a 16035 vineyard blvd. morgan hill, ca 95037 p 408 225 4314 f 408 225 2079 e www.allsensors.com all sensors all sensors all sensors all sensors all sensors all sensors DS-0011 rev a enhanced digital output sensors: extended temperature range digita l output barometer sensors ? medical instrumentation environmental controls meteorology applications all combined errors over temperature less than 0.1%, typical wide -40 to 125 c compensated temperature range electrically compatible to all sensors ga142 series enhanced dual serial interface mode features 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. general description physical dimensions pin label description 1 vcc +5v power supply input 2 data/si data output for synchronous mode. serial in for asynchro- nous mode. 3 clock/so clock output for synchronous mode. serial out for asynchro- nous mode. 4 ready/mode ready output for synchronous mode. selects asynchronous mode when held low during reset. 5 convert/br convert input for synchronous mode. selects one of two baud rates for asynchronous mode (low=9,600, high=19,200). 6 ground ground for power and signals pin descriptions 0.80 (20.3) 0.85 (21.6) 1.10 (27.9) 0 . 10 typical (2.54) a b 1 pin 123456 0.66 (16.0) 0.21 (5.3) 0.42 (10.5) 0.48 (12.2) 0.55 (14.0) 0.174 to 0.190 (4.4 to 4.8) 1.08 (27.4) 0.25 (6.4) pin size 0.010 x 0.020 (0.25 x 0.50) notes: 1) dimensions in inches (millimeters) pr essur e applied to por t b
barometer digital output pressure sensors absolute maximum ratings operating voltage compensated temperature operating temperature storage temperature humidity limits +4.75vdc to +5.25vdc -40c to +125 c -40 to +125 c -40 to 150 c 0 to 95% rh (non condensing) environmental specifications supply voltage (vcc) voltage on any pin with respect to gnd lead temperature (soldering 2-4 sec.) 7vdc -0.6 to vcc+0.6v 250c nominal -- 8 8 1.0 -- minimum 12 -- -- -- -- parameter (1) resolution conversion speed supply current overall accuracy (5) long term drift (one year) maximum -- 16 12 2.5 2.0 units bit ms ma mbar mbar general performance characteristics standard pressure ranges operating pressure 600 to 1100 20 to 32 600 to 1100 20 to 32 proof pressure 60 psi 60 psi burst pressure 120 psi 120 psi 120 psi 120 psi part number baro-do-mil baro-inhg-do-mil baro-do-mil-pcb baro-inhg-do-mil-pcb digital span (4) 3 3 3 3 units mbar inches hg mbar inches hg specification notes note 1: u nless otherwise specified , all parameters are measured at 5.0 volt supply , positive pressure applied to p ort b. note 2: t he digital output is a 16 bit signed binary output in a two ? s compliment format . t he applied pressure is computed using the p ressure c onversion t able ( below ). t he m ode column identifies the resolution operating mode of the device (a = s tandard resolution , b = h igh resolution ). fso and u nits are shown for each model . note 3: s hift is within the first hour of excitation applied to the device . note 4: d igital s pan is dependent on the resolution operating mode . r efer to the d igital s pan t able ( below ) to identify the digital span of the specific model . i n 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 d igital s pan to indicate the condition . note 5: o verall accuracy includes the combined effects of offset and span shifts over temperature , linearity , hysteresis , and offset and span calibration . pressure conversion table 10,000 pout = digital output x fso x units 32,767 pout = digital output x fso x units pressure output equation mode s h digital span table -10,399 to 10,399 -399 to 10,399 mode s (standard) mode h (high res) -32,767 to 32,766 -999 to 32,766 span 1 2 5,054 to 10,399 17,501 to 32,766 3 60 psi 60 psi bit 0 : part not compensated bit 1 : tdex overflow bit 2 : tdex over-range bit 3 : pdex overflow bit 4 : pdex over-range bit 5 : pwl overflow bit 6 : scaling overflow bit 7 : high resolution overflow bit 8 : pressure output limited to specified value bit 9 through bit 15 : reserved error code table (asynchronous mode)
a 16035 vineyard blvd. morgan hill, ca 95037 p 408 225 4314 f 408 225 2079 e www.allsensors.com all sensors all sensors all sensors all sensors all sensors all sensors DS-0011 rev a optional 90 degree lead bend synchronous communications typical synchronous communications configuration (compatible with all sensors ga142 series digital output sensors). typical configurations asynchronous communications typical asynchronous communications configuration. the mode pin is interrogated at power up and if tied low, will cause the sensor to enter asynchronous communications mode. this mode supports multiple sensors by addressable commands. the convert/ br pin then serves to select one of two available baud rates. option: pcb mounted compatible to ga-series and smrt series host system sensor conv er t /br ready /mode clock /so data /si host system sensor (1) sensor (n) convert / br ready/ mode clock/ so data/ si convert / br ready/ mode clock/ so data/ si
barometer digital output pressure sensors 16-mar-03 asynchronous command summary (1,2) command rd rm ro rp rr rs wd wo u description read mode setting read model information read user offset setting read pressure read device pressure range read serial number write mode setting (?s? = standard, ?h? = high resolution) write user offset setting select unique part for following command (for multidrop configurations). response rd= rm= ro= rp= rr= rs= wd= wo= u 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 n ational s emiconductor . asynchronous command notes note 1: a ll commands and responses are in ascii character format and are terminated by a c arriage r eturn (c arriage r eturns are not shown in command and response table ). e xample : t he r ead h igh r esolution p ressure command ( represented by : rh< cr >) is given by the follo wing three byte sequence : 0 x 52 0 x 48 0 x 0d note 2: is a four byte ascii string representing a 16- bit signed value . e xample : rh=2b7d represents the response of an rh command with the pressure output of 0 x 2b7d (11,133 decimal ) value . note 3: < llll > is a four byte ascii string representing the low resolution output ( similar to the high resolution response of n ote 2) note 4: is a 16- bit error code . t he representation is four byte ascii string ( expressing a double - byte or 16- bits ). a ? no error ? condition is expressed as ?0000? where an error is expressed by setting an individual bit of the error word and presenting it in ascii hex format . note 5: { null } is a null response ( no response ). t he intent utility of the command is to apply this command in a multidrop configuration ( bussed configuration ) and simulaneously capture the pressure of all of the devices on the buss . t he captured readings can subsequently be read using the u command (s elect u nique p art ) inconjunction with the rc command . e xample : urc< cr >
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