
33
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
The ATmega2564/1284/644RFR2 features a low-power 2.4 GHz radio transceiver
designed for industrial and consumer ZigBee/IEEE 802.15.4, 6LoWPAN, RF4CE and
high data rate 2.4 GHz ISM band applications. The radio transceiver is a true peripheral
block of the AVR microcontroller. All RF-critical components except the antenna, crystal
and
de-coupling
capacitors
are
integrated
on-chip.
Therefore,
the
ATmega2564/1284/644RFR2 is particularly suitable for applications like:
2.4 GHz IEEE 802.15.4 and ZigBee systems
6LoWPAN and RF4CE systems
Wireless sensor networks
Industrial control, sensing and automation (SP100, WirelessHART)
Residential and commercial automation
Health care
Consumer electronics
PC peripherals
9.2 General Circuit Description
This radio transceiver is part of a system-on-chip solution with an AVR
microcontroller.
It comprises a complex peripheral component containing the analog radio, digital
modulation and demodulation including time and frequency synchronization and data
buffering. The number of external components for the transceiver operation is
minimized such that only the antenna, the crystal and decoupling capacitors are
required. The bidirectional differential antenna pins (RFP, RFN) are used for
transmission and reception, thus no external antenna switch is needed.
The transceiver block diagram of the ATmega2564/1284/644RFR2 is shown in
FigureFigure 9-9. Transceiver Block Diagram
AVREG
LNA
PLL
PA
PPF
BPF
Limiter
RX
ADC
AGC
ext. PA and Power
Control
Configuration Registers
C
Interface
RSSI
Data
Interrupts
Address
Control
DIG3/4
RFP
RFN
TX Data
Control Logic
Antenna Diversity
FTN, BATMON
XOSC
X
T
A
L
1
X
T
A
L
2
Analog Domain
Digital Domain
AES
DIG1/2
AD
RX BBP
Frame
Buffer
TX BBP
DVREG