FXPS7115D4 datasheet(9/72 Pages) NXP

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NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

FXPS7115D4

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Product data sheet

Rev. 3 — 5 December 2019

9 / 72

7.3.4 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

USER OFFSET

AND

GAIN ADJUST

Figure 6. Signal chain diagram

7.3.4.1 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

7.3.4.2 Signal trim and compensation

The device includes digital trim to compensate for sensor offset, sensitivity, and

nonlinearity over temperature.

7.3.4.3 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)

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