MPL3115A2

Sensors

Freescale Semiconductor, Inc.

33

Note: RAW bit overrides the ALT mode and writes uncompensated Pressure and Temperature data

7.17.2 CTRL_REG2 (0x27)

OS[2:0]

RAW

RAW output mode. RAW bit will output ADC data with no post processing, except for oversampling. No scaling or offsets will be

applied in the digital domain. The FIFO must be disabled and all other functionality: Alarms, Deltas, and other interrupts are

disabled.

ALT

Altimeter-Barometer mode.

Default value: 0

1: Part is in Altimeter Mode

0: Part is in Barometer mode

Table 59. System Output Sample Rate Selection

OS2

OS1

OS0

Oversample

Ratio

Minimum Time

Between

Data Samples

0001

6 ms

0012

10 ms

0104

18 ms

0118

34 ms

1

0

0

16

66 ms

1

0

1

32

130 ms

1

1

0

64

258 ms

1

1

1

128

512 ms

Table 60. CTRL_REG2 Register

7

6543

21

0

R0

0

LOAD_OUTP

UT

ALARM_SEL

ST[3]

ST[2]

ST[1]

ST[0]

W

Reset

0

0000

00

0

Table 61. CTRL_REG2 Bit Descriptions

Name

Description

ST[3:0]

Auto acquisition time step.

Default value: 0

ALARM_SEL

The bit selects the Target value for SRC_PW/SRC_TW and SRC_PTH/SRC_TTH

Default value: 0

0: The values in P_TGT_MSB, P_TGT_LSB and T_TGT are used (Default)

1: The values in OUT_P/OUT_T are used for calculating the interrupts SRC_PW/SRC_TW and SRC_PTH/SRC_TTH.

LOAD_OUTPUT

This is to load the target values for SRC_PW/SRC_TW and SRC_PTH/SRC_TTH.

Default value: 0

0: Do not load OUT_P/OUT_T as target values

1: The next values of OUT_P/OUT_T are used to set the target values for the interrupts.

Note:

1. This bit must be set at least once if ALARM_SEL=1

2. To reload the next OUT_P/OUT_T as the target values clear and set again.

Table 58. CTRL_REG1 Bit Descriptions