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www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 1 / 14 preliminary datasheet sdp3 x - d igital digital differential pressure sensor ? smallest size enabl es portable applications ? reflow solderable C pick & place ? excellent repeatability, no drift, no offset ? extended feature set C smart averaging ? calibrated and temperature compensated product s ummary the sdp3x sensor family is sensirions series of small differential pressure sensors designed for high - volume applications where size is a key requirement. it builds on the next generation cmosens? sensor chip that is at the heart of sensirions new differ ential pressure and flow sensing platform. the digital sdp3x sensor features fast measurement speed, excellent accuracy and long - term stability and has no zero - point drift. furthermore, it is reflow solderable and provides extended functionality, such as smart averaging , multiple temperature compensation modes , configurable i 2 c address and interrupt s . benefits of sensirions cmosens ? t echnology ? high reliability and long - term stability ? best signal - to - noise ratio ? industry - proven technology with a track record of more than 15 years ? designed for mass production ? high process capability content 1. sensor performance ................................ .............................. 2 2. specifications ................................ ................................ ......... 3 3. pin assig nment ................................ ................................ ...... 4 4. measurement modes ................................ ............................. 5 5. digit al interface description ................................ ................... 6 6. package outline ................................ ................................ ... 11 7. soldering ................................ ................................ .............. 12 8. shipping pack age ................................ ................................ 13 9. ordering information ................................ ............................ 13 revision history ................................ ................................ ............ 13 important no tices ................................ ................................ ......... 14 headquarters and subsidiaries ................................ .................... 14
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 2 / 14 1. sen sor p erformanc e 1.1 differential p ressure s pecification 1 parameter SDP31 sdp32 measurement range 2 - 500 to + 500 pa ( 2 inches h 2 o) - 125 to + 125 pa ( ? inch h 2 o) zero point accuracy 3 , 4 0.1 pa 0.08 pa span accuracy 3 , 4 3% of reading 3% of reading zero point repeatability 4 0.03 pa 0.025 pa span repeatability 4 0.5% of reading 0.5% of reading span shift due to temperature variation < 0.5% of reading per 10c < 0.5% of reading per 10c offset stability < 0.01 pa/year < 0.01 pa/year flow step response time ( 63 ) < 3ms resolution 16 bit calibrated for air, n 2 media compatibility air, n 2, o 2 , non - condensing calibrated temperature range - 40 c to +85 c 1.2 temperature s pecification 5 parameter value measurement range - 40 c to +85 c resolution 16 bit accuracy 2 c ( - 10 c to + 60 c) 3 c ( - 40 c to + 85 c) repeatability 0.1 c 1 unless otherwise noted, all sensor specifications are valid at 25c with vdd = 3.3 v and absolute pressure = 966 mbar. 2 for o ther pressure ranges contact sensirion 3 in cludes repeatability 4 total accuracy/repeatability is a sum of zero - point and span accuracy/repeatab ility. 5 the measured temperature is the temperature of the bulk silicon in the sensor. this temperature value is not only depending o n the gas temperature, but also on the sensors surroundings. using the signal to measure solely the gas temperature will need special precautions, such as isolating the sensor from external temperate influences.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 3 / 14 2. specifications 2.1 electrical s pecifications parameter symbol condition min. typ. max. units comments supply voltage v dd 3.0 3.3 4 v for 5v supply contact sensirion power - up/down level v por 2.3 2.5 2.7 v vdd ramp up slew v dd, ramp 0.2 v/ms minimum voltage ramp up slew when powering up sdp3x supply current i dd measuring 3.8 5.5 ma idle state 1.1 ma irqn driving strength 4 ma 2.2 timing s pecifications parameter symbol condition min. typ. max. units comments power - up time t pu 25 ms time to sensor ready soft reset time t sr 20 ms time between soft reset command and sensor ready i 2 c scl frequency f i2c 400 1000 khz update rate differential pressure value c ontinuous mode 900 1000 1100 hz u pgrade to 2khz expected in m a rch 201 7 update rate temperature value c ontinuous mode 112.5 125 137.5 hz temperature value is updated once every eight pressure values measurement time t riggered mode 40 45 50 ms 2.3 mechanical s pecifications parameter symbol condition min. typ. max. units comments allowable overpressure 1 p max 1 b ar rated burst pressure p burst 3 bar weight w 0. 2 g 2.4 materials parameter wetted materials g lass (silicon nitride, silicon oxide), lcp, green epoxy - based mold compound, epoxy - based resins reach, rohs reach and rohs compliant 2.5 absolute m aximum r atings parameter rating units supply voltage v dd - 0.3 to 4.5 v max voltage on pins sda, scl, irqn - 0.3 to v dd +0.3 v input current on any pin 70 ma operating temperature range 2 - 40 to +85 c storage temperature range 3 - 40 to +85 c max. humidity for long term exposure 40c dew point esd hbm (human body model) 2 kv 1 allowable overpressure during operation . r efer to the sdp selection guide for pressure dependency of the measured signal. fast a bsolute pressure changes on both ports can result in dynamic effects on the sensor signal. for higher over pressures or continuous high overpressures contact sensirion. 2 for a ir and n 2 . long term exposure to high temperatures and (high concentrations of) o 2 can reduce the product lifetime 3 for long term storage in tape and reel , please refer to the sdp3x handling instructions
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 4 / 14 3. pin a ssignment the sdp3 x consists of a qfn package with a plastic cap covering the top and providing the pneumatic connections to the sensor . the pin assignments of the sdp3 x - d igital can be found in table 1 . pin no. name description 1 gnd connect to ground 2 gnd connect to ground 3 gnd connect to ground 4 irqn interrupt output. active low . keep floating when not used. 5 scl serial clock (i 2 c interface) 6 gnd connect to ground 7 vdd vdd supply 8 sda bidirectional serial data (i 2 c interface) 9 addr i 2 c address selection input . 10 gnd connect to ground 11 gnd connect to ground 12 - 16 - reserved. do not connect table 1 : sdp3 x - d igital pin assignment ( bottom view). 3.1 power p ins (vdd, gnd ) the power supply pins must be decoupled with a 100 nf capacitor that shall be placed as cl ose to the sensor as possible. 3.2 serial c lock and s erial d ata (scl, sda) the scl and sda are bidirectional pins of the i 2 c slave interface. the scl is the serial clock pin and the sda is the serial data pin. for more details about the i 2 c interface refer to section 5 . 3.3 addr p in the sdp3 x - d igital supports different i 2 c addresses. with the addr pin an address can be selected. connecting the addr pin to gnd selects the default address. other i 2 c addresses can be selected with a resistor connected to gnd. the maximum tolerance for the resistor is 5%. do not connect the addr pin to vdd. i 2 c address (hex) condition 0x21 addr connected to gnd 0x22 addr connected with 1.2k ohm to gnd 0x23 addr connected with 2.7k ohm to gnd 3.4 irqn p in the irqn pin indicates whether new measurement results are available. the signal is active low, meaning that when the signal is high there is no new measurement data available. the irqn will automatically clear to high when a diffe rential pressure value is read out. the irqn pin will also be set to low after every soft reset or power on reset, until a measurement command is sent. when the irqn signal is not used, the pin should stay unconnected and must not be connected to gnd or vdd. 3.5 die p ad ( c enter p ad) the die pad or center pad is visible from below and located in the center of the package. it is internally connected to gnd and therefore there are no electrical constraints on connecting or not connecting the die pad to gnd. for mechanical stability it is recommended to solder the center pad to the pcb. the hole in the middle of the die pad must stay open during soldering.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 5 / 14 4. m easurement m odes the sdp3 x - d igital is a highly v ersatile differential pressure sensor and is very flexible regarding the measurement speed. this flexibility not only allows for optimizing the sensors performance to a specific application , but also for adapting the sensor to different use cases. for example in one use case the sensor is detecting the smallest and quickest changes, whereas at another time the sensor can measure in larger intervals while consuming only little energy. 4.1 continuous m ode vs t riggered m ode in continuous mode the sensor is measuring at the highest speed and wr ites the measurement values to the i 2 c results buffer, where the i 2 c master can read out the value when it requires. in triggered mode the sensor is default in an idle state and wakes up when the command is sent. it then powers up the heater and does a me asurement. during this time the sensor doesnt acknowledge any i 2 c read header or stretches the clock . when the measurement is finished the sensor returns to the idle state and makes the measurement result available to be read out. for more details see cha pter 5.3.3 . continuous mode triggered mode description measures continuously measures once after command is sent measurement speed and rate measurement result can be read out continuously and at any time, but not faster than 1ms ( upgrade to 0.5ms expected in m a rch 201 7 ). measurement result is available with in +/ - 45 ms after command. clock stretching is available. measurement method sensor configuration is optimized for speed and accuracy . sensor configuration is optimized for low power consumption. recommended use best used where speed and accuracy are most important . best used where energy consumption is more important than speed . 4.2 continuous m ode and a verage till r ead in continuous measurement mode s a new measurement result is available every 1ms ( upgrade to 0.5ms expected in m a rch 201 7 ). a new value can be read out every 1 ms and the irqn will go low when a new measurement result is available. if the average till read option is chosen, th e sensor average s all values ( x i ) prior to the read out. this has the benefit that the user can read out the sensor at its own desired speed, without losing information and thus prevents aliasing. during the first 25 ms of averaging the avera ged value is obtained as the arithmetic mean . ? ? = ? ? ? ? ? = 1 for ? < 25 ms when the reading speed is even slower than 25 ms, the sensor will continue to average, but with another algorithm. in this algorithm exponential smoothing is used, with a smoothing factor ? = 0.05. ? ? = ? ? ? ? + ( 1 ? ? ) ? ? ? ? 1 , ? 0 = ? , ? for ? > 25 ms where s 0 is the arithmetic value after the first 25 ms. please refer to relevant literature for more information about exponen tial smoothing. 4.3 temperature c ompensation m odes and absolute pressure dependency the sdp3x is temperature compensated both for differential pressure and for mass flow compensated differential pressure. in use cases where the sdp3x is used to measure mass flow it is advised to use mass flow temperature compensation . i n this case no absolute pressure compensation is required . for more information about temperature and absolute pressure compensation for differential pressure sensors, for example volume flow measurements in bypass, refer to the selection guide in the differential pressure download center on our website.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 6 / 14 5. digital i nterface d escription the sdp3 x - digital interface is compatible with the i 2 c protocol. this chapter describes the command set for sdp3 x - digital . for detailed information about the i 2 c protocol, please check the document "nxp i 2 c - bus specification and user manual". 5.1 i 2 c a ddress the i 2 c address for sdp3 x - digital can be selected wit h the addr pin. for more information refer to section 3.3 . 5.2 i 2 c s equences the commands are 16 - bit. data is read from the sensor in multiples of 16 - bit words, each followed by an 8 - bit checksum to ensure communication reliability. i 2 c master writes 16 bit command i 2 c master sends read header and receives multiple 16bit words with crc byte. dark areas with white text indicate that the sensor controls the sda (data) line. i 2 c sequences can be aborted with a nack and stop condition. 5.3 i 2 c c ommands the command set of the sdp3 x - digital consists of a set of different commands: - continuous measurement o start continuous measurement commands o stop measurement command - triggered measurement commands - read product identifier and serial number - s oft reset s w ack i2cadr[6:0] cmd[15:8] ack cmd[7:0] ack s r ack i2cadr[6:0] data 1 [15:8] ack data 1 [7:0] ack crc1 [7:0] ack p data 2 [15:8] ack data 2 [7:0] ack crc2 [7:0] ack p or data x [15:8] ack data x [7:0] ack crcx [7:0] ack p or
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 7 / 14 5.3.1 start c ontinuous m easurem ent the sensor measures both the differential pressure and temperature. both measurement results can be read out through one single i 2 c read header. continuous measurements can be started up in different configurations by a set of commands. command code (hex) temperature c ompensation averaging 0x3603 mass f low average till read 0x3608 mass f low no ne - update rate 1ms 0x36 15 differential pressure average till read 0x36 1e differential pressure no ne - update rate 1ms after one of the commands has been sent, the chip continuously measures and updates the measurement results. new results can be read continuously with only an i 2 c read header. (measurement) commands must not be sent until the stop measurement command has been sent. after the start measurement command is sent : - t he first measurement result is available after 8ms ; . - s mall accuracy deviations (%mv) can occur during the next 12 ms . when no measurement data is yet available the sensor will respond with a nack to the i 2 c read header (i 2 c address + read bit). preceding command consecutive read description continuous measurement byte1: d ifferential p ressure 8msb byte2: d ifferential p ressure 8lsb byte3: crc byte4: temp erature 8msb byte5: temp erature 8l s b byte6: crc byte7: scale factor differential pressure 8msb byte8: scale factor differential pressure 8l s b byte9: crc after a start continuous measurement commands, the measurement results can be read out. the temperature and scale factor dont need 5.3.2 stop c ontinuous m easurement command command code (hex) description stop continuous measurement 0x3ff9 this command stops the continuous measurement. it powers off the heater and makes the sensor receptive for another command. the stop command is also required when switching between different continuous measurement commands. when the sensor is in continuous measurement mode, the sensor must be stopped before it can accept another command. the only exception is the s oft r eset command as described in section 5.3.5 . in idle mode the s ensor will consume less power.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 8 / 14 5.3.3 triggered m easurement during a triggered measurement the sensor measures both differential pressure and temperature. the measurement starts directly after the command has been sen t . the command need s to be repeated with every measurement. command code (hex) temperature compensation clock stretching 0x36 24 mass f low 0x37 26 mass f low yes 0x36 2f differential pressure 0x37 2d differential pressure yes during the 45 ms that the sensor is measuring, no command can be sent to the sensor . after the 45 ms the result can be read out and any command can be sent to the sensor. monitoring whether or not the sensor is ready with its measurement can be done with the following methods. method available description clock stretching only for clock stretching commands the sensor starts the measurement a fter the triggered measurement command with clock stretching. when an i 2 c read header is sent within 45 ms the sensor performs clock stretching after acknowledging the read header. when the sensor has finished the measurement, it makes the result available by releas ing the scl. polling only for non - clock stretching commands in this mode the sensor does not acknowledge (nack) an i 2 c read header as long as no measurement result is available. irqn a lways the irqn is always available to monitor whether the sensor is ready with the measurement. when the irqn is low, the sensor indicates that a new measurement result can be read out. the irqn is self - clearing when the result is read - out. when new measuremen t data is available it can be read out by sending an i 2 c read header and reading out the data from the sensor. in the table below the data layout of the results can be found. preceding command consecutive read description t riggered measurement byte1: d ifferential p ressure 8msb byte2: d ifferential p ressure 8lsb byte3: crc byte4: temp erature 8msb byte5: temp erature 8 l s b byte6: crc byte7: scale factor differential pressure 8msb byte8: scale factor differential pressure 8 l s b byte9: crc after a triggered measurement command , the results can be read out when the sensor is finished with the measurement. the temperature and scale factor dont need to be read out (every time). the read sequence can be aborted by a nack and a stop condition.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 9 / 14 5.3.4 read p roduct i dentifier during assembly and start - up of the machine it might be required to check some basic parameters in the sensor - for example to check if the correct sensor is integrated. the p roduct i dentifier and s erial n umber can be read out after send ing a se quence of two commands. command command code consecutive read description read p roduct i dentifier 0x367c 0xe10 2 byte1: product number [31:24] byte2: product number [23:16] byte3: crc byte4: product number [15:8] byte5: product number [7:0] byte6: crc byte7: serial number [63:56] byte8: serial number [55:48] byte9: crc byte10: serial number [47:40] byte11: serial number [39:32] byte12: crc byte13: serial number [31:24] byte14: serial number [23:16] byte15: crc byte16: serial number [15:8] byte17: serial number [7:0] byte18: crc note that both commands need to be preceded with an i 2 c write header (i 2 c address + w). th e second command returns: - 32 bit u nique product and revis ion number . the number is listed in the table below. note that the last 8 bits are the revision number and are subject to change as long as the datasheet is preliminary. - 64 bit unique serial number product product number SDP31 0x0301018 8 sdp32 0x0301028 3 5.3.5 soft r eset command i 2 c address + w bit + c ommand code (hex) consecutive read description general call reset 0x0006 na this sequence resets the sensor with a separate reset block, which is as much as possible detached from the rest of the system on chip . note that the i 2 c address is 0x00, which is the general call address, and that the command is 8 bit. the reset is implemented according to the i 2 c specification. after the reset command the sensor will take maximum 20 ms to reset. during this time the sensor will not acknowledge its address nor a ccept commands.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 10 / 14 5.4 checksum c alculation the checksum byte is generated by a crc algorithm with the following properties: property value name crc - 8 protected d ata read data width 8 bit polynomial 0x31 (x8 + x5 + x4 +1) initialization 0xff reflect input f alse reflect output false final xor 0x00 example crc(0xbeef) = 0x92 5.5 conversion to p hysical v alues conversion of the differential pressure and temperature sensor signals to a physical value is done with the scale factor. 5.5.1 scale f actors parameter SDP31 sdp32 differential pressure 60 pa - 1 240 pa - 1 temperature 200 c - 1 200 c - 1 5.5.2 differential p ressure the digital calibrated differential pressure signal read fr om the sensor is a signed integer number (two's complement number). the integer value can be converted to the physical value by dividing it by the scale factor ( differential pressure in pascal = sensor output ? scale factor). 5.5.3 temperature the digital calibrated temperature signal read from the sensor is a signed integer number (two's complement number). the integer value can be converted to the physical value by dividing it by the scale factor (temperature in c = sensor output ? scale factor).
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 11 / 14 6. package o utline figure 1 : sdp3 x . all dimensions in mm.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 12 / 14 7. soldering recommended land pattern the solder mask is understood to be the insulating layer on top of the pcb covering the copper traces. it is recommended to design the land pattern as a non - solder mask defined (nsmd) type. recommended stencil aperture the sensor must enter the reflow process only once, with a minimal temperature and exposure time. when both sides of the pcb are reflow soldered or multiple reflow runs are required, the sensor must be soldered in the last soldering run. in any case the temperature should not exceed 2 60 c; temperatures above 200c should be limited in time to a maximum of 150 seconds. ensure that the ports of the sensor are well protected during assembly and soldering so that no dust, solder flux or other liquids can enter the flow channel. in no case, a board wash shall be applied. therefore it is strongly recommended to use no - clean solder paste. it is important to note that the diced edge or side faces of the i/o pads may oxidize over time, therefore a solder fillet may or may not form. hence there is no guarantee for solder joint fillet heights of any kind. refer to the sdp3x handling instructions on our website for more details.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 13 / 14 8. shipping p ackag e sdp3x are provided in tape & reel shipment packaging . standard packaging size is 1500 or 250 units per reel. the drawing of the packaging tapes with sensor orientation is shown in figure 2 . figure 2 : sketch of packaging tape and sensor orientation. header tape is to the right and trailer tape to the left on this sketch 9. ordering i nformation use the part names and product numbers shown in the foll owing table when ordering sdp3x differential pressure sensor. for the latest product information and local distributors, visit www.sensirion.com . part name description / output product number packaging tape & reel size SDP31 i 2 c, 500pa 1 - 101445 - 01 tape & reel (qfn quad 2 configuration) 1500 1 - 101567 - 01 tape & reel (qfn quad 2 configuration) 250 sdp32 i 2 c, 125pa 1 - 101498 - 01 tape & reel (qfn quad 2 configuration) 1500 1 - 101570 - 01 tape & reel (qfn quad 2 configuration) 250 revision h istory date author version changes 13 .11.2015 anb v0.1 first draft 22 .12.2015 anb v0.2 rework of all chapters 01.02 .2016 anb v0.3 rework after 1 st review round . preliminary release. 02.02.2016 anb v0.4 minor updates 30 .03.2016 anb v0.5 minor update s . irqn clarification. 04 .0 5 .2016 anb v0.6 sdp32 added . minor updates 27.05.2016 anb v0.7 triggered measurement timing changed. new timings for soft reset. 0 6.01.2017 anb v0.8 added reel size of 250 pcs.
www.sensirion.com version 0. 8 C j a n u a r y 2 0 1 7 14 / 14 important n otices warning, personal injury do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in personal injury (including death). do not use this product for applications other than its inten ded and authorized use. before installing, handling, using or servicing this product, please consult the datasheet and application notes. failure to comply with these instructions could result in death or serious injury. if the buyer shall purchase or use sensirion products for any unintended or unauthorized application, buyer shall defend, indemnify and hold harmless sensirion and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and reasona ble attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if sensirion shall be allegedly negligent with respect to the design or the manufacture of the product . esd precautions the inherent design of this component causes it to be sensitive to electrostatic discharge (esd). to prevent esd - induced damage and/or degradation, take customary and statutory esd precautions when handling this product. see application n ote handling instructions for more information. warranty sensirion warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product shall be of the quality, material and workmanshi p defined in sensirions published specifications of the product. within such period, if proven to be defective, sensirion shall repair and/or replace this product, in sensirions discretion, free of charge to the buyer, provided that: ? notice in writing de scribing the defects shall be given to sensirion within fourteen (14) days after their appearance; ? such defects shall be found, to sensirions reasonable satisfaction, to have arisen from sensirions faulty design, material, or workmanship; ? the defective product shall be returned to sensirions factory at the buyers expense; and ? the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period. this warranty does not apply to any equipment which has not been installed and used within the specifications recommended by sensirion for the intended and proper use of the equipment. except for the warranties expressly set forth herein, sensirion makes no warranties, either express or implied, with respect t o the product. any and all warranties, including without limitation, warranties of merchantability or fitness for a particular purpose, are expressly excluded and declined. sensirion is only liable for defects of this product arising under the conditions o f operation provided for in the datasheet and proper use of the goods. sensirion explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in accordance with the technical specifications. sens irion does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. all operating parameters, including with out limitation recommended parameters, must be validated for each customers applications by customers technical experts. recommended parameters can and do vary in different applications. sensirion reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to improve reliability, functions and design of this product. copyright ? 201 6 - 2017 , sensirion. cmosens ? is a trademark of sensirion all rights reserved headquarters and s ubsidiaries sensirion ag laubisruetistr. 50 ch - 8712 staefa zh switzerland phone: +41 44 306 40 00 fax: +41 44 306 40 30 info@sensirion.com www.sensirion.com sensirion inc., usa phone: +1 805 409 4900 info - us@sensirion.com www.sensirion.com sensirion japan co. ltd. phone: +81 3 3444 4940 info - jp@sensirion.co m www.sensirion.co.jp sensirion korea co. ltd. phone: +82 31 337 7700~3 info - kr@sensirion.com www.sensirion.co.kr sensirion china co. ltd. phone: +86 755 8252 1501 info - cn@sensirion.com www.sensirion.com.cn sensirion taiwan co. ltd. phone: +41 44 306 40 00 info@sensirion.com to find your local representative, please visit www.sensirion.com/contact

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