MMA8653FC datasheet(37/56 Pages) FREESCALE

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MMA8653FC

Sensors

Freescale Semiconductor, Inc.

6.6.5

0x18: FF_MT_COUNT, Debounce Register

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

Figure 35. 0x18 FF_MT_COUNT, Debounce Register (Read/Write)

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 28, “FF_MT_COUNT Relationship with the ODR".

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 27. FF_MT_COUNT register

Field

Description

D[7:0]

Count value. Default value: 0000_0000

Table 28. 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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