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datasheet ax - sigfox ultra - low power, at command controlled, sigfox compliant transceiver ic for up - link and down - link revision 2
www.onsemi.com ax - sigfox/d 2 table of contents 1. overview .................................................................................................................. 4 1.1. circuit description ....................................................................................................... 4 1.2. features .................................................................................................................... 4 1.3. applications ............................................................................................................... 5 2. block diagram .......................................................................................................... 6 3. pin function descriptions ......................................................................................... 7 3.1. pinout drawing ........................................................................................................... 9 4. specifications ......................................................................................................... 10 4.1. absolute maximum ratings ......................................................................................... 10 4.2. dc characteristics ..................................................................................................... 11 supplies .................................................................................................................... 11 typical current waveform ........................................................................................... 12 battery life examples ................................................................................................. 13 logic ........................................................................................................................ 14 4.3. ac characteristics ...................................................................................................... 14 tcxo reference input ................................................................................................ 14 transmitter ............................................................................................................... 15 receiver .................................................................................................................... 16 adc / temperature sensor .......................................................................................... 16 5. command interface ............................................................................................... 17 5.1. serial parameters: 9600,8,n,1 .................................................................................... 17 5.2. power modes ............................................................................................................. 17 standby .................................................................................................................... 17 sleep ........................................................................................................................ 17 deep sleep ................................................................................................................ 17 5.3. at commands ........................................................................................................... 18 numerical syntax ....................................................................................................... 18 command syntax ....................................................................................................... 18
table of contents www.onsemi.com ax - sigfox/d 3 return codes ............................................................................................................. 18 examples .................................................................................................................. 18 co mmands ................................................................................................................ 19 registers ................................................................................................................... 24 6. application information ......................................................................................... 25 6.1. typica l application diagrams ....................................................................................... 25 typical sigfox application diagram ............................................................................... 25 7. qfn40 package information .................................................................................. 26 7.1. package outline qfn40 5x7mm ................................................................................... 26 7.2. qfn40 soldering profile .............................................................................................. 27 7.3. qfn40 recommended pad l ayout ................................................................................ 28 7.4. assembly process ...................................................................................................... 28 stencil design & solder paste application ...................................................................... 28 8 . device versions ...................................................................................................... 30
table of contents www.onsemi.com ax - sigfox/d 4 1. overview 1.1. circuit description ax - sigfox is an ultra - low power single chip solution for a node on the sigfox network with both up - and down - link fun ctionality. the ax - sigfox chip is delivered fully ready for operation and contains all the necessary firmware to transmit and receive data from the sigfox network in europe. it connects to the customer product using a logic level rs232 uart. at commands are used to send frames and configure radio parameters. 1.2. features functionality and ecosystem ? sigfox up - link and down - link functionality controlled by at commands ? the ax - sigfox ic is part of a whole development and produ ct ecosystem available from axsem for any sigfox requirement. other parts of the ecosystem include o ready to go ax - sigfox development kit with fully functional ax - sigfox module including sigfox subscription o sigfox ready certified reference design for the ax - sigfox ic o piox by axsem sigfox modules with sma connector or chip antenna o ax - sigfox - api ic for customers wishing to write their own application software based on the axsem sigfox library general features ? qfn40 4mm x 5mm package ? supply range 1.8v - 3.6v ? - 40c to 85c ? temperature sensor ? supply voltage measurements ? 10 gpio pins o 4 gpio pins with selectable voltage measure functionality, differential (1v or 10v range) or single ended (1v range) with 10 bit resolution o 2 gpio pins with selectable sigma delta dac output functionality o 2 gpio pins with selectable output clock o 3 gpio pins selectable as spi master interface o integrated rx/tx switching with differential antenna pins power consumption ? ultra - low power consumption: o charge required to send a sigfox oob pack et at 14dbm output power: 0.28 c o deepsleep mode current: 100 na o sleep mode current: 1.3 a o standby mode current: 0.5 ma o continuous radio rx - mode at 869.525 mhz : 10 ma o continuous radio tx - mode at 868.130 mhz 19 ma @ 0 dbm 49 ma @ 14 dbm high perfor mance narrow - band sigfox rf transceiver ? receiver o carrier frequency 869.525 mhz o data - rate 600 bps o sensitivity - 126 dbm @ 600bps, 869.525mhz, gfsk o 0 dbm maximum input power ? transmitter o carrier frequency 868.13 mhz o data - rate 100 bps o high efficiency, high linearity integrated power amplifier o maximum output power 14 dbm o power level programmable in 1dbm steps
overview www.onsemi.com ax - sigfox/d 5 1.3. applications sigfox networks up - link and down - link. sigfox and sigfox ready are registered trademarks of sigfox sarl.
block diagram www.onsemi.com ax - sigfox/d 6 2. block diagram rx/tx switch and antenna interface transmit communication controlle r cpu program memory (flash) sigfox application ram power mode control adc gpio uart rf synthesis dac ax-sigfox tcxo interface receive clkp clkn antp antn uartrx uarttx gpio[9:0] vdd_io vdd_ana gnd dedicated status outputs radio_led cpu_led tx_led rx_led vtcxo reset_n figure 1 functional block diagram of the ax - sigfox
pin function descriptions www.onsemi.com ax - sigfox/d 7 3. pin function descriptions symbol pin(s) type description v dd_ana 1 p analog power output, decouple to neighboring gnd gnd 2 p ground, decouple to neighboring vdd_ana antp 3 a differential antenna input/output antn 4 a differential antenna input/output nc 5 n do not connect gnd 6 p ground, decouple to neighbo ring vdd_ana vdd_ana 7 p analog power output, decouple to neighboring gnd gnd 8 p ground filt 9 a synthesizer filter nc 10 a must be connected to pin 11 nc 11 a must be connected to pin 10 nc 12 n do not connect gpio8 13 i/o/pu general purpose io g pio7 14 i/o/pu general purpose io, selectable spi functionality (miso) gpio6 15 i/o/pu general purpose io, selectable spi functionality (mosi) gpio5 16 i/o/pu general purpose io, selectable spi functionality (sck) gpio4 17 i/o/pu general purpose io, sel ectable ? dac functionality, selectable clock functionality cpu_led 18 o cpu activity indicator radio_led 19 o radio activity indicator vtcxo 20 o tcxo power gpio9 21 i/o/pu general purpose io, wakeup from deep sleep uarttx 22 o uart transmit uartrx 23 i/pu uart receive rx_led 24 o receive activity indicator tx_led 25 o transmit activity indicator nc 26 pd do not connect reset_n 27 i/pu optional reset pin internal pull - up resistor is permanently enabled, nevertheless it is recommended to connect this pin to vdd_io if it is not used. gnd 28 p ground vdd_io 29 p unregulated power supply gpio0 30 i/o/a/pu general purpose io, selectable adc functionality, selectable ? dac functionality, selectable clock functionality gpio1 31 i/o/a/pu general purpose io, selectable adc functionality gpio2 32 i/o/a/pu general purpose io, selectable adc functionality nc 33 n do not connect nc 34 n do not connect
pin function descriptions www.onsemi.com ax - sigfox/d 8 symbol pin(s) type description gpio3 35 i/o/a/pu general purpose io, selectable adc functionality vdd_io 36 p unregulated power supply nc 37 n connect to ground nc 38 n connect to ground clkn 39 a tcxo interface clkp 40 a tcxo interface gnd center pad p ground on center pad of qfn, must be connecte d a = analog signal i/o = digital input/output signal i = digital input signal n = not to be connected o = digital output signal p = power or ground pu = pull - up pd = pull - down all digital inputs are schmitt trigger inputs, digital input and output levels are lvcmos/lvttl compatible. pins gpio[3:0] must not be driven above vdd_io, all other digital inputs are 5v tolerant. all gpio pins and uartrx start up as input with pull - up. pin possible gpio modes gpio0 0,1,z,u,a,t gpio1 0,1,z,u,a gp io2 0,1,z,u,a gpio3 0,1,z,u,a gpio4 0,1,z,u,t gpio5 0,1,z,u gpio0 0,1,z,u gpio1 0,1,z,u gpio2 0,1,z,u gpio3 0,1,z,u 0 = pin drives 1 = not to be connected z = pin is high impedance input u = pin is input with pull - up a = pin is analog in put t = pin is driven by clock or dac
pin function descriptions www.onsemi.com ax - sigfox/d 9 3.1. pinout drawing gpio9 ax-sigfox qfn40 8 7 6 5 4 3 2 1 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 40 39 38 37 36 35 34 33 32 31 30 29 vdd_ana antp gnd antn nc gnd gnd vdd_ana nc nc nc nc gpio8 gpio7 gpio6 gpio5 gpio4 tx_led vtcxo clk16p clk16n nc nc vdd_io gpio3 nc nc gpio2 gpio1 gpio0 vdd_io gnd reset_n nc txled rxled uartrx uarttx cpu_led figure 2 pinout drawing (top view)
specifications www.onsemi.com ax - sigfox/d 10 4. specifications 4.1. absolute maximum ratings stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. exposure to absolute maximum rating co nditions for extended periods may affect device reliability. symbol description condition min max unit vdd_io supply voltage - 0.5 5.5 v idd supply current 200 ma p tot total power consumption 800 mw p i absolute maximum input power at receiver input antp and antn pins in rx mode 10 dbm i i1 dc current into any pin except antp, antn - 10 10 ma i i2 dc current into pins antp, antn - 100 100 ma i o output current 40 ma v ia input voltage antp, antn pins - 0.5 5.5 v input voltage digital pins - 0.5 5.5 v v es electrostatic handling hbm - 2000 2000 v t amb operating temperature - 40 85 c t stg storage temperature - 65 150 c t j junction temperature 150 c
specifications www.onsemi.com ax - sigfox/d 11 4.2. dc characteristics supplies sym description condition min typ max unit conditions for all current and energy values unless otherwise specified are for the hardware configuration described in the ax - sigfox application note: sigfox compliant reference design. t amb operational ambient temperature - 40 27 85 c vdd io i/o and voltage regulator sup ply voltage 1.8 3.0 3.6 v vdd io_r1 i/o voltage ramp for reset activation; note 1 ramp starts at vdd_io0.1v 0.1 v/ms vdd io_r2 i/o voltage ramp for reset activation; note 1 ramp starts at 0.1v specifications www.onsemi.com ax - sigfox/d 12 typical current waveform figure 3 typical current waveform for a maximum length frame with downlink receive at 14 dbm output power
specifications www.onsemi.com ax - sigfox/d 13 battery life examples scenario 1: ? cr 2032 coin cell battery ? one oob frame transmitter per day at pout=0 dbm ? device in sleep ? neglecting battery self discharge cr2032 capacity 225 mah * 3600 s/h 810 c sleep charge per day 1.3 a * 86400s 0.11 c/day oob frame transmission 0.12 c/day total charge consumption 0.23 c/day battery life 9.6 years scenario 2: ? 2 aaa alkaline batteries in series ? one oob frame transmitter per day at pout=14 dbm ? four maximum length frames with downlink receive per day at pout=14 dbm ? device in sleep ? neglecting battery self discharge 2 aaa alkaline capacity 1500 mah * 3600 s/h 5400 c sleep charge per day 1.3 a * 86400s 0.11 c/day oob frame transmission 0.28 c/day frame transmission with downl ink 4 * 0.46 c/day 1.84 c/day total charge consumption 2.26 c/day battery life 6.5 years
specifications www.onsemi.com ax - sigfox/d 14 logic symbol description condition min typ max unit digital inputs v t+ schmitt trigger low to high threshold point vdd_io = 3.3v 1.55 v v t - schmitt trigger high to low threshold point 1.25 v v il input voltage, low 0.8 v v ih input voltage, high 2.0 v v ipa input voltage range, gpio[3:0] - 0.5 vdd_io v v ipbc input voltage range, gpio[9:4], uartrx - 0.5 5.5 v i l input leakage current - 10 10 a r pu programmable pull - up resistance 65 k ? digital outputs i oh output current, high p orts gpio[9:0], uarttx, txled, rxled, txled, cpuled v oh = 2.4v 8 ma i ol output current, low gpio[9:0], uarttx, txled, rxled, txled, cpuled v ol = 0.4v 8 ma i oz tri - state output leakage current - 10 10 a 4.3. ac characteristics tcxo reference input symbol description condition min typ max unit f tcxo tcxo frequency a passive network between the tcxo output and the pins clkp and clkn is required. for detailed tcxo network recommendations depending on the tcxo output swing refer to the ax5043 application note: use with a tcxo reference clock. for tcxo recommendations see the ax - sigfox application note: sigfox compliant reference design 48 mhz
specifications www.onsemi.com ax - sigfox/d 15 transmitter sym bol description condition min typ max unit conditions for transmitter specifications unless otherwise specified with the antenna network from ax - sigfox application note: sigfox compliant reference design and at 868.130 mhz. sbr signal bit rate 100 bps ptx min lowest transmitter output power at$cw=868130000,1,0 0 dbm ptx max highest transmitter output power at$cw=868130000,1,14 14 ptx step programming step size output power 1 db dtx temp transmitter power variation vs. temperature - 40 c to +85 c +/ - 0.5 db dtx vdd transmitter power variation vs. vdd_io 1.8 to 3.6 v +/ - 0.5 db ptx harm2 emission @ 2 nd harmonic - 51 dbc ptx harm3 emission @ 3 rd harmonic - 63 ptx harm4 emission @ 4 th harmonic - 84 figure 4 typical spectrum with harmonics at 14 dbm output power
specifications www.onsemi.com ax - sigfox/d 16 receiver sym description condition min typ max unit conditions for transmitter specifications unless otherwise specified with the antenna network from ax - sigfox application note: sigfox compliant reference design and at 869.525 mhz. sbr signal bit rate 600 bps is ber868 at$sb=x,1, at$sf=x,1, at$sr per < 0.1 - 126 dbm blk 868 blocking at +/ - 10mhz offset channel/blocker @ per = 0.1, wanted signal level is +3 db above the typical sensitivity, the blocker signal is cw 78 db adc / temperature sensor symbol description condition min typ max unit adcres adc resolution 10 bits v adcref adc reference voltage 0.95 1 1.05 v z adc00 input capacitance 2.5 pf dnl differential nonlinearity +/ - 1 lsb inl integral non inearity +/ - 1 lsb off offset 3 lsb gain_err gain error 0.8 % adc in differential mode v abs_diff absolute voltages & common mode voltage in differential mode at each input 0 vdd_io v v fs_diff01 full swing input for differential signals gain x1 - 500 500 mv v fs_diff10 gain x10 - 50 50 mv adc in single ended mode v mid_se mid code input voltage in single ended mode 0.5 v v in_se00 input voltage in single ended mode 0 vdd_io v v fs_se01 full swing input for single ended signals gain x1 0 1 v temperature sensor t rng temperature range at$t? - 40 85 c t err_cal temperature error at$t? - 2 +2 c
command interface www.onsemi.com ax - sigfox/d 17 5. command interface 5.1. serial parameters: 9600,8,n,1 the ax - sigfox uses the uar t (pins uarttx, uartrx) to communicate with a host and uses a bitrate of 9600 baud , no parity, 8 data bits and one stop bit. 5.2. power modes standby after power - up and after finishing a sigfox transmission, ax - sigfox enters standby mode. in standby mode, ax - sigfox listens on the uart for commands from the host. also, oob frames are transmitted whenever the oob timer fires. to conserve power, the ax - sigfox can be put into sleep or turned off (deep sleep) completely. sleep the command at$p=1 is used to put the ax - sigfox into sleep mode . in this mode, only the wakeup timer for out - of - band messages is still r unning. to wake the ax - sigfox up from sleep mode toggle the serial uart rx pin, e.g. by sending a break (break is an rs232 framing violation, i.e. at least 10 bit durations low) . when an out of band (oob) message is du e, ax - sigfox a utomatically wakes up to transmit the message, and then returns to sleep mode. deep sleep in deep sleep mode , the ax - sigfox is completely turned off and only draws negligible leakage current. deep sleep mode can be activated with at$p=2. to wake - up from deep sleep mode, gpio9 is pulled to gnd.
command interface www.onsemi.com ax - sigfox/d 18 when using deep sleep mode , keep two things in mind: everything is turned off, timers are not running at all and all settings will be lost (use at$wr to save settings to flash before entering deep sleep mode ). out - of - band messages will therefore not be sent. the pins states are frozen in deep sleep mode . the user must ensure that this will not result in condition which would dra w a lot of current. 5.3. at commands numeric al syntax hexdigit ::= [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 | binnum uint_opt ::= uint | optnum command syntax a command starts with ?at? (everything is case sensitive!), continues with the actual command followed by parameters (if any) and ends with any kind of whitespace (space , tab, newline etc.) if incorrect syntax is detected (?parsing error?) all input is 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 the corresponding prefix (?0x?, ?0?, ?0b?). the only exception is the 'send frame' command ( at$sf ) which expects a list of hexadecimal digits without any prefix. return codes a successful command execution is indicated by sending ?ok?. if a command returns a value (e.g. by querying a register) only the value is returned. examples bold text is sent to ax - sigfox . at$i=0 axsem at command interface here, we execute command ?i? to query some general information. at$sf=aabb1234 ok
command interface www.onsemi.com ax - sigfox/d 19 this sends a sigfox frame containing { 0x 00 : 0x 11 : 0x 22 : 0x 33 : 0x44 } , then waits for a downlink response telegram , which in this example contains { 0xaa : 0xbb : 0xcc : 0xdd } . at$sf=0011223344,1 ok rx=aa bb cc dd this sends a sigfox frame containing { 0xaa : 0xbb : 0x12 : 0x34 } without waiting for a response telegram. at$cb=0xaa,1 ok the ?cb? command sends out a continuous pattern of bits, in this case 0xaa = 0b10101010. at$p=1 ok this transitions the device into sleep mode. out - of - band transmissions will st ill be triggered. the uart is powered down. the device can be woken up by a low level on the uart signal, i.e. by sending break. commands command name description at dummy command just returns 'ok' and does nothing else. can be used to check communication . at$sb= bit[,bit] send b it send a bit status (0 or 1). optional bit flag indicates if ax - sigfox should receive a downlink frame. at$sf= frame [ , bit ] send f rame send payload data, 1 to 12 bytes. optional bit flag indic ates if ax - sigfox should receive a downlink frame . at$so manually send out of band message send the out - of - band message. ats uint ? get r egister query a specific configuration register?s value. see chapter ?registers? for a list of registers. ats uint = uint set r egister change a configuration register. at$if= uint set tx f requency set the output carrier macro channel for sigfox frames. at$if? get tx f requency get the currently chosen tx frequency. at$dr= uint set rx f r equency set the reception carrier macro channel for sigfox frames. at$dr? get rx frequency get the currently chosen r x frequency.
command interface www.onsemi.com ax - sigfox/d 20 command name description at$cw= uint, bit [,uint_opt] continuous wave to run emission tests for sigfox certification it is necessary to send a contin uous wave, i.e. just the base frequency without any modulation. parameters: name range description default frequency 800000000 ? 999999999, 0 continuous wave frequency in hz. use 868130000 for sigfox or 0 to keep previous frequency. mode 0, 1 enable or disable carrier wave. power 0 - 14 dbm of signal 14 at$cb= uint_opt, bit test mode: tx constant byte for emission testing it is useful to send a specific bit pattern. the first parameter specifies the byte to send. use ? - 1? for a (pseudo - ) random patte rn. parameters: name range description default pattern 0 - 255, - 1 byte to send. use ?- 1? for a (pseudo - ) random pattern mode 0, 1 enable or disable pattern test mode. at$t? get t emperature measure internal temperature and return it in 1/10 th of a deg ree celsius. at$v? get voltages return current voltage and voltage measured during the last transmission in mv .
command interface www.onsemi.com ax - sigfox/d 21 command name description at$i= uint information display various product information: 0: software name & version example response: ax - sigfox 1.0.6 - etsi 1: contact deta ils example response: support@axsem.com 2: silicon revision lower byte example response: 8f 3: silicon revision upper byte example response: 00 4: major firmware version example response: 1 5: minor firmware version example response: 0 6: firmware revisio n example response: 3 7: firmware variant (frequency band etc. (eu/us)) example response: etsi 8: firmware vcs version example response: v1.0.2 - 36 9: sigfox library version example response: dl0 - 1.4 10: device id example response: 00012345 11: pac ex ample response: 0123456789abcdef at$p= uint set p ower m ode to conserve power, the ax - sigfox can be put to sleep manually. depending on power mode, you will be responsible for waking up the ax - sigfox again! 0: software reset (settings will be reset to values in flash) 1: sleep (send a break to wake up) 2: deep sleep (toggle gpio9 or reset _n pin to wake up; the ax - sigfox is not running and al l settings will be reset!) at$wr save c onfig write all settings to flash (rx/tx frequencies, registers) so that they survive reset/deep sleep or loss of power. use at$p=0 to reset the ax - sigfox and load settings fro m flash.
command interface www.onsemi.com ax - sigfox/d 22 command name description at:p n ? get gpio pin return the setting of the gpio p in 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, then the voltage (range 0...1 v) is returned. the mode characters have the following meaning : mode description 0 pin drives low 1 pin drives high z pin is high impedance input u pin is input with pull - up a pin is analog input (gpio pin 0...3 only) t 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:p n =? get gpio p in r ange print a list of possible modes for a pin . the table below lists the response. pin modes p0 0,1,z,u,a,t p1 0,1,z,u,a p2 0,1,z,u,a p3 0,1,z,u ,a p4 0,1,z,u,t p5 0,1,z,u p6 0,1,z,u p7 0,1,z,u p8 0,1,z,u p9 0,1,z,u at:p n = mode set gpio p in set the gpio pin mode . for a list of the modes see the command at:p n ? at:adc p n [ - p n [ (1v|10v)]]? get gpio p in a nalog voltage measure the voltage applie d to a gpio pin. the command also allows measurement of the voltage difference across two gpio pins. in differential mode, the full scale range may also be specified as 1 v or 10 v. note however that the pin input voltages must not exceed the range 0..vdd _ io . the command returns the result as fraction of the full scale range (1v if none is specified). the gpio pins referenced should be initialized to analog mode before issuing this command.
command interface www.onsemi.com ax - sigfox/d 23 command name description at:spi [(a|b|c|d)] = bytes spi t ransaction this command clocks out by tes on the spi port. the clock frequency is 312.5khz. the command returns the bytes read on miso during output. optionally the clocking mode may be specified (default is a) : mode clock inversion clock phase a normal normal b normal alternate c inverted normal d inverted alternate note 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, reffreq set c lock g enerator output a square wave on the pin(s) set to t mode . the frequency of the square wave is reffreq freq . possible values for reffreq are 20000000, 10000000, 5000000, 2500000, 1250000, 625000, 312500, 156250. possible values if ffreq are 0?65535. at:clk=off turn off clock generator switch off the cl ock generator. at:clk? get c lock g enerator return the settings of the clock generator. two numbers are returned, freq and reffreq. at:dac= value set ? dac output a ? dac value on the pin(s) set to t mode . parameter value may be in the range ? 32768..32767. the average output voltage is vdd value + . a n external low pass filter is needed to get smooth output voltages. the modulation frequen cy is 20 mhz. a possible low pass filter choice is a simple rc low pass filter with r=10k and c=1f at:dac=off turn off ? dac switch off the dac . at:dac? get ? dac return the dac value .
command interface www.onsemi.com ax - sigfox/d 24 registers number name description default range unit 300 out of band period ax - sigfox sends periodic static messages to indicate that they are alive. set to 0 to disable. 24 0 - 24 hours 302 power level the output power of the radio. 14 0 - 14 dbm
application information www.onsemi.com ax - sigfox/d 25 6. application information 6.1. typical application diagrams typical sigfox application diagram figure 5 typical application diagram for detailed application configuration and bom see the ax - sigfox application note: sigfox compliant reference design.
qfn40 package information www.onsemi.com ax - sigfox/d 26 7. qfn40 package information 7.1. package outline qfn40 5x7mm notes 1. ?e? represents the basic terminal pitch 2. datum ?c? is the mounting surface with which the package is in con tact. 3. ?3? specifies the vertical shift of the flat part of each terminal from the mounting surface. 4. dimension ?a? includes package warpage. 5. dimension ?b? applies to the metallised terminal and is measured between 0.15 to 0.30 mm from the terminal tip. if t he terminal has the optional radius on the other end of the terminal, the dimension ?b? should not be measured in the radius are 6. package dimension take reference from jedec mo - 220 7. rohs
qfn40 package information www.onsemi.com ax - sigfox/d 2 7 7.2. qfn40 soldering profile profile feature pb - free process average ramp - up rate 3 c/sec max. preheat preheat temperature min t smin 150c temperature max t smax 200c time (t smin to t smax ) t s 60 ? 180 sec time 25c to peak temperature t 25 to peak 8 min max. reflow phase liquidus temperature t l 217c time over liquidus temperature t l 60 ? 150 sec peak temperature t p 260c time within 5c of actual peak temperature t p 20 ? 40 sec cooling phase ramp - down rate 6c/sec max. notes: all temperatures refer to the top side of the package, measured on the package body surface. time t p t l t smax t smin t 25 t o peak t s t l 25c preheat reflow cooling t p temperature
qfn40 package information www.onsemi.com ax - sigfox/d 28 7.3. qfn40 recommended pad layout 1. pcb land and solder masking recommendations are shown in figure 6 . a = clearance from pcb thermal pad to solder mask opening, 0.0635 mm minimum b = clearance from edge of pcb thermal pad to pcb land, 0.2 mm minimum c = clearance from pcb land edge to solder mask opening to be as tight as possible to ensure that some s older mask remains between pcb pads d = pcb land length = qfn solder pad length + 0.1mm e = pcb land width = qfn solder pad width + 0.1 mm figure 6 pcb land and solder mask recommendations 2. thermal vias should be used on the pcb thermal pad (middle ground pad) to improve thermal conductivity from the device to a copper ground plane area on the reverse side of the printed circuit board. the number of vias depends on the package thermal requirements, as determined by thermal simulation or actual testing. 3. incr easing the number of vias through the printed circuit board will improve the thermal conductivity to the reverse side ground plane and external heat sink. in general, adding more metal through the pc board under the ic will improve operational heat transfe r, but will require careful attention to uniform heating of the board during assembly. 7.4. assembly process stencil design & solder paste application 1. stainless steel stencils are recommended for solder paste application. 2. a stencil thickness of 0.125 ? 0.150 m m (5 ? 6 mils) is recommended for screening. 3. for the pcb thermal pad, solder paste should be printed on the pcb by designing a stencil with an array of smaller openings that sum to 50% of the qfn exposed pad area. solder paste should be applied through a n array of squares (or circles) as shown in figure 7 . 4. the aperture opening for the signal pads should be between 50 - 80% of the qfn pad area as shown in figure 8 . 5. optionally, for better solder paste rele ase, the aperture walls should be trapezoidal and the corners rounded. 6. the fine pitch of the ic leads requires accurate alignment of the stencil and the printed circuit board. the stencil and printed circuit assembly should be aligned to within + 1 mil pr ior to application of the solder paste. 7. no - clean flux is recommended since flux from underneath the thermal pad will be difficult to clean if water - soluble flux is used.
qfn40 package information www.onsemi.com ax - sigfox/d 29 figure 7 solder paste application on exposed pad minimum 50% coverage 62% coverage maximum 80% coverage figure 8 solder paste application on pins
device versions www.onsemi.com ax - sigfox/d 30 8. device versions version device marking at$i=0 at$i=2 at$i=3 1 ax - sigfox - 1 or ax8052f143 - 2 ax - sigfox 1.0.6 - etsi 0x8f 0x51 on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc) or its subsid iaries in the united states and/or other countries. scillc owns the rights to a number of patents, trademarks, copyrights, trad e secrets, and other intellectual property. a listing of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent - marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc makes n o warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liabi lity, including without limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. s cillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or author ized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in wh ich the failure of the scillc product could create a situation where personal in jury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, bu yer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all cl aims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such u nintended or unauthorized use, even if such claim alleges that scillc was negligent regardi ng the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subj ect to all applicable copyright laws and is not for resale in any manner. p ublication ordering information literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 - 675- 2175 or 800 - 344 - 3860 toll free usa/canada fax: 303 - 675 - 2176 or 800 - 344 - 3867 toll free usa/canada email : orderlit@onsemi.com n. american t echnical support : 800 - 282 - 9855 toll free usa/canada. europe, m iddle east and africa technical support : phone: 421 33 790 2910 japan customer focus center phone: 81 - 3 - 5817 - 1050 on semiconductor website : www.onsemi .com order literature : http://www.onsemi.com/orderlit for additional i nformation, please contact your local sales representative

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