CC2420 Chipcon AS, CC2420 Datasheet - Page 21
![no-image](/images/no-image-200.jpg)
CC2420
Manufacturer Part Number
CC2420
Description
2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
Manufacturer
Chipcon AS
Datasheet
1.CC2420.pdf
(85 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CC2420-RTR1
Manufacturer:
COOPER/Bussmann
Quantity:
25 000
Company:
Part Number:
CC2420RGZR
Manufacturer:
TI/CC
Quantity:
9 035
Part Number:
CC2420RGZR
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
CC2420RGZT
Manufacturer:
TI/德州仪器
Quantity:
20 000
Company:
Part Number:
CC2420RTCR
Manufacturer:
TI/CC
Quantity:
18 300
Part Number:
CC2420RTCR
Manufacturer:
TI-CHIPCON
Quantity:
20 000
Company:
Part Number:
CC2420ZRTCR
Manufacturer:
TI-CHIPCON
Quantity:
12 300
IEEE 802.15.4 Modulation Format
This section is meant as an introduction to
the 2.4 GHz direct sequence spread
spectrum (DSSS) RF modulation format
defined in IEEE 802.15.4. For a complete
description, please refer to [1].
The modulation and spreading functions
are illustrated at block level in Figure 5 [1].
Each byte is divided into two symbols, 4
bits each. The least significant symbol is
transmitted first. For multi-byte fields, the
The
Quadrature Phase Shift Keying (O-QPSK)
with half-sine chip shaping. This is
equivalent to MSK modulation. Each chip
Chipcon AS SmartRF® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
modulation
Symbol
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Transmitted
bit-stream
(LSB first)
format
Table 3. IEEE 802.15.4 symbol-to-chip mapping [1]
Figure 5. Modulation and spreading functions [1]
Chip sequence (C
1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0
1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0
0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0
0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1
0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1
0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0
1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1
1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1
1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1
1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1
0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1
0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0
0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0
0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1
1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0
1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0
Symbol
Bit-to-
is
Offset
0
, C
–
1
, C
Symbol-
to-Chip
2
, … , C
SmartRF
least significant byte is transmitted first,
except for security related fields where the
most significant byte it transmitted first.
Each symbol is mapped to one out of 16
pseudo-random
each. The chip to symbol mapping is
shown in Table 3. The chip sequence is
then transmitted at 2 MChips/s, with the
least significant chip (C
for each symbol.
is shaped as a half-sine, transmitted
alternately in the I and Q channels with
one half chip period offset. This is
illustrated for the zero-symbol in Figure 6.
31
)
Modulator
O-QPSK
sequences,
®
Modulated
Signal
CC2420
0
) transmitted first
Page 21 of 85
32
chips