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-0010 rev a enhanced digital output sensors: industrial temperature range digital output barometer sensors ? medical instrumentation ? environmental controls ? meteorology applications ? 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 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 -20c to +85 c -20 to +105 c -40 to 125 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 0.025 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 proof pressure 60 psi 60 psi burst pressure 120 psi 120 psi part number baro-do baro-inhg-do digital span (4) 3 3 units 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 .
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-0010 rev a 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 communica- tions mode. this mode supports multiple sensors by addressable commands. the convert/br pin then serves to select one of two available baud rates. host system sensor convert /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 synchronous timing diagram (note: asynchronous mode timing is per rs-232. to use rs-232 requires the maxim ma232 interface circuit for proper voltage level compatibility.) t1 t3 t2 t10 t2 t9 t4 t8 t6 t7 bit 15 msb bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 lsb t5 ready [output] convert [input] clock [output] data [output] ref parameter min typ max units t1 conversion time -- 8 16 msec t2 ready to convert 0 -- -- usec t3 convert to clock 24 32 39 usec t4 clock period -- 24 -- usec t5 clock high time -- 12 -- usec ref parameter min typ max units t6 data setup time -- 3 -- usec t7 data hold time -- 3 -- usec t8 interbyte delay -- 70 -- usec t9 clock to ready -- 14 -- usec t10 data transmission -- 476 -- usec
barometer digital output pressure sensors 16-mar-03 16-mar-03 command summary table: command description response ra read accuracy string ra=[accuracy string] rc read captured pressure rc=[hhhh][eeee] rh read high resolution pressure rh=[hhhh][eeee] rl read low resolution pressure rl[llll][eeee] rm read model rm=[model string] rr read pressure range rr=[pressure range string] rs read serial number rs=[ s/n string] rt read temperature rt=[temperature range string] u[s/n string][command] unique command for matching s/n u[s/n string],sp>[response string] for non-matching s/n {null} wc capture pressure {null} notations: <> indicates a single ascii character [] indicates an ascii string {} text within the braces describes the response (this is essentially a comment) ?? text within quotes represents a literal ascii text string definitions: term name description carriage return ascii carrage return. this is a command/response delimiter space ascii space character [accuracy string] accuracy string part accuracy string. given in % full scale output. example: 0.250 %fso notes: 1.) there is a space between the numeric accuracy ?0.250? and units ?%fso.? 2.) fso stands for full scale output (full scale output is determined by the pressure range string.) [hhhh] h igh resolution output this is a four character ascii string representing a hexidecimal value. example: 3f7c represents an output count of 16,252 note: the output is forced to ?8000? upon an error. except error bit 8, see error bit codes. [llll] low resolution output this is a four character ascii string representing a hexidecimal value. example: 1d58 represents an output count of 7,512 note: the output is forced to ?8000? upon an error. except error bit 8, see error bit codes. [model string] model string part model as given in the data sheet (also order number.) the general model syntax is [full scale pressure][pressure units]-[pressure model]-do example: 100 psi-d-do where: full scale pressure=100 pressure units=psi (inh2o, mbar or mmhg available) do represents digital output notes: 1.) exception to this syntax is the barometer. 2.) custom models may be different.
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-0010 rev a 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 . definitions: term name description [pressure range string] pressure range string this is the compensated pressure range of the part. syntax: [low limit]?to?[high limit][units}[mode] esample: 20 to 32 mmhga where: low limit = 20 high limit = 32 units = mmhg mode = a (absolute pressure) (d differential and g gage pressure also available.) [response string] a fully formed response string example: ?rl=1e430000 [s/n string] serial number string ymdd-nn-bspp (12 character string) where: y : year (0~9) m : month (a~m, excluding i) dd: day of month nn: lot (lot sequence for a given day) b : lot batch# (a~z) s : test oven slot# (1~5) p : position on slot (1~15) example: 3d23-03-a103 april 23, 2003 3rd lot of the day batch a, slot 1, position 03 this allows traceability to original test data [temperature range string] temperature range string this is the compensated temperature range of the part. syntax: [low limit][high limit]?c? example: -20 to 85 c -40 to 125 c and custom ranges also available. [eeee] error codes the error codes are bits packed within a double byte. the four character string is an ascii hex expression. the error code bits are: bit 0 : part not factory 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 : scale overflow bit 7 : high resolution overflow bit 8 : pressure output limited to specific value bits 9 through 15 : reserved example: 0100 represents erro bit 8 set and the pressure output limited notes: bit 0 : this should not appear if the part has been calibrated bits 1 thru 7 : indicate computational error when compensated bit 8: indicates that the pressure applied to the part exceeds the range of the part and is limit to either the high or low limit {null} null response no response from the part. in the event of a serial number mismatch the part will not respond (to avoid buss contention.) month codes january : a february : b march : c april : d may : e june : f july : g august : h september : j october : k november : l december : m
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