DSDX015A2R SENSORTECHNICS | Alldatasheet

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Technical content

Digital pressure transducers 1/8February 2009 / 545 www.sensortechnics.com

FEATURES

  • Absolute, gage or differential pressure
  • Digital readout via I2C-bus
  • Precision ASIC conditioning
  • Temperature compensated
  • Non-ratiometric output GENERAL DESCRIPTION The DSDX series offers a digital interface on a very cost-effective basis. This family is fully calibrated and temperature compen-sated using an on-board ASIC. These sensors are intended for use with non-corrosive, non-ionic working fluids such as air and dry gases. Devices are available to measure absolute, differential, and gage pressures from 1 to 100 psi. The absolute devices have an internal vacuum reference and an output signal proportional to absolute pressure. Differential devices allow application of pressure to either side of the sensing diaphragm and can be used for gage or differential measurements. All DSDX devices are accurate to with- in ±2.0 %FSS for all gage and absolute devices. The devices are characterized for operation from a single 5 V supply. The sensor is de- signed and manufactured according to standards laid down in ISO 9001. ELECTRICAL CONNECTION

APPLICATIONS

  • Medical instrumentation
  • Barometry
  • HVAC controls
  • Pneumatic controls Note: A capacitor of 220 nF is required between +Vs and GND. Pin 2 is an internal device connection and should be connected to ground with a 15 nF capacitor. It is important to place thecapacitors as close to the pins aspossible! Pins 4, 6 and 8 are internal device connections and should not be connected for any reason! +Vs SCL SDA IC GND 8 4 3 220 nF 15 nF DSDX N/C N/C

Digital pressure transducers 2/8February 2009 / 545 www.sensortechnics.com PRESSURE RANGES SPECIFICATIONS (VS = 5.0 VDC , TA = 25°C) PRESSURE SENSOR CHARACTERISTICS Maximum ratings Supply voltage VS 4.75 to 5.25 VDC max. 6.50 VDC Lead temperature (2 - 4 sec.) 250°C Environmental specifications Temperature ranges Compensated 0 to +85°C Operating -20 to +105°C Storage -40 to +125°C Vibration: 10 g at 20 - 2000 Hz Shock: 100 g for 11 ms rebmuntraPe gnarerusserPe russerptsruB 1 ).pyt(ytivitisneS R2A510XDSD5 1ot0 )a(isp )a(isp 812 /stnuoc isp R2A030XDSD0 3ot00 69 01 R2A001XDSD0 01ot00 513 3 R4D/R2G100XDSD1 ot0 )d,g(isp )d,g(isp 7723 R4D/R2G500XDSD5 ot00 25 56 R4D/R2G510XDSD5 1ot00 38 12 R4D/R2G030XDSD0 3ot00 69 01 R4D/R2G001XDSD0 01ot00 513 3 D4D100XDSD1 ±ot05 8 361 D4D500XDSD5 ±ot00 28 23 D4D510XDSD5 1±ot00 39 01 D4D030XDSD0 3±ot00 65 5 D4D001XDSD0 01±ot00 516 1 Caution! The sensor is not reverse polarity protected. Incorrect applications of excitation voltage or ground to the wrong pin can cause electrical failure. Application of supply voltage above the maximum can cause electrical failure.

Digital pressure transducers 3/8February 2009 / 545 www.sensortechnics.com scitsiretcarahC. niM. pyT. xaMt inU tesffoerusserporeZ7 430 143 74 stnuoc)SSF(napselacslluF 2 6723 tuptuoelacslluF4 2636 8630 573 )C°58ot0(ycaruccalatoT 3 0.2±S SF% etarelpmaS0 01z H yaledesnopseR 4 37.21 1.41 sm )tluserts1otpurewop(emitputratS 04 petsnoitazitnauQ 5 3s tnuoc noitpmusnoctnerruC 6A m PERFORMANCE CHARACTERISTICS The output signal is not ratiometric to the supply voltage (VS = 5.0 VDC , TA = 25°C) scitsiretcarahC. niM. pyT. xaMt inU tesffoerusserporeZ5 8918 4021 112 stnuoc )SSF(napselacslluF 2 6723 tuptuOe russerpdeificeps.xamta4 2636 8630 573 erusserpdeificeps.nimta7 430 143 74 )C°58ot0(ycaruccalatoT 3 0.2±S SF% etarelpmaS0 01z H yaledesnopseR 4 37.21 1.41 sm )tluserts1otpurewop(emitputratS 04 petsnoitazitnauQ 5 3s tnuoc noitpmusnoctnerruC 6A m All DSDX...R All DSDX...D

Digital pressure transducers 4/8February 2009 / 545 www.sensortechnics.com Specification notes: 1. If maximum burst pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may fracture. 2. Span is the algebraic difference between the output signal for the highest and lowest specified pressure. 3. Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature effects. Linearity is the measured deviation based on a straight line. Hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. Calibration errors include the deviation of offset and full scale from nominal values. 4. Delay time between sampling and signal change at the output. 5. The smallest change in the output voltage, given any change in pressure. TOTAL ACCURACY (-20 TO +105°C) -20 0 20 40 60 85 105 Temperature (°C) Total accuracy (%FSS) -1.0 -2.0 -3.0 3.0 2.0 1.0

Digital pressure transducers 5/8February 2009 / 545 www.sensortechnics.com INTRODUCTION The DSDX is capable to generate a digital output signal. It runs a cyclic program, which will store a corrected 12-bit sensor value about every 10 ms within the output registers of the internal ASIC. In order to use the pressure transducer for digital signal readout, the device should be connected to a bidirectional I²C-bus. According to the I²C-bus communication specification, the bus is controlled by a master device, which generates the clock signal, controls the bus access and generates START and STOP conditions. The DSDX is designed to work as a slave, hence it will only respond to requests from a master device. The I²C-bus master-slave concept requires a unique address for each device. The DSDX has a hard coded slave address (1111000xb), therefore it is not possible to access more than one DSDX on the same I²C-bus line. DIGITAL I2C INTERFACE The DSDX complies with the following protocol (FIGURE I): Bus not busy: During idle periods both data line (SDA) and clock line (SCL) remain HIGH. START condition (S): HIGH to LOW transition of SDA line while clock (SCL) is HIGH is interpreted as START con- dition. START conditions are always generated by the master. Each request for the current pressure value must be initiated with a START. STOP condition (P): LOW to HIGH transition of SDA line while clock (SCL) is HIGH determines STOP condition. STOP conditions are always generated by the master. More than one request for the current pressure value can be trans- mitted without generation of intermediate STOP condition. DATA valid (D): State of data line represents valid data when, after START condition, data line is stable for duration of HIGH period of clock signal. Data on line must be changed during LOW period of clock signal. There is one clock pulse per bit of data. Acknowledge (A): Data is transferred in pieces of 8 bits (1 byte) on serial bus, MSB first. After each byte receiving device – whether master or slave – is obliged to pull data line LOW as acknowledge for reception of data. Master must generate an extra clock pulse for this pur- pose. When acknowledge is missed, slave transmitter becomes inactive. It is on master either to send last com- mand again or to generate STOP condition in that case. Slave address: Each device connected to the bus has a unique slave address. After generating a START con- dition, the master has to transmit the slave address for the DSDX with a READ command: $F1. The DSDX must not be accessed with a WRITE command ($F0) as the correct function of the device can not be guaranteed in this case (note: a power-down power-up change will force the sensor to use factory data again). DATA operation: The DSDX starts to send 2 data bytes containing the current pressure value placed in the output registers. FIGURE I: I²C-BUS Protocol of DSDX SDA SCL START condition Data valid Data allowed to change STOP condition R/WS Data Byte 1 A Data Byte 2Slave Address A S PSlave Address generated by master generated by slave S = START condition A = Acknowledge P = STOP condition Data Byte 1 = High Byte (MSB first) Data Byte 2 = Low Byte (LSB last) Read out of pressure value Next command

Digital pressure transducers 6/8February 2009 / 545 www.sensortechnics.com I2C INTERFACE PARAMETERS retemaraPl obmySs noitidnoC. niM. pyT. xaMt inU levelhgihtupnI 090 01 fo% sVlevelwoltupnI 00 1 levelwoltuptuO) Am4-=LOI,niardnepo(0 1 tnerrucpulluP) ADSdnaLCSsnip(5 0 2A µ ADSecnaticapacdaoL 004F p ycneuqerfkcolcLCS F LCS ---0 01z Hk neewtebemiteerfsuB noitidnocTRATSdnaPOTS t FUB 7.4s µ )detaeper(emitdloH noitidnocTRATS t ATS.DH eslupkcolctsrifot0 .4s µ LCSfodoirepWOL t WOL 7.4s µ LCSfodoirepHGIH t HGIH 0.4s µ detaeperemitputeS noitidnocTRATS t ATS.US 7.4s µ emitdlohataD t TAD.DH 0s n emitputesataD t TAD.US 052s n htobfoemitesiR LCSdnaADS tR ---0 03s n htobfoemitllaF LCSdnaADS tF ---0 03s n rofemitputeS noitidnocPOTS t OTS.US 4s µ ekipsretliftupnI noisserppus tPS foLCSroADSnosekips desserppuserahtgneltaht 05s n FIGURE II: Timing characteristics of the I2C interface tHD;STA tSU;DAT tHD;DAT tSU;STA tR tF SCL SDA tHIGH tLOW tSU;STO tBUF tHD;STA SDA SCL

Digital pressure transducers 7/8February 2009 / 545 www.sensortechnics.com PHYSICAL DIMENSIONS D4 package G2 package A2 package third angle projection dimensions in mm (inches) 16.89 (0.665) 1.27 typ (0.050 typ) 13.97 (0.550) 16.64 ±0.64 (0.655 ±0.025) 8.89 (0.350) 7.87 typ (0.310 typ) 4.5 (0.177) 2.54 typ (0.100 typ) 8.26 typ (.325 typ) 1.78 (0.070) 3.63 (0.143) 3.38 (0.133) 8.13 (0.320) 0.51 typ (0.02 typ) Low pressure port High pressure port 2.29 (0.090) 4.5 (0.177) 16.64 ±0.64 (0.655 ±0.025) 16.89 (0.665)1.27 typ (0.050 typ) 13.97 (0.550) 8.89 (0.350) 8.0 typ (0.315 typ) 2.29 typ (0.090 typ) 8.46 (0.333) 2.54 typ (0.100 typ) 0.51 typ (0.02 typ) 2 ° typ 16.89 (0.665) 1.27 typ (0.050 typ) 13.97 (0.550) 3.15 (0.124) 4.9 (0.193) 16.64 ±0.64 (0.655 ± 0.025) 8.89 (0.350)5.08 (0.200) 2.29 typ (0.090 typ) 4.5 (0.177) 2.54 typ (0.100 typ) 0.51 typ (0.02 typ) 6.99 (0.275) 1.19 typ (0.047 typ) 2.79 typ (0.11 typ)

Digital pressure transducers 8/8February 2009 / 545 www.sensortechnics.com Sensortechnics reserves the right to make changes to any products herein. Sensortechnics does not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. egnarerusserPe tulosbAe gaGe gaG/laitnereffiD isp1ot0R 2G100XDSDR 4D100XDSD isp5ot0R 2G500XDSDR 4D500XDSD isp51ot0R 2A510XDSDR 2G510XDSDR 4D510XDSD isp03ot0R 2A030XDSDR 2G030XDSDR 4D030XDSD isp001ot0R 2A001XDSDR 2G001XDSDR 4D001XDSD isp1±ot0 D4D100XDSD isp5±ot0 D4D500XDSD isp51±ot0 D4D510XDSD isp03±ot0 D4D030XDSD isp001±ot0 D4D001XDSD

ORDERING INFORMATION

Other pressure ranges or calibrations are available on request ELECTRICAL CONNECTIONS DSDX...A2R Note: Pins 4, 6 and 8 are internal device connections and should not be connected for any reason. Pin 2 is an internal device connection and should be connected to ground with a 15 nF capacitor. Vs (pin 1) identifier Vs (pin 1) identifier Vs (pin 1) identifier SCL N/C SDA N/C SCL N/C SDA N/C SCL N/C SDA N/C +Vs IC GND N/C +Vs IC GND N/C +Vs IC GND N/C