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this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change without notice. august 2013 docid025122 rev 1 1/16 LIS344AHH mems inertial sensor: high full-scale, high-bandwidth, low-noise analog accelerometer datasheet - preliminary data features ? 2.4 v to 3.6 v single supply operation ? high full-scale 6 g / 18 g user-selectable ? high bandwidth ? low noise ? output voltage, offset and sensitivity are ratiometric to the supply voltage ? factory-trimmed device sensitivity and offset ? embedded self test ? rohs/ecopack ? compliant ? high shock survivability (10000 g ) applications ? portable devices ? gaming and virtual reality input devices ? antitheft systems and inertial navigation ? appliances and robotics description the LIS344AHH is a high-performance, high- bandwidth, low-noise three-axis linear accelerometer that includes a sensing element and an ic interface able to take information from the sensing element and provide an analog signal to the external world. the sensing element, capable of detecting linear acceleration, is manufactured using a dedicated process developed by st to produce inertial sensors and actuators in silicon. the ic interface is manufactured using an st proprietary cmos process with a high level of integration. the dedicated circuit is trimmed to better match the characteristics of the sensing element. the LIS344AHH has a user-selectable full scale of 6 g or 18 g and it is capable of measuring accelerations over a high bandwidth of 2.5 khz for all axes. the device bandwidth may be reduced by using external capacitances. the self-test capability allows the user to check the functioning of the system. the LIS344AHH is available in a land grid array package (lga) manufactured by st. it is guaranteed to operate over an extended temperature range of -40 c to +85 c. lga 16 (4x4x1.5 mm) table 1. device summary order codes temp range [ ? c] package packaging LIS344AHH -40 to +85 lga-16 tray LIS344AHHtr -40 to +85 lga-16 tape and reel www.st.com
content LIS344AHH 2/16 docid025122 rev 1 content 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 ic interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 output response vs. orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
docid025122 rev 1 3/16 LIS344AHH list of tables 16 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. mechanical characteristics @ vdd = 3.3 v, t = 25 c unless otherwise noted . . . . . . . . . . 7 table 4. electrical characteristics @ vdd = 3.3 v, t = 25 c unless otherwise noted . . . . . . . . . . . . 8 table 5. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
list of figures LIS344AHH 4/16 docid025122 rev 1 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. LIS344AHH electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 4. output response vs. orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 5. lga 16: mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
docid025122 rev 1 5/16 LIS344AHH block diagram and pin description 16 1 block diagram and pin description 1.1 block diagram figure 1. block diagram 1.2 pin description figure 2. pin connections s/h s/h routx routz reference trimming circuit clock s/h routy charge amplifier demux voutx voutz vouty y+ z+ y- z- x+ x- a self-test mux (top view) directions of the detectable accelerations (bottom view) y 1 x z fs st nc res voutx nc vouty nc gnd nc pd voutz vdd res nc nc 1 8 12 5 4 9 13 16
block diagram and pin description LIS344AHH 6/16 docid025122 rev 1 table 2. pin description pin # pin name function 1 fs full-scale selection (logic 0: 6 g full scale; logic 1: 18 g full scale) 2 st self-test (logic 0: normal mode; logic 1: self-test mode) 3 nc internally not connected 4 res leave unconnected or connect to vdd 5 pd power-down (logic 0: normal mode; logic 1: power-down mode) 6 nc internally not connected 7 gnd 0 v supply 8 voutz output voltage z-channel 9 nc internally not connected 10 vouty output voltage y-channel 11 nc internally not connected 12 voutx output voltage x-channel 13 nc internally not connected 14 vdd power supply 15 res connect to vdd 16 nc internally not connected
docid025122 rev 1 7/16 LIS344AHH mechanical and electrical specifications 16 2 mechanical and electrical specifications 2.1 mechanical characteristics table 3. mechanical characteristics @ vdd = 3.3 v, t = 25 c unless otherwise noted (1) symbol parameter test condition min. typ. (2) max. unit ar acceleration range (3) fs pin connected to gnd 6 g fs pin connected to vdd 18 so sensitivity (4) full scale = 6 g vdd/15 - 10% vdd/15 vdd/15+10% v/ g full scale = 18 g vdd/45 - 10% vdd/45 vdd/45+10% sodr sensitivity change vs temperature delta from +25 c 0.01 %/c voff zero-g level (4) full scale = 6 g t = 25 c vdd/2 v offdr zero-g level change vs. temperature delta from +25 c 0.4 m g /c nl non-linearity (5) best-fit straight line full scale = 6 g 0.5 % fs crossax cross-axis (6) 2 % an acceleration noise density vdd = 3.3 v; full scale = 6 g 100 g / vt self-test output voltage change (7),(8),(9) x-axis t = 25 c; vdd = 3.3 v mv y-axis t = 25 c; vdd = 3.3 v mv z-axis t = 25 c; vdd=3.3 v mv fres sensing element resonant frequency (10) x-, y-, z-axis 2.5 khz top operating temperature range -40 +85 c 1. the product is factory calibrated at 3.3 v. the operational power supply range is from 2.4 v to 3.6 v. voff, so and vt parameters will vary with supply voltage. 2. typical specifications are not guaranteed. 3. guaranteed by wafer level test and measurement of initial offset and sensitivity. 4. zero-g level and sensitivity are essentially ratiometric to supply voltage at the calibration level 8%. 5. by design 6. contribution to the measuring output of an inclination/acceleration along any perpendicular axis. 7. ?self-test output voltage change? is defined as vout (vst=logic1) -vout (vst=logic0) . 8. ?self-test output voltage change? varies cubically with supply voltage. 9. when full scale is set to 18 g , ?self-test output voltage change? is one third of the specified value at 6 g . 10. minimum resonance frequency fres = 2.5 khz. sensor bandwidth = 1/(2* ? *110k ? *cload), with cload > 0.4 nf. hz
mechanical and electrical specifications LIS344AHH 8/16 docid025122 rev 1 2.2 electrical characteristics table 4. electrical characteristics @ vdd = 3.3 v, t = 25 c unless otherwise noted (1) symbol parameter test condition min. typ. (2) max. unit vdd supply voltage 2.4 3.3 3.6 v idd supply current normal mode 680 a power-down mode 1 5 vfs vst vpd full-scale input self-test input power-down input logic 0 level 0 0.3*vdd v logic 1 level 0.7*vdd vdd v rout output impedance of voutx, vouty, voutz 90 110 130 k ? cload capacitive load drive (3) for voutx, vouty, voutz 0.4 nf to n turn-on time upon exiting power-down mode cload expressed in f 550*cload+ 0.3 ms to p operating temperature range -40 +85 oc 1. the product is factory calibrated at 3.3 v. 2. typical specifications are not guaranteed. 3. minimum resonance frequency fres = 2.5 khz. device bandwidth = 1/(2* ? *110 k ? *cload), with cload > 0.4 nf.
docid025122 rev 1 9/16 LIS344AHH mechanical and electrical specifications 16 2.3 absolute maximum ratings stresses above those listed as ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device under these conditions is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. table 5. absolute maximum ratings symbol ratings maximum value unit vdd supply voltage -0.3 to 6 v vin input voltage on any control pin (fs, st, pd) -0.3 to vdd +0.3 v a pow acceleration (any axis, powered, vdd = 3.3 v) 3000 g for 0.5 ms 10000 g for 0.1 ms a unp acceleration (any axis, not powered) 3000 g for 0.5 ms 10000 g for 0.1 ms t stg storage temperature range -40 to +125 c esd electrostatic discharge protection 4 (hbm) kv 1.5 (cdm) kv 400 (mm) v this device is sensitive to mechanical shock, improper handling can cause permanent damage to the part. this is an electrostatic-sensitive device (esd), improper handling can cause permanent damage to the part.
mechanical and electrical specifications LIS344AHH 10/16 docid025122 rev 1 2.4 terminology sensitivity describes the gain of the sensor and can be determined by applying 1 g acceleration to it. as the sensor can measure dc accelerations, this can be done easily by pointing the axis of interest towards the center of the earth, noting the output value, rotating the sensor by 180 degrees (point to the sky) and noting the output value again, thus applying 1 g acceleration to the sensor. subtracting the larger output value from the smaller one, and dividing the result by 2, will give the actual sensitivity of the sensor. this value changes very little over temperature (see sensitivity change vs. temperature) and also very little over time. the sensitivity tolerance describes the range of sensitivities of a large population of sensors. zero-g level describes the actual output signal if there is no acceleration present. a sensor in a steady-state on a horizontal surface will measure 0 g for the x-axis and 0 g for the y-axis whereas the z-axis will measure 1 g . the output is ideally for a 3.3 v powered sensor vdd/2 = 1650 mv. a deviation from the ideal 0-g level (1650 mv in this case) is called zero-g offset. offset of highly accurate mems sensors is to some extent a result of stress to the sensor and therefore the offset can slightly change after mounting the sensor on a printed circuit board or exposing it to extensive mechanical stress. offset changes little over temperature - see ?zero-g level change vs temperature? - the zero-g level of an individual sensor is very stable over its lifetime. the zero-g level tolerance describes the range of zero-g levels of a population of sensors. the self-test allows testing the mechanical and electrical parts of the sensor, allowing the seismic mass to be moved by means of an electrostatic test-force. the self-test function is off when the st pin is connected to gnd. when the st pin is tied to vdd, an actuation force is applied to the sensor, simulating a definite input acceleration. in this case the sensor outputs will exhibit a voltage change in their dc levels which is related to the selected full scale and dependent on the supply voltage through the device sensitivity. when st is activated, the device output level is given by the algebraic sum of the signals produced by the acceleration acting on the sensor and by the electrostatic test-force. if the output signals change within the amplitude specified in table 3 , then the sensor is working properly and the parameters of the interface chip are within the defined specifications. output impedance describes the resistor inside the output stage of each channel. this resistor is part of a filter consisting of an external capacitor of at least 0.4 nf and the internal resistor. due to the high resistor level, only small inexpensive external capacitors are needed to generate low corner frequencies. when interfacing with an adc it is important to use high input impedance input circuitries to avoid measurement errors. note that the minimum load capacitance forms a corner frequency close to the resonance frequency of the sensor. in general the smallest possible bandwidth for a particular application should be chosen to get the best results.
docid025122 rev 1 11/16 LIS344AHH functionality 16 3 functionality the LIS344AHH is an ultra-compact low-power, analog output three-axis linear accelerometer packaged in an lga package. the complete device includes a sensing element and an ic interface able to take information from the sensing element and provide an analog signal to the external world. 3.1 sensing element a proprietary process is used to create a surface micromachined accelerometer. the technology allows processing suspended silicon structures which are attached to the substrate in a few points called anchors and are free to move in the direction of the sensed acceleration. in order to be compatible with traditional packaging techniques a cap is placed on top of the sensing element to avoid blocking the moving parts during the molding phase of the plastic encapsulation. when an acceleration is applied to the sensor, the proof mass displaces from its nominal position, causing an imbalance in the capacitive half-bridge. this imbalance is measured using charge integration in response to a voltage pulse applied to the sense capacitor. at steady-state the nominal value of the capacitors are few pf and when an acceleration is applied, the maximum variation of the capacitive load is in the ff range. 3.2 ic interface the complete signal processing uses a fully differential structure, while the final stage converts the differential signal into a single-ended signal in order to be compatible with the external world. the first stage is a low-noise capacitive amplifier that implements a correlated double sampling (cds) at its output to cancel the offset and the 1/f noise. the resulting signal is then sent to three different s&hs, one for each channel, and made available to the outside. both analog parameters (output offset voltage and sensitivity) are ratiometric to the voltage supply. increasing or decreasing the voltage supply, the sensitivity and the offset will increase or decrease linearly. this feature provides the cancellation of the error related to the voltage supply along an analog-to-digital conversion chain. 3.3 factory calibration the ic interface is factory calibrated for sensitivity (so) and zero-g level (voff). the trim values are stored inside the device in a nonvolatile structure. anytime the device is turned on, the trimming parameters are downloaded into the registers to be employed during normal operation. this allows the user to employ the device without further calibration.
application hints LIS344AHH 12/16 docid025122 rev 1 4 application hints figure 3. LIS344AHH electrical connections power supply decoupling capacitors (100 nf ceramic or polyester + 10 f aluminum) should be placed as near as possible to the device (common design practice). the LIS344AHH allows to band limit voutx, vouty and voutz through the use of external capacitors. the recommended frequency range spans from dc up to 2.5 khz. in particular, capacitors are added at output voutx, vouty, voutz pins to implement low-pass filtering for antialiasing and noise reduction. the equation for the cutoff frequency (f t ) of the external filters is in this case: taking into account that the internal filtering resistor (r out ) has a nominal value equal to 110 k ? , the equation for the external filter cutoff frequency may be simplified as follows: the tolerance of the internal resistor can vary typically from ? 20% of its nominal value of 110 k ? , thus the cutoff frequency will vary accordingly. a minimum capacitance of 0.4 nf for c load (x, y, z) is required. digital signals LIS344AHH (top view) (top view) directions of the detectable accelerations y 1 x z st gnd 1 4 9 12 vdd gnd gnd 100nf 10 f vout y cload y vout x cload x vout z cload z optional 5 16 2 3 67 8 10 11 15 14 13 fs pd pin 1 indicator optional optional 1 2 ? r out c load xyz ?? ?? ?? --------------------------------------------------------------- = f t 1.45 ? f c load xyz ?? ?? ---------------------------------- - hz ?? =
docid025122 rev 1 13/16 LIS344AHH application hints 16 4.1 soldering information the lga package is compliant with the ecopack, rohs and ?green? standard. it is qualified for soldering heat resistance according to jedec j-std-020c. leave ?pin 1 indicator? unconnected during soldering. land pattern and soldering recommendations are available at www .st.com/mems . 4.2 output response vs. orientation figure 4. output response vs. orientation figure 4 shows the output voltage values of the LIS344AHH, powered at 3.3 v, with full scale 6 g . earth?s surface x=1.65v (0g) y=1.65v (0g) z=1.43v (-1g) x=1.65v (0g) y=1.65v (0g) z=1.87v (+1g) x=1.65v (0g) y=1.87v (+1g) x=1.65v (0g) y=1.43v (-1g) x=1.43v (-1g) y=1.65v (0g) x=1.87v (+1g) y=1.65v (0g) z=1.65v (0g) z=1.65v (0g) z=1.65v (0g) z=1.65v (0g) to p bottom to p bottom
package information LIS344AHH 14/16 docid025122 rev 1 5 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 5. lga 16: mechanical data and package dimensions a1 1.500 1.600 0.0591 0.0630 a2 1.330 0.0524 a3 0.160 0.200 0.240 0.0063 0.0079 0.0094 d 0.300 0.0118 d1 3.850 4.000 4.150 0.1516 0.1575 0.1634 e1 3.850 4.000 4.150 0.1516 0.1575 0.1634 l2 1.950 0.0768 m 0.100 0.0039 n1 0.650 0.0256 n2 0.980 0.0386 p1 1.750 0.0689 p2 1.525 0.0600 t1 0.400 0.0157 t2 0.300 0.0118 k 0.050 0.0020 lga16l (4x4x1.5mm) land grid array package 7974136d outline and mechanical data ref. min. min. mm dimensions typ. max. typ. max.
docid025122 rev 1 15/16 LIS344AHH revision history 16 6 revision history table 6. document revision history date revision changes 23-aug-2013 1 initial release.
LIS344AHH 16/16 docid025122 rev 1 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. a ll st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not authorized for use in weapons. nor are st products designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, a utomotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2013 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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