FXPS7115D4 datasheet(8/72 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

8 / 72

Table 4. Self-test control register

ST_CTRL[3]

ST_CTRL[2]

ST_CTRL[1]

ST_CTRL[0]

Function

SNS_DATAx

Digital self-test #1

8171h

Digital self-test #2

6C95h

Digital self-test #3

807Ah

Digital self-test #4

78ACh

7.3.2.3 Startup sense data fixed value verification

Four unique fixed values can be forced to the SNS_DATAX_x registers by writing to

the ST_CTRL bits as shown in Table 5. When any of these values are selected, the

ST_ACTIVE bit is set. These signals can only be selected when the ENDINIT bit is not

set.

Table 5. Self-test control bits for sense data fixed value verification

ST_CTRL[3]

ST_CTRL[2]

ST_CTRL[1]

ST_CTRL[0]

Function

SNS_DATAx

contents

DSP write to SNS_DATAx_

X registers inhibited.

0000h

DSP write to SNS_DATAx_

X registers inhibited.

AAAAh

DSP write to SNS_DATAx_

X registers inhibited.

5555h

DSP write to SNS_DATAx_

X registers inhibited.

FFFFh

7.3.3 ΣΔ converter

A second order sigma delta modulator converts the voltage from the analog front end to a

data stream that is input to the DSP. A simplified block diagram is shown in Figure 5.

aaa-023446

z-1

1 - z-1

1 - bit

quantizer

second

integrator

ADC

V = +VREF, 0 V, -VREF

Y(Z) = {0,1}

β2 = 1

α2 = 1

DAC

z-1

1 - z-1

first

integrator

V = C x Vx/CINT1

CTOP

transducer

C = CTOP - CBOT

CBOT

CINT1

β1 = 1

α1 =

Figure 5. ΣΔ converter block diagram

The sigma delta modulator operates at a frequency of 1 MHz, with the transfer function in

Equation 1.

(1)

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