MMA8652FC datasheet(40/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.8.3

0x12 Portrait/Landscape Debounce register

The Portrait/Landscape Debounce register sets the debounce count for the orientation state transition. The minimum debounce

latency is determined by the data rate (which is set by the product of the selected system ODR and PL_COUNT registers). Any

transition from WAKE to SLEEP (or SLEEP to Wake) resets the internal Landscape/Portrait debounce counter.

NOTE

The debounce counter weighting (time step) changes, based on the ODR and the

Oversampling mode. Table 28 explains the time step value for all sample rates and all

Oversampling modes.

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]

Figure 32. 0x12 PL_COUNT register (Read/Write)

Table 27. PL_COUNT register

Bit(s)

Field

Description

7–0

DBCNE[7:0]

Debounce Count value

0000_0000 (default)

Table 28. 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

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