Rssi / Carrier Sense | Texas Instruments 3138 155 232931 instruction

					CC2420

Parameter	Min.	Typ.	Max.	Unit	Condition / Note
Frequency error tolerance	-300		300	kHz	Difference between centre
					frequency of the received RF
					signal and local oscillator
					frequency
					[1] requires 200 kHz

Symbol rate error tolerance			120	ppm	Difference between incoming
					symbol rate and the internally
					generated symbol rate
					[1] requires 80 ppm

Data latency		3		∝s	Processing delay in receiver.
					Time from complete transmission
					of SFD until complete reception
					of SFD, i.e. from SFD goes active
					on transmitter until active on
					receiver.

6.4RSSI / Carrier Sense

Parameter	Min.	Typ.	Max.	Unit	Condition / Note
Carrier sense level		− 77		dBm	Programmable in
					RSSI.CCA_THR
RSSI dynamic range		100		dB	The range is approximately from
					–100 dBm to 0 dBm
RSSI accuracy		± 6		dB	See page 48 for details
RSSI linearity		± 3		dB
RSSI linearity		± 3		dB
RSSI average time		128		∝s	8 symbol periods, as specified by
					[1]

6.5 IF Section

Parameter	Min.	Typ.	Max.	Unit	Condition / Note
Intermediate frequency (IF)		2		MHz

6.6Frequency Synthesizer Section

Parameter

Min.

Typ.

Max.

Unit

Condition / Note

Crystal oscillator frequency		16		MHz	See page 53 for details.
Crystal frequency accuracy	- 40		40	ppm	Including aging and temperature
requirement					dependency, as specified by [1]

Crystal operation		Parallel			C381 and C391 are loading
					capacitors, see page 53

SWRS041B

Page 11 of 89

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Texas Instruments 3138 155 232931 manual Rssi / Carrier Sense, If Section, Frequency Synthesizer Section

Contents

Product Description Key FeaturesApplications Table of contents RF Data Buffering Ordering Information General Information ITU-T Abbreviations References Features Parameter Min Typ Max Units Condition Absolute Maximum RatingsOperating Conditions Parameter Min Max Units Condition Parameter Min Typ Max Unit Condition / Note Electrical SpecificationsOverall Transmit Section Receive Section Frequency Synthesizer Section Rssi / Carrier SenseIf Section VDD Digital Inputs/Outputs Voltage Regulator Battery MonitorPower Supply CC2420 Pin Pin Name Pin type Pin Description Pin Assignment Avddadc Circuit Description CC2420 simplified block diagram CC2420 Bias resistor Power supply decoupling and filteringApplication Circuit Input / output matching Description Overview of external components Transceiver Transceiver Bill of materials for the application circuits Ieee 802.15.4 Modulation Format Symbol Chip sequence C0, C1, C2, … , C31 Phase Configuration Overview SmartRF Studio user interface Evaluation Software Register access 13 4-wire Serial Configuration and Data InterfacePin configuration Parameter Symbol Min Max Units Conditions SPI timing specification Status byte RAM access Configuration registers write and read operations via SPI Address Byte Ordering Name Description CC2420 RAM Memory Space Fifo accessMultiple SPI access Microcontroller Interface and Pin Description Configuration interface Rxfifo overflow Receive mode Pin activity examples during receive Demodulator, Symbol Synchroniser and Data Decision Frame Format Demodulator Simplified Block Diagram MAC protocol data unit Transmitted Synchronisation Header Length field Format of the Frame Control Field FCF Frame check sequence RF Data Buffering Buffered transmit modeBuffered receive mode Fifop Unbuffered, serial mode Acknowledge Frames Address Recognition Acknowledge frame format Radio control state machine Radio control states Ieee 802.15.4 Nonce MAC Security Operations Encryption and AuthenticationKeys Nonce / counter In-line security operations CC2420 Security Flag Byte Stand-alone encryption 21.7 CCM CTR mode encryption / decryptionCBC-MAC Timing Linear if and AGC SettingsMode LMIC Time Rssi / Energy Detection RF Level dBm Link Quality IndicationValue Frequency and Channel Programming Clear Channel Assessment 27.1 VCO Output Power ProgrammingVCO and PLL Self-Calibration Voltage Regulator Voltage regulator, simplified schematic Battery Monitor Crystal Oscillator Unmodulated carrier Input / Output MatchingTransmitter Test Modes Crystal oscillator component values CC2420 Modulated spectrum plot System Considerations and Guidelines BER / PER measurements Battery operated systemsLow-cost systems Antenna Considerations PCB Layout Recommendations CC2420 Address Register Register type Description Configuration Registers Saes Configuration registers overview XOSC16MBYPASS Bit Field Name ResetMain 0x10 Main Control Register CCAHYST20 CCAMODE10 Autocrc Autoack Preamblelength MDMCTRL0 0x11 Modem Control RegisterReservedframemode Pancoordinator Adrdecode RSSIVAL70 MDMCTRL1 0x12- Modem Control RegisterRssi 0x13 Rssi and CCA Status and Control Register CORRTHR40 Demodavgmode Modulationmode Txctrl 0x15 Transmit Control Register Syncword 0x14 Sync Word RXMIXBUFCUR10 RXCTRL0 0x16 Receive control register RXCTRL1 0x17 Receive control register Caldone Calrunning Locklength Lockstatus Fsctrl 0x18 Frequency Synthesizer Control and Status SECMODE10 SECCTRL0 0x19 Security Control Register Battmonok Battmonen Battmonvoltage Battmon 0x1B Battery Monitor Control registerSECCTRL1 0x1A Security Control Register Sectxl Secrxl HSSDSRC20 SFDMUX40 CCAMUX40 IOCFG0 0x1C I/O Configuration RegisterIOCFG1 0x1D I/O Configuration Register Manfidl 0x1E Manufacturer ID, Lower 16 Bit Fsmtc 0x20 Finite state machine time constants Manfidh 0x1F Manufacturer ID, Upper 16 Bit Isused = is * Isandmask + Isormask Manand 0x21 Manual signal and override register1 Lnamixgainmodeo Manor 0x22 Manual signal or override registerAgcctrl 0x23 AGC Control Vgagainoe AGCTST2 0x26 AGC Test Register AGCTST0 0x24 AGC Test RegisterAGCTST1 0x25 AGC Test Register FSTST2 0x29 Frequency Synthesizer Test Register FSTST0 0x27 Frequency Synthesizer Test RegisterFSTST1 0x28 Frequency Synthesizer Test Register Fsmstate 0x2C Finite state machine information FSTST3 0x2A Frequency Synthesizer Test RegisterRxbpftst 0x2B Receiver Bandpass Filters Test Register Dactst 0x2E DAC Test Register AdcclockdisableAdctst 0x2D ADC Test Register Rxfifo 0x3F Receive Fifo Byte register Oscillator must be running for accessing the RxfifoToptst 0x2F Top Level Test Register Txfifo 0x3E Transmit Fifo Byte register Signal output on CCA pin Description Test Output SignalsCCA test signal select table Signal output on SFD pin Description SFD test signal select table Quad Leadless Package QLP Package Description QLP Thermal resistance Recommended layout for package QLPPackage thermal properties Soldering information Tape and Reel Specification 40.3 Plastic tube specification40.4 Carrier tape and reel specification Tube Specification Revision Date Description/Changes General Information42.1 Document History Product Status Definitions Data Sheet Identification Product Status Definition Product Information Centers Address InformationTI Worldwide Technical Support Internet 2007, Texas Instruments. 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