MRF24WB0MA/MRF24WB0MB RF Transceiver Module Errata and Data Sheet Clarification

MRF24WB0MA/MRF24WB0MB
MRF24WB0MA/MRF24WB0MB RF Transceiver Module
Errata and Data Sheet Clarification
The MRF24WB0MA/MRF24WB0MB RF Transceiver
Module that you have received conform functionally to
the current Device Data Sheet (DS70632B), except for
the anomalies described in this document.
A detailed description and possible work around for
each of the issues are available on page 2, following
the Table 1 Module Issue Summary.
Data Sheet clarifications and corrections are available
on page 3, following the discussion of product issues.
The product revision level can be identified by locating
the seven digit manufacturing date code located on the
module.
Note:
For more information on extracting the
product date code, refer to the product
Data Sheet or contact your local Microchip
sales office.
TABLE 1:
MODULE ISSUE SUMMARY
Item
Number
Affected Date Code
Issue Summary
<1039XXX
≥1039XXX
>1108XXX
1.
Power Save (PS) bit is set
incorrectly in the PS-Poll
frame.
X
2.
If the WPA or WPA2 keys
are incorrectly entered, the
host code will hang waiting
to connect.
X
X
3.
Large Beacon frames
X
X
4.
TX Buffer not available
X
X
X
5.
High Traffic Loss
Connection handling
of
X
X
X
6.
High Traffic Probe request
X
X
X
TABLE 2:
>1222XXX
X
DATE CODE FIRMWARE VERSION
Version
Date Code
1201
< 1013, some 1014, 1015
1204
> 1016
1205
>= 1039
1207
> 1108
120C
> 1222
 2010-2012 Microchip Technology Inc.
DS80516C-page 1
MRF24WB0MA/MRF24WB0MB
Module Errata Issues
4. Module: TX Buffer Not Available
1. Incorrect PS bit handling
The Power Save (PS) bit is set incorrectly in the
PS-Poll frame when the module comes out of
Power Save (PS) mode. This causes some
routers to revert the module back to PS mode
disabling any data transfer.
Work around
This does not affect all routers; hence, there is no
work around for those that respond to the PS bit
within a PS-Poll frame.
Affected Silicon Revisions
<1039XXX
There is a rare corner case when the module TX
Buffer is not available to handle any further host
management requests and will always return
False to the MACIsTXReady() request causing a
deadlock condition.
Work around
A watchdog timer must be used to detect the
condition and reset the module when the event
occurs.
Affected Silicon Revisions
<1039XXX ≥1039XXX >1108XXX >1222XXX
X
≥1039XXX
X
X
5. Module: High Traffic Loss of Connection
Handling
X
2. Incorrect WPA error handling
When the WPA or WPA2 keys are incorrectly
entered, the module firmware asserts causing the
host code to hang in a state waiting to connect to
the module.
Work around
Detect a time-out condition when trying to connect
through WPA or WPA2 and have the host code
restart or send a failure message to the user.
Affected Silicon Revisions
≥1039XXX
X
X
>1108XXX
Some (older) 1108xxx date code parts do not have
the fix.
3. Module: Large Beacon Frames
Some new platforms such as the iPhone 4 and
some 802.11n routers send beacon frames larger
than 128 bytes which can causes abnormal
behavior and possible system failure.
Work around
None. Must update to 120A or greater.
<1039XXX ≥1039XXX >1108XXX >1222XXX
DS80516C-page 2
Do not use host scan or use watchdog timer to
detect the condition and reset the module when
the event occurs.
Affected Silicon Revisions
X
X
X
6. Module: High Traffic Probe Request
When trying to establish a connection or
reconnecting (automatic) in an extremely high
traffic environment, the module may not get an
opportunity to send a probe request which may
cause the system to hang.
Work around
A watchdog timer must be used to detect the
condition and reset the module when the event
occurs.
Affected Silicon Revisions
Affected Silicon Revisions
X
Work around
<1039XXX ≥1039XXX >1108XXX >1222XXX
<1039XXX
X
When the module is connected to an AP and host
initiates a scan, if the module cannot hear the AP,
or the AP turns off, the module does not notify the
host of the lost connection.
X
<1039XXX ≥1039XXX >1108XXX >1222XXX
X
X
X
 2010-2012 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
Data Sheet Clarifications
The following typographic corrections and clarifications
are to be noted for the latest version of the Device Data
Sheet (DS70632B).
1.
2.
3.
Operating temperature of part has been
increased to -20°C to +85°C.
SPI mode 3 is CPOL=CPHA=1
Debug serial interface operates at 19200, 8, N,
1, N
 2010-2012 Microchip Technology Inc.
DS80516C-page 3
MRF24WB0MA/MRF24WB0MB
APPENDIX A:
REVISION HISTORY
Revision A Document (December 2010)
This is the Initial release of the document.
Issue 1 – Incorrect PS bit handling
Issue 2 – Incorrect WPA error handling
Revision B Document (May 2011)
1.
2.
3.
Updated Table 1: Removed “Feature” column
and added new column for Data Code.
Updated Issue 1. Incorrect PS bit handling:
Changed Affected Product Date Codes to Affected
Silicon Revisions.
Updated Issue 2. Incorrect WPA error handling:
Changed Affected Product Date Codes to Affected
Silicon Revisions, and added new data code.
Revision C Document (September 2012)
Added silicon issues 3 (Large Beacon Frames), 4 (TX
Buffer Not Available), 5 (High Traffic Loss of Connection Handling), and 6 (High Traffic Probe Request).
Added the “>1222XXX” Affected Date Code column
in Table 1.
Added Table 2.
DS80516C-page 4
 2010-2012 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
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•
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•
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DS80516C-page 5
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