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| RBI Series Pressure sensors with analog and digital output FEATURES * 0...10 inch H2O to 0...100 psi, 0...5 inch H2O to 0...100 psi, absolute, gage or differential pressure * 0.5...4.5 V analog output and digital readout via I2C-bus * Precision ASIC signal conditioning * Temperature compensated * 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 max. 6.50 VDC Output current Sink Source Lead temperature (2 - 4 sec.) Temperature ranges Compensated Operating Storage Vibration Shock RBAP... RBAH... 4.75 V to 5.25 VDC ELECTRICAL CONNECTION +Vs N/C 2 mA 2 mA 250 C 0 to +85 C -20 to +105 C -40 to +125 C 10 g at 20 - 2000 Hz 100 g for 11 ms 50 g for 11 ms 6 1 5 SCL SDA Vout 15 nF 220 nF RBI 84 3 7 2 N/C GND Note: Capacitor 220 nF required between +Vs and GND and 15 nF between Vout and GND. It is important to place the capacitors as close to the pins as possible! Pins 4, 6 and 8 are internal device connections and should not be connected for any reason! Caution! The sensors are 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 / 11718 / A 1/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PRESSURE RANGES SPECIFICATIONS (VS = 5.0 VDC, TA = 25C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) Part number RBIH005DB RBIH010DB RBIH010DU RBIP015AU RBIP030AU RBIP100AU RBIP001(G,D)U RBIP005(G,D)U RBIP015(G,D)U RBIP030(G,D)U RBIP100(G,D)U RBIP001DB RBIP005DB RBIP015DB RBIP030DB RBIP100DB Pressure range Burst pressure1 0...5 0...10 0...10 0...15 0...30 0...100 0...1 0...5 0...15 0...30 0...100 0...1 0...5 0...15 0...30 0...100 psi(d) psi(g) psi(a) "H2O 3 3 3 30 60 150 5 20 30 60 150 5 20 30 60 150 psi(d) psi(g) psi(a) p si 0.400 0.200 0.400 0.267 0.133 0.040 4.00 0.80 0.267 0.133 0.040 2.00 0.40 0.133 0.067 0.020 Sensitivity (typ.) 328 V/ "H2O 164 328 218 109 33 3277 655 218 V/psi 109 33 1638 328 109 55 16 counts/ p si counts/ "H2O 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. Delay time between sampling and signal change at the output. 5. The smallest change in the output voltage, given any change in pressure. 6. This is the maximum temperature shift for offset when measured between 0...85 C relative to the 25 C reading. E / 11718 / A 2/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PERFORMANCE CHARACTERISTICS (VS = 5.0 VDC, TA = 25C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) All RBIH... Characteristics Total accuracy (0...85 C)3 Temperature effect on offset Sample rate Response delay 4 5 6 Min. Typ. Max. 2.5 100 Units %FSS mV Hz ms mV mA 100 2.73 3 6 14.11 Quantization step Current consumption All RBIH...U (unidirectional devices) Characteristics Zero pressure offset Full scale span (FSS) Full scale output Zero pressure offset Full scale span (FSS) Full scale output 2 2 Min. 0.40 4.40 327 3604 Typ. 0.50 4.00 4.50 410 3277 3686 Max. 0.60 Units 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 V 4.60 492 counts 3768 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 All RBIH...B (bidirectional devices) Characteristics Zero pressure offset Full scale span (FSS)2 Output at max. specified pressure at min. specified pressure Zero pressure offset Full scale span (FSS) Output 2 Min. 2.40 4.40 0.40 1966 Typ. 2.50 4.00 4.50 0.50 2048 3276 3686 410 Max. 2.60 4.60 0.60 2130 3768 492 Units 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 V 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 at max. specified pressure at min. specified pressure 3604 327 counts E / 11718 / A 3/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PERFORMANCE CHARACTERISTICS (VS = 5.0 VDC, TA = 25C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) All RBIP... Characteristics Total accuracy (0...85C)3 Temperature effect on offset Sample rate Response delay 4 5 6 Min. Typ. Max. 2.0 80 Units %FSS mV Hz ms mV mA RBIP...GU, ...DU, ...DB 100 2.73 3 6 14.11 Quantization step Current consumption All RBIP...U (unidirectional devices) Characteristics Zero pressure offset Full scale span (FSS) Full scale output Zero pressure offset Full scale span (FSS) Full scale output 2 2 Min. 0.42 4.42 347 3624 Typ. 0.50 4.00 4.50 410 3276 3686 Max. 0.58 Units 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 V 4.58 473 counts 3750 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 All RBIP...B (bidirectional devices) Characteristics Zero pressure offset Full scale span (FSS)2 Output at max. specified pressure at min. specified pressure Zero pressure offset Full scale span (FSS) Output 2 Min. 2.42 4.42 0.42 1985 Typ. 2.50 4.00 4.50 0.50 2048 3276 3686 410 Max. 2.58 4.58 0.58 2111 3750 473 Units 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 V 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 at max. specified pressure at min. specified pressure 3624 347 counts E / 11718 / A 4/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output INTRODUCTION The RBI 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 IC-bus. According to the IC-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 RBI is designed to work as a slave, hence it will only respond to requests from a master device. The IC-bus master-slave concept requires a unique address for each device. The RBI has a hard coded slave address (1111000xb), therefore it is not possible to access more than one RBI on the same IC-bus line. 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 transmitted 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 purpose. When acknowledge is missed, slave transmitter becomes inactive. It is on master either to send last command 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 condition, the master has to transmit the slave address for the RBI with a READ command: $F1. The RBI must not be accessed with a WRITE command ($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 RBI starts to send 2 data bytes containing the current pressure value placed in the output registers. DIGITAL I2C INTERFACE The RBI 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 condition. START conditions are always generated by the master. Each request for the current pressure value must be initiated with a START. SCL SDA START condition Data valid Data allowed to change STOP condition 1 S Slave Address R/W A Data Byte 1 A Data Byte 2 S Slave Address Next command P Read out of pressure value 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) FIGURE I: IC-BUS Protocol E / 11718 / A 5/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output I2C INTERFACE PARAMETERS Parameter Input high level Input low level Output low level Pull up current Load capacitance SDA SCL clock frequency Bus free time between STOP and START condition Hold time (repeated) START condition LOW period of SCL HIGH period of SCL Setup time repeated START condition Data hold time Data setup time Rise time of both SDA and SCL Fall time of both SDA and SCL Setup time for STOP condition Input filter spike suppression Symbol Conditions Min. 90 0 Typ. Max. 100 10 10 20 400 100 Unit % of Vs A pF kHz s s s s s ns ns ns ns s ns (open drain, IOL= -4 mA) (pins SCL and SDA) FSC L tBUF tHD.STA tLOW tHIGH tSU.STA tHD.DAT tSU.DAT tR tF tSU.STO tSP to first clock pulse 5 --4.7 4.0 4.7 4.0 4.7 0 250 ----4 300 300 sp i ke s o n S D A o r S C L of that length are suppressed 50 tSU;DAT SCL SDA tHD;DAT tSU;STA tHD;STA tR tF tHIGH SCL SDA tLOW tSU;STO tBUF tHD;STA FIGURE II: Timing characteristics of the I2C interface E / 11718 / A 6/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PHYSICAL DIMENSIONS Differential (D) package 1.27 typ (0.050 typ) 16.89 (0.665) 7.87 typ (0.310 typ) 13.97 (0.550) 3.63 (0.143) 8.13 8.89 (0.350) (0.320) 1.78 (0.070) 16.64 0.64 (0.655 0.025) 2.29 (0.090) High pressure port Low pressure port 3.38 (0.133) 8.26 typ (.325 typ) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) 4.5 (0.177) Gage (G) package 6.99 (0.275) 3.15 (0.124) 1.27 typ (0.050 typ) 13.97 (0.550) 2 typ 16.89 (0.665) 4.9 (0.193) 2.29 typ (0.090 typ) 2.79 typ (0.11 typ) 1.19 typ (0.047 typ) 8.89 5.08 (0.350) (0.200) 16.64 0.64 (0.655 0.025) 0.51 typ (0.02 typ) 4.5 (0.177) 2.54 typ (0.100 typ) Absolute (A) package 1.27 typ (0.050 typ) 13.97 (0.550) 16.89 (0.665) 8.46 (0.333) 2.29 typ (0.090 typ) 8.0 typ (0.315 typ) 8.89 (0.350) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) 16.64 0.64 (0.655 0.025) 4.5 (0.177) third angle projection dimensions in mm (inches) 7/9 E / 11718 / A www.sensortechnics.com RBI Series Pressure sensors with analog and digital output ELECTRICAL CONNECTIONS RBI...DU, RBI...DB Vs (pin 1) identifier RBI...GU Vs (pin 1) identifier SCL N/C SDA N/C +Vs Vout GND N/C +Vs Vout GND N/C SCL N/C SDA N/C RBI...AU Vs (pin 1) identifier SCL N/C SDA N/C +Vs Vout GND N/C Note: Pins 4, 5, 6, 7 and 8 are internal device connections and should not be connected for any reason! TOTAL ACCURACY (-20 to +105C) For all RBIP... devices 3.0 2.0 1.0 0 -1.0 -2.0 -3.0 -20 0 20 40 60 85 105 Total accuracy (%FSS) Temperature (C) E / 11718 / A 8/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output ORDERING INFORMATION - AVAILABLE LISTINGS Note: Preferred listings are highlighted in grey Pressure range Unidirectional (U) 0...10 inch H2O 0...1 psi 0...5 psi 0...15 psi 0...30 psi 0...100 psi Absolute (A) Gage (G) Differential (D) RBIH010DU RBIP001GU RBIP005GU RBIP015AU RBIP030AU RBIP100AU RBIP015GU RBIP030GU RBIP100GU RBIP001DU RBIP005DU RBIP015DU RBIP030DU RBIP100DU RBIH005DB RBIH010DB RBIP001DB RBIP005DB RBIP015DB RBIP030DB RBIP100DB Bidirectional (B) 0...5 inch H2O 0...10 inch H2O 0...1 psi 0...5 psi 0...15 psi 0...30 psi 0...100 psi Sensortechnics PRO services: * Extended guarantee period of 2 years * Improved performance characteristics * 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 / 11718 / A 9/9 www.sensortechnics.com |
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