NXP Semiconductors

MPL3115A2S

I2C precision pressure sensor with altimetry

Bit

Symbol

Description

1 — A new set of data is ready

2

PDR [2]

New pressure/altitude data available. PDR is set to 1 whenever a new pressure/altitude

data acquisition is completed. PDR is cleared anytime OUT_P_MSB register is read, when

F_MODE is zero. PDR is cleared by reading F_DATA register when F_MODE > 0.

0 — No new pressure/altitude data is available (reset value)

1 — A new set of pressure/altitude data is ready

1

TDR [3]

New temperature data available. TDR is set to 1 whenever a temperature data acquisition

is completed. TDR is cleared anytime OUT_T_MSB register is read, when F_MODE is zero.

TDR is cleared by reading F_DATA register when F_MODE > 0.

0 — No new temperature data ready (reset value)

1 — A new temperature data is ready

0

reserved

This bit is reserved

Table 15. DR_STATUS - status register (address 06h) bit description...continued

[1]

PTDR and PTOW flag generation requires the DREM event flag generator to be enabled in the PT data configuration register (PT_DATA_CFG).

[2]

PDR and POW flag generation is required for the pressure/altitude event flag generator to be enabled (PDEFE = 1) in the PT data configuration register

(PT_DATA_CFG).

[3]

TDR and TOW flag generation is required for the temperature event flag generator to be enabled (TDEFE = 1) in the PT data configuration register (PT_

DATA_CFG).

14.2.1 Data registers with F_MODE = 00 (FIFO disabled)

When the FIFO data output register, F_DATA (0Eh), is disabled (F_MODE[7:6] = 00 in the F_SETUP register,

0Fh), the pressure and altitude data registers indicate the real-time status information of the sample data. This

data can be either altimeter or barometer data based on the mode defined by the ALT bit in the CTRL_REG1

register. See Section 14.8 "FIFO setup registers" for additional information.

14.3 OUT_P_MSB, OUT_P_CSB, OUT_P_LSB - pressure and altitude data registers

(address 01h, 02h, 03h)

Pressure and altitude data registers 01h, 02h, and 03h comprise the pressure and altitude data depending on

the setting of the ALT bit in the CTRL_REG1 register, in either altimeter or barometer mode. For example if the

ALT bit is set (ALT = 1) then after acquisition the data stored in registers 01h, 02h, and 03h is the altitude in

meters. Otherwise the data stored in registers 01h, 02h, and 03h (ALT = 0) is pressure data in Pascals.

The altitude data is stored as a 20-bit signed integer with a fractional part. The OUT_P_MSB (01h) and

OUT_P_CSB (02h) registers contain the integer part in meters and the OUT_P_LSB (03h) register contains the

fractional part. This value is represented as a Q16.4 fixed-point format where there are 16 integer bits (including

the signed bit) and four fractional bits.

The pressure data is stored as a 20-bit unsigned integer with a fractional part. The OUT_P_MSB (01h),

OUT_P_CSB (02h), and bits 7 to 6 of the OUT_P_LSB (03h) registers contain the integer part in Pascals. Bits 5

to 4 of OUT_P_LSB contain the fractional component. This value is representative as a Q18.2 fixed-point format

where there are 18 integer bits and two fractional bits.

MPL3115A2S

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Product data sheet

Rev. 1.4 — 8 May 2023

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