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PDF MRF24J40MC Data sheet ( Hoja de datos )
| Número de pieza | MRF24J40MC | |
| Descripción | RF Transceiver Module | |
| Fabricantes | Microchip Technology | |
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MRF24J40MC
Data Sheet
2.4 GHz IEEE Std. 802.15.4™ RF
Transceiver Module with PA/LNA and
External Antenna Connector
© 2011 Microchip Technology Inc.
Preliminary
DS75002A
1 page  
MRF24J40MC
1.0 DEVICE OVERVIEW
The MRF24J40MC is a 2.4 GHz IEEE Std. 802.15.4™
compliant, surface mount module with integrated
crystal, internal voltage regulator, matching circuitry,
Power Amplifier (PA), Low Noise Amplifier (LNA) with
50Ω external antenna connector. The MRF24J40MC
module operates in the non-licensed 2.4 GHz
frequency band. The integrated module design frees
the integrator from extensive RF and antenna design,
and regulatory compliance testing allowing quicker
time to market.
The MRF24J40MC module is compatible with
Microchip’s ZigBee®, and MiWi™ Development
Environment software stacks. The MiWi Development
Environment software stack including the source code
is available as a free download, from the Microchip web
site: http://www.microchip.com/wireless.
The MRF24J40MC module has received regulatory
approvals for modular devices in the United States
(FCC) and Canada (IC). Modular approval removes the
need for expensive RF and antenna design, and allows
the end user to place the MRF24J40MC module inside
a finished product and does not require regulatory
testing for an intentional radiator (RF transmitter). To
maintain conformance, refer to module settings in
Section 3.1.1 “MRF24J40MC Settings” for the
United States and Section 3.2.1 “MRF24J40MC
Settings” for Canada.
The MRF24J40MC module has been tested and
conforms to ETS EN 300 328 V1.7.1 (2006-10)
European Standards. The module tests can be applied
toward final product certification and Declaration of
Conformity (DoC). To maintain conformance for
Europe, refer to module settings in Section 3.3.1
“MRF24J40MC Settings”. Additional testing may be
required depending on the end application.
1.1 Interface Description
Figure 1-1 shows a simplified block diagram of the
MRF24J40MC module. The module is based on the
Microchip Technology MRF24J40 IEEE 802.15.4™
2.4 GHz RF Transceiver IC. The module interfaces to
many popular Microchip PIC® microcontrollers
through a 4-wire SPI interface, interrupt, wake, reset,
power and ground, as shown in Figure 1-2. Table 1-1
provides the pin descriptions.
Serial communication and module configuration for the
MRF24J40MC module are documented in the
“MRF24J40 Data Sheet” (DS39776). Refer to the
datasheet for specific serial interface protocol and
register definitions.
Also, see Section 1.3 “Operation” for specific register
settings that are unique to the MRF24J40MC module.
FIGURE 1-1:
PIC18FXXXX BLOCK DIAGRAM
Antenna
U.FL
Connector
PIC18FXXXX IEEE Std. 802.15.4™ Module
MRF24J40
PA Interface
Physical
MAC
Power
LNA Management
SPI
Digital
I/O
Power
20 MHz
Crystal
© 2011 Microchip Technology Inc.
Preliminary
DS75002A-page 5
5 Page 
MRF24J40MC
2.0 CIRCUIT DESCRIPTION
The MRF24J40MC is a 2.4 GHz IEEE Std. 802.15.4™
compliant surface mount module with integrated crystal,
internal voltage regulator, matching circuitry, power
amplifier, low noise amplifier with 50Ω external antenna
connector.
The MRF24J40MC module interfaces to many popular
Microchip PIC microcontrollers through a 4-wire SPI
Interface, interrupt, wake, reset, power and ground. An
example application schematic is illustrated in
Figure 2-1.
Serial communications and register definitions for the
MRF24J40MC module are documented in the
“MRF24J40 Data Sheet” (DS39776). Refer to this
datasheet for specific serial interface protocol and
register definitions. Also, see Section 1.3 “Operation”
for specific register settings that are unique to the
MRF24J40MC module.
2.1 External Antenna
The MRF24J40MC module has a 50Ω ultra miniature
coaxial (U.FL) connector to connect to an external 2.4
GHz antenna.
Caution: The U.FL connector is fragile and can only
tolerate very limited number of insertions.
The choice of antenna is limited to the antenna types
the module has been tested with. Refer to the
respective country in Section 3.0 “Regulatory
Approval” for a list of tested and approved antenna
types that may be used with the MRF24J40MC
module.
2.2 Module Schematic
A schematic diagram of the module is illustrated in
Figure 2-2 and the Bill of Materials (BOM) is shown in
Table 2-1.
The MRF24J40MC module is based on the Microchip
Technology MRF24J40 IEEE 802.15.4™ 2.4 GHz RF
Transceiver IC (U6). The Serial I/O (SCK, SDI, SDO
and CS), RESET, WAKE and INT pins are brought out
to the module pins. The SDO signal is tri-state buffered
by U7 to solve a silicon errata, where the SDO signal
does not release to a high-impedance state, after the
CS pin returns to its inactive state.
Crystal, X1, is a 20 MHz crystal with a frequency
tolerance of ±10 ppm @ 25°C to meet the IEEE Std.
802.15.4 symbol rate tolerance of ±40 ppm.
A balun is formed by components: L11, L12, L13, C25,
C27 and C31. L12 is also a pull-up for the RFP and
RFN pins on the MRF24J40. C25 also acts as a DC
block capacitor. RF switches, U1 and U2, switch
between the power amplifier, U3, when transmitting
and low noise amplifier, U2, when receiving. A
band-pass filter FL1 is placed after the PA U3 to reduce
harmonics. The remaining passive components
provide bias and decoupling.
FIGURE 2-1:
MRF24J40MC APPLICATION SCHEMATIC
© 2011 Microchip Technology Inc.
Preliminary
DS75002A-page 11
11 Page | ||
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| PDF Descargar | [ Datasheet MRF24J40MC.PDF ] | |
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