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MS4515DO MS4515DO www.meas-spec.com april 2012 1/19 ? pcb mounted digital output transducer ? combination temperature and pressure ? pressure ranges from 2 to 30inh 2 o ? i 2 c or spi protocol ? differential & gage ? temperature compensated ? 3.3 or 5.0 vdc supply voltage ? low power option available (standby < 1ua) description the MS4515DO is a small, ceramic based, pcb mounted pressure transducer from measurement specialties. the transducer is built using measurement specialties? proprietary ultrastable? process and the latest cmos sensor conditioning circuitry to create a low cost, high performance digital output pressure (14bit) and temperature (11bit) transducer designed to meet the strictest requirement s from oem customers. the MS4515DO is fully calibrated and temperature compensated with a total error band (teb) of less than 1.0% over the compensated range. the sensor operat es from single supply of either 3.3 or 5.0vdc and requires a single external component for proper operation. the rugged ceramic transducer is available in side port, top port, and manifold mount and can measure absolute or differential pressure from 2 to 30 inh20. the 1/8? barbed pressure ports mate securely with 3/32? id tubing. features applications ? inh 2 o pressure ranges ? blocked filter detection ? pcb mountable ? altitude and airspeed measurements ? digital output ? medical instruments ? barbed pressure ports ? ? panel meter standard ranges (in h 2 o) range gauge differential option availability 2 ds, ss, tp, mm -l 4 ds, ss, tp, mm ds, ss, tp, mm -l 5 ds, ss, tp, mm ds, ss, tp, mm -l 10 ds, ss, tp, mm ds, ss, tp, mm -f, -l 20 ds, ss, tp, mm ds, ss, tp, mm -f, -l 30 ds, ss, tp, mm ds, ss, tp, mm -f, -l see package configurations: ds= dual side port, ss= single side port, tp= top port, mm= manifold mount only i2c protocol is available on ?l? type pin st yles; reference ordering information for details pin style ?l? is only available ss and mm port types.
MS4515DO MS4515DO www.meas-spec.com april 2012 2/19 block diagram absolute maximum ratings paramete r conditions min max unit notes supply voltage t a = 25 c 2.7 5.5 v output current t a = 25c 3 ma load resistance (r l ) t a = 25c 10 k ? storage temperature -40 +125 c humidity t a = 25c 95 %rh non condensing overpressure t a = 25 c, both ports not to exceed 300 psi burst pressure t a = 25 c, port 1 psi see table 1 esd hbm -4 +4 kv en 61000-4-2 solder temperature 250c, 5 sec max. table 1- burst pressure by range and package style range ds ss, tp, mm unit 002 10 10 psi 004 10 10 psi 005 10 10 psi 010 10 10 psi 020 20 20 psi 030 20 20 psi
MS4515DO MS4515DO www.meas-spec.com april 2012 3/19 environmental specifications paramete r conditions mechanical shock mil spec 202f, method 213b, condition c, 3 drops mechanical vibration mil spec 202f, method 214a, condition 1e, 1hr each axis thermal shock 100 cycles over st orage temperature, 30 minute dwell life 1 million fs cycles mttf >10yrs, 70 oc, 10 million pressure cycles, 120%fs pressure performance specifications supply voltage 1 : 5.0v or 3.3 vdc reference temperature: 25c (unless otherwise specified) parameters min typ max units notes pressure accuracy -0.25 0.25 %span 2 total error band (teb) -1.0 1.0 %span 3,7 total error band (teb) 4inh20 and below -2.0 2.0 %span 3,7 temperature accuracy 1.5 oc 4 supply current 3 ma 7 compensated temperature 0 +60 oc 5 operating temperature -10 +85 oc output pressure resolution 14 bits output temperature resolution 8 11 bits response time 0.5 ms 6 start time to data ready 8.4 ms 6 weight 3 grams media non-corrosive dry gases compatible with ceramic, silicon, pyrex, pps, rtv, gold, aluminum and epoxy. see ?wetted material by port designation? chart below. notes 1. proper operation requires an external capac itor placed as shown in connection diagram. output is not ratiometric to supply voltage. 2. the maximum deviation from a best fit straight line (bfsl) fitted to the output measured over the pressure range at 25c. in cludes all errors due to pressure non linearity, hysteresis, and non repeatability. 3. total pressure error band includes all accuracy errors, thermal errors over the compensated temperature range and span and o ffset calibration tolerances. for ideal sensor output with respect to input pressure and temperature, reference transfer function ch arts below. teb values are valid only at the calibrated supply voltage. 4. the deviation from a best fit straight line (bfsl) fitted to the output measured ov er the compensated temperature range. 5. for errors beyond the compensated temperature range, see extended temperature multiplier chart below. 6. start time to data ready is the time to get valid data afte r por (power on reset). the time to get subsequent valid data is then specified by the response time specification. 7. this product can be configured for custom oem requirements, contact factory for lo wer power consumption or higher accuracy.
MS4515DO MS4515DO www.meas-spec.com april 2012 4/19 connection diagram notes 1. place 100nf capacitor between supply and gnd to within 2 cm of sensor. pressure and temperature transfer function 0 cc 199 266 333 400 4cc 599 666 733 7ff output( 2 11 hex counts) temperature 60 c 0 c -50 c 150 c tmin tmax 0000 0666 2000 399a 3fff pmin output( 2 14 hex counts) pmax pressure 0333 3ccb a t y p e b t y p e output( decimal counts) = __________ 80% *16383 pmax-pmin * (pressure applied + 10%*16383 output( decimal counts) = __________ 90%*16383 pmax-pmin * + 5%*16383 a type: b type: -pmin) (pressure applied -pmin) output (decimal counts) (output c - (-50c) ) tmin * 2047 (150c tmax - (-50c) ) tmin _________________________________ =
MS4515DO MS4515DO www.meas-spec.com april 2012 5/19 extended temperature multiplier chart package, pinout & pre ssure type configuration 0.0 0.5 1.5 -10 2.0 0 102030405060 80 70 90 1.0 2.5 1 2 3 4 1 2 3 4 5 6 7 8 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
MS4515DO MS4515DO www.meas-spec.com april 2012 6/19 pin name pin function gnd 1 ground supply 2 positive supply voltage sda miso 3 i2c data spi data scl sclk 4 i2c clock spi clock int ss 5 i2c in terrupt spi chip select 6-8 no connection pressure type pmin pmax description differential/ bidirectional -prange +prange output is proportional to the difference bet ween port 1 and port 2. output swings positive when port 1> port 2. output is 50% of total counts when port 1=port 2 gauge 0psig +prange output is proportional to the difference between 0psig (pmin) and port 1. output swings positive when port 1> port 2. prange is equal to the maximum full scale pre ssure specified in the ordering information. wetted material by port designation material style port pps ceramic silicon py rex rtv gold aluminum epoxy ds, mm port 1 x x x x x x port 2 x x x x x x x x ss, tp port 1 x x x x x x x x "x" indicates wetted material
MS4515DO MS4515DO www.meas-spec.com april 2012 7/19 dimensions
MS4515DO MS4515DO www.meas-spec.com april 2012 8/19
MS4515DO MS4515DO www.meas-spec.com april 2012 9/19
MS4515DO MS4515DO www.meas-spec.com april 2012 10/19
MS4515DO MS4515DO www.meas-spec.com april 2012 11/19
MS4515DO MS4515DO www.meas-spec.com april 2012 12/19 i 2 c and spi interface specifications 1. i 2 c interface specification the serial interface of the 4515do/4525do seri es is optimized in terms of sensor readout and power consumption when the factory setting for i2 c. for detailed specifications of the i 2 c protocol, see the i 2 c bus specification, version 2.1, january 2000. 1.1 interface connection-external bi-directional bus lines are implemented by t he devices (master and slave) using open-drain output stages and a pull-up resistor connected to the positive su pply voltage. the recommended pull-up resistor value depends on the system setup (capacitan ce of the circuit or cable and bus clock frequency). in most cases, 4.7k ? is a reasonable choice. the capacitive loads on sd a and scl line have to be the same. it is important to avoid asymmetric capacitive loads. 1.2 i 2 c address the i 2 c address consists of a 7-digit binary value. the factory setting for i 2 c slave address is 0x28, 0x36 or 0x46 depending on the interface type select ed from the ordering information. the address is always followed by a write bit (0) or read bit (1).the default hexadecimal i 2 c header for read access to the sensor is therefore 0x51, 0x6d, 0x8d respectively, based on the ordering information. 1.3 int/ss pin when programmed as an i 2 c device, the int/ss pin operates as an interrupt. the int/ss pin rises when new output data is ready and falls when the next i 2 c communication occurs. 1.4 transfer sequences transmission start condition (s): the start condition is a unique sit uation on the bus created by the master, indicating to the slaves the beginning of a tran smission sequence (the bus is considered busy after a start). i 2 c transmission start condition vdd sda scl master slave(4515do/4525do) both bus lines, sda and scl, are bi-directional and therefore require an extemal pull-up resistor.
MS4515DO MS4515DO www.meas-spec.com april 2012 13/19 transmission stop condition (p): the stop condition is a unique situation on the bus created by the master, indicating to the slaves the end of a transmiss ion sequence (the bus is considered free after a stop). acknowledge (ack) / not acknowledge (nack): each byte (8 bits) transmitted over the i 2 c bus is followed by an acknowledge condition from the receiver. this means that after the master pulls scl low to complete the transmission of the 8th bit, sda will be pu lled low by the receiver during the 9th bit time. if after transmission of the 8th bit the receiver does not pull the sda line low, this is considered to be a nack condition. if an ack is missing during a slave to master transmissi on, the slave aborts the transmission and goes into idle mode. i 2 c transmission start condition a high to low transition on the sda line while scl is high sda scl start condition i 2 c transmission stop condition a low to high transition on the sda line while scl is high stop condition sda scl sda scl ack d7 d0 ack acknowledge not acknowledge i 2 c acknowledge / not acknowledge each byte is followed by an a cknowledge or a not acknowledge, generated by the receiver
MS4515DO MS4515DO www.meas-spec.com april 2012 14/19 1.5 data transfer format data is transferred in byte packets in the i 2 c protocol, which means in 8-bit fr ames. each byte is followed by an acknowledge bit. data is transferred with the most significant bit (msb) first. a data transfer sequence is initiated by the master generating the start condition (s) and sending a header byte. the i 2 c header consists of the 7-bit i 2 c device address and the data direction bit (r/_w). the value of the r/_w bit in the header determines t he data direction for the re st of the data transfer sequence. if r/_w = 0 (write) the direction remains mast er-to-slave, while if r/_w = 1 (read) the direction changes to slave-to-master after the header byte. 1.6 command set and data transfer sequences the i 2 c master command starts with the 7bit slave addres s with the 8th bit =1 (read).the sensor as the slave sends an acknowledge (ack) indicating success. the sensor has four i 2 c read commands: read_mr, read_df2, read_df3, and read_df4.fi gure 1.6 shows the struct ure of the measurement packet for three of the four i 2 c read commands, which are explai ned in sections 1.6.1 and 1.6.2 figure 1.6 ? i 2 c measurement packet reads ?
MS4515DO MS4515DO www.meas-spec.com april 2012 15/19 1.6.1 i 2 c read_df (data fetch) for data fetch commands, the number of data by tes returned by the rbicilite? is determined by when the master sends the nack and stop condition. for the r ead_df3 data fetch command (data fetch 3 bytes; see example 3 in figure 1.6), the sensor returns three bytes in response to the master sending the slave address and the read bit (1): two bytes of bridge data with th e two status bits as the msbs and then 1 byte of temperature data (8-bit accuracy). a fter receiving the required number of data bytes, the master sends the nack and stop condition to terminate the read operat ion. for the read_df4 co mmand, the master delays sending the nack and continues reading an additional final byte to acquire the full corrected 11-bit temperature measurement. in this case, the last 5 bits of the fi nal byte of the packet are undetermined and should be masked off in the application. the read_df2 command is used if corrected temperature is not required. the master terminates the read operation after the two bytes of bridge data (see example 2 in figure 1.6). the two status bits (bit 15 and bit 14) give an indica tion of stale or valid data depending on their value. a returned value of 00 indicate ?normal operation and a good data packet? while a returned value of 10 indicates ?stale data that has been already fetched?. users that use ?status bit? polling should select a frequency slower than 20% more than the response time.
MS4515DO MS4515DO www.meas-spec.com april 2012 16/19 2. spi interface specification the spi interface of sensor ca n be programmed for falling-edge miso change. 2.2 spi read_df (data fetch) for simplifying explanations and illustrations, only falling edge spi polarity will be discussed in the following sections. the spi interface will have data change after the falling edge of sclk. the master should sample miso on the rise of sclk. the entire output packet is 4 bytes (32 bits). the high bridge data byte comes first, followed by the low bridge data byte. then 11 bits of corrected temperature (t[10:0]) are sent: first the t[10:3]byte and then the {t[2:0],xxxxx} byte. the last 5 bits of the final byte are undetermined and should be masked off in the application. if the user only requires the corrected bridge value, the read can be terminated after the 2nd byte. if the corrected temperature is also required but only at an 8-bit resolution, the read can be terminated after the 3rd byte is read. figure 2.2 ? spi output packet with falling edge spi_polarity sclk miso ss hiz s1 s0 b13 b12 b7 b6 b0 t10 t9 t1 t0 hiz packet = [ {s(1:0),b(13 :8)},{b(7:0)},{t(10:3)}, {t(2:0),xxxxx}] where s(1:0) = status bits of packet (normal, command, busy, diagnostic) b(13:8) = upper 6 bits of 14-bit bridge data. b(7:0) = lower 8 bits of 14-bit bridge data. t(10:3) = corrected temperature data (if application does not require corrected temperature, terminate read early) t(2:0),xxxxx =. remaining bits of corrected temperature data for full 11-bit resolution hiz = high impedance
MS4515DO MS4515DO www.meas-spec.com april 2012 17/19 timing diagram i 2 c timing diagram spi timing diagram data setup time on sda relative to scl edge stop condition setup time on scl bus free time between st op and start condition minimum scl clock high width @1 parameters typ min max units minimum scl cloc k low width @1 sclk clock frequency start condition hold ti me relative to scl edge i2c interface prrameters start condition setup time relative to scl edge data hold time on sd a relative to scl edge khz symbol @1 combined low and high widths must equal or exceed minimum scl period. fscl thdsta tlow thigh tsusta thddat tsudat tsusto tbus 100 400 0.1 0.6 0.6 0.1 0 0.1 0.1 2 us us us us us us us us sda scl t low t hddat t hddat t high t sudat t susta t hdsta t susto t bus rise of ss relative to last clock edge bus free time between rise and fall of ss minimum scl clock low width @1 parameters typ min max units ss drop to first clock edge sclk clock frequency spi interface prrameters clock edge to data transition khz symbol @1 combined low and high widths must equal or exceed minimum sclk period. fscl thdss tlow thigh tclkd tsuss 50 800 2.5 0.6 0.6 0 0.1 2 us us us us us us minimum scl clock high width @1 tbus 0.1 sclk miso ss t clkd t low t clkd t suss t bus hiz hiz
MS4515DO MS4515DO www.meas-spec.com april 2012 18/19 available options gel coat (-f option) the ms45x5 is designed for non ionic and clean dry air applications. select this option for added protection in high humidity or slightly corrosive environments with the application of a silicone gel elastomer to sensor and asic. for questions concerning media co mpatibility, contact the factory. low power (-l option) select this option for battery powered or handheld device applications. in this configuration, the sensor and calibration microcontroller are powered down, drawing a current of ~ 0.6ua (vs=5.0 vdc). when the master sends a read mr (measurement request) command (i 2 c or spi); the sensor is ?awaken? and begins the measurement cycle; data is then placed onto the output registers. the se nsor and calibration microcontroller are powered down again, awaiting the read df (data fetch) command from the master. reference figure 1.6 and section 1.6 for command details. ordering information
MS4515DO MS4515DO www.meas-spec.com april 2012 19/19 north america europe asia measurement specialties 45738 northport loop west fremont, ca 94538 tel: 1-800-767-1888 fax: 1-510-498-1578 sales: pfg.cs.amer@meas-spec.com measurement specialties (europe), ltd. 26 rue des dames 78340 les clayes-sous-bois, france tel: +33 (0) 130 79 33 00 fax: +33 (0) 134 81 03 59 sales: pfg.cs.emea@meas-spec.com measurement specialties (china), ltd. no. 26 langshan road shenzhen high-tech park (north) nanshan district, shenzhen 518057 china tel: +86 755 3330 5088 fax: +86 755 3330 5099 sales: pfg.cs.asia@meas-spec.com the information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for inaccuracies. furthermore, this informati on does not convey to the purchaser of su ch devices any license under the patent right s to the manufacturer. measurement specialties, inc. reserves the right to make changes without further notice to any product herein. me asurement specialties, inc. makes no warranty, repr esentation or guarantee regarding the suitab ility of its product for any particular pu rpose, nor does measurement specialties, inc. assume any liability arising out of the application or use of an y product or circuit and specific ally disclaims any and all liability, including without limitation consequential or incidental damages. typical parameters can and do vary in different applications. all operating parameters must be validated for each cu stomer application by customer ?s technical experts. measure ment specialties, inc. does not convey any license under its patent rights nor the rights of others.

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