MMA8451 datasheet(24/47 Pages) FREESCALE

24 / 47 page

MMA8452Q

Sensors

Freescale Semiconductor, Inc.

0x11: Portrait/Landscape Configuration Register

This register enables the Portrait/Landscape function and sets the behavior of the debounce counter.

0x12: Portrait/Landscape Debounce Counter

This register sets the debounce count for the orientation state transition. The minimum debounce latency is determined by the

data rate set by the product of the selected system ODR and PL_COUNT registers. Any transition from WAKE to SLEEP or vice

versa resets the internal Landscape/Portrait debounce counter. Note: The debounce counter weighting (time step) changes

based on the ODR and the Oversampling mode. Table 22 explains the time step value for all sample rates and all Oversampling

modes.

0x13: PL_BF_ZCOMP Back/Front and Z Compensation Register

The Z-Lock angle compensation is set to 29°. The Back to Front trip angle is set to ±75°.

Note: All angles are accurate to ±2°.

0x11: PL_CFG Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DBCNTM

PL_EN

Table 20. PL_CFG Description

DBCNTM

Debounce counter mode selection. Default value: 1

0: Decrements debounce whenever condition of interest is no longer valid.

1: Clears counter whenever condition of interest is no longer valid.

PL_EN

Portrait/Landscape Detection Enable. Default value: 0

0: Portrait/Landscape Detection is Disabled.

1: Portrait/Landscape Detection is Enabled.

0x12: PL_COUNT Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DBNCE[7]

DBNCE[6]

DBNCE[5]

DBNCE[4]

DBNCE[3]

DBNCE[2]

DBNCE[1]

DBNCE[0]

Table 21. PL_COUNT Description

DBCNE[7:0]

Debounce Count value. Default value: 0000_0000.

Table 22. PL_COUNT Relationship with the ODR

ODR (Hz)

Max Time Range (s)

Time Step (ms)

Normal

LPLN

HighRes

Normal

LPLN

HighRes

800

0.319

1.25

400

0.638

2.5

200

1.28

0.638

1.28

2.5

100

2.55

0.638

2.55

2.5

5.1

0.638

5.1

2.5

12.5

5.1

20.4

0.638

20.4

2.5

6.25

5.1

20.4

0.638

40.8

2.5

160

1.56

5.1

20.4

0.638

40.8

2.5

160

0x13: PL_BF_ZCOMP Register (Read Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BKFR[1]

BKFR[0]

ZLOCK[2]

ZLOCK[1]

ZLOCK[0]

Table 23. PL_BF_ZCOMP Description

BKFR[1:0]

Back Front Trip Angle Fixed Threshold = 01 which is

≥ ±75°.

ZLOCK[2:0]

Z-Lock Angle Fixed Threshold = 100 which is 29°.

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