MRF24J40MCT-I/RM Microchip Technology, MRF24J40MCT-I/RM Datasheet - Page 11

• Manufacturer Part Number: MRF24J40MCT-I/RM
• Description: 2.4 GHZ IEEE 802.15.4 POWERTRA 12 MODULE Varies T/R
• Manufacturer: Microchip Technology
• Series: -r

Specifications of MRF24J40MCT-I/RM

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: General Purpose
• Power - Output: 19dBm
• Sensitivity: -108dBm
• Voltage - Supply: 2.7 V ~ 3.6 V
• Current - Receiving: 25mA
• Current - Transmitting: 120mA
• Data Interface: PCB, Surface Mount
• Memory Size: -
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.0
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
Figure
Serial communications and register definitions for the
MRF24J40MC
“MRF24J40 Data Sheet” (DS39776). Refer to this
datasheet for specific serial interface protocol and
register definitions. Also, see
for specific register settings that are unique to the
MRF24J40MC module.
2.1
The MRF24J40MC module has a 50Ω ultra miniature
coaxial (U.FL) connector to connect to an external 2.4
GHz antenna.
The choice of antenna is limited to the antenna types
the module has been tested with. Refer to the
respective
FIGURE 2-1:
© 2011 Microchip Technology Inc.
Caution: The U.FL connector is fragile and can only
tolerate very limited number of insertions.
2-1.
CIRCUIT DESCRIPTION
External Antenna
application
country
module are documented in the
in
MRF24J40MC APPLICATION SCHEMATIC
schematic
Section 3.0
Section 1.3 “Operation”
is
illustrated
“Regulatory
Preliminary
in
Approval”
types that may be used with the MRF24J40MC
module.
2.2
A schematic diagram of the module is illustrated in
Figure 2-2
Table
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.
provide bias and decoupling.
2-1.
Module Schematic
and the Bill of Materials (BOM) is shown in
for a list of tested and approved antenna
The
MRF24J40MC
remaining
passive
DS75002A-page 11
components