Single-Chip Low Cost Low Power RF-Transceiver (Rev. B

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CC2500Component Value ManufacturerC51 100 nF ±10%, 0402 X5R Murata GRM15 seriesC81 27 pF ±5%, 0402 NP0 Murata GRM15 seriesC101 27 pF ±5%, 0402 NP0 Murata GRM15 seriesC121 100 pF ±5%, 0402 NP0 Murata GRM15 seriesC122 1.0 pF ±0.25 pF, 0402 NP0 Murata GRM15 seriesC123 1.8 pF ±0.25 pF, 0402 NP0 Murata GRM15 seriesC124 1.5 pF ±0.25 pF, 0402 NP0 Murata GRM15 seriesC131 100 pF ±5%, 0402 NP0 Murata GRM15 seriesC132 1.0 pF ±0.25 pF, 0402 NP0 Murata GRM15 seriesL121 1.2 nH ±0.3 nH, 0402 monolithic Murata LQG15HS seriesL122 1.2 nH ±0.3 nH, 0402 monolithic Murata LQG15HS seriesL131 1.2 nH ±0.3 nH, 0402 monolithic Murata LQG15HS seriesR171 56 kΩ ±1%, 0402 Koa RK73 seriesXTAL 26.0 MHz surface mount crystal NDK, AT-41CD2Table 15: Bill Of Materials for the Application CircuitMeasurements have been performed withmulti-layer inductors from other manufacturers(e.g. Würth) and the measurement resultswere the same as when using the Murata part.The Gerber files for the CC2500EM referencedesign ([4]) are available from the TI website.Figure 4: CC2500EM Reference Design ([4])8 Configuration OverviewCC2500 can be configured to achieve optimumperformance for many different applications.Configuration is done using the SPI interface.The following key parameters can beprogrammed:• Power-down / power up mode• Crystal oscillator power-up / power-down• Receive / transmit mode• RF channel selection• Data rate• Modulation format• RX channel filter bandwidth• RF output power• Data buffering with separate 64-bytereceive and transmit FIFOs• Packet radio hardware support• Forward Error Correction (FEC) withinterleaving• Data Whitening• Wake-On-Radio (WOR)Details of each configuration register can befound in Section 32, starting on page 58.Figure 5 shows a simplified state diagram thatexplains the main CC2500 states, together withtypical usage and current consumption. Fordetailed information on controlling the CC2500state machine, and a complete state diagram,see Section 19, starting on page 40.SWRS040B Page 20 of 92
CC2500Default state when the radio is notreceiving or transmitting. Typ.current consumption: 1.5mA.Used for calibrating frequencysynthesizer upfront (enteringreceive or transmit mode can Manual freq.then be done quicker). synth. calibrationTransitional state. Typ. currentconsumption: 7.4mA.SCALSIDLESPWD or wake-on-radio (WOR)IdleCSn=0CSn=0SXOFFSRX or STX or SFSTXON or wake-on-radio (WOR)SleepCrystaloscillator offLowest power mode. Mostregister values are retained.Typ. current consumption400nA, or 900nA whenwake-on-radio (WOR) isenabled.All register values areretained. Typ. currentconsumption; 0.16mA.Frequency synthesizer is on,ready to start transmitting.Transmission starts veryquickly after receiving theSTX command strobe.Typ.current consumption: 7.4mA.Frequencysynthesizer onSFSTXONFrequencysynthesizer startup,optional calibration,settlingSTXFrequency synthesizer is turned on, can optionally becalibrated, and then settles to the correct frequency.Transitional state. Typ. current consumption: 7.4mA.SRX or wake-on-radio (WOR)STXTXOFF_MODE=01SFSTXON or RXOFF_MODE=01Typ. current consumption:11.1mA at -12dBm output,15.1mA at -6dBm output,21.2mA at 0dBm output.Transmit modeSTX or RXOFF_MODE=10SRX or TXOFF_MODE=11Receive modeTyp. currentconsumption:from 13.3mA (stronginput signal) to 16.6mA(weak input signal).In FIFO-based modes,transmission is turned offand this state entered if theTX FIFO becomes empty inthe middle of a packet. Typ.current consumption: 1.5mA.TX FIFOunderflowTXOFF_MODE=00RXOFF_MODE=00Optional transitional state. Typ.current consumption: 7.4mA.Optional freq.synth. calibrationRX FIFOoverflowIn FIFO-based modes,reception is turned off andthis state entered if the RXFIFO overflows. Typ.current consumption:1.5mA.SFTXSFRXIdleFigure 5: Simplified State Diagram with Typical Usage and Current Consumption at 250 kBaudData Rate and MDMCFG2.DEM_DCFILT_OFF=1 (current optimized)9 Configuration SoftwareCC2500 can be configured using the SmartRF ®Studio software [5]. The SmartRF ® Studiosoftware is highly recommended for obtainingoptimum register settings, and for evaluatingperformance and functionality. A screenshot ofthe SmartRF ® Studio user interface for CC2500is shown in Figure 6.After chip reset, all the registers have defaultvalues as shown in the tables in Section 32.The optimum register setting might differ fromthe default value. After a reset all registers thatshall be different from the default valuetherefore needs to be programmed through theSPI interface.SWRS040B Page 21 of 92
Page 1 and 2: 6789CC2500CC2500Low-Cost Low-Power
Page 3 and 4: CC2500AbbreviationsAbbreviations us
Page 5 and 6: CC250016.3 AMPLITUDE MODULATION ...
Page 7 and 8: CC25001 Absolute Maximum RatingsUnd
Page 9 and 10: CC2500Current consumption,TX states
Page 11 and 12: CC2500Parameter Min Typ Max Unit Co
Page 13 and 14: CC25004.4 Crystal OscillatorTc = 25
Page 15 and 16: CC25004.7 Analog Temperature Sensor
Page 17 and 18: CC2500Pin # Pin name Pin type Descr
Page 19: CC2500balun that converts the diffe
Page 23 and 24: CC2500Figure 7: Configuration Regis
Page 25 and 26: CC2500by the radio hardware (e.g. M
Page 27 and 28: CC2500The GDO0 pin can also be used
Page 29 and 30: CC250014.3 Byte SynchronizationByte
Page 31 and 32: CC2500The preamble pattern is an al
Page 33 and 34: CC2500options. Refer also to the CC
Page 35 and 36: CC2500The fraction of a symbol peri
Page 37 and 38: CC2500IOCFGx.GDOx_CFG=14 and in the
Page 39 and 40: CC250018.2 InterleavingData receive
Page 41 and 42: CC250019.1.1 Automatic PORA power-o
Page 43 and 44: CC2500Event 1 follows Event 0 after
Page 45 and 46: CC25001. Read RXBYTES.NUM_RXBYTESre
Page 47 and 48: CC250023 Voltage RegulatorsCC2500 c
Page 49 and 50: CC250025 SelectivityFigure 22 to Fi
Page 51 and 52: CC250026 Crystal OscillatorA crysta
Page 53 and 54: CC250029 General Purpose / Test Out
Page 55 and 56: CC250030 Asynchronous and Synchrono
Page 57 and 58: CC250031.6 Crystal Drift Compensati
Page 59 and 60: CC2500Address Register DescriptionP
Page 61 and 62: CC25000x000x010x020x030x040x050x060
Page 63 and 64: CC25000x03: FIFOTHR - RX FIFO and T
Page 65 and 66: CC25000x08: PKTCTRL0 - Packet Autom
Page 67 and 68: CC25000x10: MDMCFG4 - Modem Configu
Page 69 and 70: CC25000x13: MDMCFG1 - Modem Configu
Page 71 and 72:
CC25000x16: MCSM2 - Main Radio Cont
Page 73 and 74:
CC25000x18: MCSM0 - Main Radio Cont
Page 75 and 76:
CC25000x1A: BSCFG - Bit Synchroniza
Page 77 and 78:
CC25000x1C: AGCCTRL1 - AGC ControlB
Page 79 and 80:
CC25000x1F: WOREVT0 - Low Byte Even
Page 81 and 82:
CC25000x25: FSCAL1 - Frequency Synt
Page 83 and 84:
CC25000x33 (0xF3): LQI - Demodulato
Page 85 and 86:
CC25000x3B (0xFB): RXBYTES - Underf
Page 87 and 88:
CC250033.1 Recommended PCB Layout f
Page 89 and 90:
CC250036 General Information36.1 Do
Page 91 and 92:
CC250037 Address InformationTexas I
Page 93:
IMPORTANT NOTICETexas Instruments I
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