MPL3115A2ST1 datasheet(22/49 Pages) NXP

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NXP Semiconductors

MPL3115A2S

I2C precision pressure sensor with altimetry

Location

Bit

Address Register

01h

OUT_P_MSB

PD[19:12]

02h

OUT_P_CSB

PD[11:4]

03h

OUT_P_LSB

PD[3:0]

reserved

Reset

Access

Table 16. OUT_P_MSB, OUT_P_CSB, OUT_P_LSB - pressure and altitude data registers (address 01h, 02h, 03h) bit

allocation

14.3.1 Data registers with F_MODE = 00

The DR_STATUS, OUT_P_MSB, OUT_P_CSB, OUT_P_LSB, OUT_T_MSB, and OUT_T_LSB registers are

stored in the auto-incrementing address range of 00h to 05h. This allows the host controller to read the status

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

14.4 OUT_T_MSB, OUT_T_LSB - temperature data registers (address 04h, 05h)

The temperature data is stored as a signed 12-bit integer with a fractional part. The OUT_T_MSB (04h) register

contains the integer part in °C and the OUT_T_LSB (05h) register contains the fractional part. This value is

representative as a Q8.4 fixed-point format where there are eight integer bits (including the signed bit) and four

fractional bits.

Location

Bit

Address Register

04h

OUT_T_MSB

TD[11:4]

05h

OUT_T_LSB

TD[3:0]

reserved

Reset

Access

Table 17. OUT_T_MSB, OUT_T_LSB - temperature data registers (address 04h, 05h) bit allocation

14.5 OUT_P_DELTA_MSB, OUT_P_DELTA_CSB, OUT_P_DELTA_LSB - pressure and

altitude delta register (address 07h, 08h, 09h)

The pressure and altitude delta registers 07h, 08h, and 09h comprise the pressure and altitude delta data and

provide the differences from either the last pressure or altitude samples based on the setting of the ALT bit in

the CTRL_REG1 register. Device can be in either altimeter or barometer mode.

The altitude data is arranged as a 20-bit signed integer with a fractional part. Stored as meters with the 16 bits

of OUT_P_DELTA_MSB and OUT_P_DELTA_CSB and with fractions of a meter stored in 4 bits in position 7 to

4 of OUT_P_DELTA_LSB.

The pressure is arranged as a 20-bit unsigned integer with a fractional part in Pascals. The first 18 bits are

located in OUT_P_DELTA_MSB, OUT_P_DELTA_CSB, and bits 7 to 6 of OUT_P_DELTA_LSB. The two bits in

position 5 to 4 of OUT_P_DELTA_LSB represent the fractional component.

Note: The OUT_P_DELTA register store the difference data information regardless of the state of the FIFO

data output register driver bit, F_MODE > 00.

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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