SmartRF
CC2420
CC2420
2.4 GHz IEEE 802.15.4 / Zigbee RF Transceiver
Applications
2.4 GHz IEEE 802.15.4 systems
ZigBee systems
Consumer Electronics
Industrial Control
Home/building automation
PC peripherals
Product Description
The
CC2420 is a true single-chip 2.4 GHz
IEEE 802.15.4 compliant RF transceiver
designed for low-power and low-voltage
wireless applications.
CC2420 includes a
digital direct sequence spread spectrum
baseband modem providing a spreading
gain of 9 dB and an effective datarate of
250 kbps.
The
CC2420 is a low-cost, highly integrated
solution for robust wireless communication
in the 2.4 GHz unlicensed ISM band. It
complies with world-wide regulations
covered by EN 300 440 (Europe), CFR47
Part 15 (US) and ARIB STD-T-66 (Japan).
The
CC2420 provides extensive hardware
support for packet handling, data
buffering, burst transmissions, data
encryption, data authentication, clear
channel assessment, link quality indication
and packet timing information. These
features reduce the load on the host
controller and allow
CC2420 to interface
low-cost microcontrollers.
The configuration interface and transmit /
receive FIFOs of
CC2420 are accessed via
a SPI interface. In a typical application
CC2420 will be used together with a
microcontroller and a few external passive
components.
CC2420 is based on Chipcon's SmartRF
-
03 technology in 0.18
m CMOS.
Key Features
True single-chip 2.4 GHz IEEE
802.15.4 compliant RF transceiver
with baseband modem and MAC
support
DSSS baseband modem with 2
MChips/s and 250 kbps effective data
rate.
Suitable for both RFD and FFD
operation
Low current consumption (RX: 19.7
mA, TX: 17.4 mA)
Low supply voltage (2.1 3.6 V) with
integrated voltage regulator
Low supply voltage (1.6 2.0 V) with
external voltage regulator
Programmable output power
No external RF switch / filter needed
I/Q low-IF receiver
I/Q direct upconversion transmitter
Very few external components
128 (RX) + 128 (TX) byte data
buffering
Digital RSSI / LQI support
Hardware MAC encryption (AES-128)
Battery monitor
QLP-48 package, 7x7 mm
Complies with EN 300 440 and FCC
CFR-47 part 15, ARIB STD-T-66
Powerful and flexible development
tools available
This document contains information on a pre-production product. Specifications and information herein are subject to
change without notice.
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Page 1 of 85
SmartRF
CC2420
Table of contents
Abbreviations_____________________________________________________________________4
References _______________________________________________________________________5
Features _________________________________________________________________________6
Absolute Maximum Ratings _________________________________________________________7
Electrical Specifications ____________________________________________________________8
Pin Assignment __________________________________________________________________13
Circuit Description _______________________________________________________________15
Application Circuit _______________________________________________________________17
Input / output matching ___________________________________________________________17
Bias resistor ____________________________________________________________________17
Crystal ________________________________________________________________________17
Voltage regulator________________________________________________________________17
Power supply decoupling and filtering _______________________________________________17
IEEE 802.15.4 Modulation Format __________________________________________________21
Configuration Overview ___________________________________________________________22
Evaluation Software ______________________________________________________________22
4-wire Serial Configuration and Data Interface________________________________________23
Register access _________________________________________________________________23
Status byte _____________________________________________________________________24
Command strobes _______________________________________________________________25
RAM access____________________________________________________________________25
FIFO access ____________________________________________________________________27
Multiple SPI access ______________________________________________________________27
Microcontroller Interface and Pin Description ________________________________________28
Configuration interface ___________________________________________________________28
Receive mode __________________________________________________________________29
RXFIFO overflow _______________________________________________________________29
Transmit mode__________________________________________________________________30
General control and status pins _____________________________________________________30
Demodulator, Symbol Synchroniser and Data Decision _________________________________31
Frame Format ___________________________________________________________________31
Synchronisation header ___________________________________________________________32
Length field ____________________________________________________________________33
MAC protocol data unit___________________________________________________________33
Frame check sequence____________________________________________________________33
RF Data Buffering________________________________________________________________34
Buffered transmit mode___________________________________________________________35
Buffered receive mode ___________________________________________________________35
Un-buffered, serial mode__________________________________________________________35
Address Recognition ______________________________________________________________36
Acknowledge Frames _____________________________________________________________37
Radio control state machine ________________________________________________________39
MAC Security Operations (Encryption and Authentication) _____________________________41
Keys__________________________________________________________________________41
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Page 2 of 85
SmartRF
CC2420
Nonce / counter _________________________________________________________________41
Stand-alone encryption ___________________________________________________________42
In-line security operations _________________________________________________________42
CTR mode encryption / decryption __________________________________________________43
CBC-MAC_____________________________________________________________________43
CCM _________________________________________________________________________43
Timing ________________________________________________________________________44
Linear IF and AGC Settings________________________________________________________45
RSSI / Energy Detection ___________________________________________________________45
Link Quality Indication ___________________________________________________________46
Clear Channel Assessment _________________________________________________________46
Frequency and Channel Programming _______________________________________________47
VCO and PLL Self-Calibration _____________________________________________________47
VCO _________________________________________________________________________47
PLL self-calibration______________________________________________________________47
Output Power Programming _______________________________________________________48
Voltage Regulator ________________________________________________________________49
Battery Monitor__________________________________________________________________49
Crystal Oscillator ________________________________________________________________51
Input / Output Matching __________________________________________________________52
Transmitter Test Modes ___________________________________________________________52
Unmodulated carrier _____________________________________________________________52
Modulated spectrum _____________________________________________________________53
System Considerations and Guidelines _______________________________________________55
Frequency hopping and multi-channel systems_________________________________________55
Data burst transmissions __________________________________________________________55
Crystal accuracy and drift _________________________________________________________55
Communication robustness ________________________________________________________55
Communication security __________________________________________________________55
Low cost systems________________________________________________________________56
Battery operated systems__________________________________________________________56
BER / PER measurements _________________________________________________________56
PCB Layout Recommendations _____________________________________________________57
Antenna Considerations ___________________________________________________________57
Configuration Registers ___________________________________________________________59
Test Output Signals_______________________________________________________________79
Package Description (QLP 48) ______________________________________________________81
Package thermal properties ________________________________________________________82
Soldering information ____________________________________________________________82
Plastic tube specification __________________________________________________________82
Carrier tape and reel specification___________________________________________________82
Ordering Information _____________________________________________________________83
General Information ______________________________________________________________84
Address Information ______________________________________________________________85
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Page 3 of 85
SmartRF
CC2420
Abbreviations
ADC
-
Analog to Digital Converter
AES
-
Advanced Encryption Standard
AGC
-
Automatic Gain Control
ARIB
-
Association of Radio Industries and Businesses
BER
-
Bit Error Rate
CBC-MAC
-
Cipher Block Chaining Message Authentication Code
CCA
-
Clear Cannel Assessment
CCM
-
Counter mode + CBC-MAC
CFR
-
Code of Federal Regulations
CTR
-
Counter mode (encryption)
CW
-
Continuous
Wave
DAC
-
Digital to Analog Converter
DSSS
-
Direct Sequence Spread Spectrum
ESD
-
Electro Static Discharge
ESR
-
Equivalent Series Resistance
EVM
-
Error Vector Magnitude
FCC
-
Federal Communications Commission
FCF
-
Frame Control Field
FIFO
-
First In First Out
FFCTRL
-
FIFO and Frame Control
HSSD
-
High Speed Serial Debug
IEEE
-
Institute of Electrical and Electronics Engineers
IF - Intermediate
Frequency
ISM
-
Industrial, Scientific and Medical
ITU-T
-
International Telecommunication Union Telecommunication
Standardization
Sector
I/O
-
Input / Output
I/Q
-
In-phase / Quadrature-phase
kbps
-
kilo bits per second
LNA
-
Low-Noise
Amplifier
LO
- Local
Oscillator
LQI
-
Link Quality Indication
LSB
-
Least Significant Bit / Byte
MAC
-
Medium Access Control
MFR
-
MAC
Footer
MHR
-
MAC
Header
MIC
-
Message Integrity Code
MPDU
-
MAC Protocol Data Unit
MSDU
-
MAC Service Data Unit
NA
- Not
Available
NC
- Not
Connected
O-QPSK
-
Offset - Quadrature Phase Shift Keying
PA
- Power
Amplifier
PCB
-
Printed Circuit Board
PER
-
Packet Error Rate
PHY
-
Physical
Layer
PHR
-
PHY
Header
PLL
-
Phase Locked Loop
PSDU
-
PHY Service Data Unit
QLP
-
Quad Leadless Package
RAM
-
Random Access Memory
RBW
-
Resolution
BandWidth
RF
- Radio
Frequency
RSSI
-
Receive Signal Strength Indicator
RX
- Receive
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Page 4 of 85
SmartRF
CC2420
SHR
-
Synchronisation
Header
SPI
-
Serial Peripheral Interface
TBD
-
To Be Decided / To Be Defined
T/R
-
Transmit / Receive
TX
- Transmit
VCO
-
Voltage Controlled Oscillator
VGA
-
Variable Gain Amplifier
References
[1]
IEEE std. 802.15.4/D18 - 2003: Wirelesss Medium Access Control (MAC)
and Physical Layer (PHY) specifications for Low Rate Wireless Personal
Area Networks (LR-WPANs)
http://www.ieee802.org/15/pub/TG4.html
[2]
NIST FIPS Pub 197: Advanced Encryption Standard (AES), Federal
Information Processing Standards Publication 197, US Department of
Commerce/N.I.S.T., November 20014. Available from the NIST website.
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
[3]
R. Housley, D. Whiting, N. Ferguson, Counter with CBC-MAC (CCM),
submitted to NIST, June 3, 2002. Available from the NIST website.
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Page 5 of 85
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