MPL3115A2 Xtrinsic Smart Pressure Sensor

Freescale's Xtrinsic MPL3115A2 provides highly precise pressure and altitude data with variable sampling rate capability. It has very low-power consumption, smart features and requires zero data processing for mobile devices, medical and security applications.

The Xtrinsic MPL3115A2 pressure sensor smart features include digital output, two interrupts for auto-wake, minimum/maximum threshold detection and autonomous data acquisition. MCU usage can be limited since the MPL3115A2 pressure sensor can process sensor data locally, reducing communications required with the host processor.

Features

  • Less than 1 foot / 0.3 m resolution
  • Pressure range: 20 - 110 kPa
  • Compensated, direct reading (software is not needed)
  • 20-bit pressure measurement (Pascals)
  • 20-bit altitude measurement (meters)
  • 12-bit temperature measurement
  • On-board intelligence
  • Flexible sampling rate up to 128 Hz

I2Cdevlib Device Source and Documentation

Example Code

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I2C Data Capture Dumps

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Register Map

 R/WBit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
[0x00] STATUS

Sensor Status (STATUS @ 0x00)

The aliases allow the STATUS register to be read easily before reading the current Pressure/Altitude or Temperature data, delta Pressure/Altitude or Temperature data or FIFO data using register address auto-incrementing mechanism.

RO 
[0x01] OUT_P_MSB

Pressure Data Out MSB (OUT_P_MSB @ 0x01)

Register Bitfields

  • [23:4] OUT_P - Pressure Data
RO[23:4] OUT_P

OUT_P_MSB @ 0x01

Pressure Data (OUT_P [23:4])

 
[0x02] OUT_P_CSB

Pressure Data Out CSB (OUT_P_CSB @ 0x02)

RO
[0x03] OUT_P_LSB

Pressure Data Out LSB (OUT_P_LSB @ 0x03)

RO
[0x04] OUT_T_MSB

Temperature Data Out MSB (OUT_T_MSB @ 0x04)

Register Bitfields

  • [15:4] OUT_T - Temperature Data
RO[15:4] OUT_T

OUT_T_MSB @ 0x04

Temperature Data (OUT_T [15:4])

 
[0x05] OUT_T_LSB

Temperature Data Out LSB (OUT_T_LSB @ 0x05)

RO
[0x06] DR_STATUS

Sensor Status (DR_STATUS @ 0x06)

RO 
[0x07] OUT_P_DELTA_MSB

Pressure Data Out Delta MSB (OUT_P_DELTA_MSB @ 0x07)

Register Bitfields

  • [23:4] OUT_P_DELTA - Pressure Data Delta
RO[23:4] OUT_P_DELTA

OUT_P_DELTA_MSB @ 0x07

Pressure Data Delta (OUT_P_DELTA [23:4])

 
[0x08] OUT_P_DELTA_CSB

Pressure Data Out Delta CSB (OUT_P_DELTA_CSB @ 0x08)

RO
[0x09] OUT_P_DELTA_LSB

Pressure Data Out Delta LSB (OUT_P_DELTA_LSB @ 0x09)

RO
[0x0A] OUT_T_DELTA_MSB

Temperature Data Out Delta MSB (OUT_T_DELTA_MSB @ 0x0A)

Register Bitfields

  • [15:4] OUT_T_DELTA - Temperature Data Delta
RO[15:4] OUT_T_DELTA

OUT_T_DELTA_MSB @ 0x0A

Temperature Data Delta (OUT_T_DELTA [15:4])

 
[0x0B] OUT_T_DELTA_LSB

Temperature Data Out Delta LSB (OUT_T_DELTA_LSB @ 0x0B)

RO
[0x0C] WHO_AM_I

Device Identification (WHO_AM_I @ 0x0C)

RO 
[0x0D] F_STATUS

FIFO Status (F_STATUS @ 0x0D)

RO 
[0x0E] F_DATA

FIFO 8-bit Data Access (F_DATA @ 0x0E)

RO 
[0x0F] F_SETUP

FIFO Setup (F_SETUP @ 0x0F)

R/W 
[0x10] TIME_DLY

Time Delay (TIME_DLY @ 0x10)

RO 
[0x11] SYSMOD

System Mode (SYSMOD @ 0x11)

RO 
[0x12] INT_SOURCE

Interrupt Source (INT_SOURCE @ 0x12)

RO 
[0x13] PT_DATA_CFG

PT Data Configuration (PT_DATA_CFG @ 0x13)

R/W 
[0x14] BAR_IN_MSB

BAR Input in MSB (BAR_IN_MSB @ 0x14)

R/W 
[0x15] BAR_IN_LSB

BAR Input in LSB (BAR_IN_LSB @ 0x15)

R/W 
[0x16] P_TGT_MSB

Pressure Target MSB (P_TGT_MSB @ 0x16)

R/W 
[0x17] P_TGT_LSB

Pressure Target LSB (P_TGT_LSB @ 0x17)

R/W 
[0x18] T_TGT

Temperature Target (T_TGT @ 0x18)

R/W 
[0x19] P_WND_MSB

Pressure/Altitude Window MSB (P_WND_MSB @ 0x19)

R/W 
[0x1A] P_WND_LSB

Pressure/Altitude Window LSB (P_WND_LSB @ 0x1A)

R/W 
[0x1B] T_WND

Temperature Window (T_WND @ 0x1B)

R/W 
[0x1C] P_MIN_MSB

Minimum Pressure Data Out MSB (P_MIN_MSB @ 0x1C)

R/W 
[0x1D] P_MIN_CSB

Minimum Pressure Data Out CSB (P_MIN_CSB @ 0x1D)

R/W 
[0x1E] P_MIN_LSB

Minimum Pressure Data Out LSB (P_MIN_LSB @ 0x1E)

R/W 
[0x1F] T_MIN_MSB

Minimum Temperature Data Out MSB (T_MIN_MSB @ 0x1F)

R/W 
[0x20] T_MIN_LSB

Minimum Temperature Data Out LSB (T_MIN_LSB @ 0x20)

R/W 
[0x21] P_MAX_MSB

Maximum Pressure Data Out MSB (P_MAX_MSB @ 0x21)

R/W 
[0x22] P_MAX_CSB

Maximum Pressure Data Out CSB (P_MAX_CSB @ 0x22)

R/W 
[0x23] P_MAX_LSB

Maximum Pressure Data Out LSB (P_MAX_LSB @ 0x23)

R/W 
[0x24] T_MAX_MSB

Maximum Temperature Data Out MSB (T_MAX_MSB @ 0x24)

R/W 
[0x25] T_MAX_LSB

Maximum Temperature Data Out LSB (T_MAX_LSB @ 0x25)

R/W 
[0x26] CTRL_REG1

Control Register 1 (CTRL_REG1 @ 0x26)

R/W 
[0x27] CTRL_REG2

Control Register 2 (CTRL_REG2 @ 0x27)

R/W 
[0x28] CTRL_REG3

Control Register 3 (CTRL_REG3 @ 0x28)

R/W 
[0x29] CTRL_REG4

Control Register 4 (CTRL_REG4 @ 0x29)

R/W 
[0x2A] CTRL_REG5

Control Register 5 (CTRL_REG5 @ 0x2A)

R/W 
[0x2B] OFF_P

Pressure Data User Offset (OFF_P @ 0x2B)

R/W 
[0x2C] OFF_T

Temperature Data User Offset (OFF_T @ 0x2C)

R/W 
[0x2D] OFF_H

Altitude Data User Offset (OFF_H @ 0x2D)

R/W