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www.sensirion.com version 0.5 C january 2017 1 / 14 preliminary datasheet sdp8xx - d igital digital differential pressure sensor ? excellent repeatability, no drift, no offset ? extended feature set C smart averaging ? calibrated and temperature compensated product s ummary the sdp8 00 sensor family is sensirions series of digital differential pressure sensors designed for high - volume applications. the sensors measure the pressure of air and non - aggressive gases with superb accuracy and no offset drift. the sensors cover a pressure range of up to 500 pa (2 inch h 2 o / 5 mbar) and deliver outstanding accuracy , also at the bottom end of the measuring range. the sdp 8 00 features a digital 2 - wire interface, which makes it easy to connect directly to a microprocessor. the outstanding performance of these sensors is based on sensirions patented cmosens? sensor technology, which combines the sensor element, signal p rocessing and digital calibration on a small cmos chip. the differential pressure is measured by a thermal sensor element using flow - through technology. the well - proven cmos technology is perfectly suited for high - quality mass production and is the ideal c hoice for demanding and cost - sensitive oem applications. 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. digital interface description ................................ ................... 6 6. package outline ................................ ................................ ... 11 7. soldering ................................ ................................ .............. 12 8. shipping package ................................ ................................ 13 9. order ing information ................................ ............................ 13 revision history ................................ ................................ ............ 13 important notices ................................ ................................ ......... 14 headquarte rs and subsidiaries ................................ .................... 14
www.sensirion.com version 0.5 C january 2017 2 / 14 1. sen sor p erformanc e 1.1 differential p ressure s pecification 1 parameter sdp800/sdp810 - 500pa sdp 800/sdp810 - 125 pa measurement range 2 - 500 to + 500 pa ( - 2.0 to 2.0 in. h 2 o) - 125 to + 125 pa ( - 0.5 to 0 .5 in. 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 0.05 pa 0.04 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 < 0.05 pa/year < 0.05 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 - 20 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/repeatability. 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 mea sure solely the gas temperature will need special precautions, such as isolating the sensor from external temperate influences.
www.sensirion.com version 0.5 C january 2017 3 / 14 2. specifications 2.1 electrical s pecifications parameter symbol condition min. typ. max. units comments supply voltage v dd 3.0 5.5 v power - up/down level v por 2.3 2.5 2.7 v supply current i dd measuring 3.8 5.5 ma idle state 1.1 ma sleep mode 1 ua 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 2 ms time between soft reset command or exit sleep mode and sensor ready i2c scl frequency f i2c 400 1000 khz update rate differential pressure value c ontinuous mode 1800 2 000 2200 hz update rate temperature value c ontinuous mode 112.5 125 137.5 hz temperature value is updated once every 16 pressure values measurement time t riggered mode 4 0 45 50 ms 2.3 mechanical s pecifications parameter symbol condition min. typ. max. units comments allowable overpressure p max 1 b ar rated burst pressure p burst 5 bar weight w 6 g 2.4 materials parameter wetted materials pbt (polybutylene terephthalate), glass (silicon nitride, silicon oxide), silicon, gold, fr4, silicone as static sealing, epoxy, copper alloy, lead - free solder reach, rohs reach and rohs compliant 2.5 absolute m inimum and m aximum r atings parameter rating units supply voltage v dd - 0.3 to 5 .5 v max voltage on pins (sda, scl ) - 0.3 to v dd +0.3 v input current on any pin 70 ma operating temperature range 1 - 40 to + 85 c storage temperature range - 40 to + 85 c max. humidity for long term exposure 40c dew point esd hbm (human body model) 2 kv 1 for a ir and n 2 . long term exposure to (high concentrations of) o 2 at high temperatures can reduce the product lifetime
www.sensirion.com version 0.5 C january 2017 4 / 14 3. pin a ssignment the pin assignments of the sdp8xx - d igital can be found in table 1 pin no. name description 1 scl serial clock (i 2 c interface) 2 vdd vdd supply 3 gnd connect to ground 4 sda bidirectional serial data (i 2 c interface) table 1 : sdp8xx - d igital pin assignment ( bottom view). sda gnd vdd scl
www.sensirion.com version 0.5 C january 2017 5 / 14 4. m easurement m odes the sdp8xx - 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 de tecting 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 writes t he 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 measurem ent. 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 chapter 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 0.5 ms . measurement result is available 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 0.5m s . a new value can be read out every 0.5 ms . 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 averaged 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 exponential smoothing. 4.3 temperature c ompensation m odes and absolute pressure dependency the sdp 8 x x is temperature compensated both for differential pressure and for mass flow compensated differential pressure. in use cases where the sdp 8xx 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 0.5 C january 2017 6 / 14 5. digital i nterface d escription the sdp8xx - digital interface is compatible with the i 2 c protocol. this chapter describes the command set for sdp8xx - digital . for detailed information about the i 2 c protocol, please check the document "nxp i 2 c - bus specificatio n and user manual". 5.1 i 2 c a ddress the i 2 c address for sdp8xx - digital is 0x2 5 (b 0 1 00 1 0 1 ). the address is followed by a read or write bit. for other i 2 c addresses contact sensirion. 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 sdp8xx - digital consists of a set of different commands: - continuous measurement o start continuous measurement commands o stop measurement command - triggered measurement commands - soft reset - entering and exiting sleep mode - read product identifier and serial number 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 0.5 C january 2017 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 a veraging 0x3603 mass f low average till read 0x3608 mass f low no ne - update rate 0.5 ms 0x36 15 differential pressure average till read 0x36 1e differential pressure no ne - update rate 0.5 ms 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: - the first measurement result is available after 8ms;. - small accuracy deviations (%mv) can occur during the next 12ms. 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: dp 8msb byte2: dp 8lsb byte3: crc byte4: temp 8msb byte5: temp 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 to be read out (every time). the read sequence can be aborted by a nack and a stop condition. 5.3.2 stop c ontinuous m easuremen t command command code (hex) description stop continuous measurement 0x3ff9 this command stops the continuous measurement and puts the sensor in idle mode . it powers off the heater and makes the sensor receptive to 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 0 . in idle mode the s ensor will consume less power , but consider the sleep mode for most effective energy saving.
www.sensirion.com version 0.5 C january 2017 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 compens ation 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 releasing 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. when new measurement 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: dp 8msb byte2: dp 8lsb byte3: crc byte4: temp 8msb byte5: temp 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 o ut 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. 5.3.4 soft reset command i 2 c address + w bit + command 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 2 ms to reset. during this time the sensor will not acknowledge its address nor accept commands.
www.sensirion.com version 0.5 C january 2017 9 / 14 5.3.5 entering and exiting sleep mode in sleep mode the sensor uses the minimum amount of current. the mode can only be entered from idle mode, i.e . when the sensor is not measuring. this mode is particularly useful for battery operated devices. to minimize the current in this mode, the complexity of the sleep mode circuit has been reduced as much as possible, which is mainly reflected by the way the sensor exits the sleep mode. in sleep mode the sensor cannot be soft reset. command c ommand code (hex) consecutive read description enter sleep mode 0x 3677 na triggered mode: the sleep command can be sent after the result have been read out and the sensor is in idle mode. continuous mode: the sleep command can be sent after a stop continuous measurement command has been issued and is in idle mode . exit sleep mode na na the sensor exits the sleep mode and enters the idle mode when it receives the valid i 2 c address and a write bit (0) . note that the i 2 c address is not acknowledged. it is necessary to poll the sensor to see whether the sensor has received the address and has woken up. this should take maximum 2 ms. 5.3.6 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 sequence 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 i2c write header (i2c address + w). th e second command returns: - 32 bit unique product and revision number. the number is listed in the table below. note that the last 8 bits are the revision number and a re subject to change as long as the datasheet is preliminary. - 64 bit unique serial number product product number sdp800 - 500pa 0x0302018 6 sdp810 - 500pa 0x03020 a 8 6 sdp800 - 125pa 0x0302028 6 sdp810 - 125pa 0x03020b8 6
www.sensirion.com version 0.5 C january 2017 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 sdp8 xx - 500pa sdp8 xx - 125pa 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 p ressure 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 0.5 C january 2017 11 / 14 6. package o utline 6.1 dimensions sdp80x C manifold connection figure 1 : sdp80x. all dimensions in mm. 6.2 dimensions sdp81x C tube connection figure 2 : sdp81x. all dimensions in mm.
www.sensirion.com version 0.5 C january 2017 12 / 14 6.3 footprint figure 3 : footprint for pcb mounting (top view = sensor side). all dimensions in mm. a: overall sensor dimensions b: holes for additional mounting screws (optional) in case the sensor is not mounted on a pcb and is connected with a cable the sdp 800/sdp 600 series cap is recommended. 7. soldering standard wave soldering systems may be used for soldering sdp800 series sensors . reflow soldering is not feasible and may damage the sensor. the sensor ports must be protected from solder splash and flux during soldering. figure 4 shows an appropriate temperature profile with maximum temperature values. figure 4 : suitable wave soldering profile. the characteristics of wave soldering machines vary, so any soldering setup must be tested before production use. 200c 150c 100c 50c 0c 250c start flux zone preheat zone entrance to solder wave exit from solder wave solder wave peak temp. max. 260c max 145c approx. pcb bottom - side temp. pcb top - side temperature approx. 1 min (time in wave < 2 s) a b scl vdd gnd sda
www.sensirion.com version 0.5 C january 2017 13 / 14 8. shipping p ackag e sdp 8 xx are shipped in trays of 80pcs. the tray dimension is 355mm x 255mm x 21.5mm. by piling them up, the height per tray can be considered as 19mm. 9. ordering i nformation use the part names and item numbers shown in the foll owing table when ordering sdp8 00 series differential pressure sensor. for the latest product information and local distributors, visit www.sensirion.com . part name description / output product number sdp800 - 500pa manifold mount, 500pa, i 2 c address 0x25 1 - 101551 - 01 sdp810 - 500pa tube connection, 500pa, i 2 c address 0x25 1 - 101532 - 01 sdp800 - 125 pa manifold mount, 125 pa, i 2 c address 0x25 1 - 101599 - 01 sdp810 - 125 pa tube connection, 125 pa, i 2 c address 0x25 1 - 101597 - 01 revision h istory date author version changes 01 .0 5. 2016 anb v0.1 first draft 08 .08.2016 anb v0.2 update product ids and add ed 125pa variants 09.09.2016 anb v0.3 product number added. soft reset time and triggered measurement time changed. product revision updated. 06 .12.2016 anb v0.4 product numbers added. minor changes. 27 .01.2017 anb v0.5 drawings updated . sleep mode added.
www.sensirion.com version 0.5 C january 2017 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 intended and authorized use. before installing, handling, using or servicing this p roduct, 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 reasonable attorney fees arising out of, directly or indirectly, any claim of persona l 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 sensit ive to electrostatic discharge (esd). to prevent esd - induced damage and/or degradation, take customary and statutory esd precautions when handling this product. see application note 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 workmanship 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 describing the defects shall be given to sensirion within fourteen (14) days aft er 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 sensirio n 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 to the product. any and all warranties, including without limitation, warrantie s 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 of operation provided for in the datasheet and proper use of the goods. sensiri on 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. sensirion does not assume any liability arising out of any application or use of a ny product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. all operating parameters, including without limitation recommended parameters, must be validated for each customers a pplications 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) t o 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: +1 312 690 5858 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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