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| DSDX Series A-grade Digital pressure transducers FEATURES * 0...1 to 0...100 psi, 0...1 to 0...15 psi * Absolute, gage or differential pressure * Digital readout via I2C-bus * Precision ASIC conditioning * Temperature compensated * Non-ratiometric output * Total accuracy 0.5 to 1.0 %FSS SPECIFICATIONS Maximum ratings ELECTRICAL CONNECTION N/C Supply voltage VS Lead temperature (2 - 4 sec.) Temperature ranges Compensated Operating Storage Vibration Shock 4.75 V to 5.25 VDC max. 6.50 VDC 6 1 5 DSDX A-grade +Vs 250C SCL SDA IC 15 nF 220 nF 0 to +85C -20 to +105C -40 to +125C 10 g at 20 - 2000 Hz 100 g for 11 ms 7 2 84 3 GND N/C 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 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 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. February 2009 / 611 1/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers PRESSURE RANGES SPECIFICATIONS (VS = 5.0 VDC, TA = 25C) Part number DSDX015A2R-A DSDX030A2R-A DSDX100A2R-A DSDX001G2R-A / D4R-A DSDX005G2R-A / D4R-A DSDX015G2R-A / D4R-A DSDX030G2R-A / D4R-A DSDX100G2R-A / D4R-A DSDX001D4D-A DSDX005D4D-A DSDX015D4D-A Pressure range 0 to 15 0 to 30 0 to 100 0 to 1 0 to 5 0 to 15 0 to 30 0 to 100 0 to 1 0 to 5 0 to 15 psi(g,d) psi(a) Burst pressure1 30 60 150 5 20 30 60 150 5 20 30 psi(g,d) psi(a) Sensitivity (typ.) 218 109 33 3277 655 218 109 33 1638 328 109 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. 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. February 2009 / 611 2/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers PERFORMANCE CHARACTERISTICS The output signal is not ratiometric to the supply voltage (VS = 5.0 VDC, TA = 25C) All DSDX...R-A Characteristics Zero pressure offset Full scale span (FSS) Full scale output Total accuracy (0 to 85C) Sample rate Response delay4 Startup time (power up to 1st result) Quantization step5 Current consumption 3 2 Min. DSDX001... all others DSDX001... all others DSDX001... all others 100 2.73 378 394 3654 3670 Typ. 410 410 3276 3686 3686 Max. 442 426 Units counts 3718 3702 1.0 0.5 14.11 40 %FSS Hz ms counts mA 2 6 All DSDX...D-A Characteristics Zero pressure offset Full scale span (FSS)2 Output at max. specified pressure at min. specified pressure Total accuracy (0 to 85C) Sample rate Response delay4 Startup time (power up to 1st result) Quantization step5 Current consumption 3 Min. DSDX001... all others DSDX001... all others DSDX001... all others DSDX001... all others 100 2.73 2016 2032 3654 3670 378 394 Typ. 2048 2048 3276 3686 3686 410 410 Max. 2080 2064 3718 3702 442 426 1.0 0.5 14.11 40 Units counts %FSS Hz ms counts mA 2 6 February 2009 / 611 3/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers 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 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 DSDX 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 DSDX has a hard coded slave address (1111000xb), therefore it is not possible to access more than one DSDX 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 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. 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 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 of DSDX February 2009 / 611 4/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers 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 (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 sp i ke s o n S D A o r S C L o f that length are suppressed to first clock pulse 5 --4.7 4.0 4.7 4.0 4.7 0 250 ----4 300 300 ns ns s 50 ns 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 February 2009 / 611 5/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers PHYSICAL DIMENSIONS D4 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) G2 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) A2 package 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) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) 16.89 (0.665) 8.46 (0.333) 16.64 0.64 (0.655 0.025) 4.5 (0.177) third angle projection February 2009 / 611 dimensions in mm (inches) 6/7 www.sensortechnics.com DSDX Series A-grade Digital pressure transducers ELECTRICAL CONNECTIONS DSDX...D4... Vs (pin 1) identifier Vs (pin 1) identifier DSDX...G2R-A SCL N/C SDA N/C +Vs IC GND N/C +Vs IC GND N/C SCL N/C SDA N/C DSDX...A2R-A Vs (pin 1) identifier 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. SCL N/C SDA N/C +Vs IC GND N/C ORDERING INFORMATION Pressure range 0 to 1 psi 0 to 5 psi 0 to 15 psi 0 to 30 psi 0 to 100 psi 0 to 1 psi 0 to 5 psi 0 to 15 psi DSDX015A2R-A DSDX030A2R-A DSDX100A2R-A Absolute Gage DSDX001G2R-A DSDX005G2R-A DSDX015G2R-A DSDX030G2R-A DSDX100G2R-A Differential/Gage DSDX001D4R-A DSDX005D4R-A DSDX015D4R-A DSDX030D4R-A DSDX100D4R-A DSDX001D4D-A DSDX005D4D-A DSDX015D4D-A Other pressure ranges or calibrations are available 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. February 2009 / 611 7/7 www.sensortechnics.com |
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