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| 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 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 ELECTRICAL CONNECTION Bottom view Lead specifications Average preheating temperature gradient 2.5 K/s Soak time ca. 3 min Time above 217C 50 s Time above 230C 40 s Time above 250C 15 s Peak temperature 260C Cooling temperature gradient -3.5 K/s Temperature ranges Compensated Operating Storage Caution! 0 to +85 C -10 to +85 C -20 to +105 C 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. 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 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 Pressure range 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 Burst pressure1 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 Total accuracy (0 ... 85C)3 Response delay4,5 A/D resolution D/A resolution 5 Min. Typ. 0.5 12 Max. 1.0 Units %FSS ms 11 bi t Current consumption (no load) 5 mA All RCE...(U,R) Characteristics Offset at lowest specified pressure Full scale span (FSS) Full scale output Offset at lowest specified pressure Full scale span (FSS) Full scale output 2 2 Min. 1700 31700 0.26 4.84 Typ. 2000 30000 32000 0.31 4.58 4.88 Max. 2300 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 counts 32300 0.35 V 4.93 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 All RCE...B Characteristics Zero pressure offset Full scale span (FSS) Output 2 Min. 16700 Typ. 17000 30000 32000 2000 2.59 4.58 4.88 0.31 Max. 17300 32300 2300 2.64 4.93 0.35 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 at max. specified pressure at min. specified pressure 31700 1700 2.55 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 Full scale span (FSS) Output 2 at max. specified pressure at min. specified pressure 4.84 0.26 V E / 11716 / A 3/7 www.sensortechnics.com RCE Series Digital pressure sensors SPI - SERIAL PERIPHERAL INTERFACE 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 s 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. 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. 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). 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. 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. For further information please refer to Sensortechnics SPI bus application note SCK cycle SCK (CPOL=0) MOSI MISO SS Sampling Fig. 1: 1 2 3 4 5 6 7 8 MSB LSB MSB LSB Example of a standard 1 byte SPI data transfer for CPHA=0 and CPOL=0 Data Byte 1 MOSI MISO 1 X 1 X 1 X 1 X 1 X 1 X 1 X 1 X 1 1 Data Byte 2 1 1 1 1 1 1 1 1 Data Byte 3 1 1 1 1 1 1 X P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0 Relevant data Fig. 2: 3 byte data stream between RCE sensor and master containing the pressure value as a 15 bit information 4/7 E / 11716 / A www.sensortechnics.com RCE Series Digital pressure sensors SPI - SERIAL PERIPHERAL INTERFACE (cont.) Interface parameters Parameter Input high level Input low level Output low level Pull-up resistor Load capacitance @ MISO Input capacitance @ each pin Signal clock frequency MISO hold time after SCK sample slope MOSI setup time before SCK sample slope /SS setup time before SCK sample slope CMISO CSPI_IN fSCK tSPI_HD_MISO tSPI_SU_MOSI tSPI_SU_SS 100* 200 2/fCLK 10 ns 500 400 10 640 Symbol Min. 90 0 Typ. Max. 100 10 10 Unit % of V s pF kHz 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 SCK (CPOL=0) SPI_SU_MOSI t 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) 1.08 (27.4) 0.41 (10.4) O 0.14 (3.6) thru rivet mounting holes 0.25 (6.4) 0.020 (0.51) x 0.01 (0.25) pins 6 pls 0.05 (1.3) 0.190 (4.8) 2 pls 123456 O 0.08 (2.0) pressure port B Port B: High pressure Port for gage and differential devices Port A: High pressure Port for absolute devices 0.42 (10.7) R0.13 (R3.3) typ 0.20 (5.1) 0.10 (2.5) pin spacing O 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* M010** M025 M050 M100 M250 M500 B 001 B002*** B005*** 1216* H004** H 010 P 001 P 005 P 015 P030*** P100*** 600...1100 mbar 10 mbar 25 mbar 50 mbar 100 mbar 250 mbar 500 mbar 1 bar 2 bar 5 bar 12...16 psi 4 inch H2O 10 inch H2O 1 p si 5 p si 1 5 p si 3 0 p si 1 0 0 p si A* D Pressure mode Absolute Differential/Gage B U R Calibration Bidirectional Unidirectional 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 |
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