MMA8451Q datasheet(33/52 Pages) FREESCALE

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MMA8451Q

Sensors

Freescale Semiconductor, Inc.

0x18: FF_MT_COUNT Debounce Register

This register sets the number of debounce sample counts for the event trigger.

This register sets the minimum number of debounce sample counts of continuously matching the detection condition user

selected for the freefall, motion event.

When the internal debounce counter reaches the FF_MT_COUNT value a Freefall/Motion event flag is set. The debounce

counter will never increase beyond the FF_MT_COUNT value. Time step used for the debounce sample count depends on the

ODR chosen and the Oversampling mode as shown in Table 38.

0x18: FF_MT_COUNT_Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 37. FF_MT_COUNT Description

D[7:0]

Count value. Default value: 0000_0000

Table 38. FF_MT_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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