LPY450AL Datasheet, PDF (10/14 Pages) STMicroelectronics – MEMS motion sensor: dual-axis pitch and yaw ±500 dps analog gyroscope

Application hints
5
Application hints
LPY450AL
Figure 3. LPY450AL electrical connections and external components values
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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 LPY450AL allows band limiting of the output rate response through the use of an
external low-pass filter (recommended) in addition to the embedded low-pass filter (f_t = 140
Hz).
The 4xOUTX and 4xOUTZ are, respectively, OUTX and OUTZ amplified output lines,
internally buffered to ensure low output impedance.
If external low-pass filtering is not applied, it is mandatory to short-circuit pin 1 to pin 5 and
pin 16 to pin 20, respectively, when amplified outputs are used.
When only a non-amplified output is used (OUTX/OUTZ), it is recommended to set pin 5
and 16 to a fixed reference voltage (Vref).
The LPY450AL IC includes a PLL (phase-locked loop) circuit to synchronize driving and
sensing interfaces. Capacitors and resistors must be added at the FILTVDD and VCONT
pins (as shown in Figure 3) to implement a low-pass filter.
10/14
Doc ID 16580 Rev 1