AN3393 datasheet(44/103 Pages) STMICROELECTRONICS

전자부품 데이터시트 검색엔진

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AN3393 데이터시트(PDF) 44 Page - STMicroelectronics

부품명	AN3393

상세설명	This document is intended to provide information

PDF	103 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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44 / 103 page

State machine

AN3393

44/103

DocID018750 Rev 4

Vrow = (45*a1+77*a2) / 256

where:

- X, Y, Z are axes 8-bit measured raw input values.

- a1 and a2 are temporary maximum 16-bit values, defined as follows:

–

a1 = abs(X)+abs(Y)+abs(Z)

–

a2 = max (abs(X), abs(Y), abs(Z))

- 45 and 77 are 8-bit fixed constants.

The calculated vector (Vrow) can be filtered by a 7th-order FIR filter.

5.3.3

Vector filter

The vector filter is a 7th-order anti-symmetric FIR filter.

The transfer function of this filter is the following:

Xv_filt = (x0- x7) coeff0 + (x1-x6) coeff1+ (x2-x5) coeff2 + (x3-x4) coeff3

where:

coeff0 = VFC_4 (1Eh) register value;

coeff1 = VFC_3 (1Dh) register value;

coeff2 = VFC_2 (1Ch) register value;

coeff3 = VFC_1 (1Bh) register value.

Figure 6 shows the structure of the 7th-order anti-symmetric FIR filter.

Figure 6. Vector filter

AM14772V1

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