Microchip MRF24WB0MB/RM 2.4 ghz, ieee std. 802.11bâ ¢ rf transceiver module Datasheet

MRF24WB0MA/MRF24WB0MB
Data Sheet
2.4 GHz, IEEE Std. 802.11b™
RF Transceiver Module
 2010 Microchip Technology Inc.
Preliminary
DS70632A
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ISBN: 978-1-60932-155-0
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DS70632A-page 2
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
MRF24WB0MA/MRF24WB0MB Data Sheet
2.4 GHz IEEE Std. 802.11b™
Features:
•
•
•
•
•
•
•
•
•
•
•
•
IEEE Std. 802.11-compliant RF Transceiver
Serialized unique MAC address
Data Rate: 1 and 2 Mbps
IEEE Std. 802.11b/g/n compatible
Small size: 21mm x 31mm 36-pin Surface Mount
Module
Integrated PCB antenna (MRF24WB0MA)
External antenna option (MRF24WB0MB) with
ultra miniature coaxial (U.FL) connector
Range: up to 400m (1300 ft.)
Easy integration into final product – accelerates
product development, provides quicker time to
market
Radio regulation certification for United States
(FCC), Canada (IC), Europe (ETSI) and Japan
(ARIB)
Wi-Fi® certified (WFA ID: WFA7150)
Designed for use with Microchip microcontroller
families (PIC18, PIC24, dsPIC33, and PIC32) with
downloadable Microchip TCP/IP Stack
Operational:
•
•
•
•
Single operating voltage: 2.7V-3.6V (3.3V typical)
Temperature Range: 0° C to +70° C Commercial
Simple, four-wire SPI interface with interrupt
Low-current consumption:
- RX mode – 85 mA (typical)
- TX mode – 154 mA (+10 dBm typical)
- Sleep – 250 µA (typical)
- Hibernate – <0.1 µA (typical)
RF/Analog Features:
• ISM Band 2.400-2.483.5 GHz operation
• 14 Channels selectable individually or domainrestricted
• DSSS Modulation
• Data Rate – 1000 kbps
• -91 dBm Typical sensitivity at 1 Mbps
• +10 dBm Typical output power with control
• Integrated low phase noise VCO, RF frequency
synthesizer, PLL loop filter and PA
• Digital VCO and filter calibration
 2010 Microchip Technology Inc.
• Integrated RSSI ADC and I/Q DACs, RSSI
readings available to host
• Balanced receiver and transmitter characteristics
for low power consumption
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, 802.1i security: WEP,
WPA-PSK, and WPA-2-PSK.
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 Healthcare
- Glucose Meters
- Fitness Equipment
- Patient Asset Tracking
Preliminary
DS70632A-page 3
MRF24WB0MA/MRF24WB0MB
Pin Diagram
Note:
Antenna connector on MRF24WB0MB only.
DS70632A-page 4
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
Table of Contents
1.0 Devices Overview......................................................................................................................................................................... 7
2.0 Circuit Description ...................................................................................................................................................................... 13
3.0 Regulatory Approval................................................................................................................................................................... 21
4.0 Electrical Characteristics ............................................................................................................................................................ 25
Appendix A: Revision History............................................................................................................................................................... 29
The Microchip Web Site ....................................................................................................................................................................... 31
Customer Change Notification Service ................................................................................................................................................ 31
Customer Support ................................................................................................................................................................................ 31
Reader Response ................................................................................................................................................................................ 32
Product Identification System .............................................................................................................................................................. 33
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 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 5
MRF24WB0MA/MRF24WB0MB
NOTES:
DS70632A-page 6
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
1.0
DEVICES OVERVIEW
The MRF24WB0MA/MRF24WB0MB modules have
received regulatory 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 transmitter). They also have Radio Type Approval
Certification for Japan. See Section 3.0 “Regulatory
Approval”, for the specific requirements that should be
adhered to by the integrator.
The MRF24WB0MA and MRF24WB0MB are lowpower, 2.4 GHz, IEEE Std. 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 integrated module design
frees the designer from RF and antenna design tasks
and regulatory compliance testing, ultimately providing
quicker time to market.
1.1
The MRF24WB0MA module is approved for use with
the integrated PCB meander antenna.
The block diagram in Figure 1-1 represents a
MRF24WB0MA/MRF24WB0MB module. It interfaces
to a Microchip PIC18, PIC24, dsPIC33, or PIC32 microcontrollers via 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. It also supports optional JTAG and serial
debug for testability. The debug port operates at 3.3v
and requires a level shifter for operation with RS-232
devices. Figure 1-2 shows a simplified example connection between a Microchip PIC MCU and the module. Table 1-1 lists the pin descriptions.
The MRF24WB0MB comes with an ultra miniature
coaxial connector (U.FL) and is approved for use with
a list of pre-certified antennas. See Section 2.8
“External Antenna”, for specific recommendations.
The MRF24WB0MA/MRF24WB0MB modules are
designed to be used with Microchip’s TCP/IP software
stack. The software 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 web site, http://www.microchip.com/wireless
Data communications with the MRF24WB0MA/
MRF24WB0MB are through the SPI interface that is
detailed in Section 2.0 “Circuit Description”. The
Microchip PIC microcontroller communicates with the
module via a command API from within the Microchip
TCP/IP stack. The command API is detailed in the
Microchip TCP/IP Stack online help that is included in
the free Microchip Application Libraries download.
The combination of the module and a PIC running the
TCP/IP stack results in support for IEEE Standard
802.11 and IP services. This allows, for example, the
immediate implementation of a wireless web server.
FIGURE 1-1:
Interface Description
MRF24WB0MA/MRF24WB0MB BLOCK DIAGRAM
MRF24WB0MA 2. 4 GHz IEEE Std. 802.11b RF Transceiver Module
FLASH
PCB
Antenna
(MRF24WB0MA)
Matching
Circuitry
SPI
AES, TKIP
Encryption
Accelerator
Interface
2.4 GHz
Transceiver
RAM
Digital I/O
Interrupt
Power
JTAG
Debug
Power
Amplifier
ROM
Reset
Hibernate
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 7
MRF24WB0MA/MRF24WB0MB
FIGURE 1-2:
MICROCONTROLLER TO MRF24WB0MA/MRF24WB0MB INTERFACE
MRF24WB0Mx
External
Antenna
(MRF24WB0MB)
PIC Microcontroller
CS
I/O
SDI
SDO
SDO
SDI
SCK
SCK
INT
INTx
+3.3V (Typ)
VDD
HIBERNATE
I/O
GND
GND
WP
I/O
RESET
I/O
DS70632A-page 8
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
TABLE 1-1:
Pin Description
Pin
Symbol
Type
Description
1
GND
P
2
NC
NC
3
JTAGTDO
O
4
JTAGTCK
I: Constant(1)
JTAG clock input
5
JTAGTMS
I
JTAG mode input
6
JTAGTDI
I
JTAG test data input
7
RESET
I: Constant(1)
Module Reset input
8
NC
NC
Ground
Do not connect
JTAG test data output
Do not connect
9
JTAGRST
I
JTAG Reset input (optional; see Section 2.0)
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)
I
Write protect (this pin is used to enable FLASH update)
17
VDD
P
Power
18
GND
P
Ground
19
GND
P
Ground
20
HIBERNATE
I
Hibernate mode enable (high input will disable the module)
21
JTAGEN
I
JTAG test enable
22
NC
NC
23
CS
I
24
NC
NC
25
GND
P
Ground
26
DEBUGRX
I
Serial debug port input (see Section 2.0)
27
DEBUGTX
O
Serial debug port output (see Section 2.0)
28
GND
P
Ground
29
VDD
P
Power
30
GND
P
Ground
31
NC
NC
32
SDO
O
SPI data out
33
INT
O
Interrupt output (open drain – requires a pull-up)
34
SCK
I
SPI clock input
Do not connect
SPI Chip Select input
Do not connect
Do not connect
35
SDI
I
SPI data in
36
GND
P
Ground
Legend: Pin type abbreviation: P = Power input, I = Input, O = Output, NC = Do Not Connect
Note 1:
2:
Signals of Type “I: Constant” must either be constantly driven by the host or have a pull-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.
WP is used as write-protect for the internal module SPI Flash. For production use, this pin should be
pulled low. For end application, this pin can be controlled by the host microcontroller to enable in field
Flash updates.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 9
MRF24WB0MA/MRF24WB0MB
1.2
Mounting Details
The MRF24WB0MA/MRF24WB0MB is a surface
mountable module. 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:
MRF24WB0MA/MRF24WB0MB MODULE PHYSICAL DIMENSIONS
Note:
DS70632A-page 10
Preliminary
Antenna connector on
MRF24WB0MB only.
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
Figure 1-4 shows the recommended host PCB footprint
for the module.
The MRF24WB0MA has an integrated PCB antenna.
For best performance, follow the mounting details
shown in Figure 1-4.
FIGURE 1-4:
For best performance, mount the module on the edge
of the host PCB with the antenna pattern facing
outward.
RECOMMENDED PCB FOOTPRINT
Note 1: The “Note 1” demarcation specifies the “Host PCB copper keep-out area”.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 11
MRF24WB0MA/MRF24WB0MB
Figure 1-5 illustrates the module reflow profile that is
recommended for mounting the device onto the host
PCB.
FIGURE 1-5:
RECOMMENDED MODULE REFLOW PROFILE AND SETPOINTS
1
2
3
4
5
Zones
6
7
8
300
Temperature (°C)
250
200
150
100
50
0
0
50
150
100
200
250
300
Time (Seconds)
TABLE 1-2:
MODULE REFLOW PROFILE(1)
Zone
Temperature (°C)
Note 1:
1
2
3
4
5
6
7
8
180°
180°
200°
200°
200°
220°
265°
270°
Conveyor Speed: 90 cm/min
DS70632A-page 12
Preliminary
 2010 Microchip Technology Inc.
 2010 Microchip Technology Inc.
2.0
CIRCUIT DESCRIPTION
The MRF24WB0MA/MRF24WB0MB 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:
MRF24WB0MA/MRF24WB0MB EXAMPLE APPLICATION SCHEMATIC
DS70632A-page 13
MRF24WB0MA/MRF24WB0MB
Preliminary
MRF24WB0MA/MRF24WB0MB
2.2
Power-On Sequence
The internal regulators for the digital and analog core
power supplies are enabled by driving the HIBERNATE
pin high. Figure 2-2 shows the waveforms for the core
supplies when powering up the MRF24WB0MA/
MRF24WB0MB with a nominal 3.3V applied to VDD.
FIGURE 2-2:
There is an internal Power-on-Reset (POR) detect
which starts the boot sequence from the internal ROM
when the core is powered. After approximately 300 ms
from when the VDD supply is within specification, the
MRF24WB0MA/MRF24WB0MB is ready for operation.
MRF24WB0MA/MRF24WB0MB POWER-ON SEQUENCE TIMING
Power On Ramp
(System Dependent)
MRF24WB0MA
Internal Boot
Ready for
Operation
VDD
2.7 V
Time
<5 ms
2.3
300 ms minimum
Power States
2.3.2
The MRF24WB0MA/MRF24WB0MB 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, as well
as overall power consumption or battery life. There is
also a “Standby” 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 via 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. This state provides the best battery life for embedded products. Note
that 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).
SLEEP STATE
The Sleep state is a low power dynamic state that automatically implements the 802.11 Power Save feature.
In this mode, if enabled, the module will enter power
save 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 days to several
weeks. This mode is characterized by a very low
latency (as low as 200 mS) to transfer data from the low
power state.
2.3.3
ACTIVE STATE
The Active state is identified as one of two states where
the radio circuitry is fully on. There is the Receive state
(RX ON) and the Transmit state (TX ON).
DS70632A-page 14
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
2.3.4
STANDBY STATE
The Standby 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:
State
MRF24WB0MA/MRF24WB0MB POWER STATE DEFINITIONS
VDD
CS
Description
Power is completely disconnected
Off
0V
0V
Hibernate
3.3V
3.3V
All internal power regulators are OFF – enabled by HIBERNATE pin
Sleep
3.3V
0V
Enabled by TCPIP driver
RX ON
3.3V
0V
Receive circuits are on and receiving
TX ON
3.3V
0V
Transmit circuits are on and transmitting
Standby
3.3V
0V
State machine transition state only – not user controlled
FIGURE 2-3:
MRF24WB0MA/MRF24WB0MB POWER-STATE DIAGRAM
10 us
Off
RX On
TX On
Note 1
200 us
Hibernate
Standby
Note 1
200 us
Sleep
Note 1: See Section 2.2.
2.4
JTAG Interface
Joint Test Action Group (JTAG) is the common name
used for the IEEE 1149.1 standard entitled Standard
Test Access Port and Boundary-Scan Architecture for
test access ports that are used for testing printed circuit
boards using boundary scan. The MRF24WB0MA/
MRF24WB0MB supports JTAG boundary scan. The
JTAG port provides the optional hardware JTAG Reset
input, JTAGRST. JTAG_EN and JTAGRST need to be
driven high to enable JTAG mode. JTAG should not be
enabled during normal functional operation. This function affects power state current.
 2010 Microchip Technology Inc.
2.5
Debug Serial Interface
The MRF24WB0MA/MRF24WB0MB incorporates a
Transmitted Data pin (DEBUGTX) and a Received Data
pin (DEBUGRX) for serial debugging purposes. These
pins can be connected to commercially available RS232 line drivers/receivers with appropriate external
level shifters. The serial interface is fully tested at
115200 bits/seconds with RS-232/UART interface
applications.
DS70632A-page 15
MRF24WB0MA/MRF24WB0MB
2.6
SPI Interface
2.7
PCB Antenna
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 low by the
MRF24WB0MA/MRF24WB0MB module. The INT line
is de-asserted high by the MRF24WB0MA/
MRF24WB0MB after the data is transferred to the host
PIC microcontroller. The SPI SCK speed can be up to
25 MHz.
The PCB antenna is fabricated on the top copper layer
and covered in solder mask. The layers below the
antenna have no copper trace.
The slave SPI interface implements the [CPOL=0;
CPHA=0] and [CPOL=0; CPHA=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.
The antenna patterns shown in the following plots, designated as Figure 2-4, Figure 2-5 and Figure 2-6, refer
to three separate axis of measurement that correspond
to the orientation of the module (drawn in the center of
each plot).
Data is placed on the bus with most significant bit
(MSb) first and least significant bit (LSb) last.
Figure 4-1 in Section 4.0 “Electrical Characteristics” shows the SPI timing diagram. Table 4-7 details
the SPI timing AC characteristics.
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.
The horizontal and vertical data, blue and red respectively, in each plot correspond to the orientation (polarization) of the measurement antenna rotated 360
degrees around the module.
The horizontal measurement was done with the receive
antenna parallel with the module PCB. The vertical
measurement was done perpendicular to the module
PCB.
These patterns allow the designer to understand the
performance of the module with respect to the position
of the receive/transmit antenna at the other end of the
link. Figure 2-4, Figure 2-5 and Figure 2-6 show the
simulated radiation patterns expected from the PCB
antenna.
DS70632A-page 16
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
FIGURE 2-4:
AZIMUTH RADIATION PATTERN, 2.44GHZ
0°
0 dB
-5 dB
Horizontal
-10 dB
-15 dB
Vertical
-20 dB
270°
90°
180°
 2010 Microchip Technology Inc.
DS70632A-page 17
MRF24WB0MA/MRF24WB0MB
FIGURE 2-5:
RADIATION PATTERN ON SIDE WITH PCB ANTENNA, 2.44GHZ
0°
0 dB
-5 dB
Horizontal
-10 dB
Vertical
-15 dB
-20 dB
270°
90°
180°
DS70632A-page 18
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
FIGURE 2-6:
RADIATION PATTERN ALONG PIN EDGE, 2.44GHZ
0°
0 dB
-5 dB
Horizontal
-10 dB
-15 dB
-20 dB
270°
90°
Vertical
180°
 2010 Microchip Technology Inc.
DS70632A-page 19
MRF24WB0MA/MRF24WB0MB
2.8
External Antenna
The MRF24WB0MB has been regulatory certified for
use with a number of antennas. The modular certifications hold only if the following antennas, or antennas
that are materially and functionally equivalent, are
used. All antennas connect to the module via an ultra
miniature coaxial (U.FL or IPEX) connector.
A list of antennas for use with the module is provided in
Table 2-2.
TABLE 2-2:
LIST OF CERTIFIED EXTERNAL ANTENNAS
Part Number
RFA-02-P05
Type
Gain (dBi)
VSWR
Max.
Connector
Vendor
PCB
2
2.0
IPEX
Aristotle
RFA-02-L6H1-70-35
Dipole
2
2.0
IPEX
Aristotle
RFA-02-D3
Dipole
1.5
2.0
IPEX
Aristotle
RFA-02-L2H1
Dipole
2
2.0
IPEX
Aristotle
RFA-02-3-C5H1
Dipole
3
2.0
IPEX
Aristotle
RFA-02-5-C7H1
Dipole
5
2.0
IPEX
Aristotle
RFA-02-5-F7H1
Dipole
5
2.0
IPEX
Aristotle
WF2400-15001A
Dipole
5
2.0
IPEX
Saytec
WF2400-15001AR
Dipole
5
2.0
RF-IPEX
Saytec
WF2400-10001I
Dipole
2
2.0
IPEX
Saytec
WF2400-10001R
Dipole
2
2.0
RF-IPEX
Saytec
AN2400-5901RS, used with connector
SMASFR8-3152H-00X00I
Omni
9
2.0
IPEX
Saytec
AN2400-5901RS, used with connector
SMASFR8-3152H-00X00IR
Omni
9
2.0
RF-IPEX
Saytec
DS70632A-page 20
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
3.0
REGULATORY APPROVAL
The MRF24WB0MA/MRF24WB0MB module has
received regulatory approvals for modular devices in
the United States, Canada and European countries.
Modular approval allows the end user to place the
MRF24WB0MA/MRF24WB0MB 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 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 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.
Refer to the specific country radio regulations for
details on regulatory compliance.
3.1
United States
The MRF24WB0MA/MRF24WB0MB has received
Federal Communications Commission (FCC) CFR47
Telecommunications, Part 15 Subpart C “Intentional
Radiators” 15.247 and modular approval in accordance
with FCC Public Notice DA 00-1407 Released: June
26, 2000, Part 15 Unlicensed Modular Transmitter
Approval. The MRF24WB0MA/MRF24WB0MB module
can be integrated into a finished product without obtaining subsequent and separate FCC approvals.
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:
• 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.
The MRF24WB0MA/MRF24WB0MB module has been
labeled with its own FCC ID number, and if the FCC ID
is not visible when the module is installed 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. The following
examples present terminology that could be used:
Contains Transmitter Module FCC ID: 
W7OZG2100-ZG2101
or
Contains FCC ID: W7OZG2100-ZG2101
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.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 21
MRF24WB0MA/MRF24WB0MB
3.1.1
3.2
RF EXPOSURE
Canada
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.
The MRF24WB0MA/MRF24WB0MB module has been
certified for use in Canada under Industry Canada (IC)
Radio Standards Specification (RSS) “RSS-210” and
“RSS-Gen”.
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.
a) The host device, as a stand-alone unit without
any separately certified modules, complies
with all applicable Radio Standards
Specifications.
b) The host device and all the separately certified
modules it contains jointly meet the RF exposure compliance requirements of “RSS-102”, if
applicable.
c) The host device complies with the certification
labeling requirements of each of the modules
it contains.”
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 distance 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 MRF24WB0MA/MRF24WB0MB 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
HELPFUL WEB SITES
Federal Communications Commission (FCC): 
http://www.fcc.gov
From “Section 7.1.1, RSS-Gen”, Issue 2, June 2007,
Modular Transmitter Approval:
“Host devices which contain separately certified
modules do not need to be recertified, provided
that they meet the following conditions:
The following
compliance.
example
demonstrates
labeling
NOTE: Compliance of a module in its final configuration is the responsibility of the applicant. A host
device will not be considered certified if the instructions regarding antenna configuration provided in
the original description, of one or more separately
certified modules it contains, were not followed.
From “Section 5.2, RSS-Gen”, Issue 2, June 2007,
Equipment Labels:
“All Category I radio equipment intended for use
in Canada shall permanently display on each
transmitter, receiver or inseparable combination
thereof, the applicant’s name (i.e., manufacturer’s
name, trade name or brand name), model number and certification number. This information
shall be affixed in such a manner as to not be
removable except by destruction or defacement.
The size of the lettering shall be legible without
the aid of magnification, but is not required to be
larger than 8-point font size. If the device is too
small to meet this condition, the information can
be included in the user manual upon agreement
with Industry Canada.”
The label is shown in the following example:
Contains IC: 8248A-G21ZEROG
DS70632A-page 22
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
From “Section 7.1.6, RSS-Gen”, Issue 2, June 2007,
Digital Circuits:
“If the device contains digital circuitry that is not
directly associated with the radio transmitter, the
device shall also have to comply with ICES-003,
Class A or B as appropriate, except for ICES-003
labeling requirements. The test data obtained (for
the ICES-003 tests) shall be kept by the manufacturer or importer whose name appears on the
equipment label, and made available to Industry
Canada on request, for as long as the model is
being marketed in Canada.”
3.2.1
Europe
Test standard ETSI EN 300 328 V1.7.1 (2006-10):
• Radiated Emissions
• Electro-Static Discharge
• Radiated RF Susceptibility
The modules are fully compliant with
Radiated Emissions EN 55022
Electrostatic Discharge EN 61000-4-2
Radiated Immunity EN 61000-4-3
EN 60950-1
CE-Mark
RoHS
ETSI does not provide a modular approval similar to
the USA (FCC) and Canada (IC). However, the testing
completed above can be used as part of the customer’s
application for certification. The test report data can be
included in their test plan and can significantly the
lower customer’s certification burden.
A helpful 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”,
downloadable
from
the
European
Radio
Communications Office (ERO): http://www.ero.dk
 2010 Microchip Technology Inc.
Radio and Telecommunications Terminal Equipment
(R&TTE):
http://ec.europa.eu/enterprise/rtte/index_en.htm
European
Conference
of
Postal
Telecommunications Administrations (CEPT):
http://www.cept.org/
and
3.4
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.
Maximum Transmit Power
Maximum EIRP Spectral Density
Frequency Range
Radiated Emissions
Test standards ETSI EN 301 489-1:2008 and ETSI EN
301 489-17:2008:
•
•
•
•
•
•
HELPFUL WEB SITES:
European Radio Communications Office (ERO): 
http://www.ero.dk/
The MRF24WB0MA/MRF24WB0MB module has been
certified for use in European countries. The following
testing has been completed:
•
•
•
•
3.3.1
European Telecommunications Standards Institute
(ETSI): 
http://www.etsi.org/
HELPFUL WEB SITES:
Industry Canada: 
http://www.ic.gc.ca/
3.3
The end user is responsible for ensuring compliance
with harmonized frequencies and labeling requirements for each country in which the end device is
marketed and sold.
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, e.g., 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
MRF24WB0MA and MRF24WB0MB modules are in
the ASD category.
The modules are certified under Wi-Fi 802.11 with
WPA2, WPA, and WEP System Interoperability ASD
Model Test Plan with Test Engine For IEEE 802.11a, b,
and g Devices (Version 1.0).
Preliminary
DS70632A-page 23
MRF24WB0MA/MRF24WB0MB
Per the Wi-Fi Alliance approved ASD test plan, the definition of the Microchip MRF24WB0MA and
MRF24WB0MB modular solutions is expressed in the
following statements:
“Member Wireless solution is a single-chip
802.11b module including MAC, baseband, RF
and power amplifier personal STA. It utilizes a
simple to use API for embedded markets, and an
OS is not a requirement for operation. It supports
1 and 2 Mbps (TX and RX). It also supports WEP,
WPA Personal, and WPA2 Personal security.
Ciphers supported are AES and TKIP. The Member Wireless solution interfaces with the HOST
through SPI Bus. Some applications for the Member Wireless solution are as following:
• Sensors/Controls such as Industrial & Factory
sensors, HVAC, & Lighting
• Consumer Electronic such as remote controls,
toys, and internet radio
This certification ensures that the MRF24WB0MA
and MRF24WB0MB modules have passed rigorous testing for interoperability across existing
consumer and business Wi-Fi equipments, and
their certifications are completed (WFA ID:
WFA7150). The certification effort undertaken will
save customers time and money. For modular
policy, please refer to WFA Module Policy (Version 2.2; MARCH 2006).”
DS70632A-page 24
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
4.0
ELECTRICAL
CHARACTERISTICS
TABLE 4-1:
DIGITAL ELECTRICAL CHARACTERISTICS (NOMINAL CONDITIONS: 25C,
VDD = 3.3V)
Parameters
Min
VIL (Input low voltage)
VIH (Input high voltage)
Typ
Max
Units
-0.3
0.8
V
2
5.5
V
0.4
V
VOL (Output low voltage)
VOH (Output high voltage)
2.4
V
IOL (Output low level current at VOL Max)
8.5
mA
IOH (Output high level current at VOH Min)
15.4
mA
TABLE 4-2:
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Min
Max
Storage Temperature
-40C
+125C
VDD
0V
Notes
4.2V for 0.5mSec VDD above this level and duration will disable Radio
VIN on SDI, CS, SCK
-0.3V
5.5V
Note 1: Listed Absolute Maximum Ratings are not meant for functional operation. Operation at these levels is not
guaranteed, and may reduce the operating life of the component.
TABLE 4-3:
RECOMMENDED OPERATING CONDITIONS
Parameters
Max
Units
0
+70
Degrees Celsius
VDD – for FCC and IC
2.70
3.3
3.63(2)
Volts
VDD – for ETSI(1)
2.80
3.3
3.63(2)
Volts
Ambient Temperature
Min
Japan(1)
Typ
3.63(2)
VDD – for
2.97
3.3
Volts
Note 1: Operation in EU and/or Japan over extended voltage range of 2.7V to 3.6V will require additional
certification testing by customer. The module is capable of this operation.
2: While 3.63V is the maximum operating voltage, the module will detect an overvoltage condition at 4.2V and
disable the RF Transmit function in 0.5 ms. This is an RF certification behavior pertaining to disabling
transmission in unforeseen overvoltage conditions.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 25
MRF24WB0MA/MRF24WB0MB
TABLE 4-4:
CURRENT CONSUMPTION(3) (NOMINAL CONDITIONS: 25C, VDD = 3.3V)
Parameters
Min
IDD, Hibernate = 3.3V
Typ
Max
0.1
IDD, Sleep (software enabled)
250
Units
µA
(1)
µA
IDD, Standby (transitional state)
10
mA
IDD core(2), RX on, Receive @-83dBm with 2Mbps
modulated signal at antenna port
85
mA
IDD core, TX on, +0 dBm
115
mA
IDD core, TX on, +10 dBm
154
mA
Note 1: Sleep current is current consumed during periods of “standby” 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 for it).
2: IDD core is current consumed by the part not including the I/O consumption of the SPI port.
3: 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.
TABLE 4-5:
RECEIVER AC CHARACTERISTICS(1)
Parameters
Min
Flo
2412
Typ
Max
Units
2484
MHz
RX Min Input Level Sensitivity, 1Mbps, 8% PER
-91
dBm
RX Min Input Level Sensitivity, 2Mbps, 8% PER
-88
dBm
RX Max Input Level (Power), 1Mbps, 8% PER
-4
dBm
RX Max Input Level (Power), 2Mbps, 8% PER
-4
Note 1: Nominal conditions: 25C, VDD = 3.3V, Flo = 2437 MHz, measurements at antenna port.
TABLE 4-6:
dBm
TRANSMITTER AC CHARACTERISTICS(1)
Parameters
Min
Flo
2412
Typ
Max
Units
2484
MHz
Average Pout (transmit spectrum mask compliant)
+10
dBm
Average Pout gain step resolution from +5 to +10dBm
0.5
dB
Average Pout gain step resolution from -5 to +5dbm
1.0
dB
Average Pout settled variation
-0.5
0.5
dB
Note 1: Nominal conditions: 25C, VDD = 3.3V, Flo = 2437 MHz, 2 Mbps. modulated signal measured at antenna
port.
DS70632A-page 26
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
FIGURE 4-1:
SPI INPUT TIMING
TCSD
TSCK
CS
TCSH
TCSS
SCK
TSU
SI
THD
MSb In
LSb In
High-Impedance
SO
FIGURE 4-2:
SPI OUTPUT TIMING
CS
TSCK
SCK
TV
SO
TV
TDIS
MSb Out
LSb Out
Don’t Care
SI
LSb In
TABLE 4-7:
SPI INTERFACE AC CHARACTERISTICS
Symbol
Parameters
Min
TSCK
SCK Period
40
nS
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
 2010 Microchip Technology Inc.
Max
15
Preliminary
Units
nS
DS70632A-page 27
MRF24WB0MA/MRF24WB0MB
NOTES:
DS70632A-page 28
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
APPENDIX A:
REVISION HISTORY
Revision A (April 2010)
Initial release of this document.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 29
MRF24WB0MA/MRF24WB0MB
NOTES:
DS70632A-page 30
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
THE MICROCHIP WEB SITE
CUSTOMER SUPPORT
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:
Users of Microchip products can receive assistance
through several channels:
• 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 (FAQ), 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 seminars and events, listings of Microchip sales offices, distributors and factory representatives
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
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://support.microchip.com
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 
http://www.microchip.com, click on Customer Change
Notification and follow the registration instructions.
 2010 Microchip Technology Inc.
Preliminary
DS70632A-page 31
MRF24WB0MA/MRF24WB0MB
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 organization, 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.
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FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Device: MRF24WB0MA/
Y
N
Literature Number: DS70632A
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?
DS70632A-page 32
Preliminary
 2010 Microchip Technology Inc.
MRF24WB0MA/MRF24WB0MB
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
M
X
T
-X
Device
Module
Module
Type
Tape and
Reel
Temperature
Range
Device
MR24WB0MA/MRF24WB0MB;
VDD range 2.7V to 3.6V
Temperature Range
C
=
0C to
 2010 Microchip Technology Inc.
+70C
Examples:
a)
b)
MRF24WB0MA/RM = Commercial temp. tray
MRF24WB0MB/RM = Commercial temp. tray
(Commercial)
Preliminary
DS70632A-page 33
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
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
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
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
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Tel: 81-45-471- 6166
Fax: 81-45-471-6122
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Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
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
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Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
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Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
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Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
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Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-6578-300
Fax: 886-3-6578-370
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
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
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/05/10
DS70632A-page 34
Preliminary
 2010 Microchip Technology Inc.
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