CC2520_11 Datasheet, PDF (26/133 Pages) Texas Instruments – 2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER

CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
8.3 Block Diagram
SO
SI
CSn
SPI
Instruction
decoder
GPIO5
GPIO4
GPIO3
GPIO2
Exception
controller
IO
Vreg
Frame
filtering and
source
matching
AES
DPU
Clock/
reset
BIAS
FSM
Synthesizer
Demod
Modulator
RF_core
ADI ADI
RAM
AAF
PS
LPF
RX MIX
FS
TX MIX
PA
LNA
XOSC
REF
DIV
RF_N
RF_P
Figure 2: CC2520 block diagram
CC2520 is typically controlled by a microcontroller connected to the SPI and some GPIOs. The
microcontroller will send instructions to CC2520 and it is the responsibility of the instruction decoder to
execute the instructions or pass them on to other modules.
The execution of an instruction or external events (e.g. reception of a frame) may result in one or more
exceptions. The exceptions provide a very flexible mechanism for automating tasks. They can for instance
be used to trigger execution of other instructions or they can be routed out to GPIO pins and used as
interrupt signals to the microcontroller. The exception controller is responsible for handling of the
exceptions.
26
WWW.TI.COM