAKES REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED WRITTEN OR ORAL STATUTORY OR OTHERWISE RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ITS CONDITION QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR PURPOSE Microchip disclaims all liability arising from this information and its use Use of Microchip devices in life support and or safety applications is entirely at the buyer s risk and the buyer agrees to defend indemnify and hold harmless Microchip from any and all damages claims Suits or expenses resulting from such use No licenses are conveyed implicitly or otherwise under any Microchip intellectual property rights QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV SO TS 16949 Trademarks The Microchip name and logo the Microchip logo dsPIC KEELOQ KEELOQ logo MPLAB PIC PlCmicro PICSTART PIC logo rfP
37. rs and events listings of Microchip sales offices distributors and factory representatives CUSTOMER CHANGE NOTIFICATION SERVICE Microchip s customer notification service helps keep customers current on Microchip products Subscribers will receive e mail notification whenever there are changes updates revisions or errata related to a specified product family or development tool of interest To register access the Microchip web site at www microchip com Under Support click Customer Change Notification and follow the registration instructions CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels Distributor or Representative Local Sales Office Field Application Engineer FAE Technical Support Development Systems Information Line Customers should contact their distributor representative or field application engineer FAE for support Local sales offices are also available to help customers A listing of sales offices and locations is included in the back of this document Technical support is available through the web site at http microchip com support 2012 Microchip Technology Inc Advance Information DS70686A page 33 MRF24WGOMA MB READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product If you wish to provide your comments on organi
38. s to several weeks This mode is characterized by a very low latency as low as 200 ms to begin data transfer from the state 2 3 3 ACTIVE STATE The Active state is identified as one of two states where the radio circuitry is fully on The two active states are the Receive state RX ON and the Transmit state TX ON 2 3 4 STAND BY STATE The Stand by state is not user controlled but is noted as it helps identify and track certain operations of the module during power tracing TABLE 2 1 MRF24WGOMA MB POWER STATE DEFINITIONS State cs Description Off OV OV Power is completely disconnected Hibernate 3 3V 3 3V All internal power regulators are OFF enabled by HIBERNATE pin Power Save 3 3V OV Enabled by TCP IP driver RX ON 3 3V OV Receive circuits are on and receiving TX ON 3 3V OV Transmit circuits are on and transmitting Stand by 3 3V OV State machine transition state only not user controlled 2012 Microchip Technology Inc Advance Information DS70686A page 13 MRF24WGOMA MB FIGURE 2 3 MRF24WGOMA MB POWER STATE DIAGRAM Note 1 See Section 2 2 Power On Sequence Power Save DS70686A page 14 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB 2 4 Serial Trace Port Interface The MRF24WGOMA NB incorporates a Transmit Data pin DEBUGTX and a Receive Data pin DEBUGRX for serial debugging purposes These pins ca
39. tandards the module shall not be modified The European Standards do not provide a modular approval similar to the USA FCC and Canada IC However the completed compliance testing can be used as part of the customer s application for product compliance approvals The module test report data can be used as part of the customer s product test plan and can significantly lower customer s compliance burden Depending on the end application additional testing may be required The integrator is responsible for test ing the end product for any additional compliance requirements that become necessary with this module installed for example digital device emission PC peripheral requirements and so on in the specific country where end device is marketed 3 3 1 EXTERNAL ANTENNA REQUIREMENTS European conformance testing was performed using the antenna types listed in Table 2 2 in Section 2 0 Circuit Description 3 3 2 HELPFUL WEB SITES A document that can be used as a starting point in understanding the use of Short Range Devices SRD in Europe is the European Radio Communications Committee ERC Recommendation 70 03 E which can be downloaded from the European Radio Communications Office ERO at http www ero dk Additional helpful web sites are Radio and Telecommunications Terminal Equipment R amp TTE http ec europa eu enterprise rtte index_en htm European Conference of Postal and Telecommunications
40. x 63 2 634 9069 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Hsin Chu Tel 886 3 5778 366 Fax 886 3 5770 955 Taiwan Kaohsiung Tel 886 7 536 4818 Fax 886 7 330 9305 Taiwan Taipei Tel 886 2 2500 6610 Fax 886 2 2508 0102 Thailand Bangkok Tel 66 2 694 1351 Fax 66 2 694 1350 EUROPE Austria Wels Tel 43 7242 2244 39 Fax 43 7242 2244 393 Denmark Copenhagen Tel 45 4450 2828 Fax 45 4485 2829 France Paris Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Munich Tel 49 89 627 144 0 Fax 49 89 627 144 44 Italy Milan Tel 39 0331 742611 Fax 39 0331 466781 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 Spain Madrid Tel 34 91 708 08 90 Fax 34 91 708 08 91 UK Wokingham Tel 44 118 921 5869 Fax 44 118 921 5820 11 29 11 Advance Information DS70686A page 38 2012 Microchip Technology Inc
41. zation clarity subject matter and ways in which our documentation can better serve you please FAX your comments to the Technical Publications Manager at 480 792 4150 Please list the following information and use this outline to provide us with your comments about this document TO Technical Publications Manager Total Pages Sent RE Reader Response From Name Company Address City State ZIP Country Telephone Application optional Would you like a reply Y N Device MRF24WGOMA MB Literature Number DS70686A Questions 1 What are the best features of this document 2 How does this document meet your hardware and software development needs 3 Do you find the organization of this document easy to follow If not why 4 What additions to the document do you think would enhance the structure and subject 5 What deletions from the document could be made without affecting the overall usefulness 6 Is there any incorrect or misleading information what and where 7 How would you improve this document DS70686A page 34 Advance Information 2012 Microchip Technology Inc MRF24WGOMA MB PRODUCT IDENTIFICATION SYSTEM To order parts including industrial or obtain information for e g on pricing or delivery refer to the factory or the listed sales office PART NO M X T X T T T Examples Dev
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