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LIS244ALHTR Datasheet(PDF) 12 Page - STMicroelectronics |
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LIS244ALHTR Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 16 page  Application hints LIS244ALH 12/16 4 Application hints Figure 3. LIS244ALH electrical connection Power supply decoupling capacitors (100 nF ceramic or polyester + 10 µF Aluminum) should be placed as near as possible to the device (common design practice). The LIS244ALH allows to band limit VoutX and VoutY through the use of external capacitors. The recommended frequency range spans from DC up to 2.0 KHz. In particular, capacitors are added at output VoutX and VoutY pins to implement low-pass filtering for antialiasing and noise reduction. The equation for the cut-off frequency (ft) of the external filters is in this case: Taking into account that the internal filtering resistor (Rout) has a nominal value equal to 110 K 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 110 K Ω; thus the cut-off frequency will vary accordingly. A minimum capacitance of 1 nF for Cload(x, y) is required. Digital signals LIS244ALH (top view) (TOP VIEW) DIRECTIONS OF THE DETECTABLE ACCELERATIONS Y 1 X ST GND 1 4 9 12 Vdd GND GND 100nF 10µF Vout y Cload Y Vout x Cload X 5 16 2 3 67 8 10 11 15 14 13 FS Pin 1 indicator Optional Optional f t 1 2 π R out C load xy , () ⋅⋅ ----------------------------------------------------------------- = f t 1.45 µF C load xy , () ------------------------------- Hz [] = |
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