MRF24J40_08 Datasheet, PDF (5/152 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
1.0 OVERVIEW
The MRF24J40 is an IEEE 802.15.4™ Standard com-
pliant 2.4 GHz RF transceiver. It integrates the PHY
and MAC functionality in a single chip solution.
Figure 1-1 shows a simplified block diagram of a
MRF24J40 wireless node. The MRF24J40 creates a
low-cost, low-power, low data rate (250 or 625 kbps)
Wireless Personal Area Network (WPAN) device. The
MRF24J40 interfaces to many popular Microchip PIC^®
microcontrollers via a 4-wire serial SPI interface,
interrupt, wake and Reset.
The MRF24J40 provides hardware support for:
• Energy Detection
• Carrier Sense
• Three CCA Modes
• CSMA-CA Algorithm
• Automatic Packet Retransmission
• Automatic Acknowledgment
• Independent Transmit, Beacon and GTS FIFO
Buffers
• Security Engine supports Encryption and
Decryption for MAC Sublayer and Upper Layer
These features reduce the processing load, allowing
the use of low-cost 8-bit microcontrollers.
The MRF24J40 is compatible with Microchip's
ZigBee^®, MiWi™ and MiWi P2P software stacks. Each
software stack is available as a free download, includ-
ing source code, from the Microchip web site:
http://www.microchip.com/wireless.
FIGURE 1-1:
WIRELESS NODE BLOCK DIAGRAM
Antenna
Matching
Circuitry
MRF24J40
RFP
RFN
PHY
MAC
Power
Management
Memory
CS
SDI
SDO
SCK
INT
WAKE
RESET
PIC^® MCU
I/O
SDO
SDI
SCK
INTx
I/O
I/O
20 MHz
Crystal
© 2008 Microchip Technology Inc.
Preliminary
DS39776B-page 3