AX-SFEU, AX-SFEU-API Ultra-Low Power, Transceiver IC For .

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AX-SFEU, AX-SFEU-APIUltra-Low Power,AT Command / API Controlled,Sigfox) CompliantTransceiver IC for Up-Linkand Down-Linkwww.onsemi.com 10 GPIO pinsOVERVIEW Circuit DescriptionAX SFEU and AX SFEU API are ultra low powersingle chip solutions for a node on the Sigfox network withboth up and down link functionality. The AX SFEU chipis delivered fully ready for operation and contains all thenecessary firmware to transmit and receive data from theSigfox network in Europe. It connects to the customerproduct using a logic level RS232 UART. AT commands areused to send frames and configure radio parameters.The AX SFEU API variant is intended for customerswishing to write their own application software based on theAX SF LIB 1 GEVK library. 4 GPIO pins with selectable voltage measurefunctionality, differential (1 V or 10 V range) orsingle ended (1 V range) with 10 bit resolution2 GPIO pins with selectable sigma delta DACoutput functionality2 GPIO pins with selectable output clock3 GPIO pins selectable as SPI master interfaceIntegrated RX/TX switching with differentialantenna pinsPower Consumption Ultra low Power Consumption: Charge required to send a Sigfox OOB packet at14 dBm output power: 0.28 C Deep Sleep mode current: 100 nA Sleep mode current: 1.3 mA Standby mode current: 0.5 mA Continuous radio RX mode at 869.525 MHz :10 mA Continuous radio TX mode at 868.130 MHz19 mA @ 0 dBm49 mA @ 14 dBmFeaturesFunctionality and Ecosystem Sigfox up link and down link functionality controlledby AT commands or API The AX SFEU and AX SF API ICs are part of awhole development and product ecosystem availablefrom ON Semiconductor for any Sigfox requirement.Other parts of the ecosystem include Ready to go development kitDVK SFEU [API] 1 GEVK including a 2 yearSigfox subscription Sigfox Ready certified reference design for theAX SFEU and AX SFEU API ICs AX SF10 MINI21 868 B1 andAX SF10 ANT21 868 B1, Sigfox compliant SMTmodules based on AX SFEU with 50 W pads or chipantenna. Not available for AX SFEU APIHigh Performance Narrow band Sigfox RF Transceiver Receiver Carrier frequency 869.525 MHz Data rate 600 bps FSK Sensitivity 126 dBm @ 600 bps, 869.525 MHz, GFSK 0 dBm maximum input power Transmitter Carrier frequency 868.13 MHz Data rate 100 bps PSK High efficiency, high linearity integrated poweramplifier Maximum output power 14 dBm Power level programmable in 1 dBm stepsGeneral FeaturesQFN40 5 mm x 7 mm packageSupply range 2.1 3.6 V 40 C to 85 CTemperature sensorSupply voltage measurements ApplicationsSigfox networks up link and down link. Semiconductor Components Industries, LLC, 2017April, 2018 Rev. 81Publication Order Number:AX SFEU/D

AX SFEU, AX SFEU APIBLOCK DIAGRAMAX SFEU / AX SFEU itch andantennainterfaceUARTRXUARTTXCALRF O[9:0]GPIOCPUADCpower mode controlRAMProgrammemory(FLASH)Sigfox identity (ID, PAC)RESET NVTCXOSigfox compliantapplication(AX SFEU only)VDD ANATX LEDRX LEDdedicatedstatusoutputsVDD IOCPU LEDGNDRADIO LEDFigure 1. Functional Block Diagram of the AX SFEU / AX SFEU APIwww.onsemi.com2

AX SFEU, AX SFEU APITable 1. PIN FUNCTION DESCRIPTIONSSymbolPin(s)TypeVDD ANA1PAnalog power output, decouple to neighboring GNDDescriptionGND2PGround, decouple to neighboring VDD ANAANTP3ADifferential antenna input/outputANTN4ADifferential antenna input/outputNC5NDo not connectGND6PGround, decouple to neighboring VDD ANAVDD ANA7PAnalog power output, decouple to neighboring GNDGND8PGroundFILT9ASynthesizer filterL210AMust be connected to pin L1L111AMust be connected to pin L2Do not connectNC12NGPIO813I/O/PUGeneral purpose IOGPIO714I/O/PUGeneral purpose IO, selectable SPI functionality (MISO)GPIO615I/O/PUGeneral purpose IO, selectable SPI functionality (MOSI)GPIO516I/O/PUGeneral purpose IO, selectable SPI functionality (SCK)GPIO417I/O/PUGeneral purpose IO, selectable SD DAC functionality, selectable clockfunctionalityCPU LED18OCPU activity indicatorRADIO LED19ORadio activity indicatorVTCXO20OTCXO powerGPIO921I/O/PUUARTTX22OUART transmitUARTRX23I/PUUART receiveRXLED/DBG DATA24OI/OReceive activity indicator in AX SFEUDebugger data line in AX SFEU APITXLED/DBG CLK25OITransmit activity indicator in AX SFEUDebugger clock line in AX SFEU APINC/DBG EN26PDPDDo not connect in AX SFEUDebugger enable line in AX SFEU APIRESET N27I/PUOptional reset pin. Internal pull up resistor is permanently enabled, neverthelessit is recommended to connect this pin to VDD IO if it is not usedGND28PGroundVDD IO29PUnregulated power supplyGPIO030I/O/A/PUGeneral purpose IO, selectable ADC functionality, selectable SD DACfunctionality, selectable clock functionalityGPIO131I/O/A/PUGeneral purpose IO, selectable ADC functionalityGPIO232I/O/A/PUGeneral purpose IO, selectable ADC functionalityNC33NDo not connectNC34NDo not connectGPIO335I/O/A/PUVDD IO36PUnregulated power supplyCAL37AConnect to FILT as shown in the application diagramNC38NDo not connectGeneral purpose IO, wakeup from deep sleepGeneral purpose IO, selectable ADC functionalitywww.onsemi.com3

AX SFEU, AX SFEU APITable 1. PIN FUNCTION DESCRIPTIONSSymbolPin(s)TypeDescriptionCLKN39ATCXO interfaceCLKP40ATCXO interfaceGNDCenter padPGround on center pad of QFN, must be connectedA analogI digital input signalO digital output signalPU pull upI/O digital input/output signalN not to be connectedP power or groundPD pull downTable 2.All digital inputs are Schmitt trigger inputs, digital inputand output levels are LVCMOS/LVTTL compatible. PinsGPIO[3:0] must not be driven above VDD IO, all otherdigital inputs are 5 V tolerant. All GPIO pins and UARTRXstart up as input with pull up. For explanations on how touse the GPIO pins, see chapter “AT Commands”.PinPossible GPIO ModesGPIO00, 1, Z, U, A, TGPIO10, 1, Z, U, AGPIO20, 1, Z, U, AGPIO30, 1, Z, U, AGPIO40, 1, Z, U, TGPIO50, 1, Z, UGPIO60, 1, Z, UGPIO70, 1, Z, UGPIO80, 1, Z, UGPIO90, 1, Z, U0 pin drives low1 pin drives highA pin is analog inputT pin is driven by clock or DACU pin is input with pull upZ pin is high impedance inputCLKNNCCALVDD IOGPIO3NCNCGPIO2GPIO1GPIO0VDD IO403938373635343332313029128GNDGND227RESET NANTP326NC/DBG ENANTN425TXLED/DBG CLKNC524RXLED/DBG 9GPIO8GNDNCVDD ANAQFN40L1GNDAX SFEU / AX SFEU APIL2VDD ANACLKPPinout DrawingPins 24 26 have different functionalities in AT command and API versions, sofor these pins AX SFEU/AX SFEU API explanations are shown respectively.Figure 2. Pinout Drawing (Top View)www.onsemi.com4

AX SFEU, AX SFEU APISPECIFICATIONSTable 3. ABSOLUTE MAXIMUM RATINGSSymbolDescriptionVDD IOSupply voltageIDDSupply currentPtotTotal power consumptionConditionPiAbsolute maximum input power at receiver inputII1DC current into any pin except ANTP, ANTNII2DC current into pins ANTP, ANTNIOOutput CurrentViaInput voltage ANTP, ANTN pinsInput voltage digital pinsMinMaxUnits 0.55.5V200mA800mW10dBm 1010mA 100100mA40mA 0.55.5V 0.55.5V 20002000VANTP and ANTNpins in RX modeVesElectrostatic handlingHBMTambOperating temperature 4085 CTstgStorage temperature 65150 CTjJunction Temperature150 CStresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionalityshould not be assumed, damage may occur and reliability may be affected.1. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.www.onsemi.com5

AX SFEU, AX SFEU APIDC CharacteristicsTable 4. SUPPLIESConditions for all current and charge values unless otherwise specified are for the hardware configuration described in the AX SFEUApplication Note: Sigfox Compliant Reference BOperational ambient temperature 402785 CVDDIOI/O and voltage regulator supplyvoltage2.13.03.6VVDDIO R1I/O voltage ramp for reset activationRamp starts at VDD IO 0.1 V0.1V/msVDDIO R2I/O voltage ramp for reset activationRamp starts at 0.1 V VDD IO 0.7 V3.3V/msIDSDeep sleep mode currentAT P 2100nAISLPSleep mode currentAT P 11.3mA0.5mAISTDBYStandby mode currentNote 2IRX CONTCurrent consumption continuous RXAT SE10mAQSFX OOB 0Charge to send a Sigfox out of bandmessage, 0 dBmAT S00.12CQSFX BIT 0Charge to send a bit, 0 dBmAT SB 00.08CCharge to send a bit with downlinkreceive, 0 dBmAT SB 0,10.27CQSFX LFR 0Charge to send the longest possibleSigfox frame (12 byte) , 0dBmAT SF 00112233445566778899aabb0.14CQSFX LFRDL 0Charge to send the longest possibleSigfox frame (12 byte) with downlinkreceive, 0 dBmAT SF 00112233445566778899aabb,10.27CQSFX OOB 14Charge to send a Sigfox out of bandmessage, 14 dBmAT S00.28CQSFX BIT 14Charge to send a bit, 14 dBmAT SB 00.20CCharge to send a bit with downlinkreceive, 14 dBmAT SB 0,10.35CQSFX LFR 14Charge to send the longest possibleSigfox frame (12 byte) , 14 dBmAT SF 00112233445566778899aabb0.39CQSFX LFRDL 14Charge to send the longest possibleSigfox frame (12 byte) with downlinkreceive, 14 dBmAT SF 00112233445566778899aabb,10.46CITXMOD0AVGModulated Transmitter Current,Note 1Pout 0 dBm; average19.0mAITXMOD14AVGModulated Transmitter Current,Note 1Pout 14 dBm; average49.0mAQSFX BITDL 0QSFX BITDL 141. The output power of the AX SFEU / AX SFEU API can be programmed in 1 dB steps from 0 dBm – 14 dBm. Current consumption valuesare given for a matching network that is optimized for 14 dBm output. 0 dBm transmission with typically 10 mA can be achieved with othernetworks that are optimized for 0 dBm operation.2. Internal 20 MHz oscillator, voltage conditioning and supervisory circuit running.www.onsemi.com6

AX SFEU, AX SFEU APITypical Current WaveformTypical Current Waveform Maximum Length Frame with Downlink Receive, Pout 14 dBm6050Current [mA]403020100010203040Time [s]Figure 3. Typical Current Waveform for a Maximum Length Frame with Downlink Receive at 14 dBm Output PowerBattery Life Examples Device in Sleep Neglecting battery self dischargeScenario 1: CR2032 coin cell battery One OOB frame transmitter per day at Pout 0 dBmCR2032 capacity225 mAh * 3600 s/h810 CSleep charge per day1.3 mA * 86400 s0.11 C/dayOOB frame transmission0.12 C/dayTotal Charge consumption0.23 C/dayBattery life9.6 Years Four maximum length frames with downlink receiveScenario 2: 2 AAA Alkaline batteries in series One OOB frame transmitter per day at Pout 14 dBmper day at Pout 14 dBm Device in Sleep Neglecting battery self discharge2 AAA alkaline capacity1500 mAh * 3600 s/h5400 CSleep charge per day1.3 mA * 86400 s0.11 C/dayOOB frame transmissionFrame transmission with downlink0.28 C/day4 * 0.46 C/day1.84 C/dayTotal Charge consumption2.26 C/dayBattery life6.5 Yearswww.onsemi.com7

AX SFEU, AX SFEU APITable 5. al InputsVDD IO 3.3 VVT Schmitt trigger low to high threshold pointVT Schmitt trigger high to low threshold pointVILInput voltage, lowVIHInput voltage, high2.0VIPAInput voltage range, GPIO[3:0] 0.5VDD IOVInput voltage range, GPIO[9:4], UARTRX 0.55.5VInput leakage current 1010mAVIPBCILRPU1.55V1.25V0.8Programmable Pull Up ResistanceVV65kWDigital OutputsIOHOutput Current, highPorts GPIO[9:0], UARTTX, TXLED, RXLED,TXLED, CPULEDVOH 2.4 V8mAIOLOutput Current, lowGPIO[9:0], UARTTX, TXLED, RXLED, TXLED,CPULEDVOL 0.4 V8mAIOZTri state output leakage current 1010mAAC CharacteristicsTable 6. TCXO REFERENCE INPUTSymbolfTCXODescriptionTCXO frequencyConditionMinA passive network between the TCXO outputand the pins CLKP and CLKN is required.For detailed TCXO network recommendationsdepending on the TCXO output swing refer tothe AX5043 Application Note: Use with aTCXO Reference Clock.For TCXO recommendations see the Ax SFEU Application Note: Sigfox Compliant Reference DesignTypMax48UnitsMHzTable 7. TRANSMITTERConditions for transmitter specifications unless otherwise specified with the antenna network from AX SFEU Application Note: SigfoxCompliant Reference Design and at 868.130 MHz.SymbolSBRDescriptionConditionSignal bit rateMinTypMaxUnits100bpsPTXminLowest Transmitter output powerAT CW 868130000,1,00dBmPTXmaxHighest Transmitter output powerAT CW 868130000,1,1414dBmPTXstepProgramming step size output power1dBdTXtempTransmitter power variation vs. temperature 40 C to 85 C 0.5dBdTXVddTransmitter power variation vs. VDD IO1.9 to 3.6 V 0.5dBdBcPTXharm2PTXharm3PTXharm4Emission @2ndharmonic 51Emission @3rdharmonic 63Emission @4thharmonic 84www.onsemi.com8

AX SFEU, AX SFEU APIFigure 4. Typical Spectrum with Harmonics at 14 dBm Output PowerTable 8. RECEIVERConditions for receiver specifications unless otherwise specified with the antenna network from AX SFEU Application Note: SigfoxCompliant Reference Design and at 869.525 MHz.SymbolSBRDescriptionConditionSignal bit rateISBER868AT SPN 4,n, BER 10 3MinTypMaxUnits600bps 126dBmBLK2M 868Blocking at 2 MHz offsetChannel/Blocker @ PER 0.1, wanted signallevel is 3 dB above the typical sensitivity, theblocker signal is CW68dBBLK10M 868Blocking at 10 MHzoffsetChannel/Blocker @ PER 0.1, wanted signallevel is 3 dB above the typical sensitivity, theblocker signal is CW78dBwww.onsemi.com9

AX SFEU, AX SFEU APITable 9. ADC / TEMPERATURE SENSORSymbolDescriptionADCRESADC resolutionVADCREFADC reference voltageZADC00ConditionMinTypMax100.951Input capacitanceUnitsBits1.05V2.5pFDNLDifferential nonlinearity 1LSBINLIntegral nonlinearity 1LSBOFFOffset3LSB0.8%GAIN ERRGain errorADC in Differential ModeVABS DIFFAbsolute voltages & common mode voltage indifferential mode at each inputVFS DIFF01Full swing input for differential signalsVFS DIFF100VDD IOVGain x1 500500mVGain x10 5050mVADC in Single Ended ModeVMID SEMid code input voltage in single ended modeVIN SE00Input voltage in single ended modeVFS SE01Full swing input for single ended signals0.5V0VDD IOVGain x101VTemperature SensorTRNGTemperature rangeAT T? 4085 CTERR CALTemperature errorAT T? 22 Cwww.onsemi.com10

AX SFEU, AX SFEU APICOMMAND INTERFACEGeneral InformationWhen using Deep Sleep mode, keep two things in mind:Everything is turned off, timers are not running at all and allsettings will be lost (use AT WR to save settings to flashbefore entering Deep Sleep mode). Out of band messageswill therefore not be sent. The pins states are frozen in DeepSleep mode. The user must ensure that this will not result incondition which would draw a lot of current.The chapter “Command Interface” is a documentation ofthe AT Command set for devices which do not have anAPI interface. To see whether the device is capable ofreceiving AT Commands, please refer to table “DeviceVersions”. If the device has been shipped with theAPI Interface, please refer to the SW manual and”apiexample” code delivered with AX SF LIB 1 GEVKfor an introduction on how to setup a project and how to usethe API Interface.AT CommandsNumerical Syntaxhexdigit :: [0 9A Fa f]hexnum :: “0x” hexdigit decnum :: “0” [1 9] [0 9]*octnum :: “0” [0 7] binnum :: “0b” [01] bit:: [01]optnum :: “ 1”frame:: (hexdigit hexdigit) uint:: hexnum decnum octnum binnumuint opt :: uint optnumSerial Parameters: 9600, 8, N, 1The AX SFEU uses the UART (pins UARTTX,UARTRX) to communicate with a host and uses a bitrate of9600 baud, no parity, 8 data bits and one stop bit.Power ModesCommand SyntaxA command starts with ‘AT’ (everything is casesensitive!), continues with the actual command followed byparameters (if any) and ends with any kind of whitespace(space, tab, newline etc.)If incorrect syntax is detected (“parsing error”) all inputis ignored up until the next whitespace character.Also note that any number can be entered in any format(Hexadecimal, Decimal, Octal and binary) by adding thecorresponding prefix (‘0x’, none, ‘0’, ‘0b’). The onlyexception is the ‘Send Frame’ command (AT SF) whichexpects a list of hexadecimal digits without any prefix.StandbyAfter Power Up and after finishing a SIGFOXtransmission, AX SFEU enters Standby mode. In Standbymode, AX SFEU listens on the UART for commands fromthe host. Also, OOB frames are transmitted whenever theOOB timer fires. To conserve power, the AX SFEU can beput into Sleep or turned off (Deep Sleep) completely.Return CodesA successful command execution is indicated by sending‘OK’. If a command returns a value (e.g. by querying aregister) only the value is returned.ExamplesBold text is sent to AX SFEU.AT SF aabb1234OKSends a Sigfox frame containing {0xaa : 0xbb : 0x12 : 0x34}without waiting for a response packet.AT SF 0011223344,1OKRX AA BB CC DDSends a Sigfox frame containing {0x00 : 0x11 : 0x22 : 0x33: 0x44} and waits for a response packet and outputs it on theUART.AT CB 0xAA,1OKThe ‘CB’ command sends out a continuous pattern of bits,in this case 0xAA 0b10101010.SleepThe command AT P 1 is used to put the AX SFEU intoSleep mode. In this mode, only the wakeup timer forout of band messages is still running. To wake theAX SFEU up from Sleep mode toggle the serial UARTRXpin, e.g. by sending a break (break is an RS232 framingviolation, i.e. at least 10 bit durations low). When an Out ofBand (OOB) message is due, AX SFEU automaticallywakes up to transmit the message, and then returns to Sleepmode.Deep SleepIn Deep Sleep mode, the AX SFEU is completely turnedoff and only draws negligible leakage current. Deep Sleepmode can be activated with AT P 2. To wake up fromDeep Sleep mode, GPIO9 is pulled to GND.www.onsemi.com11

AX SFEU, AX SFEU APIAT P 1OKThis transitions the device into sleep mode. Out of bandtransmissions will still be triggered. The UART is powereddown. The device can be woken up by a low level on theUART signal, i.e. by sending break.Table 10. COMMANDSCommandNameDescriptionATDummy CommandJust returns ‘OK’ and does nothing else. Can be used to check communication.AT SB bit[,bit]Send BitSend a bit status (0 or 1). Optional bit flag indicates if AX SFEUshould receive a downlink frame.AT SF frame[,bit]Send FrameSend payload data, 1 to 12 bytes. Optional bit flag indicates ifAX SFEU should receive a downlink frame.AT SOManually send out of bandmessageSend the out of band message.AT TR?Get the transmit repeatReturns the number of transmit repeats. Default: 2AT TR ?Get transmit repeat rangeReturns the allowed range of transmit repeats.AT TR uintSet transmit repeatSets the transmit repeat. Note: the TR value is effective only forframe transmission with downlink request (AT SF payload,1). Uplinkonly transmissions always use transmit repeat 2.ATSuint?Get RegisterQuery a specific configuration register’s value. See Table 11 for a listof registers.ATSuint uintSet RegisterChange a configuration register.ATSuint ?Get Register RangeReturns the range of allowed register values.AT IF uintSet TX FrequencySet the output carrier macro channel for Sigfox frames.AT IF?Get TX FrequencyGet the currently chosen TX frequency.AT DR uintSet RX FrequencySet the reception carrier macro channel for Sigfox frames.AT DR?Get RX FrequencyGet the currently chosen RX frequency.AT CW uint,bit[,uint opt]Continuous WaveTo run emission tests for Sigfox certification it is necessary to send acontinuous wave, i.e. just the base frequency without any modulation. Parameters:NameRangeDescriptionFrequency800000000 Continuous wave frequency in Hz.999999999, 0 Use 868130000 for Sigfox or 0 tokeep previous frequency.Mode0, 1Enable or disable carrier wave.Power0 14dBm of signal Default: 14Note: If the power parameter is omitted, then the default 14 is used.The value of register 302 has no effect on the AT CW mode.AT CB uint opt,bitTest Mode: TX constant byteFor emission testing it is useful to send a specific bit pattern. Thefirst parameter specifies the byte to send. Use ‘ 1’ for a(pseudo )random pattern. Parameters:NameRangeDescriptionPattern0 255, 1Byte to send. Use ‘ 1’ for a(pseudo )random pattern.Mode0, 1Enable or disable pattern test mode.AT T?Get TemperatureMeasure internal temperature and return it in 1/10th of a degreeCelsius.AT V?Get VoltagesReturn current voltage and voltage measured during the lasttransmission in mV.www.onsemi.com12

AX SFEU, AX SFEU APITable 10. COMMANDSCommandNameDescriptionAT I uintInformationDisplay various product information:0: Software Name & VersionExample Response: AX SF 1.1 RC11: Contact DetailsExample Response: onhelp@onsemi.com2: Silicon revision lower byteExample Response: 8F3: Silicon revision upper byteExample Response: 004: Major Firmware VersionExample Response: 15: Minor Firmware VersionExample Response: 07: Firmware Variant (Frequency Band etc. (EU/US))Example Response: RC18: Firmware VCS VersionExample Response: 09: SIGFOX Library VersionExample Response: UDL1 1.8.710: Device IDExample Response: 0001234511: PACExample Response: 0123456789ABCDEFAT P uintSet Power ModeTo conserve power, the AX SFEU can be put to sleep manually.Depending on power mode, you will be responsible for waking up theAX SFEU again!0: software reset (settings will be reset to values in flash)1: sleep (send a break to wake up)2: deep sleep (toggle GPIO9 or RESET N pin to wake up;the AX SFEU is not running and all settings will be reset!)AT WRSave ConfigWrite all settings to flash (RX/TX frequencies, registers) so theysurvive reset/deep sleep or loss of power.Use AT P 0 to reset the AX SFEU and load settings from flash.AT:Pn?Get GPIO PinReturn the setting of the GPIO Pin n; n can range from 0 to 9.A character string is returned describing the mode of the pin, followed by the actual value. If the pin is configured as analog pin, thenthe voltage (range 0 1 V) is returned. The mode characters havethe following meaning:ModeDescription01ZUATPin drives lowPin drives highPin is high impedance inputPin is input with pull upPin is analog input (GPIO pin 0 3 only)Pin is driven by clock or DAC (GPIO pin 0 and 4 only)The default mode after exiting reset is U on all GPIO pins.AT:Pn ?Get GPIO Pin RangePrint a list of possible modes for a pin. The table below lists theresponse.PinP0P1P2P3P4P5P6P7P8P9AT:Pn modeSet GPIO PinModes0, 1, Z, U, A, T0, 1, Z, U, A0, 1, Z, U, A0, 1, Z, U, A0, 1, Z, U, T0, 1, Z, U0, 1, Z, U0, 1, Z, U0, 1, Z, U0, 1, Z, USet the GPIO pin mode.For a list of the modes see the command AT:Pn?www.onsemi.com13

AX SFEU, AX SFEU APITable 10. COMMANDSCommandNameDescriptionAT:ADC Pn[ Pn [(1V 10V)]]?Get GPIO Pin Analog VoltageMeasure the voltage applied to a GPIO pin. The command alsoallows measurement of the voltage difference across two GPIO pins.In differential mode, the full scale range may also be specified as 1 Vor 10 V. Note however that the pin input voltages must not exceedthe range 0.VDD IO. The command returns the result as fraction ofthe full scale range (1 V if none is specified). The GPIO pinsreferenced should be initialized to analog mode before issuing thiscommand.AT:SPI[(A B C D)] bytesSPI TransactionThis command clocks out bytes on the SPI port. The clock frequency is312.5 kHz. The command returns the bytes read on MISO during output. Optionally the clocking mode may be specified (default is A):ModeABCDClock InversionClock rmalalternateNote that SEL, if needed, is not generated by this command,and must instead be driven using standard GPIO commands(AT:Pn 0 1).AT:CLK freq,reffreqSet Clock GeneratorOutput a square wave on the pin(s) set to T mode. The frequency ofthe square wave is (freq / 216) reffreq. Possible values for reffreqare 20000000, 10000000, 5000000, 2500000, 1250000, 625000,312500, 156250. Possible values for freq are 0 65535.AT:CLK OFFTurn off Clock GeneratorSwitch off the clock generatorAT:CLK?Get Clock GeneratorReturn the settings of the clock generator. Two numbers arereturned, freq and reffreq.AT:DAC valueSet SD DACOutput a SD DAC value on the pin(s) set to T mode. Parametervalue may be in the range 32768 32767. The average outputvoltage is (1/2 value / 217) VDD.An external low pass filter is needed to get smooth output voltages.The modulation frequency is 20 MHz. A possible low pass filterchoice is a simple RC low pass filter with R 10 kW and C 1 mF.AT:DAC OFFTurn off SD DACSwitch off the DACAT:DAC?Get SD DACReturn the DAC valuewww.onsemi.com14

AX SFEU, AX SFEU APITable 10. COMMANDSCommandNameDescriptionAT TM mode,configActivates the Sigfox TestmodeAvailable test modes:0. TX BPSKSend only BPSK with Synchro Bit Synchro frame PN sequence: No hopping centered on the TX frequency.Config bits 0 to 6 define the number of repetitions. Setting bit 7 to1 removes the delay between frames.1. TX Protocol:Tx mode with full protocol with Sigfox key: Send Sigfox protocolframes with initiate downlink flag True. Config defines thenumber of repetitions.2. RX Protocol:This mode tests the complete downlink protocol in Downlink only.Config defines the number of repetitions.3. RX GFSK:RX mode with known pattern with SB SF Pattern onRX frequency (internal comparison with received frame knownpattern AA AA B2 27 1F 20 41 84 32 68 C5 BA AE 79 E7 F6 DD9B. Config defines the RX on time in seconds.4. RX Sensitivity:Does uplink downlink frame with Sigfox key and specific timings.This test is specific to SIGFOX’s test equipments & softwares.5. TX Synthesis:Does one uplink frame on each Sigfox channel to measurefrequency synthesis step.AT PN mode,rep(Note 3)Send & Receive PN9 bitstreamfor BER measurementsAvailable modes:TX:0, 1: start sending PN9 bit stream0, 0: stop sending PN9 bit streamRX:3, rep: 3 digits BER precision4, rep: 4 digits BER precision5, rep: 5 digits BER precision (slow!)Mode 3 5 receive a PN9 bitstream and decodes it into a BERmeasurement. Reports BER on UART for each repetition.Rep is thenumber of measurements performed, valid range is 1 255.AT SEStarts AT TM 3,255 indefinitelyConvenience command for sensitivity testsAT SL[ frame]Send local loopSends a local loop frame with optional payload of 1 to 12 bytes.Default payload: 0x84, 0x32, 0x68, 0xC5, 0xBA, 0x53, 0xAE, 0x79,0xE7, 0xF6, 0xDD, 0x9B.AT RLReceive local loopStarts listening for a local loop.AT TP repetitions(Note 3)Transient power measurementmodeUsed for transmitter transient power measurements. The commandswitches the transmitter ON and OFF. During ON state (pseudo)random bit pattern is send. Repetitions is the number of performedmeasurements, acceptable range is 1 255.3. This command is available only in AX SFEU 1 03 and later.www.onsemi.com15

AX SFEU, AX SFEU APITable 11. REGISTERSNumberNameDefaultRangeUnits300Out Of Band PeriodAX SFEU sends periodic staticmessages to indicate that they arealive. Set to 0 to disable.Description240 24hours302Power LevelThe output power of the radio.Note: This setting is used for all TXmodes except AT CW.140 14dBm410Encryption KeyConfigurationSet to zero for normal operation. Setto one for use with the SIGFOXNetwork Emulator Kit (SNEK)00 10: private key1: public key411(Note 4)Enable Test Credentialsfor Sigfox CertificationSet to zero for use of regular deviceID and key.Setting to one switches to testcredentials for Sigfox Certification(Sigfox ID 0xFEDCBA98.Key 0x0123456789ABCDEF0123456789ABCDEF)00 10: regular ID and key1: test credentials forSigfox certification500(Note 4)RSSI OffsetRSSI offset value can be applied tofune tune the RSSI level that thedeice reports0 128 127dB4. This register is only available only in AX SFEU 1 03 and later.www.onsemi.com16

AX SFEU, AX SFEU APIAPPLICATION INFORMATIONTypical Application DiagramsTypical AX SFEU / AX SFEU API Application DiagramFigure 5. Typical Application DiagramFor detailed application configuration and BOM see theAX SFEU Application Note: Sigfox Compliant ReferenceDesign.www.onsemi.com17

AX SFEU, AX SFEU APIQFN40 PACKAGE INFORMATIONQFN40 Soldering XTsMINts25 CT25 C to PeakTimeFigure 6. QFN40 Soldering ProfileTable 12.Profile FeaturePb Free ProcessAverage Ramp Up Rate3 C/s max.Preheat PreheatTemperature MinTsMIN150 CTemperature MaxTsMAX200 CTime (TsMIN to TsMAX)ts60 – 180 secTime 25 C to Peak TemperatureT25 C to Peak8 min max.Liquidus TemperatureTL217 CTime over Liquidus TemperaturetL60 – 150 sPeak Temperaturetp260 CTime within 5 C of actual Peak TemperatureTp20 – 40 sReflow PhaseCooling PhaseRamp down rate6 C/s max.5. All temperatures refer to the top side of the package, measured on the package body surface.www.onsemi.com18

AX SFEU, AX SFEU APIQFN40 Recommended Pad Layout1. PCB land and solder masking recommendationsare shown in Figure 7.A Clearance from PCB thermal pad to solder mask opening, 0.0635 mm minimumB Clearance from edge of PCB thermal pad to PCB land, 0.2 mm minimumC Clearance from PCB land edge to solder mask opening to be as tight as possibleto ensure that some solder mask remains between PCB pads.D PCB land length QFN solder pad length 0.1 mmE PCB land width QFN solder pad width 0.1 mmFigure 7. PCB Land and Solder Mask Recommendations3. For the PCB thermal pad, solder paste should beprinted on the PCB by designing a stencil with anarray of smaller openings that sum to 50% of theQFN exposed pad area. Solder paste should beapplied through an array of squares (or circles) asshown in Figure 8.4. The aperture opening for the signal pads should bebetween 50 80% of the QFN pad area as shown inFigure 9.5. Optionally, for better solder paste release, theaperture walls should be trapezoidal and thecorners rounded.6. The fine pitch of the IC leads requires accuratealignment of the stencil and the printed circuitboard. The stencil and printed circuit assemblyshould be aligned to within 1 mil prior toapplication of the solder paste.7. No clean flux is recommended since flux fromunderneath the thermal pad will be difficult toclean if water soluble flux is used.2. Thermal vias should be used on the PCB thermalpad (middle ground pad) to improve thermalconductivity from the device to a copper groundplane area on the reverse side of th

High Performance Narrow band Sigfox RF Transceiver Receiver Carrier frequency 869.525 MHz Data rate 600 bps FSK Sensitivity 126 dBm @ 600 bps, 869.525 MHz, GFSK 0 dBm maximum input power Transmitter Carrier frequency 868.13 MHz Data rate 100 bps PSK High efficiency, high linearity integrated power .

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