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preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec triaxial 2g/ 10g accelerometer SMB365 k ey f eatures - three-axis accelerometer - switchable g-range (2g/10g) - standard smd package: qfn 4.0x4.0 mm 2 footprint, 1.2mm height - 4mg resolution at 50hz bandwidth - ultra-low power asic: 600 a at v dd 2.5v - spi interface - interrupt feature for mobile wake-up or zero-g detection (free fall) - full self-test capability - rohs lead-free compliant - based on automotive-proven bosch silicon surface micromachining process t ypical a pplications tilt, motion and vibration sensing in - cell phones - handhelds - computer peripherals - man-machine interfaces - virtual reality - games g eneral d escript ion the SMB365 is a triaxial low-g acceleration sensor for consumer market applications. it allows measurements of static as well as dynamic acce lerations. due to its three perpendicular axes it gives the absolute orientation in a gravity field. as all other bosch inertial sensors, it is a two- chip arrangement. an application-specific ic evaluates the output of a three-channel microme- chanical acceleration-sensing element that works according to the differential capacitance prin- ciple. the underlying micromachining process has proven its capability in more than 100 million bosch accelerometers and gyroscopes so far. the SMB365 provides a digital 10bit output signal via an spi interface. with an appropriate spi command the full measurement range can be chosen to 2g or 10g. a first-order filter with a pole-frequency of 50hz is included to provide preconditioning of the measured acceleration signal. typical noise level and quantization lead to a sensitivity resolution of 4mg or an accuracy of 0.3 in an inclination sensing application, respectively. the current consumption is typically 600 a at a supply voltage of 2.5v. furthermore, the sensor can be switched into a low-power mode where it informs the host system about an acceleration change via an interrupt pin. this feature can be used to wake-up the host system from a sleep mode. the sensor also features full self-test capability. it is activated via spi command which results in a physical deflection of the seismic mass in the sensing element due to an electrostatic force. thus, it provides full testing of the complete signal evaluation path including the micromachined sensor structure and the evaluation asic. the sensor is available in a standard smd qfn package with a footprint of 4x4mm 2 and a height of 1.2mm. rev. 1.2 page 1 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec t able of c ontents 1 specificat ion .................................................................................................................. ................. 3 2 absolute maxi mum rat ings....................................................................................................... 4 3 spi inte rface .................................................................................................................. ................. 5 3.1 spi s pecification .......................................................................................................................... 5 3.2 spi p rotocol ............................................................................................................................... .6 3.3 spi t iming ............................................................................................................................... ....... 7 4 memory ......................................................................................................................... ..................... 8 4.1 eeprom ......................................................................................................................... ............... 8 4.1.1 regis t er ar ithmetic ............................................................................................................ ..... 8 4.2 g lo bal m emo r y m apping .............................................................................................................. 9 5 operation ...................................................................................................................... ................. 10 5.1 g eneral d escriptio n .................................................................................................................. 10 5.2 o peratio n m o d es and s ensitivity r eso lutio n .......................................................................... 10 5.3 i nterrupt f eature (l ow p ow e r m ode ) ..................................................................................... 11 5.4 a cceleration d ata f orma t ........................................................................................................ 13 5.5 s elf t est ............................................................................................................................... ...... 13 5.6 p ola r ity of the a cceleration o utput ...................................................................................... 14 5.7 p in c onfigura tion ...................................................................................................................... 15 5.8 c onnecting d iagram ................................................................................................................... 16 5.9 h andling i nstruction ................................................................................................................ 17 6 packag e ........................................................................................................................ .................. 17 6.1 o utline d imensio n s ..................................................................................................................... 17 6.2 m arking ............................................................................................................................... ........ 19 6.3 m oisture s ensitivity l evel and s oldering ............................................................................... 19 6.4 r o hs c ompliancy ....................................................................................................................... 19 7 disclaimer ..................................................................................................................... ................. 20 7.1 e ngineering s amples .................................................................................................................. 20 7.2 l imiting values ............................................................................................................................ 20 7.3 l ife suppo rt - and auto mo tive applicatio ns .............................................................................. 20 rev. 1.2 page 2 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 1 specification p a r a m e t e r s y m b o l c o n d i t i o n m i n ty p m a x u n i t s o perating r ang e g fs2g 2 g acceleration range g fs10g switchable via spi command 1 0 g supply voltage analog v dda 2 . 3 2 . 5 3 . 6 v supply voltage digital v ddd only for spi i/o; v ddd v dda 1 . 6 1 . 8 3 . 6 v supply current in normal mode i dd digital and analog 6 0 0 a supply current in low-power mode i ddlpm digital and analog 5 0 0 a supply current in standby mode i ddsbm digital and analog 5 a operating temperature t a - 4 0 + 8 5 c o utput s ignal s 2g g-range 2g 240 256 272 lsb/g sensitivity s 10g g-range 10g 47 51 55 lsb/g zero-g offset 2 o f f t a =25c, v ddd = 2 . 5 v 1 0 lsb zero-g offset temperature drift tco -15c t a +55c 0 . 5 l s b / k ratiometric i ty error 3 rat_off offs et drift vs . v dda 3 0 l s b / v b a n d w i d t h f -3db 1 st order filter 25 50 75 hz nonlinearity nl best fit straight line 0.5 %fs 2g xy 300 2g z 150 10g xy 60 self test response tst activated via spi 10g z 30 lsb output noise n rms r m s 1 lsb rev. 1.2 page 3 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec m echanical c haracteristics cross a x is sensitivity s relative contribution between 3 axes 0 . 2 % alignment error a relative to package outline 0 . 5 2 absolute maximum ratings p a r a m e t e r c o n d i t i o n m i n m a x u n i t s supply voltage v ddd and v dda - 0 . 3 3 . 6 v storage temperature range - 5 0 + 1 5 0 c duration 50 s 1 0 , 0 0 0 g duration 1.0ms 2,000 g mechanical shock free fall onto hard surfaces 1 . 5 m hbm, at any pin 2 kv esd c d m 5 0 0 v rev. 1.2 page 4 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 3 spi interface - 16-bit spi protocol (mode 3) - clock frequency up to 8mhz - 1 read/write bit (r/w=0 for writing, r/w=1 for reading) - 7 address bits - 8 data bits - the most significant bit (msb) is tr ansferred first during address and data phases. - the data acquisition by the sensor occurs at the rising edge of sck. - the output data provided by the sensor is synchronized with the falling edges of sck. - the csb input has a 120k ? pull-up resistor to v ddd . the spi is used for regular reading of the accele ration signal coded on 10 bits. periodically, an update of the digitalized temperature is also available (see the timing diagrams for a detailed description). for a complete readout of the acceleration, two successive read cycles are required because a maximum of 8 bits is readable within a cycle. a 10-bit coded signal is split into 7 msb and 3 lsb. the spi interface is also used for the eeprom progr amming/reading. due to finite access time, the read cycle of an eeprom byte needs two spi cycles , in order to keep the standard protocol. 3.1 spi specification p a r a m e t e r s y m b o l c o n d i t i o n m i n ty p m a x u n i t s clock input frequency f spi 0 . 5 8 m h z capacitive load (miso) c spi v ddd minimum 25 pf input-low level v il_spi 0 . 3 * v ddd v input-high level v ih_spi 0 . 7 * v ddd v hysteresis of the inputs v hy st _spi 0 . 1 * v ddd v csb pull-up resistor r csb 7 0 1 2 0 1 9 0 k ? rev. 1.2 page 5 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 3.2 spi protocol the used protocol corresponds to the standard spi mode 3. s p i me mo r y w r it e c y c l e d e sc r i p t i o n cs b sc k mo s i mi s o r / w a 5 a 4a 3a 2 a 1 a 0 xx xxxxx a6 .. a 0 : 7 a d d r es s b i t s d7 .. d 0 : 8 dat a b i t s s p i m e m o r y re ad c y cl e de s c r i p t i o n ( d i v i d ed i n t w o s p i cy c l es d u e t o e e p r o m r e ad a c ces s ti m e ) cs b sc k mo s i mi s o r / w a 5a 4a 3a 2a 1 a 0 hiz a6 .. a 0 : 7 a d d r es s b i t s d7 .. d 0 : 8 dat a b i t s d7 d6 d5 d4 d3 d2 x sc k f r eq u e n c y : 8 m h z m a x. x s p i a c ce l e r a t i on / t e m p e r a t u r e r ead c y c l e d e sc r i pt i o n cs b sc k mo s i mi s o hi z d1 d0 a6 a6 hiz r / w a 5a 4 a 3a 2 a 1 a 0 a6 d7 d6 d5 d7 d6 d5 d4 d3 d2 d1 r / w a 5a 4a 3a 2a 1 a 0 hiz a6 .. a 0 : 7 a d d r es s b i t s d7 .. d 0 : 8 dat a b i t s x d0 a6 em / w i l 08/ 10 / 0 3 hi z x d 4 d3 d2 d1 d0 hiz due to the standard 16-bit protocol, the digital codes for the acceleration values must be read by two successive spi cycles. the user has to read the 7 m sb first and then the 3 lsb. it is also possible to read only the 7 msb. the 3 lsb are protected in such a way that during the read-out of the 7 msb the lsb are not changed or updated. the update of the lsb does not take place bef ore the msb are read again. therefore it cannot happen that a mixed acceleration value is read. rev. 1.2 page 6 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 3.3 spi timing mis o mos i sck csb 1 3 4 5 6 2 7 # p a r a m e t e r sy m b o l m i n u n i t s 1 csb setup time t setup_csb 16 2 csb hold time t hold_csb 16 3 sck high period t high_sck 25 4 sck low period t low _ sck 25 5 mosi setup time t setup_mosi 10 6 mosi hold time t hold_mosi 10 7 miso delay time t v a lid_miso 22 ns rev. 1.2 page 7 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 4 memory 4.1 eeprom an eeprom is used to store the non-volatile dat a, calibration parameters and the current working modes. these are in detail - g-range (2g or 10g) - operation mode (full performance, low-power, standby) - interrupt mode (global or independent) - interrupt acceleration threshold and hysteresis level - s e lf tes t. 4.1.1 register arithmetic the following arithmetics are used for memory registers. r e g i s t e r f o r m a t b i t w i d t h a x|y | z (acceleration values) 2's complement 10 threshold (th or th_x|y|z) unsigned positive either 5 or 7 hysteresis (hy or hy_x|y|z) unsigned positive either 3 or 7 rev. 1.2 page 8 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 4.2 global memory mapping the global memory mapping comprises eeprom and latches. bi t7 bi t6 bi t5 b i t4 bi t3 bi t2 bi t1 b i t0 reset 40h - 7f h na 30h - 3f h - 2ch - 2f h na 2bh h y _ y ( 2) hy _y ( 1 ) h y _ y ( 0 ) th_ y ( 4 ) th_y(3) th_y ( 2 ) t h _ y ( 1) th_ y ( 0 ) 00h 2ah hy _z ( 2 ) hy (6) hy _z ( 1 ) hy (5) hy _ z (0) hy ( 4 ) th_ z ( 4 ) hy ( 3 ) th_z(3) hy (2) th_z ( 2 ) hy (1) th_z ( 1 ) hy ( 0 ) th_ z ( 0 ) 00h 29h hy _ x (2 ) th( 6) hy _x (1) th(5 ) hy _x ( 0 ) th(4) th_x ( 4 ) th( 3) th_x ( 3 ) th( 2) th_ x ( 2 ) th(1 ) th_x (1) th(0) th_x ( 0 ) na 28h na 27h sel f tes t na 26h i n t. m ode na 25h 2 g / 1 0 g na 24h na 23h na 22h na 21h na 20h na 1f h 00h 1e h 00h 1d h 00h 1c h 00h 1b h 00h 1a h 00h 10h- 19h na 0f h 00h 0e h 00h 0d h 00h 0c h na 0bh 00h 0ah 00h 09h na 08h 00h 07h 00h 06h 00h 05h 00h 04h 00h 03h 00h 02h 00h 01h 00h 00h 00h eeprom pr ot ec t e d eeprom read - onl y i m a ge re s e rved a d res s a _ z (curr ent v a l u e o f y ax i s a c c e le rati on) ( m sb ) u nused add ress e s unu s e d b i ts a_x (l s b ) a _ x (cur rent v a l u e o f x ax i s a c c e le rati on) ( m sb ) unu s e d b i ts a _ y ( l s b ) a _ y (cur rent v a l u e of z ax i s a c c e le rati on) ( m sb ) unu s e d b i ts a _ z ( l s b ) o s c i l l ator tr im m i n g b a n dgap tri m m i ng s e n s or id o per ati on m ode + p r o t the image registers are read-only. all eeprom r egisters are duplicated into the corresponding image registers. rev. 1.2 page 9 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 5 operation 5.1 general description the SMB365 is a triaxial low-g acceleration sensor. it allows measurements of static as well as dynamic accelerations in all three dimensions. due to its th ree perpendicular axes it give s the absolute orientation in a gravity field. the sensor is set up as a two-chip arrangement in a standard mold package. an application-specific ic evaluates the output of a three-channel micromechanical acceleration-sensing element that works according to t he differential capacitance principle. the asic is produced in a standard cmos process. the production of the sensing element is based on standard semiconductor process steps followed by specia l steps providing the func tional structure. these steps start with the deposition of a thick epitaxial laye r on a sacrificial oxide. the large thickness allows the design of working capacitances of up to 1pf. this in turn enables the hybrid two-chip assembly. the poly layer is patterned by deep reactive ion etching in an inductive coupled plasma (drie-icp, the so- called bosch process). a large aspect ratio and a very high anisotropy is achieved by periodic passivation of the side walls in between the etch intervals. afterwards the sacrificia l layer is removed. eventually the sensing element is hermetically sealed by a bul k mircromachined cap to prevent damages of the structure by dicing, packaging and operation of the device. the encapsulation is performed in a cleanroom environment to reduce the risk of particle cont amination to a minimum. finally, the sensor is packaged in a standard surface mountable micro leadfra me qfn housing. here the asic is stacked onto the sensing element. in the asic, three different so called self-balanc ing bridges convert the c hange of capacitances into voltages. these signals are preconditioned by first order 50hz filters and then mult iplexed, amplified and converted into a digital output signal. s e l f -b al a n c i ng br id g e x - a x is self- b a l ancin g b r i d ge y- ax i s s e l f -b al a n c i ng br i d ge z- ax i s sp i ee p r o m am pli f i e r sc k cs b mi s o mo si v ddd vdda vs s mu x lo w - p a s s fil t e r ( 3 0 h z) lo w - p a s s fil t e r ( 3 0 h z) lo w - p a s s fil t e r ( 3 0 h z) c 1x c 2x c 1y c 2y s e nsin g elem en t ad c ad c pt a t int c 1z c 2z as ic (50hz) (50hz) (50hz) 5.2 operation modes and sensitivity resolution the sensor can be operated in three different modes: ? normal mode ? low-power mode ? standby mode. the different modes are chosen via the spi interface (see eeprom mapping). in normal mode the sensor reaches its full performance. in the low-power (interrupt) mode the sensor is fully functional but rev. 1.2 page 10 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec the performance is reduced. if the sensor is switched to standby , the asic enters a sleep mode. only a part of the logic and the spi block are active. all analog blocks including eeprom are deactivated. the sensitivity resolution varies as follows: operation mode sensitiv ity resolution units n o r m a l 1 0 low-power (interrupt) 7 s t a n d b y - bit 10bit roughly corresponds to 4mg, 7bit to 30mg resolution. due to non-perfect decoupling, any spi activity will perturb the a/d conversions. the best case is the absence of spi activity during a/d conversion wh ich is not possible all the time because of synchronization issues. the a/d conversion for the acceleration signals about x-, y-, z-axis are performed sequentially. therefore it is very unlikely that the a/d conversion of a gi ven axis will be systemat ically perturbed by spi activity because the duration of a spi cycle is very short compared to an a/d conversion. of course, this is only valid if there are not to m any other peripherals on this spi bus. 5.3 interrupt feature (low pow e r mode) the sensor (slave) can inform the host system (master) about an acceleration change even if spi communication is not taking place. this feature can be used as a ?wake-up? for instance. it is working in both g-range modes (2g and 10g), but only in low-power mode. no interrupt is generated in normal mode and/or during spi traffic. in case of a certain acceleration change the sensor w ill send an interrupt signal (int, active high) via the interrupt pin and will keep it up as long as the accelera tion is larger then a certain hysteresis level. via spi command it can be chosen between a global and a channel independent interrupt mode. in the global mode the same values for interrupt threshold and hysteresis level are valid for all three channels (both with 7 bit resolution, i.e. 16mg resolution in 2g-mode). in the independent mode theses values can be chosen individually for each channel (interrupt 5 bit, hysteresis 3 bit resolution, i.e. 63mg/250mg resolution in 2g-mode). the interrupt is activated when the acceleration signal (absolute value) in at least one of the channels exceeds its individual interrupt threshold (th_x, th _y and th_z respectively) or the global interrupt threshold (th) depending on the chosen interrupt mode. it is deactivated as soon as all channels fall (or still are) below their respective levels threshold levels minus their respective hysteresis values (individual: hy_x, hy_y. hy_z; global: hy). as mentioned in the register arithmetic, all thres hold and hysteresis values (th_x, th_y, th_z, th, hy_x, hy_y. hy_z and hy) are unsigned. the accele ration codes for the 3 channels a_x, a_y and a_z have a 2?s complement format and a coding on 10 bits . the msb of the acceleration code gives the sign of the acceleration and the 9 lsb contain the in formation of the absolute acceleration value. example of an interrupt generated by the x channel for the interrupt mode 1 (individual): int is activated when abs(a_x) 16*th_x rev. 1.2 page 11 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec int is deactivated when abs(a_x) < 16*th_x - 64*hy_x and no interrupt activation by the other channels example of an interrupt generated by the x channel for the interrupt mode 0 (global): int is activated when abs(a_x) 4*th int is deactivated when abs(a_x) < 4*th - 4*hy and no interrupt activation by the other channels notice that th_x(4..2) is always larger than hy_x, i. e. th_x>4*hy_x. this is also valid for all other channels and the global values, where we have th>hy (both are coded on 7 bits). if the user does not respect this rule (for all channels) or as soon as one of the interrupt thres holds is set to 0, the interrupt is deactivated. the eeprom registers dedicated to interr upt thresholds and hysteres is levels accept all code combinations which is required for storing the chip alignment error/cro ss axis sensitivity data. if the user modifies any threshold and/or hysteresis value, the interr upt output is not updated immediately but only after a refresh of the acceleration codes. application hints wake-up: a normal lifting of the sensor (like taking an object from a table) easily leads to acceleration gradients of 25g/s=100mg/4ms and to an amplitude of 500mg. zero-g/free fall detection: the interrupt can also be used for zero-g or free-fa ll detection. to this end 2g- and global interrupt mode have to be chosen and the output signal has to be interpreted as active low. in case of a free fall all axes will experience zero -g. therefore the interrupt threshold should be chosen close to 0 with the minimum hysteresis. the exac t values depend on the application but a minimum value of ~100mg is required taking into account t he 0g-offset tolerance and temperature drift: in this case the interrupt will be at high level if the sens or is in normal use. only in case of a free fall all 3 axes will experience accelerations smaller than 100mg and the output will switch to low level. rev. 1.2 page 12 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 5.4 acceleration data format the description of the digital signal is "2's comple ment". from negative to positive accelerations, the following sequence for the 2g measurement range can be observed ( 10g correspondingly): -2.000g : 10 0000 0000 -1.996g : 10 0000 0001 ... -0.004g : 11 1111 1111 0.000g : 00 0000 0000 +0.004g : 00 0000 0001 ... +1.992g : 01 1111 1110 +1.996g : 01 1111 1111 5.5 self test the sensor features an on-chip self-test which c an be activated by changing the corresponding self test bit in the corresponding via spi. the self test is r ealized by a physical deflect ion of the seismic mass due to an electrostatic force. thus, it provides full test ing of the complete signal evaluation path including the micromachined sensor structur e and the evaluation asic. the self test is activated by setting the self test ac tivation bit to 1. the test works in all measurement modes (2g, 10g, normal, low-power) and acts on a ll three channels simultaneously. the typical change in output will be 300lsb in the 2g-mode and 60lsb in the 10g- mode. the self test response remains as a static offset on the output as long as the se lf test register is not set back to 0. while the self test is activated, any acceleration or gravitational force applied to the sensor will be observed in the output signal as a superpositi on of both acceleration and self test signal. s e l f t e st r e sp on s e o u t p ut s i g n al [ l s b ] s e lf t e s t a c tiv a tio n bit 0 1 rev. 1.2 page 13 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 5.6 polarity of the acceleration output if the sensor is accelerated in the indicated dire ctions, the corresponding channel will deliver a positive acceleration signal (dynamic acceleration). if the sensor is at rest and the force of gravity is working along the indicated directions, the output of the corresponding channel will be negative. y x z 1 top si de rev. 1.2 page 14 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 5.7 pin configuration pin 1 identifier pin no. name function 1 n c not c o n n e c t e d 2 v dda asic analog core supply 3 v ss asic ground 4 dnc do not connect 5 cs b s p i select (chip select bar) 6 dnc do not connect 7 int interrupt output signal 8 s c k s p i c l oc k 9 dnc do not connect 10 mosi spi output (master out slave in) 11 miso spi input (master in slave out) 1 2 v ddd asic digital core supply 1 3 n c not c o n n e c t e d 1 4 n c not c o n n e c t e d rev. 1.2 page 15 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 5.8 connecting diagram the following external components are recommended to decouple the power source. v ddd v dda v ss int cs b sc k mis o mosi 1.8v 2.5v c 1 1 00nf c 3 10nf c 2 100 nf 5.9 handling instruction micromechanical sensors are designed to sense accele ration with high accuracy even at low amplitudes and contain highly sensitive structures inside t he sensor element. the micromachined sensors can tolerate mechanical shocks up to several thousand g's. however, these limits might be exceeded in conditions with extreme shock loads such as e.g. hammer blow on or next to the sensor, dropping of the sensor onto hard surfaces etc. we recommend to avoid g-forces beyond the specif ied limits (see section 2) during transport, handling and mounting of the sensors in a def ined and qualified installation process. rev. 1.2 page 16 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 6 package 6.1 outline dimensions the sensor housing is a standard qfn package. it is compliant with jedec standard mo-220. its dimensions are the following: rev. 1.2 page 17 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec rev. 1.2 page 18 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 6.2 marking 41 003 yy ww xx xxx zz zzzz asic lo t nu mber pro duc t pa rt n u m ber da te code s ens or lo t nu mb er pin 1 identifier engineering samples are marked with the following symbol: * 6.3 moisture sensitivity level and soldering the moisture sensitivity level of the SMB365 s ensors corresponds to jedec level 3, see also - ipc/jedec j-std-020c "joint industry standard: moisture/reflow sensitivity classification for nonhermetic solid state surface mount devices" - ipc/jedec j-std-033a "joint industry standard: handling, packing, shipping and use of moisture/reflow sensitive surface mount devices". the sensor fulfils the lead-free soldering requirem ents of the above-mentioned ipc/jedec standard, i.e. reflow soldering with a peak temperature up to 260c. 6.4 rohs compliancy the SMB365 sensor meets the requi rements of the ec restriction of hazardous substances (rohs) directive, see also "directive 2002/95/ec of the european parliam ent and of the council of 27 january 2003 on the restriction of the use of cert ain hazardous substances in elec trical and electronic equipment". rev. 1.2 page 19 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec 7 disclaimer 7.1 engineering samples engineering samples (marked with *) may not fulfill the complete technical data within this specification. as well, engineering samples (marked with *) are not determined for use in safe ty relevant automotive applications, life support appliances reselling or passing to final consumers. the customer indemnifies bosch sensortec for product liability claims or waives of recourse to bosch sensortec, if third parties advance due to or in connection with a failure, a defect in function or misuse of the customer samples supplied by bosch sensortec. 7.2 limiting values limiting values given are in accordance with the absolute maximum ratings (chapter 2). stress above one or more of the limiting values may cause perm anent damage to the device. operation of the device at these or at any other conditions above is not implied. exposure to limiting values for extended periods may also affect device reliability. 7.3 life support- and automotive applications the SMB365 is not designed for use in life support- or safety relevant automotive appliances, devices, or systems w here malfunction of these products can reasonably be ex pected to result in personal injury. again, the customer of bosch sensortec using or selling the SMB365 for use in such applications do so at one?s ow n risk and agree again to fully indemnify bosch sensortec for any damages resulting from such improper use or sale. rev. 1.2 page 20 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .
preliminary datasheet SMB365 three-axis accelerometer bos c h sens ortec document history and modification rev . no chapter description of modification/changes name date 0 . 0 0 2 - f e b - 0 6 1.1 6.1 5.7 - new outline dimensions - new pin configuration 2 7 - a p r - 0 6 1.11 7 5.7 rev i ew - disclaimer - pin1 identifier 2 7 - m a y - 0 6 1.2 1 4.2 5.7 test signal z memory mapping pin allocation 3 0 - m a y - 0 6 bosch sensortec g m bh g e rhard-k i ndler-strasse 8 72770 reutlingen l e opold. beer@bosch-sensortec. com www.b o s ch -s en s o rt ec.co m modifications reserved | printed in g e rm any v e rsion_1. 2_062006 rev. 1.2 page 21 ? bosch sensortec gmbh reserves all ri g hts even in the event of industrial propert y ri g hts . w e res e rv e al l ri g hts of disposal such as cop y in g and passin g on to third parties. bosch and the s y mbol are re g istered trademarks of robert bosch gmbh, german y . 7211rb11 .

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