LSM320HAY30 datasheet(18/42 Pages) STMICROELECTRONICS

18 / 42 page

Application hints

LSM320HAY30

18/42

Doc ID 16917 Rev 1

The device core is supplied through the Vdd line. Power supply decoupling capacitors

(C1=100 nF ceramic, C2=10 µF aluminum) should be placed as near as possible to the

supply pin of the device (common design practice).

All voltage and ground supplies must be present at the same time to obtain proper behavior

of the IC (refer to

Figure 3).

5.1

Linear acceleration sensing

The functionality of the device and the measured acceleration data is selectable and

accessible through the SPI/I2C interface.

The functions, the threshold and the timing of the two interrupt pins (INT 1 and INT 2) can be

completely programmed by the user though the SPI/I2C interface.

5.2

Angular rate sensing

The LSM320HAY30 allows band limitation of the output rate response through the use of an

external low-pass filter (recommended) and/or high-pass filter (optional) in addition to the

embedded low-pass filter (ft = 140 Hz).

4xOUTX and 4xOUTZ are, respectively, OUTX and OUTZ amplified outputs lines, internally

buffered to ensure low output impedance.

If external filtering is not applied, it is mandatory to short-circuit pad 18 to pad 19 and pad 23

to pad 24, respectively, when amplified outputs are used.

When only a non-amplified output is used (OUTX/OUTZ), it is recommended to set pin 19

and 23 to a fixed reference voltage (Vref).

The LSM320HAY30 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 second-order low-pass filter.

Figure 4.

Angular rate output response vs. rotation

Steady state position:

4xOUTX = 4xOUTZ = 1.5V

OUTX = OUTZ = 1.5V

Positive rotations as indicated by the arrows

+300°/sec --> 4xOUTX, 4xOUTZ = 1.5V + SoA*300 = 2.5V

+300°/sec --> OUTX, OUTZ = 1.5V + So*300 = 1.75V

increase output value over Zero rate level:

+Ω

AM06042v1

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