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MRF49XA
Data Sheet
ISM Band Sub-GHz
RF Transceiver
© 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C
Free Datasheet http://www.Datasheet4U.com

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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 to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a 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and may be superseded by updates.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 NO 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.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC 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, chipKIT,
chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,
Mindi, MiWi, 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.
© 2009-2011, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.
Printed on recycled paper.
DS70590C-page 2
ISBN: 978-1-61341-846-8
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, KEELOQ® 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.
Preliminary
© 2009-2011 Microchip Technology Inc.
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MRF49XA
ISM Band Sub-GHz RF Transceiver
Features
• Fully Integrated Sub-GHz Transceiver
• Supports Proprietary Sub-GHz Wireless Protocols
• 4-Wire Serial Peripheral Interface (SPI)
Compatible Interface
• CMOS/TTL Compatible I/Os
• Clock and Reset Signals for Microcontroller
• Integrated 10 MHz Oscillator Circuitry
• Integrated Low Battery Voltage Detector
• Supports Power-Saving modes
• Operating Voltage: 2.2V–3.8V
• Low-Current Consumption, Typically:
- 11 mA in RX mode
- 15 mA in TX mode
- 0.3 μA in Sleep mode
• Industrial Temperature Range
• 16-Pin TSSOP Package
RF/Analog Features
• Supports ISM Band Sub-GHz Frequency Ranges
(433 MHz, 868 MHz and 915 MHz)
• Modulation Technique: FSK with Frequency
Hopping Spread Spectrum (FHSS) Capability
• Supports High Data Rates:
- Digital mode 115.2 kbps, max.
- Analog mode 256 kbps, max.
• Differential RF Input/Output:
- -110 dBm Typical Sensitivity with 0 dBm
Maximum Input Level
- +7 dBm Typical Transmit Output Power
• High-Resolution Programmable Phase-Locked
Loop (PLL) Synthesizer
• Integrated Power Amplifier
• Integrated Low Phase Noise Voltage Controlled
Oscillator (VCO) Frequency
• Synthesizer and PLL Loop Filter
• Automatic Frequency Control (AFC)
Baseband Features
• Supports Programmable TX Frequency Deviation
and RX Baseband Bandwidth (BBBW)
• Analog and Digital RSSI Outputs with Dynamic
Range
• RX Synchronous Pattern Recognition
• 16-Bit RX Data FIFO
• Two 8-Bit TX Data Registers
• Low-Power Duty Cycle mode
• Advanced Adjacent Channel Rejection/Blocking
Capability
• Internal Data and Clock Recovery
• Supports Data Filtering
• Data Quality Indicator (DQI)
Typical Applications
• Home/Industrial Automation
• Remote Control
• Wireless PC Peripherals
• Remote Keyless Entry
• Vehicle Sensor Monitoring
• Telemetry
• Data Logging Systems
• Remote Automatic Meter Reading
• Security Systems for Home/Industrial
Environment
• Automobile Immobilizers
• Sports and Performance Monitoring
• Wireless Toy Controls
• Medical Applications
© 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 3
Free Datasheet http://www.Datasheet4U.com

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MRF49XA
Pin Diagram: 16-Pin TSSOP
SDI
SCK
CS
SDO
IRQ
FSK/DATA/FSEL
RCLKOUT/FCAP/FINT
CLKOUT
1 16
2 15
3 14
4 MRF49XA 13
5 12
6 11
7 10
89
INT/DIO
RSSIO
VDD
RFN
RFP
VSS
RESET
RFXTL/EXTREF
DS70590C-page 4
Preliminary
© 2009-2011 Microchip Technology Inc.
Free Datasheet http://www.Datasheet4U.com

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MRF49XA
Table of Contents
1.0 Introduction................................................................................................................................................................................... 7
2.0 Hardware Description................................................................................................................................................................... 9
3.0 Functional Description................................................................................................................................................................ 43
4.0 Application Details...................................................................................................................................................................... 73
5.0 Electrical Characteristics ............................................................................................................................................................ 79
6.0 Packaging Information................................................................................................................................................................ 89
Appendix A: Read Sequence and Packet Structures .......................................................................................................................... 93
Appendix B: Revision History............................................................................................................................................................... 95
The Microchip Web Site ....................................................................................................................................................................... 99
Customer Change Notification Service ................................................................................................................................................ 99
Customer Support ................................................................................................................................................................................ 99
Reader Response .............................................................................................................................................................................. 100
Product Identification System ............................................................................................................................................................ 101
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 Communications 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
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The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).
Errata
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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
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© 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 5
Free Datasheet http://www.Datasheet4U.com