DIGITAL OUTPUT PRESSURE SENSORS Enhanced Digital Output Sensors Features • 5” H O to 100psi Pressure Ranges 2 • All Combined Errors Over Temperature Less Than 0.1%, Typical • Wide -20 to 85°C Compensated Temperature Range • Electrically Compatible to All Sensors GA142 Series • Enhanced Dual Serial Interface Mode Applications • Medical Instrumentation • Environmental Controls • HVAC • Meteorology General Description The Digital Output pressure sensors are based upon a proprietary surface mapping technology to produce a fully digital output that virtually eliminates all repeatable errors over temperature and pressure. This series provides a 12 bit digital serial output (14 bit in High Resolution Mode) with superior offset, span and linearity characteristics. The output is SPI and ® MICROWIRE/PLUS compatible as well as fully compatible with the All Sensors GA142 Series sensors. In addition to synchronous communications, the Digital Output pressure sensors incorporates a bi-directional, TTL level, asynchronous serial interfaces mode (hardware selectable 9,600 or 19,200 baud). This mode includes a command set that allows the host to interrogate the sensor for model information, pressure range, serial number, pressure units and conversion factor. The command set also allows the host to select a high resolution output mode, make minor adjustments to offset and has an addressable feature that alows multiple sensors to be tied to the same interface buss. This series is intended for use with non-corrosive, non-ionic working fluids such as air, dry gases and the like. All signals are 5V TTL/CMOS compatible. Physical Dimensions Pin Descriptions Pin Label Description Pin Size 0.25 0.10 Typical 1 Vcc +5V power supply input 0.010 x 0.020 (6.4) (2.54) (0.25 x 0.50) 2 Data/SI Data output for synchronous Pin 1 2 3 4 5 6 0.174 to 0.190 mode. Serial in for asynchro- (4.4 to 4.8) nous mode. 0.21 1 (5.3) 3 Clock/SO Clock output for synchronous mode. Serial out for asynchro- 0.414 A nous mode. (10.5) 1.08 (27.4) 4 Ready/Mode Ready output for synchronous 0.63 mode. Selects asynchronous B (16.0) mode when held low during reset. 5 Convert/BR Convert input for synchronous 0.48 0.55 0.80 mode. Selects one of two (12.2) (14.0) (20.3) baud rates for asynchronous NOTES: 0.85 mode (low=9,600, 1) Dimensions in inches (millimeters) (21.6) high=19,200). 1.10 (27.9) 6 Ground Ground for power and signals all sensors 01 a 6296 Sa n Ignacio, Suite E & F, San Jose, CA 95119 p 408 225 4314 f 408 225 2079 e w ww.allsensors.c om all sensors Absolute Maximum Ratings Environmental Specifications Supply Voltage (Vcc) 7Vdc Operating Voltage +4.75Vdc to +5.25Vdc Voltage on Any Pin with Respect to Gnd -0.6 to Vcc+0.6V Compensated Temperature -20° C to +85° C Common-mode pressure 50 psig Operating Temperature -25 to +90° C Lead Temperature (soldering 2-4 sec.) 250°C Storage Temperature -40 to 125° C Humidity Limits 0 to 95% RH (non condensing) Standard Pressure Ranges (2) (4) Units FSO Digital Span Part Number Operating Pressure Proof Pressure Burst Pressure inH2O 5 1 5 INCH-D-DO -5 to 5 200 inH2O 300 inH2O 10 INCH-D-DO -10 to 10 inH2O 10 1 200 inH2O 300 inH2O inH2O 20 1 20 INCH-D-DO -20 to 20 200 inH2O 500 inH2O 30 INCH-D-DO -30 to 30 inH2O 30 1 200 inH2O 800 inH2O 1 PSI-D-DO -1 to 1 PSI 1 1 5 PSI 15 PSI PSI 5 1 5 PSI-D-DO -5 to 5 10 PSI 30 PSI 15 PSI-D-DO -15 to 15 PSI 15 1 60 PSI 120 PSI 15 PSI-A-DO 0 to 15 PSIA 15 2 60 PSI 120 PSI mBar 1100 3 BARO-DO 600 to 1100 60 PSI 120 PSI 30 PSI-G-DO 0 to 30 PSI 30 2 90 PSI 150 PSI 30 PSI-A-DO 0 to 30 PSIA 30 2 90 PSI 150 PSI PSI 100 2 100 PSI-G-DO 0 to 100 200 PSI 250 PSI 100 PSI-A-DO 0 to 100 PSIA 100 2 200 PSI 250 PSI General Performance Characteristics (All Models) (1) Parameter Minimum Nominal Maximum Units Resolution -- Bit 12 -- Conversion Speed -- 8 16 mS Supply Current -- 8 12 mA Performance Characteristics for 5 INCH-D-DO (1) Parameter Minimum Nominal Maximum Units (5) Overall Accuracy -- 0.25 0.5 %FSO Long Term Drift (one year) -- -- 0.5 %FSO Offset Position Sensitivity (1g) -- -- 0.05 %FSO (3) Offset Warm-up Shift -- -- 0.25 %FSO Performance Characteristics for 10 INCH-D-DO, 20 INCH-D-DO and 30 INCH-D-DO (1) Parameter Minimum Nominal Maximum Units (5) Overall Accuracy -- 0.25 0.5 %FSO Long Term Drift (one year) -- -- 0.5 %FSO Offset Position Sensitivity (1g) -- -- 0.03 %FSO (3) Offset Warm-up Shift -- -- 0.25 %FSO 02 digital output pressure sensors Performance Characteristics for 10 INCH-D-DO, 20 INCH-D-DO and 30 INCH-D-DO (1) Parameter Minimum Nominal Maximum Units (5) Overall Accuracy -- 0.25 0.5 %FSO Long Term Drift (one year) -- -- 0.5 %FSO Offset Position Sensitivity (1g) -- -- 0.03 %FSO (3) Offset Warm-up Shift -- -- 0.25 %FSO Performance Characteristics for BARO-DO (1) Parameter Minimum Nominal Maximum Units (5) Overall Accuracy -- 1.0 2.5 mBar Long Term Drift (one year) -- -- 2.0 mBar Performance Characteristics for 1 PSI-D-DO through 100 PSI-A-DO (except BARO-DO) (1) Parameter Minimum Nominal Maximum Units (5) Overall Accuracy 0.25 %FSO -- 0.10 Long Term Drift (one year) -- -- 0.25 %FSO Specification Notes NOTE 1: UNLESS OTHERWISE SPECIFIED, ALL PARAMETERS ARE MEASURED AT 5.0 VOLT SUPPLY, POSITIVE PRESSURE APPLIED TO PORT B. NOTE 2: THE DIGITAL OUTPUT IS A 16 BIT SIGNED BINARY OUTPUT IN A TWO’S COMPLIMENT FORMAT. THE APPLIED PRESSURE IS COMPUTED USING THE PRESSURE CONVERSION TABLE (BELOW). THE MODE COLUMN IDENTIFIES THE RESOLUTION OPERATING MODE OF THE DEVICE (A = STANDARD RESOLUTION, B = HIGH RESOLUTION). FSO AND UNITS ARE SHOWN FOR EACH MODEL. NOTE 3: SHIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE. NOTE 4: DIGITAL SPAN IS DEPENDENT ON THE RESOLUTION OPERATING MODE. REFER TO THE DIGITAL SPAN TABLE (BELOW) TO IDENTIFY THE DIGITAL SPAN OF THE SPECIFIC MODEL. IN THE EVENT OF AN OVER-PRESSURE OR UNDER-PRESSURE CONDITION, THE DIGITAL OUTPUT WILL ONE COUNT HIGHER OR ONE COUNT LOWER (RESPECTIVELY) TO THE LISTED DIGITAL SPAN TO INDICATE THE CONDITION. NOTE 5: OVERALL ACCURACY INCLUDES THE COMBINED EFFECTS OF OFFSET AND SPAN SHIFTS OVER TEMPERATURE, LINEARITY, HYSTERESIS, AND OFFSET AND SPAN CALIBRATION. Digital Span Table Pressure Conversion Table Span Mode S (Standard) Mode H (High Res) Mode Pressure Output Equation 1 -10,399 to 10,399 -32,767 to 32,766 FSO · Units æ ö S P_Out Digital_Out · ç ÷ 10,000 2 -399 to 10,399 -999 to 32,766 è ø 3 5,054 to 10,399 17,501 to 32,766 FSO · Units æ ö H P_Out Digital_Out · ç ÷ 32,767 è ø Typical Configurations Synchronous Communications Asynchronous Communications Typical synchronous communications Typical asynchronous communications Sensor (1) Clock/SO configuration (compatible with All configuration. The Mode pin is Host Data/SI System Sensors GA142 Series Digital Output interrogated at power up and if tied Convert/BR Ready/Mode Sensors). low, will cause the sensor to enter asynchronous communications mode. Host Sensor Sensor (n) This mode supports multiple sensors by System Clock/SO Clock/SO addressable commands. The Convert/ Data/SI Data/SI Convert/BR Convert/BR BR pin then serves to select one of two Ready/Mode Ready/Mode available baud rates. all sensors a 6296 Sa n Ignacio, Suite E & F, San Jose, CA 95119 p 408 225 4314 f 408 225 2079 e w ww.allsensors.c om all sensors (1,2) Asynchronous Command Summary Command Description Response RD Read Mode Setting RD= RM Read Model Information RM= RO Read User Offset Setting RO= RP Read Pressure RP= RR Read Device Pressure Range RR= RS Read Serial Number RS= WD Write Mode Setting (“S” = Standard, “H” = High Resolution) WD= WO Write User Offset Setting WO= U Select Unique Part for following command (for multidrop U configurations). Asynchronous Command Notes NOTE 1: ALL COMMANDS AND RESPONSES ARE IN ASCII CHARACTER FORMAT AND ARE TERMINATED BY A CARRIAGE RETURN (CARRIAGE RETURNS ARE NOT SHOWN IN COMMAND AND RESPONSE TABLE). EXAMPLE: THE READ PRESSURE COMMAND (REPRESENTED BY: RP) IS GIVEN BY THE FOLLOWING THREE BYTE SEQUENCE: 0X52 0X50 0X0D NOTE 2: IS A FOUR BYTE ASCII STRING REPRESENTING A 16-BIT SIGNED VALUE. EXAMPLE: P=2B7D REPRESENTS THE RESPONSE OF AN RP COMMAND WITH THE PRESSURE OUTPUT OF 0X2B7D (11,133 DECIMAL) VALUE. Synchronous Timing Diagram (Note: Asynchronous mode timing is per RS-232) READY [Output] t1 t10 t2 t2 CONVERT [Input] t3 t4 t8 t9 t5 CLOCK [Output] t6 t7 DATA [Output] Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB LSB Ref Parameter Min Typ Max Units Ref Parameter Min Typ Max Units t1 Conversion Time -- 8 16 msec t6 Data Setup Time -- 3 -- usec t2 Ready to Convert 0 -- -- usec t7 Data Hold Time -- 3 -- usec t3 Convert to Clock 24 32 39 usec t8 Interbyte Delay -- 57 -- usec t4 Clock Period -- 16 -- usec t9 Clock to Ready -- 14 -- usec t5 Clock High Time -- 8 -- usec t10 Data Transmission -- 335 -- usec All Sensors reserves the right to make changes to any products herein. All Sensors 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. ® MICROWIRE/PLUS IS A REGISTERED TRADEMARK OF NATIONAL SEMICONDUCTOR. digital output pressure sensors 04 24-Jun-02