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LIS3L02AL Datasheet(PDF) 10 Page - STMicroelectronics |
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LIS3L02AL Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 17 page Application hints LIS3L02AL 10/17 4 Application hints Figure 3. LIS3L02AL electrical connection Power supply decoupling capacitors (100nF ceramic or polyester + 10 µF Aluminum) should be placed as near as possible to the device (common design practice). The LIS3L02AL allows to band limit Voutx, Vouty and Voutz through the use of external capacitors. The re-commended frequency range spans from DC up to 1.5 KHz. In particular, capacitors must be added at output pins to implement low-pass filtering for antialiasing and noise reduction. The equation for the cut-off frequency (ft) of the external filters is: Taking in account that the internal filtering resistor (Rout) has a nominal value equal to 110k Ω, the equation for the external filter cut-off frequency may be simplified as follows: The tolerance of the internal resistor can vary typically of ±20% within its nominal value of 110k Ω; thus the cut-off frequency will vary accordingly. A minimum capacitance of 1nF for Cload(x, y, z) is required in any case. . Table 5. Filter capacitor selection, Cload (x,y,z) Cut-off frequency Capacitor value 1 Hz 1500 nF 10 Hz 150 nF 20 Hz 68 nF 50 Hz 30 nF 100 Hz 15 nF 200 Hz 6.8 nF 500 Hz 3 nF DIRECTION OF THE DETECTABLE ACCELERATIONS 1 Y X Z Digital signals Vout Z Cload z Optional Vout X 100nF Cload x LIS3L02AL 10 µF Vdd Vout Y GND GND Cload y (top view) Optional Optional GND ST f t 1 2 π R out C load xyz ,, () ⋅⋅ -------------------------------------------------------------------- = f t 1.45 µF C load xyz ,, () ------------------------------------- Hz [] = |
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