FXPS7115D4S datasheet(6/74 Pages) NXP

6 / 74 page

NXP Semiconductors

FXPS7115D4S

Digital absolute pressure sensor, 40 kPa to 115 kPa

Once the ENDINIT bit is set, the ST_CTRL bits are forced to '0000'. Future writes to the

ST_CTRL bits are disabled until a device reset.

7.3.1.1 PABS common mode verification

When the PABS common mode self-test is selected, the ST_ACTIVE bit is set, the

ST_ERROR is cleared, and the device begins an internal measurement of the common

mode signal of the P-cells and compares the result against a predetermined limit. If the

result exceeds the limit, the ST_ERROR bit is set. The PABS common mode self-test

repeats continuously every tST_INIT when the ST_CTRL bits are set to the specified value.

Once the test is disabled, the ST_ERROR bit updates with the final test result within

tST_INIT of disabling the test. The ST_ACTIVE bit remains set until the final test result is

reported. Figure 4 is an example of a user-controlled self-test procedure.

aaa-023443

Read the DSP_STAT Register

Delay 500 s

Delay > tST_INIT from Self Test

Activation

Write ST_CTRL = 0x0

Disable PABS

Common Mode Self Test

Write ST_CTRL = 0x10

Enable PABS

Common Mode Self Test

ST_ACTIVE Set?

yes

User Determined Options:

Repeat Self-Test xx times

Set error status and continue

Set error status and ignore sensor data

ST_ERROR Set?

END

yes

Figure 4. User-controlled PABS common mode self-test flowchart

7.3.1.2 Startup digital self-test verification

Four unique fixed values can be forced at the output of the sinc filter by writing to the

ST_CTRL bits as shown in Table 4. The digital self-test values result in a constant value

at the output of the signal chain. After a specified time period, the SNS_DATAx register

value can be verified against the specified values in the table below. The values listed

below are for the PABS signal. When any of these self-test functions are selected, the

FXPS7115D4S

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

Objective data sheet

Rev. 1 — 9 August 2022

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