CC2420 Chipcon AS, CC2420 Datasheet - Page 56

• Manufacturer Part Number: CC2420
• Description: 2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
• Manufacturer: Chipcon AS

CC2420
even with a low-cost 8 bit controller.
Low cost systems
As the
channel performance without any external
filters, a very low cost system can be
made.
A differential antenna will eliminate the
need for a balun, and the DC biasing can
be achieved in the antenna topology.
Battery operated systems
In low power applications, the
should be powered down when not being
active. Extremely low power consumption
may be achieved when disabling also the
voltage
reprogramming of the register and RAM
configuration.
BER / PER measurements
CC2420
received infinitely and output to pins
(RX_MODE 2, see page 35). This mode
may be used for Bit Error Rate (BER)
measurements. However, the following
actions must be taken to do such a
measurement:
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
•
•
includes test modes where data is
A preamble and SFD sequence
must be used, even if pseudo
random data is transmitted, since
receiving the DSSS modulated
signal
synchronisation,
synchronisation like e.g. in 2FSK
systems. The SYNCWORD may be
set to another value to fit to the
measurement setup if necessary.
The data transmitted over air must
be spread according to [1] and the
description on page 21. This
means that the transmitter used
during measurements must be
able to do spreading of the bit
data to chip data. Remember that
the chip sequence transmitted by
the test setup is not the same as
the bit sequence which is output
by
CC2420
enables a high level of security
regulator.
CC2420
provides 250 kbps multi-
.
requires
This
will
not
symbol
CC2420
require
bit
SmartRF
In
communication is based on packets. The
sensitivity limit specified by [1] is based on
Packet Error Rate (PER) measurements
instead of BER. This is a more accurate
measurement of the true RF performance
since it mirrors the way the actual system
operates.
Chipcon recommends performing PER
measurements
measurements
performance of IEEE 802.15.4 systems.
To do PER measurements, the following
may be used as a guideline:
•
•
•
•
•
•
an
When operating at or below the
sensitivity limit,
symbol synchronisation in infinite
receive mode. A new SFD and
restart of the receiver may be
required
synchronisation.
A valid preamble, SFD and length
field must be used for each
packet.
The PSDU (see Figure 15 on
page 32) length should be 20
bytes for sensitivity measurements
as specified by [1].
The sensitivity limit specified by [1]
is the RF level resulting in a 1%
PER. The packet sample space
for a given measurement must
then be >> 100 to have a
sufficiently large sample space.
E.g. at least 1000 packets should
be
sensitivity.
The data transmitted over air must
be spread according to [1] and the
description on page 21. Pre-
generated packets may be used,
although [1] requires that the PER
is averaged over random PSDU
data.
The
used to buffer data received
during PER measurements, since
it is able to buffer up to 128 bytes.
IEEE
CC2420
used
802.15.4
®
instead
to
receive FIFO may be
to
CC2420
CC2420
to
evaluate
measure
system,
of
Page 56 of 85
may lose
re-gain
BER
the
the
all