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 ELECTRICAL CONNECTION Maximum ratings Supply voltage VS max. 6.50 VDC Output current Sink Source Lead temperature (2 - 4 sec.) Temperature ranges Compensated Operating Storage 4.75 V to 5.25 VDC 2 mA 2 mA 250 °C 6 1 5 RBI 7 2 0 to +85 °C -20 to +105 °C -40 to +125 °C Vibration 10 g at 20 - 2000 Hz Shock RBAP... RBAH... 100 g for 11 ms 50 g for 11 ms 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 +Vs N/C 8 4 N/C SCL SDA 220 nF Vout 15 nF 3 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! 1/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PRESSURE RANGES SPECIFICATIONS (VS = 5.0 VDC, TA = 25°C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) Part number Pressure range Burst pressure1 Sensitivity (typ.) RBIH005DB 0...±5 RBIH010DB 0...±10 RBIH010DU 0...10 3 0.400 328 RBIP015AU 0...15 30 0.267 218 RBIP030AU 0...30 0.133 109 RBIP100AU 0...100 150 0.040 33 RBIP001(G,D)U 0...1 5 4.00 3277 RBIP005(G,D)U 0...5 20 0.80 655 RBIP015(G,D)U 0...15 0.267 218 RBIP030(G,D)U 0...30 60 0.133 RBIP100(G,D)U 0...100 150 0.040 33 RBIP001DB 0...±1 5 2.00 1638 RBIP005DB 0...±5 20 0.40 328 RBIP015DB 0...±15 0.133 109 RBIP030DB 0...±30 60 0.067 55 RBIP100DB 0...±100 150 0.020 16 3 "H2O psi(a) psi(g) psi(d) 3 60 30 30 0.400 p si psi(a) psi(g) psi(d) 0.200 328 V/ "H2O V/psi 164 109 counts/ "H2O counts/ 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. 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 = 25°C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) All RBIH... Characteristics Min. Typ. Total accuracy (0...85 °C)3 6 Temperature effect on offset Sample rate Max. Units ±2.5 %FSS ±100 mV 100 4 2.73 Response delay Quantization step Hz 5 Current consumption 14.11 ms 3 mV 6 mA All RBIH...U (unidirectional devices) Characteristics Min. Typ. Max. 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 Zero pressure offset 0.40 2 0.50 0.60 4.00 Full scale span (FSS) Full scale output 4.40 4.50 V 4.60 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 Zero pressure offset 327 2 410 492 3277 Full scale span (FSS) Full scale output counts 3604 3686 3768 Min. Typ. Max. All RBIH...B (bidirectional devices) Characteristics 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 Zero pressure offset 2.40 Full scale span (FSS)2 Output 2.50 2.60 4.00 at max. specified pressure 4.40 4.50 4.60 at min. specified pressure 0.40 0.50 0.60 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 Zero pressure offset 1966 2 E / 11718 / A 2130 3276 Full scale span (FSS) Output 2048 at max. specified pressure 3604 3686 3768 at min. specified pressure 327 410 492 counts 3/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output PERFORMANCE CHARACTERISTICS (VS = 5.0 VDC, TA = 25°C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS) All RBIP... Characteristics Min. Typ. Total accuracy (0...85°C)3 6 Temperature effect on offset RBIP...GU, ...DU, ...DB Sample rate Max. Units ±2.0 %FSS ±80 mV 100 4 2.73 Response delay Quantization step Hz 5 Current consumption 14.11 ms 3 mV 6 mA All RBIP...U (unidirectional devices) Characteristics Min. Typ. Max. 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 Zero pressure offset 0.42 2 0.50 0.58 4.00 Full scale span (FSS) Full scale output 4.42 4.50 V 4.58 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 Zero pressure offset 347 2 410 473 3276 Full scale span (FSS) Full scale output counts 3624 3686 3750 Min. Typ. Max. All RBIP...B (bidirectional devices) Characteristics 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 Zero pressure offset 2.42 Full scale span (FSS)2 Output 2.50 2.58 4.00 at max. specified pressure 4.42 4.50 4.58 at min. specified pressure 0.42 0.50 0.58 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 Zero pressure offset 1985 2 E / 11718 / A 2111 3276 Full scale span (FSS) Output 2048 at max. specified pressure 3624 3686 3750 at min. specified pressure 347 410 473 counts 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 I²C-bus. 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. 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 RBI is designed to work as a slave, hence it will only respond to requests from a master device. 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. The I²C-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 I²C-bus line. DIGITAL I2C INTERFACE 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). 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. DATA operation: The RBI starts to send 2 data bytes containing the current pressure value placed in the output registers. SCL SDA START condition Data valid 1 S Slave Address R/W A Data allowed to change Data Byte 1 A STOP condition Data Byte 2 S Read out of pressure value generated by master generated by slave Slave Address P Next command S = START condition Data Byte 1 = High Byte (MSB first) A = Acknowledge Data Byte 2 = Low Byte (LSB last) P = STOP condition FIGURE I: I²C-BUS Protocol E / 11718 / A 5/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output I2C INTERFACE PARAMETERS Parameter Symbol 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 Min. Typ. 90 0 (open drain, IOL= -4 mA) (pins SCL and SDA) Max. 100 10 10 20 400 100 5 Unit % of Vs µA pF kHz FSC L --- tBUF 4.7 µs 4.0 4.7 4.0 4.7 0 250 ----4 µs µs µs µs ns ns ns ns µs tHD.STA tLOW tHIGH tSU.STA tHD.DAT tSU.DAT tR tF tSU.STO tSP tSU;DAT Conditions tHD;DAT to first clock pulse 300 300 sp i ke s o n S D A o r S C L of that length are suppressed 50 tSU;STA tHD;STA tR tSU;STO tBUF tHD;STA ns tF SCL SDA tHIGH tLOW SCL SDA 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) High pressure port 2.29 (0.090) 3.38 (0.133) 8.13 8.89 (0.350) (0.320) 8.26 typ (.325 typ) Low pressure port 0.51 typ (0.02 typ) 1.78 (0.070) 2.54 typ (0.100 typ) 16.64 ±0.64 (0.655 ±0.025) 4.5 (0.177) 6.99 (0.275) Gage (G) package 3.15 (0.124) 1.27 typ (0.050 typ) 13.97 (0.550) 16.89 (0.665) 4.9 (0.193) 2 ° typ 1.19 typ (0.047 typ) 2.29 typ (0.090 typ) 2.79 typ (0.11 typ) 8.89 5.08 (0.350) (0.200) 0.51 typ (0.02 typ) 16.64 ±0.64 (0.655 ± 0.025) Absolute (A) package 4.5 (0.177) 2.54 typ (0.100 typ) 16.89 (0.665) 8.46 (0.333) 1.27 typ (0.050 typ) 13.97 (0.550) 2.29 typ (0.090 typ) 8.0 typ (0.315 typ) 8.89 (0.350) 16.64 ±0.64 (0.655 ±0.025) E / 11718 / A 4.5 (0.177) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) third angle projection dimensions in mm (inches) 7/9 www.sensortechnics.com RBI Series Pressure sensors with analog and digital output ELECTRICAL CONNECTIONS RBI...DU, RBI...DB RBI...GU Vs (pin 1) identifier +Vs Vout GND N/C SCL N/C SDA N/C +Vs Vout GND N/C RBI...AU SCL N/C SDA N/C Vs (pin 1) identifier SCL N/C SDA N/C Vs (pin 1) identifier Note: Pins 4, 5, 6, 7 and 8 are internal device connections and should not be connected for any reason! +Vs Vout GND N/C TOTAL ACCURACY (-20 to +105°C) Total accuracy (%FSS) For all RBIP... devices 3.0 2.0 1.0 0 -1.0 -2.0 -3.0 -20 0 20 40 60 85 105 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 Absolute (A) Gage (G) Differential (D) Unidirectional (U) 0...10 inch H2O RBIH010DU 0...1 psi RBIP001GU RBIP001DU 0...5 psi RBIP005GU RBIP005DU 0...15 psi RBIP015AU RBIP015GU RBIP015DU 0...30 psi RBIP030AU RBIP030GU RBIP030DU 0...100 psi RBIP100AU RBIP100GU RBIP100DU Bidirectional (B) 0...±5 inch H2O RBIH005DB 0...±10 inch H2O RBIH010DB 0...±1 psi RBIP001DB 0...±5 psi RBIP005DB 0...±15 psi RBIP015DB 0...±30 psi RBIP030DB 0...±100 psi RBIP100DB 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