MPL3115A2

Sensors

Freescale Semiconductor, Inc.

37

The system’s interrupt controller uses the corresponding bit field in the CTRL_REG5 register to determine the routing table for

the INT1 and INT2 interrupt pins. If the bit value is logic ‘0’ the functional block’s interrupt is routed to INT2, and if the bit value is

one or more functional blocks can assert an interrupt pin simultaneously; therefore a host application responding to an interrupt

should read the INT_SOURCE register to determine the appropriate sources of the interrupt.

Figure 9. INT1/INT2 PIN Control Logic

7.18

Offset Correction

The 2’s complement offset correction registers values are used to trim the temperature, altitude and pressure offsets that might

occur over the life of the product.

The resolution of the pressure offset register is 4 Pa per bit.

7.18.1 OFF_P (0x2B)

Pressure user accessible offset trim value expressed as an 8-bit 2's complement number. The user offset registers may be

adjusted to enhance accuracy and optimize the system performance. Range is from -512 to +508 Pa, 4 Pa per LSB.

7.18.2 OFF_T (0x2C)

Temperature user accessible offset trim value expressed as an 8-bit 2's complement number. The user offset registers may

be adjusted to enhance accuracy and optimize the system performance. Range is from -8 to +7.9375

C, 0.0625C per LSB.

Table 68. OFF_P Register

7

65432

10

R

OFF_P7

OFF_P6

OFF_P5

OFF_P4

OFF_P3

OFF_P2

OFF_P1

OFF_P0

W

Reset

0

00000

00

Table 69. OFF_P Description

Name

Description

OFF_P7-OFF_P0

Pressure offset trim value.

Default value: 0000_0000.

Table 70. OFF_T Register

7

6

5

43

210

R

OFF_T7

OFF_T6

OFF_T5

OFF_T4

OFF_T3

OFF_T2

OFF_T1

OFF_T0

W

Reset

0

0

0

00

000

OR

SRC DR

SRC Pressure Change

SRC Temp Change

.

.

.

INT