MRF24J40 Silicon Errata Datasheet by Microchip Technology

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MICROCHIP M RF24J 40 Work around Work around Date Codes that pertain to this issue Date Codes that pertain to m Issue Work around Date Codes that genain to this issue
2015-2019 Microchip Technology Inc. DS80000299F-page 1
MRF24J40
The MRF24J40 RF transceiver you have received con-
forms functionally to the Device Data Sheet
(DS30009776C), except for the anomalies described in
this document.
1. Module: RX MAC
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.
Work around
When operating in Promiscuous mode, flush the
RX buffer by setting the RXFLUSH bit
(RXFLUSH<0>) after every RX interrupt.
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 decryp-
tion 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 check-
ing 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.
3. Module: RX MAC
Under certain conditions, such as channel scan-
ning, 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.
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
To prevent this system degradation, do one of the
following:
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 success-
ful 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 inter-
mittent, 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.
MRF24J40 Silicon Errata
Work around Work around RESET RESET RESET Program 9 Channel lnlormation RESET Work around
2015-2019 Microchip Technology Inc. DS80000299F-page 2
MRF24J40
Work around
Please ensure that the Initialization settings for
MRF24J40 are used as described in section 3.2 of
the MRF24J40 Data Sheet (DS30009776C). Spe-
cifically, 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 imple-
mented 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 speci-
fied period, the host MCU can reprogram the
channel information to resume packet
reception.
In the customer main application while loop,
continuously reprogram the channel informa-
tion.
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 Sec-
tion 3.4 of the MRF24J40 Data Sheet.
Applications using MiWi™ Stack can call the
MiApp function to perform the programming chan-
nel information:
MiApp_SetChannel(uint8_t channelNum)
Date Codes that pertain to this issue
Issue appears in modules with MRF24J40 date
codes from the year 2013 to present.
5. Module: RX MAC SLEEP
Transmission and reception of packets may not be
successful under certain conditions, if the WAKE
pin on the device is used to wake up the device
from sleep.
For example: performing a sleep —> Wake-up
(using the WAKE pin) —> Transmission of Packet
on MRF24J40.
Work around
The following is the work around for such
scenarios:
1. Perform an external hardware reset, by
asserting the RESET pin 13 low. The
MRF24J40 will be released from reset approx-
imately 250 us after the RESET pin is
released.
2. Perform a Software Reset on MRF24J40,
SOFTRST (0x2A) = 0x07.
3. Re-initialize the RF configuration in the
Application.
Applications using MiWi Stack can call the MiApp
function to perform the preceding work around by
enabling a macro, which enables the wake up of
MRF24J40 using RESET pin 13.
In the “bool MiMAC_PowerState(uint8_t Power-
State)” function, modify the case
POWER_STATE_OPERATE to disable wake up
from WAKE pin and enable the wake up from the
RESET pin.
6. Module: Operating Voltage
Device may not reliably operate at operating volt-
age <3.0V across the entire operating temperature
range (-40 to +85 °C).
Work around
Operating voltage must be 3.0V for reliable
operation. Minimum operating voltage of the
device is revised to 3.0V.
2015-2019 Microchip Technology Inc. DS80000299F-page 3
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).
Rev E Document (5/2019)
Added silicon issue 5 (RX MAC)
Rev F Document (8/2019)
Added silicon issue 6 (Operating Voltage)
Updated referenced data sheet DS number
2019 Microchip Technology Inc. DS80000299F-page 4
MRF24J40
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© 2019, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-4927-0
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