rev. 18 jan 2005 vti technologies reserves the right to modify this speci? cation without prior to notice. vout(@vx) x r e = 100% x vout(@ 5 v) 5.00 v vx 1- SCA1000 and sca1020 series accelerometer features ? 2-axis measurement: SCA1000 for x - y measurement and sca1020 for z - y measurement ? available range 1.7 g ? interchangeable with sca610/sca620 (see interchangeability drawing below) ? over damped sensing element to control frequency response ? smd dil-12 lead-free component ? compatible with lead-free re? ow soldering process ? advanced internal and external connection failure detection ? digitally activated electrostatic self-test ? continuous memory parity check ? single +5 v supply; two ratiometric analog voltage outputs ? serial peripheral interface (spi) compatible digital output (11 bits) ? internal temperature sensor, accessible via spi benefits ? excellent reliability and stability over time and temperature ? high resolution and low noise ? wide operating temperature range ? outstanding overload and shock durability applications ? 2-axis acceleration measurements ? 2-axis platform leveling ? inclination based position measurement ? 360 vertical orientation measurement note 1 100 nf supply by-pass capacitor is needed. note 2 measuring directions in parallel to mounting plane, arrows showing positive acceleration direction. note 3 zero point speci? ed as voffset = vout(0 g) [ v ]. see note 12. note 4 sensitivity speci? ed as vsens = {vout(+1 g) - vout(-1 g)}/2 [ v/g ]. see note 12. note 5 zero point error speci? ed as zero point error = {vout(0 g) C vdd/2} / vsens [ g ] vsens = nominal sensitivity vdd/2 = nominal offset. note 6 sensitivity error speci? ed as sensitivity error = { [vout(+1 g)-vout(-1 g)] / 2 - vsens_nom} / vsens_nom x 100 % [% ] vsens_nom = nominal sensitivity see note 12. note 7 from straight line through +1 g and -1 g points. note 8 the output has true dc (0 hz) response. note 9 the ratiometric error is speci? ed as: note 10 the cross-axis sensitivity determines how much acceleration, perpendicular to the measuring axis, couples to the output. the total crossaxis sensitivity is the geometric sum of the sensitivities of the two axis which are perpendicular to the measuring axis. the angular alignment error between channels 1 and 2 is included into the cross axis error. note 11 typical ? gure. in addition, supply voltage noise couples to the output due to the ratiometric nature of the accelerometer. note 12 measuring directions. for customized product, please contact vti technologies electrical characteristics parameter condition min typ. max units supply voltage vdd (1 4.75 5.0 5.25 v current consumption vdd = 5 v; no load 5 ma analog resistive output load vout to vdd or vss 10 kohm analog capacitive output load 20 nf digital output load @ 500 khz 1 nf spi clock frequency 500 khz ad conversion time 150 s data transfer time @500 khz clock 38 s performance characteristics parameter condition SCA1000-d01 sca1020-d02 units measuring range (2 nominal 1.7 1.7 g measuring direction relative to mounting plane (12 see note 12. x= parellel y =parallel z= perpendicular y= parallel zero point (3,12 mounting position vdd/2 vdd/2 v sensitivity (4,12 @ room temperature 1.2 1.2 v/g zero point error over temperature (5 -2585 c typical 70 70 mg -40125 c 100 100 mg sensitivity error over temperature (6 -2585 c typical 3 3% -40125 c 4 4% typical non-linearity (7 over measuring range 20 20 mg cross-axis sensitivity (10 @ room temperature 3.5 3.5 % frequency response C3db (8 @ -40125 c 50 30 hz 50 30 hz hz ratiometric error (9 vdd = 4.75...5.25 v 2 2 % output noise density (11 from dc...100 hz 80 80 g/ hz digital output resolution fs 11 11 bits vdd = 5.00v, unless otherwise specified preliminary free datasheet http:///
dimensions pcb pad layouts the accelerometer weighs < 1.2 g. the size of the part is approximately (w x h x l) 9 x 5 x 16 mm. pin pitch is standard 100 mils. acceleration in the direction of the arrow will increase the output voltage. SCA1000 and sca1020 series absolute maximum ratings parameter value unit acceleration (powered or non powered) 20 000 g supply voltage -0.3 v to +5.5 v v voltage at input/output pins -0.3 v to (vdd+0.3 v) v storage temperature range -55125 c measuring directions x: +1 g position y: 0 g position x: 0 g position y: 0 g position x: 0 g position y: +1 g position x: 0 g position y: 0 g position x: -1 g position y: 0 g position x: 0 g position y: -1 g position z: +1 g position y: 0 g position z: 0 g position y: 0 g position z: 0 g position y: +1 g position z: 0 g position y: 0 g position z: -1 g position y: 0 g position z: 0 g position y: -1 g position SCA1000 ( x - y con? guration) sca1020 ( z - y con? guration) sensing direction part number serial number free datasheet http:///
vti technologies oy myllynkivenkuja 6 p.o. box 27 fi-01621 vantaa finland tel. +358 9 879 181 fax +358 9 879 18791 sales@vti.? vti technologies oy frankfurt branch rennbahnstr. 72-74 d-60528 frankfurt am main germany tel. +49 69 6786 880 fax +49 69 6786 8829 sales.de@vti.? vti technologies, inc. one park lane blvd. suite 804 - east tower dearborn, mi 48126 usa tel. +1 313 425 0850 fax +1 313 425 0860 sales@vtitechnologies.com electrical connection recommended circuit pin# pin name i/o connection 1 sck input serial clock 2 nc factory only 3 miso output master in slave out; data output 4 mosi input master out slave in; data input 5 out_2 output channel 2 output (y-axis) 6 vss power negative supply voltage (vss) 7 csb input chip select (active low) 8 nc factory only 9 st_2 input self test input for channel 2 10 st_1 input self test input for channel 1 11 out_1 output channel 1 output (x or z-axis) 12 vdd power positive supply voltage (vdd) self test can be activated applying logic 1 (positive supply voltage level) to st pin (pin 9 and 10). if st feature is not used pins 9 and 10 must be left ? oating or connected to gnd. when SCA1000 / 1020 is used in analog mode and the pcb is designed correctly the sca610 / 620 and SCA1000 / 1020 are interchangeable. if the pcb layout is designed for SCA1000 /1020, then sca610 / 620 can be used for single axis applications. the output of sca610 / 620 corresponds to the output of channel 1 in the SCA1000 / 1020. interchangeability with sca610 / sca620 SCA1000 and sca1020 series free datasheet http:///
|
