RCE Series Digital pressure sensors FEATURES · 0...±10 mbar to 0...5 bar, 0...±4 inch H2O to 0...100 psi, absolute, gage or differential pressure · Barometric pressure ranges · SPI bus and analog output · Precision ASIC conditioning · Calibrated and temperature compensated · Total accuracy ±1.0 %FSS · Sensortechnics PRO services MEDIA COMPATIBILITY To be used with non-corrosive, non-ionic working fluids such as clean dry air, dry gases and the like. SPECIFICATIONS ELECTRICAL CONNECTION Maximum ratings Supply voltage VS Output current Sink Source Maximum pressure on any port6 4.75 V to 5.25 VDC max. 6.50 VDC 1 mA 1 mA 10 bar Lead specifications Average preheating temperature gradient 2.5 K/s Soak time ca. 3 min Time above 217°C 50 s Time above 230°C 40 s Time above 250°C 15 s Peak temperature 260°C Cooling temperature gradient -3.5 K/s Temperature ranges Compensated Operating Storage 0 to +85 °C -10 to +85 °C -20 to +105 °C Bottom view 6 5 4 3 2 1 CLK Vout SS GND +Vs MISO Pin 1 marked by dot Note: MOSI is internally connected to high level. No external port is available. 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. E / 11716 / A 1/7 www.sensortechnics.com RCE Series Digital pressure sensors PRESSURE RANGES SPECIFICATIONS Part number Pressure range Burst pressure1 RCE0611AR RCEM025DU RCEM050DU RCEM100DU RCEM250DU RCEM500DU RCEB001(A,D)U RCEB002(A,D)U RCEB005(A,D)U RCEM010DB RCEM025DB RCEM050DB RCEM100DB RCEM250DB RCEM500DB RCEB001DB RCE1216AR RCEH010DU RCEP001DU RCEP005DU RCEP015(A,D)U RCEP030(A,D)U RCEP100(A,D)U RCEH004DB RCEH010DB RCEP001DB RCEP005DB RCEP015DB 600...1100 mbar 0...25 mbar 0...50 mbar 0...100 mbar 0...250 mbar 0...500 mbar 0...1 bar 0...2 bar 0...5 bar 0...±10 mbar 0...±25 mbar 0...±50 mbar 0...±100 mbar 0...±250 mbar 0...±500 mbar 0...±1 bar 12...16 psi 0...10 inch H2O 0...1 psi 0...5 psi 0...15 psi 0...30 psi 0...100 psi 0...±4 inch H2O 0...±10 inch H2O 0...±1 psi 0...±5 psi 0...±15 psi 2 bar 0.2 bar 0.35 bar 0.35 bar 1 bar 1 bar 2 bar 5 bar 10 bar 0.2 bar 0.2 bar 0.35 bar 0.35 bar 1 bar 1 bar 2 bar 3 0 p si 3 p si 5 p si 1 5 p si 3 0 p si 7 0 p si 1 5 0 p si 3 p si 3 p si 5 p si 1 5 p si 3 0 p si 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. Full Scale Span (FSS) 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. Max. delay time between pressure change at the pressure die and signal change at the output. 5. The response time depends on the adjusted internal A/D resolution of the sensor. For 12 bit it is typ. 0.5 ms. Other A/D resolutions and reponse times are available on request. Please contact Sensortechnics for further information. 6. Maximum pressure on any port is the maximum operating plus common-mode pressure for differential pressure devices which can be applied without damaging the sensor. Common Mode Pressure is the pressure applied to both sides of the diaphragm simultaneously. E / 11716 / A 2/7 www.sensortechnics.com RCE Series Digital pressure sensors PERFORMANCE CHARACTERISTICS (Vs = 5.0 V, TA = 25 °C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) All devices Characteristics Min. Typ. Total accuracy (0 ... 85°C)3 Response delay4,5 Max. Units ±1.0 %FSS 0.5 5 A/D resolution ms 12 D/A resolution 11 Current consumption (no load) 5 bi t mA All RCE...(U,R) Characteristics Min. Typ. Max. Units D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC S Offset at lowest specified pressure 1700 2 2000 2300 30000 Full scale span (FSS) Full scale output 31700 32000 counts 32300 A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC S Offset at lowest specified pressure 0.26 0.31 4.84 4.88 4.93 Min. Typ. Max. 2 0.35 4.58 Full scale span (FSS) Full scale output V All RCE...B Characteristics Units D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC S Zero pressure offset 16700 2 17300 30000 Full scale span (FSS) Output 17000 at max. specified pressure 31700 32000 32300 at min. specified pressure 1700 2000 2300 counts A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC S Zero pressure offset 2.55 2 E / 11716 / A 2.64 4.58 Full scale span (FSS) Output 2.59 at max. specified pressure 4.84 4.88 4.93 at min. specified pressure 0.26 0.31 0.35 V 3/7 www.sensortechnics.com RCE Series Digital pressure sensors SPI - SERIAL PERIPHERAL INTERFACE In general the RCE series supports all combinations of clock phase (CPHA) and polarity (CPOL). By default it is programmed to CPHA = 0 and CPOL = 0, which means that data transmission starts with the rising first clock edge (see Fig 1). Introduction The RCE is capable to generate a digital output signal. The device runs a cyclic program, which will store a corrected sensor value with 12-bit resolution about every 250 µs within the output registers of the internal ASIC. This cyclic program runs independent from the bus communication. In order to use the RCE pressure sensor for digital signal readout, it should be connected to a SPI Master device. Slave select The falling edge of the SS line indicates the beginning of the transfer. Additionally the SS line must not be negated and reasserted between the three bytes to be transmitted. SPI specifies four signals: The clock (CLK) is generated by the master and input to all slaves. MOSI carries data from master to slave. MISO carries data from slave back to master. A slave select line (SS) allows individual selection of a slave device. Data operation The MOSI is internally connected to high level. So there is no data transmission from master to slave. Because of internal configuration the slave will answer the first byte with an FFxh. The second and third byte contain the 15 bit pressure information (see Fig. 2). SPI Modes A pair of parameters called clock polarity (CPOL) and clock phase (CPHA) determine the edges of the clock signal on which the data are driven and sampled. Each of the two parameters has two possible states, which allows for four possible combinations, all of which are incompatible with one another. SCK cycle 1 2 3 For further information please refer to Sensortechnics SPI bus application note 4 5 6 7 8 SCK (CPOL=0) MOSI MSB MISO LSB MSB LSB SS Sampling Fig. 1: Example of a standard 1 byte SPI data transfer for CPHA=0 and CPOL=0 Data Byte 1 Data Byte 2 1 1 1 1 1 Data Byte 3 MOSI 1 1 1 1 1 1 1 1 1 MISO X X X X X X X X X P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 1 1 1 1 1 1 1 1 1 1 Relevant data Fig. 2: 3 byte data stream between RCE sensor and master containing the pressure value as a 15 bit information E / 11716 / A 4/7 www.sensortechnics.com RCE Series Digital pressure sensors SPI - SERIAL PERIPHERAL INTERFACE (cont.) Interface parameters Parameter Symbol Min. Typ. Max. Input high level 90 100 Input low level 0 10 Output low level Unit % of V s 10 Pull-up resistor Ω 500 Load capacitance @ MISO CMISO 400 Input capacitance @ each pin CSPI_IN 10 fSCK 100* MISO hold time after SCK sample slope tSPI_HD_MISO 200 MOSI setup time before SCK sample slope tSPI_SU_MOSI 2/fCLK tSPI_SU_SS 10 Signal clock frequency /SS setup time before SCK sample slope 640 pF kHz ns ns * recommended Note: Sensortechnics recommends communication speeds of at least 100 kHz (max. 640 kHz). Please contact your nearest Sensortechnics sales office for further information. t SPI_SU_SS t SPI_SU_MOSI t SCK (CPOL=0) SPI_HD_MISO MOSI MISO SS Fig. 3: Timing characteristics E / 11716 / A 5/7 www.sensortechnics.com RCE Series Digital pressure sensors PHYSICAL DIMENSIONS 1.10 ref (27.9 ref 0.85 (21.6) 0.80 (20.3) 1.03 ref (26.2) ref 0.55 (14.0) 0.36 (9.1) 0.190 (4.8) 2 pls 1.08 (27.4) 0.41 (10.4) Ø 0.14 (3.6) thru rivet mounting holes 1 2 3 4 5 6 0.05 (1.3) 0.25 (6.4) 0.020 (0.51) x 0.01 (0.25) pins 6 pls Ø 0.08 (2.0) pressure port B 0.42 (10.7) 0.20 (5.1) R0.13 (R3.3) typ 0.10 (2.5) pin spacing Port B: High pressure Port for gage and differential devices Port A: High pressure Port for absolute devices Ø 0.08 (2.0) pressure port A 0.05 (1.3) third angle projection dimensions in inches (mm) E / 11716 / A 6/7 www.sensortechnics.com RCE Series Digital pressure sensors ORDERING INFORMATION Series Options RCE Pressure range 0611* Pressure mode 600...1100 mbar M010** 10 mbar M025 25 mbar M050 50 mbar M100 100 mbar M250 250 mbar M500 500 mbar B 001 1 bar B002*** 2 bar B005*** 5 bar 1216* 12...16 psi H004** 4 inch H2O H 010 10 inch H2O P 001 1 p si P 005 5 p si P 015 1 5 p si P030*** 3 0 p si P100*** 1 0 0 p si Calibration A* Absolute B Bidirectional D Differential/Gage U Unidirectional R Barometric * only available as barometric devices * only available from ** only available as bidirectional 1 bar/15 psi and for devices barometric ranges *** only available as unidirectional devices Example: RCE M025 D B Sensortechnics PRO services: · Extended guarantee period of 2 years · Custom product modifications and adaptations even for small quantities · Advanced logistics models for supply inventory and short delivery times · Technical support through application engineers on the phone or at your site · Fastest possible technical response for design and QA engineers ... plus other services on request 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. E / 11716 / A 7/7 www.sensortechnics.com