STEVAL-MKI047V1 STMicroelectronics, STEVAL-MKI047V1 Datasheet - Page 8

• Manufacturer Part Number: STEVAL-MKI047V1
• Description: BOARD EVALUATION FOR LPR550AL
• Manufacturer: STMicroelectronics
• Series: MEMSr

Specifications of STEVAL-MKI047V1

• Design Resources: STEVAL-MKI047V1 Schematic STEVAL-MKI047V1 Bill of Material STEVAL-MKI047V1 Gerber Files
• Sensor Type: Gyroscope, 2 Axis
• Sensing Range: ±500°/sec
• Interface: Analog
• Sensitivity: 2mV/°/s
• Embedded: No
• Utilized Ic / Part: LPY550AL
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-10047

Application hints
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8/12
Application hints
Figure 3.
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 LPY550AL allows band limiting the output rate response through the use of an external
low pass filter (suggested) and/or high pass filter (optional) in addition to the embedded low
pass filter (f
4xOUTX and 4xOUTZ are respectively OUTX and OUTZ amplified outputs lines, internally
buffered to ensure low output impedance.
If external high pass or low pass filtering is not applied it is mandatory to short-circuit
respectively pad 4 to pad 5 and pad 9 to pad 10 when amplified outputs are used.
When only not-amplified outputs are used (OUTX/Z), it is suggested to set pads 5 and 9 to
fixed reference voltage (Vref).
When high pass filter is applied to not amplified output (OUTx), it is recommended to buffer
the line before entering ADC for performance optimization.
The LPY550AL IC includes a PLL (phase locked loop) circuit to synchronize driving and
sensing interfaces. Capacitors and resistors must be added at FILTVDD and VCONT pins
(as shown in
Typical values:
R1 = 1MOhm
C1 = 4.7 uF
R2 = 33kOhm
C2 = 2.2nF to 2.2uF
filtered output X
Not amplified
10kOhm
10nF
R1
t
LPY550AL electrical connections and external components values
= 140 Hz).
Figure
Recomended
Low-pass filter
C2
GND
C1
C2
3) to implement a low-pass filter.
470nF
R2
Optional
High-pass filter
Vref
R1
Doc ID 15808 Rev 2
C1
GND
GND
100 nF
1
5
GND
10 µF
LPY550AL
(Top View)
16
6
Vdd
14
8
13
9
C1
R1
Vref
ST
HP
PD
(TOP VIEW)
DIRECTION OF THE
DETECTABLE
ANGULAR RATES
R2
C2
GND
+ Ω
filtered output Z
Not amplified
LPY550AL
z
+ Ω
x