FXPS7115D4 datasheet(45/72 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

45 / 72

The pressure threshold registers hold independent unsigned 16-bit values for a high and

a low threshold. The window comparator threshold alignment is shown in Section 7.3.4.4

"Absolute pressure output data scaling equation".

If either the high or low threshold is programmed to 0000h, comparisons are disabled for

that threshold only. The interrupt comparison still functions for the opposite threshold.

If both the high and low thresholds are programmed to 0000h, the interrupt output is

disabled.

7.7.15 P_CAL_ZERO - pressure calibration registers (address 4Ch, 4Dh)

The pressure calibration registers contain user programmable values to adjust the offset

of the absolute pressure.

These registers can be written during initialization but are locked once the ENDINIT bit

is set (see Section 7.7.4 "DEVLOCK_WR - lock register writes register (address 10h)").

These registers are included in the read/write array error detection. Changes to these

registers reset the DSP data path. The contents of the SNSDATA_x registers are not

guaranteed until the DSP has completed initialization, as specified in Table 102. Reads

of the SNSDATA_x registers and sensor data requests should be prevented during this

time.

Table 73. P_CAL_ZERO - pressure calibration registers (address 4Ch, 4Dh) bit allocation

Location

Bit

Address

4Ch

P_CAL_ZERO_L

P_CAL_ZERO[7:0]

4Dh

P_CAL_ZERO_H

P_CAL_ZERO[15:8]

Reset

Access

R/W

The P_CAL_ZERO register value is a signed 16-bit value that is directly added to the

internally calibrated pressure signal value as shown in Equation 6. The equation applies

to the values in the 16-bit SNSDATA registers.

(6)

Where:

PABSkPa = The absolute pressure output in kPa

PABSLSB = The internal trimmed absolute pressure output in LSB

PABSOFFLSB = The internal trimmed absolute pressure output value at 0 kPa in LSB

PABSSENSE = The trimmed absolute pressure sensitivity in LSB/kPa

UserOffset = The 16-bit signed value programmed into the P_CAL_ZERO register

Note: The pressure calibration registers enable range and resolution options beyond the

specified values of the device. The user must take care to ensure that the value stored in

this register does not result in a compressed output range or a railed output.

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