MMA8652FC datasheet(47/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.9.5

0x18 FF_MT_COUNT Debounce register

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

The Debounce register sets the minimum number of debounce sample counts that continuously match the detection condition

selected by you 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. The time step used for the debounce sample count depends on

the ODR chosen and the Oversampling mode, as shown in Table 39.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Figure 39. 0x18 FF_MT_COUNT register (Read/Write)

Table 38. FF_MT_COUNT register

Bit(s)

Field

Description

7–0

D[7:0]

Count value

0000_0000 (default)

Table 39. 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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