MRF24J40 MRF24J40 Silicon Errata The MRF24J40 RF transceiver you have received conforms functionally to the Device Data Sheet (DS39776C), except for the anomalies described in this document. 1. Module: RX MAC 3. Module: RX MAC Under certain conditions, such as channel scanning, unexpected packets may be received at alternative channels spaced at 20 MHz intervals. This occurs when the interfering sources contain sufficient intensity and proximity to the receiver. If the RX filter is configured for Promiscuous mode, packets with a reserved packet type in the MAC frame type field may cause the RX module to put an incorrect packet length in the RX buffer. For example, if the device is tuned to the 2,425 MHz channel, spurious signals can be detected at 2,405 MHz, 2,445 MHz and 2,465 MHz. Work around Work around When operating in Promiscuous mode, flush the RX buffer by setting the RXFLUSH bit (RXFLUSH<0>) after every RX interrupt. To prevent this system degradation, do one of the following: Date Codes that pertain to this issue All engineering and production devices. 2. Module: Security Module When the device is performing encryption or decryption, there is a very small chance that the encryption or decryption result may be incorrect. Work around During decryption operations, repeat the decryption one or more times if a MIC error is indicated on the first attempt. During encryption operations, verify the encryption by immediately decrypting the packet and checking it against the original for errors. If an error is found, repeat the encryption and verification. Date Codes that pertain to this issue All engineering and production devices. 2015 Microchip Technology Inc. • Add a “Channel ID” to the “Frame Payload” of the MAC layer. This enables the firmware to filter out unexpected packets. • Increase the distance between the nodes. • Reduce the transmitted power of the other nodes. Date Codes that pertain to this issue All engineering and production devices. 4. Module: RX MAC After initializing the MRF24J40 and after successful reception and transmission of packets, the module suddenly stops receiving packets. At this stage, all register settings, SPI operations, and interrupts appear normal. Performing a reset on the module restores communications. This issue is seen on a very small percentage (<1%) of MRF24J40 modules (MRF24J40MA, MB, MC, MD, and ME). The issue is random and intermittent, which means that the time of the apparent issue only occurs at random times. A deterministic test has not been found to isolate the issue. DS80000299D-page 1 MRF24J40 Work around Please ensure that the Initialization settings for MRF24J40 is used as described in section 3.2 of the MRF24J40 Data Sheet (DS39776C). Specifically, use the following settings for the registers as these control the internal frequency synthesizer in the MRF24J40: RFCON0 (0x200) = 0x03 - Initialize RFOPT = 0x03 RFCON1 (0x201) = 0x02 - Initialize VCOOPT = 0x02 If the issue persists after performing the settings, one of the following workarounds can be implemented based on the type of customer application: • Reprogram the channel information (refer to the steps in Programming Channel Information) if the receiver is dormant (without receiving any packets). For example, if the device must receive a packet in a determined amount of time but no packet is received during the specified period, the host MCU can reprogram the channel information to resume packet reception. • In the customer main application while loop, continuously reprogram the channel information. Reprogramming channel information resets the internal RF State Machine and enables the module to start communicating with other devices. Programming Channel Information Perform the following steps: 1. Program RFCON0 (0x200 <7:4>) 2. Reset RF State Machine RFRST (RFCTL 0x36<2>) = 1 RFRST (RFCTL 0x36<2>) = 0 3. Delay at least 192 µs before attempting to transmit a packet to enable the RF circuitry to calibrate. For more information, refer to Section 3.4 of the MRF24J40 Data Sheet. Applications using MiWi Stack can call the MiApp function to perform the programming channel information: MiApp_SetChannel(uint8_t channelNum) Date Codes that pertain to this issue Issue appears in modules with MRF24J40 date codes from year 2013 to present. DS80000299D-page 2 2015 Microchip Technology Inc. MRF24J40 APPENDIX A: DOCUMENT REVISION HISTORY Rev A Document (12/2006) Original revision. Silicon errata issues 1 (RX MAC), 2 (SPI Interface), 3 (Security Module) and 4 (TX/RX PHY). Rev B Document (4/2007) Added silicon issue 5 (SPI Interface). Rev C Document (3/2009) Removed silicon issues 2 (SPI Interface, SDO pin) and 4 (TX/RX PHY) which were assimilated into the data sheet. Deleted issue 5 (SPI Interface). Added issue 3 (RX MAC). Rev D Document (6/2015) Added silicon issue 4 (RX MAC). 2015 Microchip Technology Inc. DS80000299D-page 3 MRF24J40 NOTES: DS80000299D-page 4 2015 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 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, FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, MediaLB, MOST, MOST logo, MPLAB, OptoLyzer, PIC, PICSTART, PIC32 logo, RightTouch, SpyNIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. The Embedded Control Solutions Company and mTouch are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet, KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, 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. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2015, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 978-1-63277-465-1 QUALITYMANAGEMENTSYSTEM CERTIFIEDBYDNV == ISO/TS16949== 2015 Microchip Technology Inc. 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. 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