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3- axis, 2 g /4 g /8 g /16 g digital accelerometer enhanced product adxl345 - ep rev. b document feedback information furnished by analog devices is believed to be accurate and reliable. however , no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2009 C 2013 analog devices, inc. all rights reserved. technical support www.analog.com features ultra low power: as low as 23 a in measurement mode an d 0.1 a in standby mode at v s = 2.5 v (typ ical ) power consumption scales automatically with bandwidth user - selectable resolution from 10 to 13 bits 4 m g /lsb scale factor in all g ranges 32- sam ple fifo minimizes host processor load single t ap, double tap , and free - fall detection activity/inactivity monitoring supply voltage range: 2.0 v to 3.6 v i/o voltage range: 1.7 v to v s spi (3 - and 4 - wire) and i 2 c digital interfaces flexible interrupt mode s mappable to either interrupt pin measurement ranges selectable via serial command bandwidth selectable via serial command 10,000 g shock survival pb free/rohs compliant small and thin: 3 mm 5 mm 1 mm lga package enhanced product fea tures supports def ense and aerospace applications (aqec standard) extended industrial temperature range ( ? 55 c to +10 5c) controlled manufacturing baseline one assembly/test site one fabrication site enhanced product change notification qualification data available on request applications industrial e quipment aerospace e quipment general description the ad xl345 - ep is an extended performance version of the adxl345, which is a small, thin, ultra low power, 3- axis accelerometer with high resolution (13 - bit) measurement at up to 16 g . digital output data is formatted as 16 - bit twos complement and is accessible through either a spi (3 - or 4 - wire) or i 2 c digital interface. the adxl345 - ep is well suited for extended temperature range industrial and aerospace equipment . it measures the static acceleration of gravity in tilt - sensing applications, as well as dynamic acceleration resulting from motion or shock. its high resolution (3.9 m g /lsb) enables measurement of inclination changes less than 1. 0. several special sensing functions are provided. activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user - set thresholds . tap sensing detects single and double taps in any direction . free - fall sensing detects if the device is falling. these functions can be mapped individually to either of two interrup t outpu t pins. an integrated memory management system with a 32 - level first in, first out ( fifo ) buffer can be used to store data to mini mize host processor activity and lower overall system power consumption . low power modes enable intelligent motion - based pow er management with threshold sensing and active acceleration measurement at extremely low power dissipation. the adxl345 - ep is supplied in a small, thin , 3 mm 5 mm 1 mm, 14 -lead, enhanced plastic package. functional block dia gram 3-axis sensor sense electronics digi tal fi lter adxl345-e p power management contro l and interrupt logic serial i/o int1 v s v dd i/o int2 sda/sdi/sdio sdo/a lt address scl/sclk gnd adc 32 leve l fifo cs 10413-001 figure 1.
ADXL345-EP enhanced product rev. b | page 2 of 12 table of contents features .............................................................................................. 1 enhanced product features ............................................................ 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagram .............................................................. 1 revision history ............................................................................... 2 related documents .......................................................................... 2 specifications ..................................................................................... 3 absolu te maximum ratings ............................................................5 thermal resistance .......................................................................5 esd caution ...................................................................................5 pin conf iguration and function descriptions ..............................6 typical performance characteristics ..............................................7 outline dimensions ..........................................................................9 ordering guide .............................................................................9 revision history 4 /13 rev. a to rev. b deleted package information section, figure 2, and table 4, renumbered sequentially ................................................................. 5 2 /1 3 rev . 0 to rev. a changes 354 to 345 in f igure 2 ....................................................... 5 12 /11 rev ision 0: initial version r elated d ocuments the adxl345 -ep is , by definition , an extended performance variation of the adxl345 accelerometer. all adxl345 datasheet descriptions are applicable and not repeated in this document, so users s hould refer to it for complete functionality and product description. information and data in this adxl345 -ep subset datasheet super s ede those in the standard adxl345 datasheet.
enha nced product ADXL345-EP rev. b | page 3 of 12 specifications t a = 25c, v s = 2.5 v, v dd i/o = 1.8 v, acceleration = 0 g , c s = 10 f tantalum, c i/o = 0.1 f, output data rate ( odr ) = 800 hz, unless otherwise noted. all minimum and maximum specifications are guaranteed. typical specifications are not guaranteed. table 1 . parameter test conditions min ty p 1 max unit sensor input each axis measurement range user selectable 2, 4, 8, 16 g nonlinearity percentage of full scale 0.5 % inter - axis alignment error 0.1 degrees cross - axis sensitivity 2 1 % output resolution each axis a ll g ranges 10- bit resolution 10 bits 2 g range full resolution 10 bits 4 g range full resolution 11 bits 8 g range full resolution 12 bits 16 g range full resolution 13 bits sensitivity each axis sensitivity at x out , y out , z out a ll g - ranges, full resolution 230 256 282 lsb/ g 2 g , 10 - bit resolution 230 256 282 lsb/ g 4 g , 10 - bit resolution 115 128 141 lsb/ g 8 g, 10- bit resolution 57 64 71 lsb/ g 16 g, 10- bit resolution 29 32 35 lsb/ g sensitivity deviation from ideal all g - ranges 1.0 % scale factor at x out , y out , z out all g - ranges, full resolution 3.5 3.9 4.3 m g/ lsb 2 g , 10 - bit resolution 3.5 3.9 4.3 m g/ lsb 4 g, 10- bit resolution 7.1 7.8 8.7 m g/ lsb 8 g, 10- bit resolution 14.1 15.6 17.5 m g/ lsb 16 g, 10 - bit resolution 28.6 31.2 34.5 m g/ lsb sensitivity change due to temperature 0.01 %/c 0 g offset each axis 0 g output for x out , y out ? 150 0 +150 m g 0 g output for z out ? 250 0 +250 m g 0 g output deviation from ideal, x out , y out 35 m g 0 g output deviation from ideal, z out 40 m g 0 g offset vs. temperature for x- , y- axes 0.4 mg/c 0 g offset vs. temperature for z- axis 1 .2 m g /c noise x- , y - axes odr = 100 hz for 2 g , 10 - bit resolution or all g - ranges, full resolution 0.75 lsb rms z- axis odr = 100 hz for 2 g , 10 - bit resolution or all g - ranges, full resolution 1. 1 lsb rms output data rate and bandwidth user selectable output data rate (odr) 3 , 4 , 5 0.1 3200 hz self - test 6 output change in x- axis 0.20 2.10 g output change in y- axis ? 2.10 ? 0.20 g output change in z- axis 0.30 3.40 g power supply operating voltage range (v s ) 2.0 2.5 3.6 v interface voltage range (v dd i/o ) 1.7 1.8 v s v supply current odr 100 hz 140 a odr < 10 hz 23 a standby mode leakage cu rrent 0.1 a turn - on and wake - up time 7 odr = 3200 hz 1.4 ms
ADXL345-EP enhanced product rev. b | page 4 of 12 parameter test conditions min ty p 1 max unit temperature operating temperature range ? 55 + 105 c weight device weight 30 mg 1 the t ypical specification s shown are for at least 68% of the population of parts and are based on the worst case of mean 1 , except for 0 g output and sensitivity, which represent s the target value. for 0 g o utpu t and sensitivity, the deviation from the ideal describes the worst case of mean 1 . 2 cross - axis sensitivity is defined as coupling between any two axes. 3 bandwidth is the ?3 db frequency and is defined as half the output data rate, bandwidth = odr/2. 4 the output format for the 3200 hz and 1600 hz odrs is different from the outpu t format for the remaining odrs. this difference is described in the adxl345 data sheet . 5 output data rates below 6.25 hz exhibit additional offset shift with increased temperature, depending on selected output data rate. refer to the adxl345 data sheet for details. 6 self - test change is defined as the output ( g ) when the self_test bit = 1 (in the data_format register, address 0x31) minus the output ( g ) when the s elf_test bit = 0. due to device filtering, the output reaches its final value after 4 when enabling or disabling self - test, where = 1/(data rate). the part must be in normal power operation (low_power bit = 0 in the bw_rate register, address 0x2c) for self - test to operate correctly. 7 turn - on and wake - up times are determined by the user - defined bandwidth. at a 100 hz data rate, the turn - on and wake - up times are each approximately 11.1 ms. for other data rates, the turn - on and wake - up times are each approximately + 1.1 in milliseconds, where = 1/(data rate).
enha nced product ADXL345-EP rev. b | page 5 of 12 absolute maximum rat ings table 2 . parameter rating accelerat ion any axis, unpowered 10,000 g any axis, powered 10,000 g v s ? 0.3 v to + 3.9 v v dd i/o ? 0.3 v to + 3.9 v digital pins ? 0.3 v to v dd i/o + 0.3 v or 3.9 v, whichever is less all other pins ? 0.3 v to + 3.9 v output short - circuit duration (any pin to ground) indefinite temperature range powered ? 55 c to +105c storage ?65 c to +1 50c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance table 3 . package characteristics package type ja jc device weight 14- terminal lga 150 c/w 85 c/w 30 mg esd caution
ADXL345-EP enhanced product rev. b | page 6 of 12 pin configuration and fu nction descriptions 10413-002 cs sda/sdi/sdio sdo/alt address reserved nc int2 int1 v dd i/o gnd reserved gnd gnd v s 13 12 11 10 9 8 1 2 3 4 +x +y +z 5 6 14 7 scl/sclk a dxl345-ep top view (not to scale) figure 2. pin configuration (top view) table 4. pin function descriptions pin no. mnemonic description 1 v dd i/o digital interface supply voltage. 2 gnd this pin must be connected to ground. 3 reserved reserved. this pin must be connected to v s or left open. 4 gnd this pin must be connected to ground. 5 gnd this pin must be connected to ground. 6 v s supply voltage. 7 cs chip select. 8 int1 interrupt 1 output. 9 int2 interrupt 2 output. 10 nc not internally connected. 11 reserved reserved. this pin must be connected to ground or left open. 12 sdo/alt address serial data output (spi 4-wire)/alternate i 2 c address select (i 2 c). 13 sda/sdi/sdio serial data (i 2 c)/serial data input (spi 4-wire)/serial data input and output (spi 3-wire). 14 scl/sclk serial communications clock. scl is the clock for i 2 c, and sclk is the clock for spi.
enha nced product ADXL345-EP rev. b | page 7 of 12 typical performance characte ristics 150 100 50 0 ?50 ?100 ?150 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-004 figure 3. x- axis zero g offset vs. temperature eight parts in sockets, v s = 3.6 v 150 100 50 0 ?50 ?100 ?150 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-005 figure 4. y- axis zero g offset vs. temperat ure eight parts in sockets, v s = v dd i/o = 3.6 v 250 200 150 100 50 0 ?50 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-011 figure 5. z- axis zero g offset vs. temperature eight parts in sockets, v s = v dd i/o = 3.6 v 150 100 50 0 ?50 ?100 ?150 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-007 figure 6. x - axis zero g offset vs. temperature eight p arts in sockets , v s = 2.5 v 150 100 50 0 ?50 ?100 ?150 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-008 figure 7. y - axis zero g offset vs. temperature eight parts soldered to pcb, v s = v dd i/o = 2.5 v 100 0 150 250 200 50 ?50 ?60 ?40 ?20 0 20 40 60 80 100 temperature (c) output (m g) 10413-012 figure 8. z- axis zero g offset vs. temperature eight parts soldered to pcb, v s = v dd i/o = 2.5 v
ADXL345-EP enhanced product rev. b | page 8 of 12 256 258 260 254 252 248 246 244 242 250 ?60 ?40 ?20 0 20 40 60 80 100 120 temperature (c) sensitivity (lsb/ g) 10413-006 figure 9. x - axis sensitivity vs. temperature eight parts in sockets, v s = v dd i/o = 2.5 v 258 260 256 254 252 250 248 246 244 242 ?60 ?40 ?20 0 20 40 60 80 100 120 temperature (c) sensitivity (lsb/ g) 10413-010 figure 10 . z - axis sensitivity vs. temperature eight parts in sockets, v s = v dd i /o = 2.5 v 258 260 256 254 252 248 246 244 242 250 ?60 ?40 ?20 0 20 40 60 80 100 120 temperature (c) sensitivity (lsb/ g) 10413-009 figure 11 . y - axis sensitivity vs. temperature eight parts in sockets, v s = v dd i/o = 2.5 v
enha nced product ADXL345-EP rev. b | page 9 of 12 outline dimensions bottom v iew top vi ew end vi ew seating plane 1.00 0.95 0.85 5.00 bsc 3.00 bsc pad a1 corn er 0.79 0.74 0.69 1 6 7 8 14 13 0.80 bsc 1.01 1.50 0.49 0.50 0.49 0.813 0.50 03-16- 2010-a figure 12 . 14 - terminal land grid array [lga] (cc - 14 - 1) solder terminations finish is au over ni dimensions shown in millimeters ordering guide model 1 measurement range ( g ) specified voltage (v) temperature range package description package option adxl345 t ccz -ep 2, 4, 8, 16 2.5 ? 55c to +105c 14- terminal land grid arra y [lga] cc -14 -1 adxl345t ccz -ep -rl7 2, 4, 8, 16 2.5 ? 55c to +105c 14- terminal land grid array [lga] cc -14 -1 adxl345tccz -ep -rl 2, 4, 8, 16 2.5 ? 55c to +105c 14- terminal land grid array [lga] cc -14 -1 1 z = rohs compliant part.
ADXL345-EP enhanced product rev. b | page 10 of 12 notes
enha nced product ADXL345-EP rev. b | page 11 of 12 notes
ADXL345-EP enhanced product rev. b | page 12 of 12 notes analog devices offers sp ecific products designated for automotive applications; please consult your local analog devices sales representative for det ails. standard products sold by analog devices are not designed, intended, or approved for use in life support, implantable medical devices, transportation, nuclear, safety, or other equipment where malfunction of the product can reasonably be expected to result in personal injury, death, severe property damage, or severe environmental harm. buyer uses or sells standard products for u se in the above critical applications at buyer's own risk and buyer agrees to defend, indemnify, and hold harmless analog devices from any and all damages, claims, suits, or expenses resulting from such unintended use. ? 200 9 C 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d10413 -0- 4/13( b )

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