MPL3115A2ST1 datasheet(29/49 Pages) NXP

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NXP Semiconductors

MPL3115A2S

I2C precision pressure sensor with altimetry

Bit

Symbol

Description

7 to 3

reserved

These bits are reserved

DREM

Data ready event mode.

0 — Event detection disabled (reset value) If the DREM bit is cleared logic '0' and one or

more of the data ready event flags are enabled, then an event flag will be raised whenever

the system acquires a new set of data.

1 — Generate data ready event flag on new pressure/altitude or temperature data. If the

DREM bit is set logic '1' and one or more of the data ready event flags (PDEFE, TDEFE) are

enabled, then an event flag will be raised upon change in state of the data.

PDEFE

Data event flag enable on new pressure/altitude

0 — Event detection disabled (reset value)

1 — Raise event flag on new pressure/altitude data

TDEFE

Data event flag enable on new temperature data.

0 — Event detection disabled (reset value)

1 — Raise event flag on new temperature data

Table 34. PT_DATA_CFG - sensor data register (address13h) bit description

14.13 BAR_IN_MSB, BAR_IN_LSB - barometric pressure input register (address 14h,

15h)

Barometric input for altitude calculations. Input is equivalent to sea level pressure for measurement location.

Value is input in 2 Pa units.

Units are input as unsigned 16-bit integers. The default value is 101,326 Pa. The default value can be changed

by writing to this register.

Location

Bit

Address Register

14h

BAR_IN_MSB

BAR[15:8]

15h

BAR_IN_LSB

BAR[7:0]

Reset MSB

Reset LSB

Access

R/W

Table 35. BAR_IN_MSB, BAR_IN_LSB - barometric pressure input register (address 14h, 15h) bit allocation

14.14 P_TGT_MSB, P_TGT_LSB - pressure/altitude target value register (address 16h,

17h)

Altitude or pressure target value.

Depending on the setting of the ALT bit in the CTRL_REG1 register, it operates in either altimeter or barometer

mode. This value works in conjunction with the window value (P_WND_MSB and P_WND_LSB). In altitude

mode, the register value is 16-bit signed integer in meters.

In pressure mode, the value is a 16-bit unsigned value in 2 Pa units.

MPL3115A2S

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

Product data sheet

Rev. 1.4 — 8 May 2023

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