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? semiconductor components industries, llc, 2016 april, 2016 ? rev. 3 1 publication order number: ax ? sigfox ? mods/d ax-sigfox ministamp ax-sigfox antstamp ultra-low power, at command controlled, sigfox compliant modules overview the ax ? sigfox modules are ultra ? low power module solutions for a node on the sigfox network with both up ? and down ? link functionality. the ax ? sigfox modules connect to the customer application using a logic level rs232 uart. at commands are used to send frames and configure radio parameters. the ax ? sigfox module comes in two flavors ? ax ? sigfox ministamp with 50 antenna port ? ax ? sigfox antstamp with on ? board ? 5 dbi chip antenna functionality and ecosystem ? sigfox up ? link and down ? link functionality controlled by at commands ? the ax ? sigfox modules are part of a whole development and product ecosystem available from on semiconductor for any sigfox requirement. other parts of the ecosystem include ? ax ? sigfox ultra ? low power, at command controlled, sigfox compliant transceiver ic ? ready to go ax ? sigfox development kit with fully functional ax ? sigfox module including sigfox subscription ? sigfox ready certified reference design for the ax ? sigfox ic ? ax ? sigfox api ic for customers wishing to write their own application software based on the on semiconductor sigfox library general features ? 18.2 x 22 x 3 mm 3 without chip antenna, 18.2 x 39.7 x 3 mm 3 with chip antenna ? supply range from 1.8 v to 3.3 v ? ? 40 c to 85 c ? temperature sensor ? supply voltage measurements ? 10 gpio pins ? 4 gpio pins with selectable voltage measure functionality, differential (1 v or 10 v range) or single ended (1 v range) with 10 bit resolution ? 2 gpio pins with selectable sigma delta dac output functionality ? 2 gpio pins with selectable output clock ? 3 gpio pins selectable as spi master interface power consumption ? ultra ? low power consumption ? charge required to send a sigfox oob packet at 14 dbm output power: 0.29 c ? deepsleep mode current: 500 na ? sleep mode current: 1.6 a ? standby mode current : 0.5 ma ? continuous radio reception at 869.525 mhz: 13 ma ? continuous radio transmission at 868.130 mhz for 14 dbm output power: 51 ma for 0 dbm output power: 21 ma ? the output power of ax ? sigfox modules can be programmed in 1 db steps from 0 dbm ? 14 dbm. they are optimized for best power efficiency at 14 dbm output power. for modules optimized for other output power values e.g 0 dbm transmission with 10 ma please contact us. high performance narrow ? band sigfox receiver ? carrier frequency 868.525 mhz ? data ? rate 600 bps ? sensitivity: ? 126 dbm @ 600 bps, 869.525 mhz, gfsk ? 0 dbm maximum input power highly efficient transmitter ? carrier frequency 868.13 mhz ? data ? rate 100 bps psk ? maximum output power 14 dbm ? power level programmable in 1 dbm steps from 0 dbm to 14 dbm regulatory ? sigfox ready certified ? en 300 220 www.onsemi.com
ax ? sigfox ? mods www.onsemi.com 2 about the sigfox technology sigfox uses an ultra narrow band (unb) based radio technology to connect devices to its global network. the usage of unb is key to providing a scalable, high ? capacity network, with very low energy consumption, while maintaining a simple and easy to rollout star ? based cell infrastructure. the network operates in the globally available ism bands (license ? free frequency bands) and co ? exists in these frequencies with other radio technologies, but without any risk of collisions or capacity problems. sigfox currently uses the most popular european ism band on 868 mhz (as defined by etsi and cept) as well as 902 mhz in the usa (as defined by the fcc), depending on specific regional regulations. sigfox only acts as a transport channel, pushing the data towards the customer?s it system. an important advantage provided by the use of the narrow band technology is the flexibility it offers in terms of antenna design. on the network infrastructure end it allows the use of small and simple antennas, but more importantly, it allows devices to use inexpensive and easily customizable antennas. the sigfox protocol is compatible with existing transceivers and is actively being ported to a growing number of platforms. figure 1. ax ? sigfox ministamp/antstamp modules (note that the actual product comes with a metal cap)
ax ? sigfox ? mods www.onsemi.com 3 pinout figure 2. pinout drawings (top view) 1 8 25 18 9 17 34 26 25 18 9 17 34 26 ministamp antstamp table 1. pin function description pin name function 1* gnd ground 2* nc do not connect 3* nc 4* nc 5* gnd ground 6* ant50 50 antenna port 7* gnd ground 8* nc do not connect 9 nc 10 gpio8 general purpose io 11 gpio7 general purpose io, selectable spi functionality (miso) 12 gpio6 general purpose io, selectable spi functionality (mosi) 13 gpio5 general purpose io, selectable spi functionality (sck) 14 gpio4 general purpose io, selectable dac functionality, selectable clock functionality 15 cpu_led module activity status, enabled whenever the module is running 16 radio_led radio activity status 17 vtcxo tcxo enable (used to control the on ? board tcxo) 18 gpio9 general purpose io and wake ? up from deepsleep 19 uart_tx uart used to communicate with the module at a bitrate of 9600 baud, no parity, 8 data bits and one stop bit. 20 uart_rx 21 rx_led radio receive activity status 22 tx_led radio transmit activity status 23 nc do not connect 24 nc 25 vdd power supply 26 gnd ground 27 reset_n optional reset (active low). do not connect the pin if not used. 28 gnd ground 29 gpio0 general purpose io, selectable adc functionality, selectable dac functionality, selectable clock functionality 30 gpio1 general purpose io, selectable adc functionality
ax ? sigfox ? mods www.onsemi.com 4 table 1. pin function description pin function name 31 gpio2 general purpose io, selectable adc functionality 32 nc do not connect 33 nc 34 gpio3 general purpose io, selectable adc functionality note: all digital pins are schmitt trigger inputs, digital input and output levels are lvcmos/lvttl compatible. pins gpio[3:0] must not be driven above vdd, all other digital inputs are 5 v tolerant. all gpio pins and uart_rx start ? up as inputs with pull ? up. dimensions figure 3. dimensions (mm) 4.8 22 1.8 18.2 11 39.7 1.8 18.2 11 3.8 3.8 2.7 2.9 1.3 1.3 4.8 22 1.8 pin 1 3.8 17.7 2.7 2.9 39.7 1.8 1.2 x 1.9 no copper in this area 3.8 all dimensions in millimeter. 1.2 x 1.9 ministamp antstamp the area under the modules must be covered in solder stop. to guarantee good antenna performance with the ax ? sigfox antstamp , the left part of the module must remain free from any copper (i.e. no ground plane and no traces).
ax ? sigfox ? mods www.onsemi.com 5 specifications table 2. supplies symbol description condition min typ max units t amb operational ambient temperature ? 40 27 85 c vdd supply voltage 1.8 3.0 3.3 v i ds deep sleep mode current at$p=2 500 na i slp sleep mode current at$p=1 1.6 a i stdby standby mode current 0.5 ma continuous receive i rx_cont current consumption in sigfox rx test mode at$sr=1,1, ? 1 12.8 ma transmit at 14 dbm output power / receive (note 2) i txmodavg_14 modulated transmitter current 51.0 ma q sfx_oob_14 charge to send a sigfox out of band message at$s0 0.28 c q sfx_oob_14 charge to send a bit at$sb=0 0.19 c q sfx_oob_14 charge to send a bit with downlink receive message at$sb=0,1 0.33 c q sfx_lfr_14 charge to send the longest possible sigfox frame (12 byte) at$sf=00112233445566778899aabb 0.37 c q sfx_lfr_14 charge to send the longest possible sigfox frame (12 byte) with downlink receive at$sf=00112233445566778899aabb,1 0.46 c transmit at 0 dbm output power / receive (notes 1 and 2) i txmodavg_14 modulated transmitter current 21.0 ma q sfx_oob_0 charge to send a sigfox out of band message at$s0 0.12 c q sfx_oob_0 charge to send a bit at$sb=0 0.08 c q sfx_oob_0 charge to send a bit with downlink receive message at$sb=0,1 0.14 c q sfx_lfr_0 charge to send the longest possible sigfox frame (12 byte) at$sf=00112233445566778899aabb 0.27 c q sfx_lfr_0 charge to send the longest possible sigfox frame (12 byte) with downlink receive at$sf=00112233445566778899aabb,1 0.29 c 1. the output power of ax ? sigfox modules can be programmed in 1 db steps from 0 dbm ? 14 dbm. they are optimized for best power efficiency at 14 dbm output power. for modules optimized for other output power values e.g. 0 dbm transmission with 10 ma please contact us. 2. antenna gain not included.
ax ? sigfox ? mods www.onsemi.com 6 typical current waveform figure 4. typical current waveform for a maximum length frame with downlink receive at 14 dbm output power typical current waveform ? maximum length frame with downlink receive, pout = 14 dbm time [s] 20 10 30 40 0 10 0 20 30 40 50 60 current [ma] battery life calculation example scenario for example calculation: ? 2 aaa alkaline batteries in series ? one oob frame transmission per day at 14 dbm output power ? four maximum length frames with downlink receive per day at 14 dbm output power ? device in sleep mode when no other activity ? neglecting battery self discharge 2 aaa alkaline capacity 1500 mah * 3600 s/h 5400 c sleep charge per day 1.6 a * 86400 s 0.14 c/day oob frame transmission 0.28 c/day frame transmission with downlink 4 * 0.46 c/day 1.84 c/day total charge consumption 2.26 c/day battery life 6.5 years
ax ? sigfox ? mods www.onsemi.com 7 table 3. logic symbol description condition min typ max units digital inputs v t+ schmitt trigger low to high threshold point vdd = 3.3 v 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 v v ipbc input voltage range, gpio[9:4], uart_rx, reset_n ? 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 ports gpio[9:0], uart_tx, tx_led, rx_led, cpu_led, radio_led v oh = 2.4 v 8 ma i ol output current, low gpio[9:0], uarttx, txled, rxled, txled, cpuled v ol = 0.4 v 8 ma i oz tri ? state output leakage current ? 10 10 a table 4. transmitter symbol description condition min typ max units sbr signal bit rate 100 bps f carrier carrier frequency 868.13 mhz ptx min lowest transmitter output power at$cw=868130000,1,0 0 dbm ptx max highest transmitter output power at$cw=868130000,1,14 (note 1) 14 dbm ptx step programming step size output power 1 db dtx temp transmitter power variation vs. temperature ? 40 c to +85 c 0.5 db dtx vdd transmitter power variation vs. vdd 1.8 to 3.3 v 0.5 db ptx harm2 emission @ 2 nd harmonic ? 51 dbc ptx harm3 emission @ 3 rd harmonic ? 63 ptx harm4 emission @ 4 th harmonic ? 84 1. antenna gain not included. table 5. receiver symbol description condition min typ max units sbr signal bit rate 600 bps f carrier carrier frequency 869.525 mhz is sensitivity at$sb=x,1, at$sf=x,1, at$sr per < 0.1 ? 126 dbm blk blocking at 10 mhz offset wanted signal is 3 db above the typical sensitivity limit (per = 0.1) and the blocker is a continuous wave 78 db
ax ? sigfox ? mods www.onsemi.com 8 table 6. adc / temperature sensor symbol description condition min typ max units adcres adc resolution 10 bit 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 nonlinearity 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 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 v v fs_se01 full swing input for single ended signals gain x1 0 1 v temperature sensor t rng temperature range ? 40 85 c t err_cal temperature error 2 c
ax ? sigfox ? mods www.onsemi.com 9 command interface serial parameters: 9600, 8, n, 1 the ax ? sigfox modules use the uart (pins uart_tx, uart_rx) to communicate with a host and use a bitrate of 9600 baud, no parity, 8 data bits and one stop bit. power modes state diagram standby mode after power ? up and after finishing a sigfox transmission, the ax ? sigfox modules enter standby mode. in standby mode, ax ? sigfox modules listen on the uart for commands from the host. also, oob frames are transmitted whenever the oob timer fires. to conserve power, the ax ? sigfox modules can be put into sleep mode or turned off (deep sleep mode) completely. sleep mode the command at$p=1 is used to put the ax ? sigfox modules into sleep mode. in this mode, only the wakeup timer for out ? of ? band messages is still running. to wake up the ax ? sigfox module from sleep mode, toggle the uart_rx pin, e.g. by sending a break (break is an rs232 framing violation, i.e. at least 10 bit durations low). when an out of band (oob) message is due, ax ? sigfox modules automatically wake up to transmit the message, and then return to sleep mode. it is strongly recommended to put ax ? sigfox modules into sleep mode when they are not being used. deep sleep mode in deep sleep mode, the ax ? sigfox modules are completely turned off. deep sleep mode can be activated with the command at$p=2 . to wake ? up from deep sleep mode the pin gpio9 is pulled to gnd. when using deep sleep mode, two things should be kept in mind: everything is turned off, timers are not running at all and all settings are lost (use at$wr to save settings to flash before entering deep sleep mode). out ? of ? band messages will therefore not be sent. the pins states are frozen in deep sleep mode. the user must ensure that this will not result in conditions at the module boundary that draw a lot of current. at commands numerical syntax hexdigit ::= [0 ? 9a ? fa ? f] hexnum ::= ?0x? hexdigit+ decnum ::= ?0? | [1 ? 9] [0 ? 9]* octnum ::= ?0? [0 ? 7]+ binnum ::= ?0b? [01]+ bit ::= [01] optnum ::= ? ? 1? frame ::= (hexdigit hexdigit)+ uint ::= hexnum | decnum | octnum | binnum uint_opt ::= uint | optnum command syntax a command starts with ?at? (note that everything is case sensitive!), continues with the actual command followed by parameters (if any) and ends with any kind of whitespace (space, tab, newline etc.) if incorrect syntax is detected (?parsing error?) all input is ignored up until the next whitespace character. also note that any number can be entered in any format (hexadecimal, decimal, octal and binary) by adding the corresponding prefix (?0x?, ?0?, ?0b?). the only exception is the ?send frame? command ( at$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 module. here, we execute command ?i? to query some general information. at$i=0 axsem at command interface this sends a sigfox frame containing { 0xaa : 0xbb : 0x12 : 0x34 } without waiting for a response telegram: at$sf=aabb1234 ok this sends a sigfox frame containing { 0x00 : 0x11 : 0x22 : 0x33 : 0x44 }, then waits for a downlink response telegram, which in this example contains { 0xaa : 0xbb : 0xcc : 0xdd }. at$sf=0011223344,1 ok rx=aa bb cc dd
ax ? sigfox ? mods www.onsemi.com 10 the ?cb? command sends out a continuous pattern of bits, in this case 0xaa = 0b10101010: at$cb=0xaa,1 ok this transitions the device into sleep mode. out ? of ? band transmissions will still be triggered. the uart is powered down. the module can be woken up by a low level on the uart signal, i.e. by sending break. at$p=1 ok table 7. commands command name description at dummy command just returns ?ok? and does nothing else. can be used to check communication. at$sb=bit[,bit] send bit send a bit status (0 or 1). optional bit flag indicates if ax ? sigfox module should receive a downlink frame. at$sf=frame[,bit] send frame send payload data, 1 to 12 bytes. optional bit flag indicates if ax ? sigfox module should receive a downlink frame. at$so manually send out of band message send the out ? of ? band message. atsuint? get register query a specific configuration register?s value. see chapter ?registers? for a list of registers. atsuint=uint set register change a configuration register. at$if=uint set tx frequency set the output carrier macro channel for sigfox frames. at$if? get tx frequency get the currently chosen tx frequency. at$dr=uint set rx frequency set the reception carrier macro channel for sigfox frames. at$cw=uint,bit[,uint_opt] continuous wave to run emission tests for sigfox certification it is necessary to send a continuous wave, i.e. just the base frequency without any modula- tion. parameters: name range description frequency 800000000 ? continuous wave frequency in hz. 999999999, 0 use 868130000 for sigfox or 0 to keep previous frequency. mode 0, 1 enable or disable carrier wave. power 0 ? 14 dbm of signal | default: 14 at$cb=uint_opt,bit test mode: tx constant byte for emission testing it is useful to send a specific bit pattern. the first parameter specifies the byte to send. use ? ? 1? for a (pseudo ? )random pattern. parameters: name range decsription pattern 0 ? 255, ? 1 byte to send. use ? ? 1? for a (pseudo ? )random pattern. mode 0, 1 enable or disable pattern test mode. at$t? get temperature measure internal temperature and return it in 1/10 th of a degree celsius. at$v? get voltages return current voltage and voltage measured during the last transmission in mv.
ax ? sigfox ? mods www.onsemi.com 11 table 7. commands command description name at$i=uint information display various product information: 0: software name & version example response: ax ? sigfox 1.0.6 ? etsi 1: contact details 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 revision 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 example response: 0123456789abcdef at$p=uint set power mode to conserve power, the ax ? sigfox module can be put to sleep manually. depending on power mode, you will be responsible for waking up the ax ? sigfox module again! 0: software reset (settings will be reset to values in flash) 1: sleep (send a break to wake up) 2: deep sleep (toggle gpio9 or reset_n pin to wake up; the ax ? sigfox module is not running and all settings will be reset!) at$wr save config 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 module and load settings from flash. at:pn? get gpio pin return 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, fol- lowed 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:pn=? get gpio pin range 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
ax ? sigfox ? mods www.onsemi.com 12 table 7. commands command description name at:pn=mode set gpio pin set the gpio pin mode. for a list of the modes see the command at:pn? at:adc pn[ ? pn[(1v|10v)]]? get gpio pin analog voltage measure the voltage applied 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. the command returns the result as fraction of the full scale range (1 v if none is specified). the gpio pins referenced should be initialized to analog mode before issuing this command. at:spi[(a|b|c|d)]=bytes spi transaction this command clocks out bytes on the spi port. the clock frequency is 312.5 khz. the command returns the bytes read on miso during out- put. 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 clock generator output a square wave on the pin(s) set to t mode. the frequency of the square wave is (freq / 2 16 ) reffreq. possible values for reffreq are 20000000, 10000000, 5000000, 2500000, 1250000, 625000, 312500, 156250. possible values if freq are 0 ? 65535. at:clk=off turn off clock generator switch off the clock generator at:clk? get clock generator 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 (1/2 + value / 2 17 ) vdd. an external low pass filter is needed to get smooth output voltages. the modulation frequency is 20 mhz. a possible low pass filter choice is a simple rc low pass filter with r = 10 k and c = 1 f. at:dac=off turn off dac switch off the dac at:dac? get dac return the dac value table 8. registers number name description default range units 300 out of band period ax ? sigfox module 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
ax ? sigfox ? mods www.onsemi.com 13 table 9. device numbers protocol ministamp antstamp sigfox 868 mhz ax ? sf10 ? mini21 ? 868 ax ? sf10 ? ant21 ? 868 table 10. device versions part number at$i=2 at$i=3 at$i=4 at$i=5 ax ? sf10 ? mini21 ? 868 0x8f 0x51 0x01 0x00 ax ? sf10 ? ant21 ? 868 0x8f 0x51 0x01 0x00 life support applications this product is not designed for use in life support appliances, devices, or in systems where malfunction of this product can reasonably be expected to result in personal injury. on semiconductor customers using or selling this product for use in such applications do so at their own risk and agree to fully indemnify on semiconductor for any damages resulting from such improper use or sale. on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent ? marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 ax ? sigfox ? mods/d sigfox and sigfox ready are registered trademarks of sigfox sarl. 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 on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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