FXPS7115D4 datasheet(8/72 Pages) NXP

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NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

7.3.3 Digital signal processor (DSP)

A DSP is used to perform signal filtering and compensation. A diagram illustrating the signal processing flow

within the DSP is shown in Figure 6.

aaa-029737

Σ OUT = Y(Z)

SINC

FILTER

TRIM

IIR

LPF

PABS

OFFSET

AND

GAIN ADJUST

Figure 6. Signal chain diagram

7.3.3.1 Decimation sinc filter

In Equation 2, the output of the ΣΔ modulator is decimated and converted to a parallel value by two third-order

sinc filters; the first with a decimation ratio of 24 and the second with a decimation ratio of 4.

(2)

aaa-023449

frequency (Hz)

103

105

104

magnitude

(dB)

-120

-100

-80

-60

-40

-20

minimum

typical

maximum

Figure 7. Sinc filter response

7.3.3.2 Signal trim and compensation

The device includes digital trim to compensate for sensor offset, sensitivity, and nonlinearity over temperature.

7.3.3.3 Low-pass filter

Data from the sinc filter is processed by an infinite impulse response (IIR) low-pass filter with the transfer

function and coefficients shown in Equation 3.

(3)

FXPS7115D4

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 6.1 — 7 June 2023

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