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E-LIS2L02AS4 Datasheet(PDF) 7 Page - STMicroelectronics |
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E-LIS2L02AS4 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 14 page 7/14 LIS2L02AS4 5 Application hints Figure 4. LIS2L02AS4 Electrical Connection Power supply decoupling capacitors (100nF ceramic + 10 µF Al) should be placed as near as possible to the device (common design practice). The LIS2L02AS4 allows to band limit Voutx, Vouty through the use of external capacitors. The recom- mended 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 fre- quency (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 320 pF for Cload(x, y) is required in any case. 100nF 10 µF Vdd Vout X GND ST GND GND Cload x Cload y Optional Optional Vout Y PD FS Digital signals 1 3 2 4 5 6 7 8 9 22 21 20 19 18 16 17 15 23 10 24 11 14 13 12 LIS2L02AS4 (top view) DIRECTION OF THE DETECTABLE ACCELERATIONS 1 13 Y X GND f t 1 2 π R out C load xy , () ⋅⋅ ---------------------------------------------------------------- = f t 1.45 µF C load xy , () ------------------------------- Hz [] = |
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